Preparation method of polyvinyl acetate woodworking adhesive with long open time

A polyvinyl acetate and vinyl acetate technology, applied in the direction of monocarboxylate copolymer adhesive, adhesive type, etc., can solve the problems of insufficient bonding strength and insufficient opening time of the glue, and achieve The effect of extending the opening hours

Active Publication Date: 2017-11-17
顶立新材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the drying process, the traditional adhesives evaporate too quickly because of the fast water, that is, the opening time of the glue is not long enough. As a result, when the workers apply pressure after coating the multi-layer board, the glue is already dry and the ideal bonding strength cannot be achieved.

Method used

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  • Preparation method of polyvinyl acetate woodworking adhesive with long open time

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one total amount=1000kg

[0015] (1) 1 kilogram of ammonium persulfate is dissolved in 50 kilograms of water, obtains the ammonium persulfate initiator solution of polymerization;

[0016] (2) 210 kilograms of vinyl acetate, 50 kilograms of hydroxyethyl methacrylate, and 3 kilograms of diacetone acrylamide are mixed and stirred evenly to make 263 kilograms of mixed monomers;

[0017] (3) Add 634 kg of water, 1 kg of defoamer F681, 1 kg of buffer sodium bicarbonate, 3 kg of emulsifier Co436 into the reaction kettle, add 10 kg of PVA2488 and 10 kg of PVA1788 under the condition of dispersing and stirring, stir and disperse for 10 minutes Then heat up to 85°C to dissolve for 50 minutes, then cool down to 50°C, add 20 kg of vinyl acetate and 15 kg of ammonium persulfate solution, stir and disperse for 10 minutes;

[0018] (4) Raise the temperature to 72°C, keep warm for 15 minutes until there is no reflux, and add 263 kg of mixed monomers in step (2) dropwise wi...

Embodiment 2

[0019] Embodiment two total amount=1000kg

[0020] (1) 2 kilograms of ammonium persulfate are dissolved in 50 kilograms of water, obtain the ammonium persulfate initiator solution of polymerization;

[0021] (2) 240 kilograms of vinyl acetate, 100 kilograms of hydroxyethyl methacrylate, and 5 kilograms of diacetone acrylamide are mixed and stirred evenly to make 345 kilograms of mixed monomers;

[0022] (3) Add 548 kg of water, 1 kg of defoamer F681, 2 kg of buffer sodium bicarbonate, 4 kg of emulsifier Co436 into the reaction kettle, add 10 kg of PVA2488 and 30 kg of PVA1792 under the condition of dispersing and stirring, stir and disperse for 10 minutes Then heat up to 85°C to dissolve for 50 minutes, then cool down to 50°C, add 20 kg of vinyl acetate and 15 kg of ammonium persulfate solution, stir and disperse for 10 minutes;

[0023] (4) Raise the temperature to 72°C, keep warm for 15 minutes until there is no reflux, and add 345 kg of mixed monomers in step (2) with a co...

Embodiment 3

[0024] Embodiment three total amount=1000kg

[0025] (1) 2 kilograms of ammonium persulfate are dissolved in 50 kilograms of water, obtain the ammonium persulfate initiator solution of polymerization;

[0026] (2) 29 kilograms of vinyl acetate, 150 kilograms of hydroxyethyl methacrylate, and 8 kilograms of diacetone acrylamide are mixed and stirred evenly to make 448 kilograms of mixed monomers;

[0027] (3) Add 400 kg of water, 2 kg of defoamer F681, 2 kg of buffer sodium bicarbonate, and 5 kg of emulsifier Co436 into the reaction kettle, add 60 kg of polyvinyl alcohol PVA1792 under the condition of dispersing and stirring, and stir and disperse for 10 minutes Heat up to 90°C to dissolve for 60 minutes, then cool down to 60°C, add 30 kg of vinyl acetate and 15 kg of ammonium persulfate solution, stir and disperse for 15 minutes;

[0028] (4) Raise the temperature to 78°C, keep it warm for 15 minutes until there is no reflux, and add 448 kg of mixed monomers in step (2) dropw...

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Abstract

The invention belongs to the technical field of adhesive, and specifically relates to a preparation method of a polyvinyl acetate woodworking adhesive with a long open time. According to the preparation method, hydroxyethyl methacrylate (HEMA) taken as polyhydroxyl monomers is introduced into copolymerization monomers, diacetone acrylamide is taken as the crosslinking agent and carries out crosslinking with HEMA to form a network capsular cavity structure, water molecules and hydroxyl groups of HEMA form hydrogen bonds in the capsular cavity, the water retention function is realized, and the open time is prolonged. Water is taken as the dispersing medium of the polyvinyl acetate woodworking adhesive; the use is convenient, no environmental pollution is generated; and compared with a conventional polyvinyl acetate woodworking adhesive with a same solid content, the open time of the provided adhesive is longer.

Description

technical field [0001] The invention relates to the preparation technology of woodworking adhesive with special performance, in particular to a preparation method of polyvinyl acetate woodworking adhesive with long open time. Background technique [0002] my country is a big country in the production and consumption of wood products, which has led to the vigorous development of wood adhesives. Water-based polyvinyl acetate (PVAc) adhesive is currently one of the most widely used and used environmentally friendly adhesives. It is obtained by emulsion polymerization with water as the dispersion medium, and is a water-based environmentally friendly adhesive. It is widely used in wood, furniture, decoration, printing, textiles, etc. , leather, paper and other industries, is a very environmentally friendly adhesive. [0003] With the development of the national economy and the development of application fields, its usage will increase significantly. However, there are many di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J131/04C08F218/08C08F220/20C08F220/58
CPCC08F218/08C08F220/20C08F220/58C08L2205/02C08L2205/03C09J131/04C08L29/04
Inventor 章勇生罗平宋志强牟海燕
Owner 顶立新材料科技股份有限公司
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