The Characteristics of the SMT Adhesive

SMT adhesive refers to the hardening agents, pigments, solvents, etc. of the adhesive are evenly distributed in the red paste, which is mainly used to fix the component on the printed board, and generally it is assigned by the use of point coating. Smt adhesive adhesive should have the following characteristics: 1. Connection strength: adhesive patch must have a strong connecting strength, and after it being hardened, even at the solder melting temperature is not peeled. 2. Dispensing: the allocation of the printed circuit board to use more dispensing, thus requiring plastic patch has the following properties: A. the mount technology B. it is easy to set the supply amount of each component C. simple adaptation replacement parts varieties D. dispensing amount of stability



3. adapt to the high-speed machine: we must meet the feature of high-speed dispensing and high-speed of mounter, specific, high-speed dispensing without drawing Furthermore, high-speed mount, the printed circuit board in the process of transmission , the plastic patch viscous to ensure that the components do not move. 4. No drawing, no slump: Once the patch glue stick on the pad, components cannot be achieved with the electrical connection of the printed circuit board, adhesive sealant coating, no drawing and no slump avoid pollution pad. 5. Low temperature curing: curing, with wave soldering and welding well does not have to go through the reflow furnace heat-resistant cartridge components, so they requested that the hardening conditions must meet the low-temperature, short time. 6. Adjustment: reflow soldering, pre-coating process, the plastic patch is cured first before the solder is melted, the fixed component, it will hinder the components sank solder and self-adjustment. Therefore, the plastic patch should have a certain degree of self-adjustment.

There is no doubt that we should spare more time in the study of the technology of SMT adhesive to take more share of the market and capture the trend of market. And try our best to reduce the cost of the raw material.

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This article is come from:http://www.game-dice.net/the-characteristics-of-the-smt-adhesive/

Some Knowledge about LED SMD Adhesive

The function of LED SMD Glue

For wave soldering and reflow soldering surface mount plastic (LED SMD gum, SMA, surface mount adhesives), mainly used components will be fixed in the printed circuit board, general dispensing or stencil printing method to allocate to maintain the position of the components on the printed circuit board (PCB), to ensure that the components are not lost in the transfer process on the assembly line. Paste components into the oven or reflow welder heating hardening. It is not the same, so-called solder paste by heating and curing, re-heating is also not melt, which means that the thermal hardening process of the adhesive patch is irreversible. Smt adhesive effect will be due to the heat curing conditions, linkers, differ depending on the equipment used, the operating environment. We select the patch glue according to the production process.

The ingredients of LED SMD adhesive

Most surface mount plastic used in the PCB assembly (SMA) is epoxy resins (epoxies), although there are polypropylene (acrylics) is for the special uses. After the introduction of high-speed dispensing system and electronics industries learn how to deal with relatively short shelf life products, epoxy resin has become the worldwide more mainstream glue technology. Epoxy generally provide good adhesion on a wide range of circuit board and has a very good electrical properties. The main ingredients are: a base body material (i.e. a high molecular material), fillers, curing agents and other additives.



The intension of LED SMD adhesive

1. Adhesive sealant prevents the components of falling off in the wave soldering. (Wave soldering process) 2. Prevent another surface component off in the process of reflow (double-sided reflow process) 3. Prevent displacement of components (reflow process, pre-coating process) 4. Marking (wave soldering, reflow, pre-coated), when the volume of the printed circuit board and components change, plastic patch can mark. The classification of use of LED SMD adhesive 1. Dispensing type: dispensing equipment sizing in the printed circuit board. 2. Squeegee type: steel mesh or copper network printing scratch coating way sizing.

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Some Knowledge about SMT Red Adhesive

The process SMT red glue

First, Printing: Stencil engraved hole according to the type of part, the performance of the substrate to determine its thickness and the size and shape of the hole. The advantage of smt adhesive is speed, high efficiency. Second, Dispensing: Dispensing is the use of compressed air, the red plastic glue through a dedicated point head points to the substrate, the size of the gel-point, how much, by the time the pressure tube diameter and other parameters to control, dispenser with flexible function. For different parts, we can use different dispensing head, set the parameter to change, you can also change the shape and number of glue points, in order to achieve the desired effect, and the advantage is convenience, flexibility, stability. The disadvantage is that easy drawing and bubble. Operating parameters, speed, time, pressure, temperature adjustment, we can minimize these shortcomings. Third, needle turn, a special needle membrane immersed in a shallow plastic tray each needle with a glue dot will be out of the needle, when the gel-point contacting with the substrate, the amount of glue by needle shape and diameter to change. The curing temperature of 100 °C to 120 ° C to 150 °C the curing time of 5 minutes to 150 seconds 60 seconds. Typical curing conditions: Note: 1, the higher the curing temperature and the curing time is longer, the adhesive strength, the stronger. 2, the temperature of the plastic patch will change with the different parts of the substrate size and placement position, so we propose to identify the most suitable curing conditions. Red plastic storage: can be stored at room temperature for 7 days, less than 5 ℃ storage is greater than in June, can store more than 30 days at 5 ~ 25 ℃.



SMT patch red plastic management

SMT patch red plastic is affected by its viscosity, flow and wetting properties temperature, so SMT patch red plastic should have certain conditions of use and specification management. First, red plastic should have the specific serial numbers, and should be numbered according to the number of feed, date and type. Second, red plastic should be stored in 2 ~ 8 ℃ in the refrigerator to prevent the change in the characteristics of adhesive sealant due to temperature changes. Third, for the dispensing, hose red plastic needs defoaming and the unused disposable red plastic should be put it in the refrigerator and the old plastic cannot be mixed with new plastic. Fourth, we should accurately fill out the temperature records table, back to the temperature and the return temperature of the time, users need to confirm the temperature before use. Typically, the expired red plastic cannot be used.

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This article is come from:http://www.soundspeakers.cn/index.php/some-knowledge-about-smt-red-adhesive.htm

Some Features of the Adhesive Sealant

The stability of the adhesive sealant

The stability adhesive emulsion is related to color fastness. Emulsion particles should be controlled in the 0.2μm, and its particle size distribution should be uniform, and there are not both the big particles and small particles, or the friction fastness will be reduced, and the method to determine the quality of adhesive sealant is to observe the appearance of the emulsion, and the particles in the white emulsion illustrate are larger, which are at least 5 μm or more, the emulsion with the described yellow particles is very uneven, generally the particles are at least more than 2μm, and the emulsion with blue particles is around 1μm, and the ideal adhesive should be blue translucent emulsion, which is not milky, indicating the size of the particles are in the 0.2-1μm, and the particle size distribution range is narrow.



Improve the adhesive rubbing fastness

The rubbing fastness of pigment printing is the most troublesome. In the used printing paste, some factories add organic silicon, but the effect was not significant. Some people think that this is caused by the uneven coating particle size, it was also considered to be caused by the adhesive, use polyurethane adhesive rubbing fastness of the same coating can be qualified and unqualified acrylate adhesive, and the use of different matching adhesive its situation is different. Of course, the coating particles bring some affects, when the particle diameter is large, and the crystal form and particle size distribution uneven course rubbing fastness will reduce, but under the same circumstances in the coatings, Heat Sink Paste play a decisive role. The main factors affecting rubbing fastness is the coefficient of friction of the coating, and the rich than a low content of the smoothness of the film to its friction with high fastness, and the fastness of polyacrylate adhesive with the high content of the soft monomer is poorer than the one with less content.

Three ways to solve the rubbing fastness

The aids increasing friction fastness are added in the paste, which is a silicone elastomer, or an oxidized polyethylene emulsion, the amount is greater than 5%, less ineffective, its purpose is added the substance with the smoothing effect to the film. It can be used together with the polyurethane adhesive to improve the performance of the film by the polyurethane. The new copolymer which is made of acrylate and silicone monomer is the existing product.

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Flame retardant RTV silicone, yellow glue, white glue thermal conductive silicone (silicon) , thermal silicon grease (thermal paste), SMT placement glue, the screw glue, LED module potting glue, circuit board 3 –resisting glue, fast drying, two-component sealing glue, epoxy AB glue, lead-free solder paste, lead-free reducing slag, lead-free disposable flux and other electronic industrial adhesives and dispensing equipments.

This article is come from:http://www.metal-tinbox.com/index.php/some-features-of-the-adhesive-sealant.htm

Sealant Application in the Automobile Industry

Common Car Adhesive Sealant

Adhesive sealant is also known as liquid gasket seal (such as steel pad, pad of paper, etc.). Compared with solid, it is easy to use, has good sealing performance and advantages, it is widely used in the automotive industry. Common automotive sealant glass has glue BETASEAL. It can be used to bond the windshield and rear window of the car, so that it can stick into one solid body. The use of glass, plastic completely abandon the traditional glass installed backward means making the glass supporting work is easy to operate and the degree of automation has greatly improved. Another glass glue sealant has good strength and wealth to the elastic compressive seismic performance; sealant BETAGVARD. The PVC matrix auto paint sealant is divided into the colorable and non-colorable two kinds. Its main role is to maintain the sealing of the entire body, cut off from the outside moisture, dust and smoke. In addition, such an adhesive sealant has the function of anti-corrosion, sound insulation as well as beautification of the car models. BETAGVARD colorable sealant can be used in low temperature and high temperature baking process, brushing in sealed externally is visible and the gap itself is not contaminated with dried topcoat.



Automotive Adhesive Sealing Material Yet to be Developed

Currently, the domestic auto smt adhesive material has certain gap with foreign countries, as showed from the following aspects: First, the limited variety of adhesive sealant raw materials, many of them are substitutes or imported products, prices are high, lack of market competitiveness. The level of industrial technology of China's car industry in the use of adhesive sealing material, production scale, and the degree of product serialization is relatively backward, and it hinders the rapid development of technology. Not yet have the authoritative professional organization, it is difficult to draft the constitution, norms, standards, or exchange with foreign countries.

Adhesive Sealant in Window Glass

Since the single-component polyurethane adhesive is a moisture-reactive adhesive sealant, its construction and curing has special demands on the environment, usually the temperature of 18 to 40 °C, and the relative humidity is 55% to 65% will be appropriate. The temperature and humidity is too low, will reduce the adhesive curing reaction speed; while when the high temperature and humidity, curing reaction rate is fast, bubbles occur and reduce the adhesive strength and sealing effect. The single-component polyurethane adhesive sealant is usually used in conjunction with supporting cleaner, glass bottom glue and paint bottom glue to improve the adhesive strength and anti-aging properties. Various bottom gums are not only with single-component polyurethane adhesive between solid combination, and it should also have good adhesion with the sticky surface, because it plays a role as a bridge between the adherends sealant.

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This article is come from:http://www.industrialmachinery4u.com/sealant-application-in-the-automobile-industry.htm

Competitive Engineering Adhesive Sealant Industry in China

China Engineering Adhesive Industry

Engineering adhesives are mainly used in transportation, electronic appliances, optical instruments, building materials, auto mechanics, aerospace, new energy, medical and other fields. It can be classified into reaction type acrylic acid ester type, anaerobic, CN-based acrylic ester type, epoxy type, silicone, and (no solvent) polyurethane adhesives in accordance with the characteristics of the different types of adhesives and the downstream demands. China's engineering adhesives get rapid development. In the "Twelfth Five Year" period, we are focused on the development of environmentally friendly energy-saving, high-value-added type adhesive. The "12th Five-Year Plan" on the adhesive part of the proposed phase-out limit inferior and solvent-based neoprene type, styrene-butadiene thermoplastic PU and PMMA universal product development; accelerate the MMA-Et copolymer emulsion, high peel strength ring oxygen and other high-end products, research and development; focus on the development of environmental protection and energy saving, as well as other high-performance, high-quality, high-value-added adhesive sealant.



Engineering Adhesive Types and Application Range

Engineering smt adhesive can be divided into reaction type acrylic acid ester type, anaerobic, epoxy type, silicone, and polyurethane adhesive sealant according to the characteristics of different types of adhesives and the downstream needs, The adhesive is mainly used in transportation, electronic appliances, optical instruments, building materials, auto mechanics, aerospace, new energy, medical and other fields. The support adhesives industry in the development of new industries is accompanied by the development of solar energy, wind energy, aerospace, new energy vehicles and high-speed rail, rail transit and other emerging industries, the future of wind power with polyurethane epoxy structural adhesive, solar cell sealing glue, plastic packaging peritoneal adhesive, automotive structural adhesive, water treatment, and ultrafiltration membrane water purification equipment end-capped gum will usher in rapid development.

Broad Prospects of Engineering Adhesives Industry

With the strong support of the new national industrial policy as well as the "Twelfth Five-Year Plan", China's engineering adhesives industry develops rapidly. Improvement of the quality of domestic products gradually replace imported products; gradually optimize the industrial structure, the value-added products has been significantly improved, especially for new energy, automotive, LED, electronics, construction, health care, and aerospace and other fields adhesive products development. China in the future will focus on the development of silicone, epoxy glue, and polyurethane glue, part of the engineering adhesives production growth will exceed 15%.

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How to Determine the Quality of Adhesive?

A sufficient adhesive strength

Firstly, the adhesives must have a sufficient adhesive strength to ensure that the bonding does not affect the function of the paper products. We have to judge whether the adhesive bonding strength is qualified, then tear the two sticky material along the adhesive sealant interface, if it is found that the sticky material was torn destroyed, the bonding strength is sufficient; while if the bonding interface is just separated which indicates that adhesives intensity is insufficient. The adhesives with poor performance will appear the phenomenon of unglued and film crisp after it has been stored in high or low temperature for a period of time, so it is necessary to make the high-temperature thermal change and low temperature embrittlement experiments to determine whether its quality is reliable. The test method of high-temperature is to put the tray with the completely cured thermal bonding part in a oven with 60 ° C temperature to be baked for 24 hours, and after cooling, flap the tray junction until their separation, if the stick material is torn, which indicates that the heat resistance of the adhesive is excellent, if they are sticky material intact, just the bonding interface is disengaged, indicating the high heat resistance; low temperature embrittlement test is to put the cured tray in the -15 ℃ environment completely to be frozen for 24 hours, and the determination method is the same with high temperature thermal deformation test method.



Drying rate of the adhesive sealant

When purchasing the adhesives, such as smt adhesive, we must measure whether the drying rate matches with the bonding process. The general manual bonding process is slower, which requires a longer initial dry time; while the speed of the machine bonding process is quick, requiring short early dry time. The vast majority of cases require the shortest dry time, in order to proceed to the next step as soon as possible.

Viscosity of the adhesive sealant

The viscosity is the most important factor affecting adhesives quality. If the viscosity is too large, then the coating is thicker, the glue consumption is larger and dried capacity is slower, but also affect the surface wetting and penetration on the adherend, which in turn directly affect the adhesive strength; if the viscosity is too small and the coating layer is thinner, the excessive drying is prone to issues such as adhesion failure. Packaging enterprises must make the viscosity testing from time to time to ensure its adhesion strength in the ideal range. The desired viscosity range of Various adhesives is not the same, such as corrugated board line binder is 50 ± 15 seconds, automatic Laminator glue of 50 ± 10 seconds, manual laminating glue of 70 ± 15 seconds, sticky box with glue.

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We provide the following electronic adhesives and technology service: Flame retardant RTV silicone, yellow glue, white glue thermal conductive silicone (silicon), thermal silicon grease (thermal paste), SMT placement glue, the screw glue, LED module potting glue, circuit board 3 –resisting glue, fast drying, two-component sealing glue, epoxy AB glue, lead-free solder paste, lead-free reducing slag, lead-free disposable flux and other electronic industrial adhesives and dispensing equipments.

This article is come from: http://www.soundspeakers.cn/index.php/how-to-determine-the-quality-of-adhesive.htm

The Development Trend of Pigment Printing Binding Agent

Requirements on pigment printing adhesive

In order to solve the core issues of the feel, color fastness and environment of pigment printing, the environmentally friendly printing binder is synthesized. Heat Sink Paste must meet the following requirements: the formed film is colorless and transparent and it will not become yellow after heating. The nature of the film is sturdy with good elasticity, adhesion, washable and dry cleaning and resistant to the sun and aging; film-forming is soft, feel good and not tacky after the treatment of fabric. The color fastness of printing fabric is not less than the dye printing standards.



The important role of heat sink paste

Pigment printing process is simple, saves energy, with chromatography and no wastewater discharge. Mixed colors and spline are convenient, printing outline is clear, genuine rate is high, reproducibility is strong and general light fastness is good. In recent years, many new materials can be used in pigment printing process, especially with the development of synthetic fiber and blended fabric, the superiority and the importance of the pigment printing are more prominent. Today's global pigment printing takes the average share of the total printing market share of 45% and it takes the largest proportion of all printing. Among them, ratio of upholstery fabrics is 38%. However, pigment printing printed fabric has low rubbing fastness and it will release odor in the operating environment. Although countries in the world have spared no effort to improve and develop new coatings for many years and make great progress in their supporting new additives, such as adhesive sealant, it is difficult to get the overall balance in feel, fastness, seepage, environmental protection and other aspects.

Development and status quo of the pigment printing binder

In the 1950s, the rapid rise in petrochemical and polymer science has spawned a wide variety of synthetic polymer binder. As the shortcomings of complex traditional dyeing process, various rejects, high cost and long processing cycle, foreign countries put forward pigment dyeing and printing. From the direction of development to improve the fastness, improve feel, and reduce energy consumption, foreign adhesives mainly have gone through four stages: the first generation of adhesives is not cross-linked polymer film-forming substances. The second generation was added -CN,-OH,-NH2,-COOH reactive group; the third generation was added self-crosslinking monomer in the binder component in order to improve fastness, reduce curing temperature and shorten the baking time. The fourth-generation printing binder - low-crosslinking binder appeared soon. The crosslinking molecular structure has a strong reactive group, and can react with the hydroxyl group or an amino group at 100 degrees Celsius and can improve the deposition, but also greatly save energy. China also made a lot of research in improving the adhesive application performance and exploring new synthesis process.

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Knowledge of Adhesive Sealant

Classification of Adhesive Sealant

Classification of adhesives many ways, it is not unified, commonly there are: according to chemical composition: This is a more scientific method of classification, it will be the adhesive divided into organic adhesives and inorganic adhesives. Organic adhesives are divided into synthetic adhesives and natural adhesives. Synthetic adhesive resin types have rubber type, complex type; natural adhesives such as animals, plants, minerals, natural rubber adhesive. Inorganic adhesive is divided by chemical components such as phosphates, silicates, sulfates, borates variety: Liquid adhesive and solid adhesives can be divided into morphological classification. A solution type, emulsion type, paste, film, tape, powder, granule, glue sticks. Uses: This can be divided into three main categories of structural adhesives, non-structural adhesive sealant and specialty adhesive sealant. Application methods: room temperature curing, heatset, hot melt, pressure-sensitive, and then wet-bonding agents.

Development Trend of the Adhesive Sealant

Now the non-solvent adhesive develops rapidly. The many adhesives contain a large number of highly volatile solvents, and these solvents not only endanger the physical and mental health of the people and the destruction of the ozone layer in the atmosphere. In recent years, causing the public and government attach great importance, so natural to the adhesives industry brought a new development trend, namely solvent-free adhesives development. Nano-adhesives will be the star of a dazzling new technology. Namely develops in the direction of multifunction adhesive. When a thermal paste substitute with a variety of functions at the same time when its value is often steep, so the multifunctional adhesive is one of the trends of industrial adhesives. Development of the military, defense adhesives is necessary. Development of military, defense adhesives for future war and counter-terrorism, counter-terrorism needs, so it must have developed by leaps and bounds.

Adhesives in Industrial Applications

Adhesive technology in addition to a simple, fast, efficient, inexpensive features and it can also be used to bond some other connection cannot connect or structure, such as metal and non-metal bonding, to overcome the cast iron, aluminum welding fissile and aluminum cannot be cast iron, steel welding. And can in some cases effectively replaced by welding, riveting, threaded connection, and other mechanical connections. At present, the application of the adhesive has been infiltrated into all sectors of the national economy, to become an indispensable technology in industrial production, a wide range of applications in high-tech fields, according to reports: Foreign production car to use 5 ~ 10kg adhesive; a Boeing aircraft bonding area of 2400m2; an aerospace aircraft need bonding 30000 ceramic pieces.

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