Insights on the research, development, and production of white latex

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A quiet adhesive expert who is engaged in research, development, and production of white latex in Guangzhou. Next, I would like to share with you my experiences in the research, development, and production of white latex over the past year. Raw material section: (1) Crosslinking monomer: DAP, a crosslinking monomer whose scientific name is dipropyl phthalate. The price is 32 yuan per Kg. The best results are achieved with a combination of hot and cold methods. Cold addition means adding it at the end, just like dibutyl ester, and the film immediately becomes flexible and elastic. The addition amount is 0.2%; 0.1% when added at high temperature, 0.1% when added at low temperature, 0.1% when added at high temperature. (2) Emulsifier WZ-100, from Shiseido, Japan. It has amazing effects when used to prepare styrene-acrylic emulsions. The addition amount is one thousandth. The toluene solution of OT-75 emulsified rosin also has a special effect. (3) Initiator: Butyl peroxide – a highly effective initiator that enables the monomer conversion rate to exceed 99% easily. The emulsion reaction has a wider temperature range. To be used in conjunction with sculpting putty. The dosage is similar to that of ammonium. 0.5% of the monomer (calculated based on a 100% purity of tert-butyl hydroperoxide); the common concentration of tert-butyl hydroperoxide is 70%, so the amount used is 0.7% of the monomer amount. The amount of sodium hypochlorite used is half that of tert-butyl hydroperoxide. Few people use this kind of initiator, and those who do must understand its advantages. Ammonium peroxide + sodium bisulfite. Increase the monomer conversion rate to broaden the temperature range for the emulsion reaction. It’s used by quite a lot of people, so I won’t go into details. The initiator is also key to the reaction, as many specialty adhesives are made using different initiators. But many people overlook this and focus solely on improving the product in other aspects. Generally, once an adhesive is applied to the hand and melted with the fingers, it’s possible to figure out what type of initiator was used to make it. The initiator is also key to reactions at low temperatures or even at room temperature. There are also some minor additives such as methanol, anhydrous ethanol, and dodecanethiol. These are widely used, so I won’t go into further detail. For polyvinyl alcohol, stop stirring at 75 degrees during cooling; packaging and discharging at 50 degrees can help save costs. The control of the intermediate temperature (for example, our factory can maintain it at 82 degrees plus or minus 0.5 degrees), as well as the method of adding the monomer (such as non-traditional seed-free emulsion polymerization), can all have an impact on the properties of the adhesive. In short, to produce high-quality white glue, it is just as important to improve the formula and production process as it is to use raw materials that others cannot utilize. Making the glue high-density can also improve its performance. This is a viewpoint that not many people are familiar with. It has a high density, so customers can use glue more quickly. The more \"solid components\" there are in a given volume, the greater its strength will be. To achieve a high density for the glue, in addition to it being related to the initiator, this can also be addressed by applying vacuum later on or by using pressure to remove the material. Vacuuming later, along with discharging under pressure, can also speed up the discharge process and improve work efficiency. Although the density is only slightly higher, the improvements in performance and other aspects are by far more significant. The glue theory is very important! ! This can be used to design various formulations, such as the HLB theory for emulsifiers, structural index determination, glass transition temperature optimization, solid content adjustment, viscosity control, as well as the determination of addition rates and timing. With these, formulas can basically be designed for production applications. Basically, all the adhesives commonly found on the market can be addressed using these theories. Issues such as sealing glue, paper-plastic adhesive, and PVC glue can all be resolved. The glue theory is also not very important! ! Companies like ours can produce products with excellent quality and appearance by using high amounts of initiators, low amounts of emulsifiers, or even no emulsifiers at all. There is also the glue for combined carbonization mentioned on this forum; during production, the stirrer can be seen very clearly. Recently I came across a starch-based white latex with a solid content of 30%; it had a strong starch smell as soon as I smelled it. The starch content is estimated to be around 10%. However, the film is very transparent, even more so than the white latex produced by many manufacturers, and it has strong initial adhesion. Its price is only 4 yuan per kg. It also has high viscosity, resulting in excellent adhesion when used to attach wood veneer to medium-density fiberboard. There is also a polyvinyl formaldehyde adhesive. The viscosity is extremely high, at 2 million Mpas, yet it can still be poured out of the bucket. Amazingly, this glue can be pulled like the ramen made by a ramen master without breaking. . The price is 5 yuan per kg, and the glue can be left out at room temperature for several months without losing its effectiveness. The world of adhesives is full of talented individuals. Only a genius can turn ordinary glue into something extraordinary. Regarding the divine being, I can only bow in worship. I would like to share some of these insights with everyone; I hope the experts will not find it amusing.