It's very cold. Add some chemicals to the white latex to make it dry faster.

White latex is a thermoplastic adhesive obtained by emulsion polymerization of vinyl acetate. Widely used in wood processing, wood-based panels, cement mortar, paper, cloth, leather, ceramics and other industries bonding. It has the advantages of convenient use, strong adhesion and simple production process. However, its viscosity is unstable, especially at low temperature in winter, which often leads to gelation due to the increase of viscosity. It can only be used after heating, which not only brings a lot of inconvenience to winter construction, but also affects the bonding quality. Therefore, the storage conditions are generally required to be above 10℃. In view of this shortcoming, researchers at home and abroad actively develop white latex without gelation at low temperature to solve the problems of storage and construction in winter. The antifreeze white latex introduced below can reduce the gelation temperature to 2℃. (1) raw materials 1. Vinyl acetate (CH3COOCH=CH2), abbreviated as vinyl acetate, is a colorless flammable liquid with strong fragrance. Its vapor is irritating to eyes, and its relative density is 0.93 12 (20℃). The boiling point is 72 ~ 73℃. Insoluble in water, soluble in most organic solvents, and polymerizable with other monomers. Here is the polymerization monomer of polyvinyl acetate, which is an industrial product. Manufacturers: Beijing Organic Chemical Plant, Second Branch of Shanghai Petrochemical Complex, Sichuan Vinylon Chemical Plant, Lanzhou Vinylon Factory, Fujian Vinylon Factory, Shijiazhuang Vinylon Factory, Siping United Chemical Plant in Jilin Province, and Guizhou Organic Chemical Plant. 2. Polyvinyl formal is a resin condensed from polyvinyl alcohol and formaldehyde. Its raw material ratio is as follows: polyvinyl alcohol 100, formaldehyde 40, water 960- 1040, hydrochloric acid (10%)10.4-10.2, sodium hydroxide (sodium hydroxide). It is used as a modifier for white latex. 3. The chemical name of emulsifier OP-10 [C8h17c6H4o (CH2O)10h] is octyl (or non-alkyl) phenol polyoxyethylene (10) ether. The appearance is yellow or brown paste, the relative density is 1.06, and the freezing point is 7.2℃. The aqueous solution is soluble in water, is a transparent liquid, and can also be dissolved in carbon tetrachloride, lower alcohols and most aromatic solvents. Acid and alkali resistance. Here as an emulsifying dispersant. Choose industrial products. Manufacturer: Guangzhou Auxiliary Chemical Factory. 4. Potassium persulfate (K2S2O8) is white, fine or large, with a relative density of 2.477. It decomposes above 100℃ and releases oxygen to become potassium pyrosulfate. Soluble in water, insoluble in ethanol, with strong oxidation. Here as a polymerization initiator. Choose industrial products. Manufacturers: Tianjin Dongfang Chemical Plant, Sichuan Chongqing Jialing Chemical Plant, etc. 5. sodium bicarbonate (NaHCO3) is also called sodium bicarbonate or acidic sodium carbonate. Commonly known as baking soda, baking soda or soda. White monoclinic crystal. The relative density is 2.20. In hot air, a part of carbon dioxide can be lost slowly, and when heated to 270℃, all carbon dioxide can be lost. It is an important and commonly used drug. This is used to adjust the pH value. Choose industrial products. 6. Dibutyl phthalate is a colorless and transparent oily liquid, which is flammable and has an aromatic smell. Relative density 1.045, boiling point 340℃, insoluble in water, soluble in organic solvents such as ethanol and ether. As a plasticizer, it can significantly reduce the film-forming temperature of polymers. Choose industrial products. Manufacturers: Harbin No.4 Chemical Plant, Shanghai Solvent Factory, Tianjin Solvent Factory, Jinan Hongwei Chemical Plant, Guangdong Boiling Mountain Solvent Factory, Yunnan Xuanwei Solvent Factory, Hengyang Solvent Factory, etc. (2) Compilation method 1. Formula (by weight): vinyl acetate 160 10% polyvinyl formal 180 emulsifier OP- 102 water 30 potassium persulfate 0.4 sodium bicarbonate 0.6 dibutyl phthalate 202. Operation The prepared polyvinyl formal was added into a condenser with reflux. Then vinyl acetate accounting for 65438 05% of the total amount and initiator (potassium persulfate) accounting for 40% of the total amount were added. When the temperature rises to 66℃, reflux occurs. The reflux speed is controlled by the temperature. After the reflux basically disappears, the temperature is raised to about 80℃, and vinyl acetate is continuously dropped at the rate of 65438 00% of the total amount of vinyl acetate per hour, and potassium persulfate solution is added at the rate of 4-5% of the total amount of initiator per hour. Control the addition of vinyl acetate in about 8 hours, then add the remaining initiator, raise the temperature to 90 ~ 95℃, and keep the temperature for half an hour. Finally, cooling to below 50℃, adding prepared 10% sodium bicarbonate aqueous solution and dibutyl phthalate, stirring evenly, and discharging. (3) The appearance of product quality index is milky white, free of particles and foreign bodies, with pH value of 4-5, viscosity (centipoise, 30℃) of 5 150, solid content (%) of 46-50 and ash (%) of less than 0.15, and the film-forming property can be made into colorless and transparent continuous films. After bonding, it was left for a period of time, and then pressed at a pressure of 3 ~ 5 kg/cm2 for 3 hours. At this time, the strength can reach about 70 ~ 80% of the adhesive strength. Complete curing takes 8 ~ 16 hours. If heating curing is adopted, the curing time can be shortened. Generally, it is cured by heating at about 80℃ under the pressure of 3 ~ 5 kg/cm2. The thin plate only needs to be pressed for a few minutes, and the thick plate needs to be stretched properly. It's very cold. Add some chemicals to the white latex to make it dry faster. Legend Ten Years Collection Account Registration