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Formaldehyde-free polyvinyl acetate wood adhesive and preparation method thereof

A technology of formaldehyde-free polyvinyl acetate and wood adhesive, applied in the direction of monocarboxylate copolymer adhesive, adhesive type, etc., to achieve the effect of strong initial adhesive force, fast curing speed and practical construction

Active Publication Date: 2015-03-18
CHANGDE FURONG INDAL DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to control production costs and improve product performance, many manufacturers of such adhesives on the market today use formaldehyde or aldehyde-containing chemical materials for modification, so that the glue contains more or less harmful substances to the environment and human health. Aldehydes with serious effects

Method used

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  • Formaldehyde-free polyvinyl acetate wood adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Put 30 parts of polyvinyl alcohol into the reaction bottle, add 200 parts of water, heat up to 95°C, keep warm and stir. Until it is completely dissolved, cool down to 40°C, filter and set aside;

[0056] Two, 0.2 part of ammonium persulfate is mixed with the aqueous solution of weight concentration 10%;

[0057] 3. Polymerization reaction

[0058] Add 0.2 parts of sodium lauryl sulfate, 1.5 parts of nonionic surfactant (OP-10) and 200 parts of water to half of the polyvinyl alcohol solution, and stir for 30 minutes;

[0059] Add 120 parts of vinyl acetate dropwise;

[0060] Add ammonium persulfate solution dropwise, heat up to 70°C, stir, keep warm for 50 minutes, until there is no obvious reflux, raise the temperature to 95°C, react for 30 minutes, cool to 50°C, add an appropriate amount of sodium bicarbonate with a weight concentration of 15 solution, adjusted to a pH value of 5.5, and set aside;

[0061] 4. Compounding

[0062] Add 40 parts of starch ...

Embodiment 2

[0066] In Example 1, in the second step of the polymerization reaction, 120 parts of vinyl acetate and a mixed monomer of the following substances were added dropwise: 4 parts of butyl acrylate, 1 part of acrylic acid, 2 parts of methyl methacrylate , 3 parts of β-hydroxypropyl acrylate.

[0067] exist figure 1 In, embodiment 3:

[0068] 1. Put 20 parts of polyvinyl alcohol (1788) and 20 parts of polyvinyl alcohol (1799) into the reaction bottle, add 270 parts of deionized water to mix for 0.5 hours, raise the temperature to 80°C, stir for 4 hours, and wait for the polyvinyl alcohol After basically dissolving, heat up to 95°C, heat and stir until completely dissolved, then cool down to 40°C, filter and set aside;

[0069] Two, 0.6 part of ammonium persulfate is prepared into a 10% aqueous solution for subsequent use;

[0070] 3. Add 0.6 parts of sodium lauryl sulfate, 2.0 parts of non-ionic surfactant (OP-10) and 270 parts of deionized water into the polyvinyl alcohol react...

Embodiment 4

[0075] In Example 3, there was no addition of butyl acrylate, acrylic acid, methyl methacrylate, and β-hydroxypropyl acrylate in step 4, and only 120 parts of vinyl acetate were added in step 5.

[0076] The product of above-mentioned four embodiment gained is white homogeneous emulsion;

[0077] The product in embodiment 1, viscosity value is 14100mPa S, and pH value is 5.5;

[0078] The product in embodiment 2, viscosity value is 14800mPa S, and pH value is 5.0;

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Abstract

The invention relates to a formaldehyde-free polyvinyl acetate wood adhesive and a preparation method thereof. The preparation method comprises the following steps: 1. adding sodium lauryl sulfate, non-ionic surfactant and water to one half of a polyvinyl alcohol solution, dropwisely adding vinyl acetate, dropwisely adding an ammonium persulfate solution, heating, stirring, keeping the temperature, and adding a right amount of 10-30 wt% sodium bicarbonate solution to regulate the pH value to 5.0-6.0, thereby obtaining a polymerization emulsion for later use; and 2. compounding: adding starch and the other half of polyvinyl alcohol solution into water, cooling when the starch is completely aged, adding the polymerization emulsion, stirring, adding acetyl tributyl citrate, mineral oil and hydrogel, stirring uniformly, filtering at 40 DEG C, and discharging. The product provided by the invention is a white uniform emulsion of which the viscosity number can be greater than 14000 mPa.S and the pH value is 4-6. The product provided by the invention has the characteristics of high curing speed, high initial bonding power, high continuous bonding strength, mold resistance, aging resistance and favorable adaptability to machines, and is practical and convenient for construction.

Description

technical field [0001] The invention belongs to organic chemical industry, namely an formaldehyde-free polyvinyl acetate wood adhesive and a preparation method thereof. Background technique [0002] There is a big contradiction between the supply and demand of wood in our country, and it is necessary to vigorously develop the comprehensive utilization of wood centered on wood-based panels. For this reason, it is necessary to develop excellent adhesives. At present, synthetic resin wood adhesives mainly include: Urea formaldehyde, melamine formaldehyde, phenolic formaldehyde, resorcinol formaldehyde; Synthetic rubber; Epoxy; Skin, bone glue, casein glue; Polyvinyl acetate emulsion adhesive. The first category of adhesives requires a curing agent, which makes it more difficult in the sizing and coating process, and because it contains formaldehyde and is colored, it pollutes the environment and the coating material; the second category of adhesives requires Using be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J131/04C08F218/08C08F118/08
Inventor 李标模李磊樊华段细群胡知星王英
Owner CHANGDE FURONG INDAL DEV