The Impact Factors of Electronic Adhesive

The electronic glue viscosity is an important performance indicator, such as the high demand of the bare chip (COB) technology to the glue cured heap and potting glue long plastic rheology requirements are the Heat Sink Paste degree requirements.


Generally, the electronic adhesive with the higher viscosity has relativly large molecular mass with good heat resistance and the initial adhesion strength is high. The products with high viscosity and low solid help to reduce the cost of product. However, in practical applications, the high viscosity of the electronic adhesive will often lead to mutual dissolution of the components in the production process more difficult, so that the rheology of the glue is poor.

Factors affecting the viscosity of the electronic glue

First, it is convenient for filler in regulating electronic adhesive degree. After choosing the filler according to the performance need, you can adjust the viscosity of the adhesive through the appropriate choice of particle size and mass fraction, to meet the construction process.

Second, the system viscosity obtained from the different types of the prepolymer is different, and in the precondition of satisfing the basic performance, we can make the appropriate choice of the prepolymer based on the needs of the electronic adhesive degrees with the thermal paste substitute, and by adjusting the mass fraction of the prepolymer, to meet the viscosity of the system and optimum performance requirements. Since the adjustment of the system viscosity is not very clear wehn the prepolymer mass fraction is more than 50%, therefore, in order to reduce costs, the mass fraction of the prepolymer generally will not exceed 50%.

Third, a coupling agent has the amphiphilic structure, which can improve the dispersion state of the inorganic powder in the matrix, in order to improve the rheology of the system, and an amount of 2% of the coupling agent is more appropriate.

Fourth, stirring allows system mixing, uniformity of performance, and we should choose the appropriate stirring rate and mixing time, in order to meet the desired physical properties.

Fifth, adhesive curing process is actually the process of e-adhesive degree change, and the mass fraction of the curing agent affects adhesive gel point balance from the system to the time (valid), so the amount of curing agent should be appropriate. We should keep these points in mind to make the better research in the electronic glue to take more shares in the market.

Thanks to the seven-year arduous pioneering, 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.

Notes for the Selection of Adhesives Sealant

The necessity of selecting starch adhesives

It would better choose starch adhesives to take the place of the synthetic resin adhesives which will benefit the cost savings. Starch adhesive owns the features of fast drying, strong bonding, environmental pollution, low cost and other fine features. In laminating, the ordinary carton adhesive, paper tube adhesive and paper pallets bonding, starch adhesive sealant can completely replace the synthetic resin adhesives.

The advantages of hot melt adhesives

In variety of adhesives, the drying time of hot melt adhesive is the shortest, for the adhesive molding process which needs instant drying and curing, and then it is advisable to use hot melt adhesive. Hot melt adhesive is ideal for bonding process between the plastic foam or EPE materials and paper, dry quickly, and the adhesive is very strong. We should note that the Heat Sink Paste has the most extensive range of application, but not for the adhesion of UV varnish paper products.

Different adhesives for different work

Due to the practices are different, the performance of the adhesives must also be different. Such as laminating process, the speed of the automatic laminating machine is fast, thus requiring lower viscosity adhesives and quick drying; while manual laminating machine is slow, thus requiring slightly fast of adhesive viscosity and drying speed should not be too fast.


The storage period of adhesive

The storage period should also be taken into consideration range when purchasing the adhesives. Storage period refers to under specified conditions adhesives stored, to stable performance maintain time. Purchases should be based on the enterprise's production situation to make sure the adhesives minimum storage period. For general corporate, the adhesives shelf life should be more than a month.


Adhesives for the different purposes of products

Usually the paper container requires only a sufficient adhesive strength in storage during the transport, while for the packaging of food, cosmetics and pharmaceuticals, except the adhesive strength requirements, and also requires the adhesives used must be odorless, non-toxic, in line with national health and safety regulations and environmental requirements. Certain ingredients, such as adhesive promoting agents, plasticizers, antioxidants, etc. may be transferred to the inner surface of the packaging material and contamination of food, which must be limited. In addition, it should be based on the specific use of paper products, adhesives various patience visits, such as heat resistance, water resistance, chemical resistance, aging resistance, low temperature resistance.



The security of adhesives

Environmental protection and safety are also the factors to be considered for adhesives. The solvent-based adhesives use large amounts of organic solvent, which not only serious pollute environment, but also damage to human health, and may cause a fire, and therefore should be possible to find a water-based or solvent-free adhesives.



www.zscnr.com

Thanks to the seven-year arduous pioneering, Conor 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.



The article is come from:http://www.chinawoodenflooring.com/index.php/notes-for-the-selection-of-adhesives-sealant.htm


More about my article, you also can read:http://industrialaterials.blog.fc2.com

Development Trend of Adhesive Sealant

The status quo of the adhesive sealant industry

In today's world, the times call for green living and pursue environmental protection, and therefore environmental conservation is not only an important symbol of social progress, but also an important condition for the survival of mankind. For the adhesives industry, it is imperative to research and develop the applied environmental adhesives. The birth of environmentally friendly adhesives destines to change people's lives and living environment. Environmentally friendly adhesive sealant plays an important role in computer technology, communication technology, electronic products and electrical distribution progress, so that the product has better sealing, which saves from the damage of a high-sensitive circuits, microprocessors and the environmentally friendly characteristics of semiconductor which contains no environmental pollutants determines the facilitate recycling of electronic equipment, which is more harmony with the human living environment. Environmentally friendly adhesives keep furniture from daily wear and scratches which make it have the feature of waterproof and new look. Because the performance and flexibility of the softening the product surface. The home environment constructed by it will be more comfortable and closer to nature. The environmentally friendly adhesives are to help create higher work efficiency prosperity office and a clean and comfortable living environment.



How to improve the heat resistance of the sealant?
First, increase the degree of cross linking. Second, add the silane coupling agent. Third, take the use of a resin or rubber with good high temperature performance, such as phenolic resins, silicone resins, fluorine-containing rubber and heterocyclic polymers to increase the degree of crystallinity of the polymer appropriately. Fourth, add antioxidants in the smt adhesive, such as gallic propyl gallate, 8 - hydroxyquinoline. Fifth, add the heat-resistant filler, such as asbestos powder, aluminum powder, etc. Sixth, take use of good curing agents with high temperature resistance, such as epoxy adhesive and diamino diphenyl sulfone.

Measures to keep the safety of adhesives
The following measures should be taken to ensure safety: First of all, we should be aware of the toxicity and danger in adhesives. We should put on work clothes and wear a mask and gloves in the process of operation. In addition, the bonding workplace should be well-ventilated and timely discharge poison gas to keep the air fresh; and the toxic substances should be controlled within the specified limits. Minimize direct contact with people with gum. Smoking, eating and fire are forbidden in the bonding site. Electrical equipment and lighting fixtures should be explosion-proofed, including fire apparatus to prepare a number of emergency medicine. Weighing, mixing with glue should be carried out in a well-ventilated place or isolated operation to reduce poison. If the glue gets on your hands or skin, you can wipe with acetone, and try to avoid using solvents to wash their hands, prevent skim from chapping. You’d better wash your hands with warm water and soap.

www.zscnr.com
Thanks to the seven-year arduous pioneering, Conor 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.

The article is come from:http://www.chinawoodenflooring.com/index.php/development-trend-of-adhesive-sealant.htm

Safe, Effective, Eco-Friendly Adhesives Sealants for Green House Planning

The Dangers of Conventional Adhesives Sealants

Everyone’s getting into the DIY approach when it comes to sustainable house projects, unfortunately, many of the chemicals used in building products simply are not regulated at all. They don’t have to be tested for environmental safety or health, and if there are only tiny amounts, companies don’t have to list them at all even if the chemicals are toxic and can bioaccumulate.

Volatile Organic Compounds (VOCs) are one of the problems with conventional adhesive sealant. They evaporate into the air at room temperature and can contribute to indoor air pollution, global warming, destruction of the ozone layer and compromised health in the form of lung damage, breathing disorders and cancer. The odour can be sickening and can also be flammable. The binding agents used in some products are highly synthetic and can be very toxic. Keep an eye out for formaldehyde-releasing binders such as Urea-formaldehyde (the worst), Melamine-formaldehyde (less bad), and Phenol-formaldehyde (least bad). Other binders to avoid include di-isocyanate and water solvable polyvinyl acetate (PVA).



How to Find Environmentally Safe Alternatives to Conventional Sealants Adhesives
One place to start in terms of finding eco-friendly smt adhesive is to choose products that have some kind of green certification or label. There are many programs that do this, and you should become familiar with the following labels. Some of these green labeling programs also apply to many other products such as furniture, carpeting, and paints. In addition to the green certifications, when searching for nontoxic versions of these products, look for the following features: Non-toxic, non-solvent, solvent-free, acid-free, water-based, water-soluble, low VOC (less than 1%), no-VOC, and/or no animal derivatives (if that is something you’re concerned about).

Additionally, some adhesives use powerful solvents to liquefy the resin that acts as the bonding agent. Although solvents definitely are the way out of common use due to their toxicity, they still show up in many products. Solvent-based adhesives should be treated as hazardous waste and avoided whenever possible.

Some of these green labeling programs also apply to many other products such as furniture, carpeting, and paints. In addition to the green certifications, when searching for nontoxic versions of these products, look for the following features: Non-toxic, non-solvent, solvent-free, acid-free, water-based, water-soluble, low VOC (less than 1%), no-VOC, and/or no animal derivatives (if that is something you’re concerned about).

The article is come from:http/www.chinahotelsupply.com.cn/index.php/safe-effective-eco-friendly-adhesives-sealants-for-green-house-planning.htm