A kind of starch adhesive for wood based on pre-emulsification technology and preparation method thereof
A starch adhesive and pre-emulsification technology, applied in the direction of adhesive, adhesive type, graft polymer adhesive, etc., can solve the problems of high cost, affecting the continuity of the preparation process, unfavorable simplification of the process, etc., to achieve stable reaction, Save manpower and improve drying speed
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Embodiment 1
[0031] Formula (mass percentage):
[0032]
[0033] Process flow:
[0034] (1) Use cassava starch as raw material, prepare starch milk with a mass concentration of 30g / 100g, acidify it with hydrochloric acid at 60°C for 1 hour, then adjust the pH to about 3.5-4.5 with sodium hydroxide, add urea, and heat up to 90°C , and keep warm for 0.5h, then cool down to 65°C;
[0035] (2) Under the condition of 35°C, gradually drop the monomer into the pre-dissolved sodium lauryl sulfate solution and stir. 55-60min until a uniform and stable monomer emulsion is formed;
[0036] (3) Add the total amount of 60% initiator in the reaction bottle, slowly drop the pre-emulsified monomer emulsion, the time for dropping is 3.5h, and add 10% initiator of the total amount every hour during this period;
[0037] (4) After the monomer is added dropwise, continue to keep warm for 1h, then raise the temperature to 75°C, keep warm for 0.5h, cool down to 50°C, add dimethyl phthalate, sodium benzoat...
Embodiment 2
[0040] Formula (mass percentage):
[0041]
[0042] Process flow: Make waxy corn starch into 20% starch milk based on starch dry basis, add hydrochloric acid at 65°C for 1.5 hours, and at the same time, pre-emulsify in monomer pre-emulsification tank. Put the pre-dissolved and dispersed emulsifier solution into the tank at ℃, stir, and gradually add the monomer dropwise. The monomer dropping time is 60 minutes, the stirrer speed is 250-350r / min, and the stirring time is 70 minutes until a uniform and stable emulsifier is formed. After the acid hydrolysis of starch is completed, adjust the pH to about 4 with sodium hydroxide, then add diluent urea, heat up to 95°C, then cool down to 70°C, and add 70% of the total amount to the reaction bottle Slowly add the pre-emulsified monomer emulsion dropwise, the dropping time is 3h, add 10% total amount of initiator every hour during this period, after the reaction, continue to keep warm for 0.5h, heat up to 80°C, keep warm 1h, cool ...
Embodiment 3
[0045] This example gives a comparison of the main properties of the starch adhesive for wood prepared by the traditional process and the starch adhesive for wood prepared by the optimized new process
[0046] Formula (mass percentage):
[0047]
[0048] Method 1 (without pre-gelatinization and pre-emulsification, the subsequent gelatinization temperature is 85°C, and urea is added after the grafting reaction): make corn starch into starch milk with 40% starch dry basis, add hydrochloric acid at 55°C Under acid hydrolysis for 1.5h, adjust the pH to 4 with sodium hydroxide solution, raise the temperature to 70°C, add 60% initiator potassium persulfate and all emulsifier cetyltrimethylammonium bromide, slowly drop grafting Monomer vinyl acetate, after about 3 hours, the monomer is added dropwise, add the remaining potassium persulfate, react for 1 hour, heat up to 85°C, gelatinize for 30 minutes, cool down to 50°C, add urea, polyethylene glycol, benzoic acid and normal Butan...
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