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Preparation method of high-strength water-resistant polyvinyl acetate woodworking adhesive

A polyvinyl acetate, high-strength technology, applied in the direction of monocarboxylate copolymer adhesive, adhesive type, etc., can solve the problems of poor water resistance, soft mechanical properties, and limited application of PAVc emulsions

Pending Publication Date: 2021-12-03
顶立新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of PAV, such as soft mechanical properties and poor water resistance, the application of PAVc emulsions is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 0.1kg of defoamer, 60kg of polyvinyl alcohol (PVA), and 600kg of water into the reaction kettle, raise the temperature to 90°C and keep it for 60-70 minutes, then cool down to below 50°C to obtain polyvinyl alcohol solution;

[0021] (2) the sodium hypochlorite of 3kg is dissolved in the water of 10kg; The starch of 3kg, the ammonium persulfate of 0.5kg are dissolved in the water of 10kg and join in the polyvinyl alcohol PVA solution that above-mentioned step (1) dissolves, be warming up to 70 Stir for 50 minutes at ℃; add 5kg of borax and 0.1kg of acrylamide and stir for 20 minutes;

[0022] (3) Add 0.5kg of sodium bicarbonate pH regulator and 0.5kg of emulsifier, and emulsify for 10 minutes;

[0023] (4) the vinyl acetate of 250kg is mixed and stirred with the acrylic acid of 20kg to make the mixed monomer solution of 270kg; The ammonium persulfate initiator of 1.5kg is dissolved in the water of 50kg, obtains the ammonium persulfate initiator solution;

[00...

Embodiment 2

[0026] (1) Add 0.2Kg of antifoaming agent in parts by weight, 80Kg of polyvinyl alcohol (PVA), and 800Kg of water in the reactor, heat up to 90°C and keep it warm for 60-70 minutes, and cool down to 50°C after dissolving to obtain polyvinyl alcohol (PVA) Vinyl alcohol solution;

[0027] (2) Dissolve the sodium hypochlorite of 5Kg in the water of 10Kg; Dissolve the ammonium persulfate of 5Kg, the ammonium persulfate of 1Kg in the water of 10Kg and join in the polyvinyl alcohol PVA solution that above-mentioned step (1) dissolves, be warming up to 70 ℃ Stir for 50 minutes; add 10Kg of borax and 0.5Kg of acrylamide (AM) and stir for 20 minutes;

[0028] (3) Add 1.5Kg of sodium bicarbonate pH regulator and 2Kg of emulsifier, and emulsify for 15 minutes;

[0029] (4) the vinyl acetate of 300Kg is mixed and stirred with the acrylic acid of 30Kg to make the mixed monomer of 330Kg, and the potassium persulfate initiator of 1.5Kg is dissolved in the water of 50Kg;

[0030] (5) The te...

Embodiment 3

[0032] (1) Add 0.15Kg of defoamer by weight, 70Kg of polyvinyl alcohol (PVA), and 700Kg of water into the reactor, heat up to 90°C and keep it warm for 60-70 minutes, and cool down to 50°C after dissolution;

[0033] (2) Dissolve the sodium hypochlorite of 4Kg in the water of 10Kg; Dissolve the ammonium persulfate of 4Kg, the ammonium persulfate of 0.75Kg in the water of 10Kg and join in the PVA solution that above-mentioned step (1) dissolves, be warming up to 70 ℃ and stir for 50 minute; add borax of 7.5Kg, 0.25Kg acrylamide and stir for 25 minutes;

[0034] (3) Add 1Kg of sodium bicarbonate pH regulator, 1Kg of emulsifier, and emulsify for 20 minutes;

[0035] (4) the vinyl acetate of 280Kg is mixed and stirred with the acrylic acid of 25Kg to obtain the mixed monomer solution of 305Kg; The ammonium persulfate initiator of 1.5Kg is dissolved in the water of 50Kg, obtains the ammonium persulfate initiator solution;

[0036] (5) Reactor is warmed up to 78-80 ℃, and after 10 ...

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Abstract

The invention discloses a preparation method of a high-strength water-resistant polyvinyl acetate woodworking adhesive. According to the method, sodium hypochlorite is introduced to oxidize starch to generate carboxyl, aldehyde, keto-carbonyl and other groups; under an acidic condition, carboxyl, aldehyde group and the like can be subjected to esterification reaction and aldolization reaction with hydroxyl on polyvinyl alcohol (PVA) to generate hydrophobic groups such as ester group and the like, so that grafting modification of PVA is realized, the number of hydroxyl on a PVA molecular chain segment is reduced, and a partial cross-linked network structure is formed with PVA, so that the bonding strength is enhanced. The polyvinyl acetate prepared by the invention takes water as a dispersion medium, is convenient to use, has no pollution to the environment, and has higher water resistance and strength compared with the traditional polyvinyl acetate with the same solid content. Volatile matters do not cause harm to human bodies and the environment, and the production environment is safe.

Description

technical field [0001] The present invention relates to special-performance adhesive preparation technology, in particular to a preparation method of high-strength water-resistant polyvinyl acetate woodworking adhesive; [0002] technical background [0003] Polyvinyl acetate emulsion, which came out in 1929, was industrially produced in 1937 and developed rapidly after the 1970s. Since the 1980s, the sales volume of polyvinyl acetate emulsion in my country is second only to urea-formaldehyde resin, ranking second. But now my country advocates new environmentally friendly materials, and water-based polyvinyl acetate (PVAc) emulsions have gradually replaced urea-formaldehyde resins. Polyvinyl acetate emulsion is currently one of the most widely used and used environmentally friendly adhesive varieties. It has a series of advantages such as convenient use, low price, non-toxic, safe and environmentally friendly, and is very popular in the market. However, polyvinyl acetate em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J131/04C08F218/08C08F220/06C08F2/24C08F2/26
CPCC09J131/04C08F218/08C08F2/24C08F2/26C08F220/06
Inventor 汤丽军万江叶鹏金彭奕诚何琳
Owner 顶立新材料科技股份有限公司
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