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.

www.zscnr.com 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.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.

www.zscnr.com has marched into the stage of rapid development. Confronting to the domestic competition of adhesive, the company takes slow and steady efforts to catch up and now it has created a well-known brand among the domestic adhesive industry. The whole company will tenaciously strive to enter into the top 100 of the domestic adhesive industry.

This article is come from:http://www.game-dice.net/some-knowledge-about-led-smd-adhesive/

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.

www.zscnr.com provides 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 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/some-knowledge-about-smt-red-adhesive.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.

www.zscnr.com is a professional enterprise that engaged in the technology development, production and distribution of electronic adhesive. The price of our products is competitive and the quality is the top-class. Welcome to visit our page for more details!

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%.

www.zscnr.com is a professional enterprise that engaged in the technology development, production and distribution of electronic adhesive. The price of our products is competitive and the quality is the top-class. Welcome to visit our page for more details!

This article is come from: http://www.industrialmachinery4u.com/competitive-engineering-adhesive-sealant-industry-in-china.htm

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.

www.zscnr.com

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

Green Revolution of Packaging - DN-90 Quick-Drying Starch Adhesive

Confusing SMT Adhesives Market

With the development of market economy, China's small and medium-sized cardboard box factory is everywhere, due to the relevant departments for a long time is not clearly sodium silicate binder materials, cannot be used on the domestic packaging carton, the carton standard adhesives do not clearly defined. Currently, it is popular on the market a "the carton treasure", "starch glue, its prices are less than ideal performance, cause confusion to the market, allowing users to select glue caused psychological barriers, for many small carton factory crude the easy way, so the use is more than 100 years of traditional products sodium silicate carton adhesive material, not knowing that there are many drawbacks to do with sodium silicate binder, experts called to reiterate carton production should be eliminated sodium silicate, and requires a Starch smt adhesive.

Drawbacks of the Sodium Silicate Adhesive

Sodium silicate is an aqueous solution of sodium silicate, is a strong base, weak acid salt, showed a strong alkaline, the free base is 6% to 7%. The sodium silicate is able to penetrate the carton surface, corrosion contents, does not meet the packaging requirements of food hygiene, and foreign trade. In a humid environment, the sodium silicate absorbent deliquescence, loss of adhesion, carton paper softened and deliquescence efflorescence, affecting printed effect help cartons appearance. As we all know, the use of sodium silicate, as an adhesive material cartons is hygroscopic, toxic, endangering human health and ecological environment seriously affect the quality of packaging products and merchandise sales, our packaging solved cut key issues, the paper and packaging industry tilted the period of waiting for a new generation of adhesives speedy advent! Developed capitalist countries in the 1950s are out of the sodium silicate in 1984, China began to limit and prohibit the use of sodium silicate in the export and food packaging.

New Multi-functional Starch Adhesive

In May 1991, the State Economic and Trade Commission, Bureau of Technical Supervision, the Ministry of Foreign Trade again noticed "disabled since 1992 all packaging plant sodium silicate adhesive material". But what suffers is that unable to find a substitute. And some foreigners even ridiculed: Chinese have the first class products, but the packaging is not inflow, such as the Heat Sink Paste. Especially in the current paper packaging industry trends, all require the use of green packaging, so as to protect the environment, and in particular the accession to the WTO will be higher on the packaging requirements of environmental protection. There should be a new generation of patented products in order to meet the requirements of the times and the binder demand and trends, so the DN-90 series multi-functional starch adhesives came into being, it is a new type of solid powder adhesive material as the main raw material.

This article is come from: http://www.power-supplier.info/digital-screen/green-revolution-of-packaging-dn-90-quick-drying-starch-adhesive.htm

Thermal Heat Sink Paste Information

Features of Heat Sink Paste

Heat sink paste is made of Polysiloxane and the high thermal conductive filler, featuring non-toxic, tasteless and non-corrosive. Its chemical and physical properties are stable with excellent electrical insulation and excellent thermal conductivity. Heat sink paste like smt adhesive is resistant to high and low temperature with the temperature range of -600℃ to 250℃. After long-term working it will not be air-dried, hardening or melting. It is mainly used to fill the gap between the heating body and heat sink, improving the cooling effect.

Detailed Information on Heat Sink Paste

Heat sink paste is often called thermal grease, but actually should be named silicon paste for it is made of silicone oil. The silicone oil is a kind of polysiloxane. From a structural point of view, heat sink paste is a long chain consisting of a lot of silane with thousand to millions of molecular. They feature excellent heat resistance, electrical insulation, thermal conductivity, damping, and its viscosity is not sensitive to temperature. Their chemical property is stable, less volatile, non-toxic and tasteless. The silicon paste filler is the very fine powder through grinding with zinc oxide / alumina / boron nitride / silicon carbide / aluminum as their ingredients. Silicone oil ensures a certain amount of mobility, and fillers help fill the tiny gap between the CPU and heat sink to ensure thermal conductivity. Due to low sensitivity of silicone oil to temperature sensitivity, it won’t become thick under low temperature or become diluted under high temperature, and it features non-volatile, so available to be used for a long time. How to transfer heat between heat the heat sink and CPU? Well it mainly relies on conducting method – directly connecting the heat sink paste and CPU. The purpose of using the thermal grease is to fill the gap between them, making the connection perfect. If the grease is used in excess, there would form a grease layer between the CPU and heat sink, so the cooling path turns out to be CPU --- grease --- heat sink.

Notes When Using Heat Sink Paste
Some high-grade thermal grease uses the silver powder or aluminum powder as its filler, for these metals have high thermal conductivity. But metal particles have big sizes with poor filling effects, so the performance of heat sink paste cannot be improved greatly. Even though grease features electric conductivity, short circuit would lead if not use appropriately.

This article is come from: http://cell.battery-products.com/heat-sink-paste/thermal-heat-sink-paste-information.htm