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Adhesive for formaldehyde-free plywood and preparation method thereof, plywood and preparation method thereof

An adhesive and plywood technology, applied in the field of prepared plywood and its preparation, can solve the problems of slow viscosity growth rate and long opening time, and achieve the effect of prolonging the opening time, moderate hot pressing efficiency, and compensating for the decrease of hot pressing efficiency.

Active Publication Date: 2022-02-18
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There is a need for an adhesive system for formaldehyde-free plywood to solve the problem of formaldehyde release, and an adhesive system with a slow viscosity growth rate at room temperature, a long open time, and a moderate curing rate during hot pressing to prepare plywood

Method used

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  • Adhesive for formaldehyde-free plywood and preparation method thereof, plywood and preparation method thereof
  • Adhesive for formaldehyde-free plywood and preparation method thereof, plywood and preparation method thereof
  • Adhesive for formaldehyde-free plywood and preparation method thereof, plywood and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of adhesives for formaldehyde-free plywood:

[0050] Step 1: Add 88 parts of deionized water and 12 parts of polyvinyl alcohol 1788 into the reaction kettle, stir at room temperature for 20 minutes, then raise the temperature to 90°C and keep it warm for 2 hours to completely dissolve the polyvinyl alcohol, then cool to room temperature stand-by;

[0051] Step 2: Dissolve 0.6 parts of copper phosphate in 12 parts of phosphoric acid.

[0052] The third step: the phosphoric acid solution of copper phosphate obtained in the second step and 0.5 parts of xanthan gum, 0.5 parts of methyl cellulose, 0.1 part of defoamer, 15 parts of flour and 30 parts of PMDI are added to the polyethylene obtained in the first step In the alcohol solution, continue to stir at room temperature until the mixture is uniform, and then the formaldehyde-free adhesive for plywood is obtained.

[0053] By testing the viscosity growth of the system, the opening time of the system can be m...

Embodiment 2

[0063] Example 2 Adjust polyvinyl alcohol to 7 parts of PVA2488, water to 93 parts, thickener to 0.4 parts of methylcellulose + 0.3 parts of xanthan gum, defoamer to 0.01 parts, phosphoric acid to 15 parts , the copper phosphate is adjusted to 0.8 parts, the flour is adjusted to 20 parts, the PMDI is adjusted to 35 parts, the hot pressing factor is adjusted to 1.5min / mm, and others are the same as in Example 1;

Embodiment 3

[0064]Example 3 The thickener is adjusted to 0.3 parts of methyl cellulose + 0.2 parts of xanthan gum, the defoamer is adjusted to 0.06 parts, phosphoric acid is adjusted to 10 parts, copper phosphate is adjusted to 0.5 parts, flour is adjusted to 30 parts, PMDI Adjusted to 25 parts, sizing amount adjusted to 200g / m 2 , other with embodiment 1;

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Abstract

The invention discloses an adhesive for formaldehyde-free plywood and a preparation method thereof, a plywood prepared by using the adhesive and a preparation method thereof. The adhesive is made of the following raw materials in parts by weight: 7-12 parts of polyvinyl alcohol, 0.5-1 part of thickener, 0.01-0.1 part of defoamer, 10-15 parts of phosphoric acid, 0.5-1 part of copper salt 1 part, 15‑30 parts of flour, 88‑93 parts of deionized water, 25‑35 parts of multifunctional isocyanate. No formaldehyde is produced in the process of adhesive production and plywood preparation, and the formaldehyde emission of the obtained plywood is equivalent to that of the raw material veneer, achieving the goal of no formaldehyde. Phosphoric acid and copper salt are introduced into the adhesive system provided by the present invention, so that the viscosity growth rate of the system is slow at room temperature, the open time is long, the curing rate of the adhesive is moderate during hot pressing, and the plate production efficiency is high.

Description

technical field [0001] The invention relates to a formaldehyde-free adhesive system, in particular to an adhesive system used for preparing plywood, a plywood used for preparing the same and a preparation method thereof. Background technique [0002] Plywood is an important part of the wood-based panel industry. In 2016, China produced 177.56 million cubic meters of plywood, an increase of nearly 7.3% over the previous year, accounting for 59.1% of all wood-based panel production, with an output value of about 367.5 billion yuan. In the past 10 years, the average annual growth rate of plywood production in China has reached 20.6%, which is the fastest growing type of wood-based panels. In 2016, the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China organized the quality supervision and inspection of plywood products, and inspected three items including moisture content, bonding strength, and formaldehyde emission of ply...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J11/04C08G18/62C08G18/64C08G18/79C08G18/76B27D1/08
CPCC09J175/04C09J11/04C08G18/6484C08G18/6212C08G18/4081C08G18/7671C08G18/7614C08G18/794B27D1/08C08K2003/328
Inventor 孙卫华涂松李厚义王向硕张梓军孙鹏
Owner WANHUA CHEM GRP CO LTD
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