Formula and technology of the hottest white emulsi

2022-08-22
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White latex formula and process

1 Use this agent is a white emulsion made of vinyl acetate, polyvinyl alcohol, dibutyl phthalate, octanol, ammonium persulfate, etc. as raw materials to increase the area of the oil suction port at the inlet of the oil suction pipe. It is widely used for the bonding of wood, plywood, cement mortar, paper, cloth, leather, etc. it is convenient to use, has strong adhesion, and the production process is relatively simple. The disadvantage is poor performance at low temperature. 2. Raw material (1) vinyl acetate: also known as vinyl acetate, referred to as vinyl acetate, colorless flammable liquid. It has a strong fragrance. Its vapor is irritating to eyes. Insoluble in water, soluble in most organic solvents. It is used to make vinyl ester and synthetic fiber. It is also used for making rubber, paint, adhesive, etc. Used as adhesive in this agent. (2) Polyvinyl alcohol: a high molecular compound formed by saponification of polyvinyl acetate. White or cream powder. Thermoplastic. Depending on the degree of saponification, the product can be dissolved in water or only swell. It is mainly used as raw material of polyvinyl acetal resin, as well as adhesive and dispersant. This agent is used as a bonding agent. Select industrial products. (3) Dibutyl phthalate: colorless liquid. Insoluble in water, soluble in ethanol, ether and other organic solvents. It is a plasticizer for making plastics, synthetic rubber, artificial leather, etc. It is also the solvent and curing agent of spices. Used as plasticizer in this agent. Select industrial products. Here refers to 2-ethylhexanol-1. Colorless liquid with special smell. Soluble in water, ethanol, ether and other organic solvents. This agent is used as a solvent. Select industrial products. (5) Ammonium persulfate: colorless monoclinic crystal. Sometimes light green, soluble in water. When heated, it decomposes and has strong oxidizability. Used as bleach, oxidant, deodorizer, etc. This agent is used as polymerization initiator. Select industrial products. 3. Formula (weight%) vinyl acetate 45 polyvinyl alcohol 5 dibutyl phthalate 4 octanol 1 ammonium persulfate 0.1 water 44.94 Preparation method (1) dibutyl phthalate is mixed with octanol according to the formula, and stirred to dissolve it. (2) Add water into the container, heat it to 70 ℃, add polyvinyl alcohol under stirring, heat it to 90 ℃, and keep it warm until it is completely dissolved. After dissolution, stop heating to reduce the temperature to 66 ~ 69 ℃, and add vinyl acetate under stirring. (3) Add the solution prepared in step (1) to the solution prepared in step (2), finally add ammonium persulfate, stir and mix evenly, and conduct lotion polymerization at 66 ~ 69 ℃ to obtain white emulsion. 5. The use method depends on the bonding object. You can use the original solution directly or dilute it appropriately. When diluting, first raise the temperature of lotion to 30 ~ 40 ℃, and then slowly add distilled water at 30 ~ 40 ℃, and do not dilute it with cold water. The amount of water added should be equivalent to 20 ~ 30% of the original solution. If too much water is added, the emulsifying property will be damaged, which will lead to the failure of four ball machines. Starch paste should be added to thicken after dilution. When gluing wood, it is generally to apply glue on two bonding surfaces, and it should be left in the air for a while after gluing. Generally, when the amount of glue is 100 grams per square meter, let it dry for 5 minutes; When the amount of glue is 150 grams per square meter, dry for 10 minutes; When the amount of glue is 200 grams per square meter, let it stand for 20 minutes, then paste it, let it stand for 20 minutes, and then use 0 The pressure of 294 ~ 0.490 MPA can be pressed for more than 3 hours. It takes 8 ~ 16 hours to cure completely. The method of heating and curing can also be adopted. Generally, when the glue is applied and dried until it does not adhere, press it at 80 ℃ with a pressure of 0.294 ~ 0.490 MPa. The thin plate only needs to be pressed for a few minutes, and the pressing time of thick plate should be appropriately extended

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