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Preparation and application of formaldehyde-free veneering adhesive for artificial board

A technology of veneer glue and wood-based panels, applied in the direction of adhesives, adhesive types, adhesive additives, etc., can solve problems such as general water resistance, slabs that cannot be demoulded, and short open time

Active Publication Date: 2021-07-30
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bean glue system has a large amount of glue, which is prone to the problems of glue bleeding and sticking to the surface of the board; the API glue system generally has a short opening time and hot-pressed boards (that is, due to glue penetration, during the hot-pressing process, the slabs stick together. On the hot pressing plate, the slab cannot be demoulded), CN107011832B provides a solution for formaldehyde-free veneer, by introducing water-based polyurethane resin, prolonging the storage stability and timeliness of the glue in a water-based environment, The addition of curing agent (isocyanate) in this solution is small, and the water resistance of the board is average after veneering. However, when the amount of curing agent is too much, the veneer will be severely bonded by hot pressing.

Method used

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  • Preparation and application of formaldehyde-free veneering adhesive for artificial board
  • Preparation and application of formaldehyde-free veneering adhesive for artificial board
  • Preparation and application of formaldehyde-free veneering adhesive for artificial board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5 and comparative example 1-2

[0044] Raw material mass percent composition (wt%) composition comprises in embodiment and comparative example:

[0045] name Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1 Comparative example 2 EVA emulsion 62 60 65 60 60 40 65 PVA solution 8 10 5 5 8 20 5 process water 8 8 5 10 5 10 5 flour 6 6 12 10 9 12 12 filler 4 8 3 5 3 5 3 Modified isocyanate 12 8 10 10 15 13 10

[0046] Preparation of formaldehyde-free veneer adhesive, including:

[0047] 1. Preparation of modified isocyanate:

[0048] Pour 300g of isocyanate into a 500ml three-neck flask, slowly heat to 50°C, and add RS710 dropwise into the isocyanate liquid under stirring conditions, stir for about 50min, take it out, and set aside;

[0049] in:

Embodiment 1

[0050] In Example 1, the isocyanate is CW20, the addition amount of RS710 is 30g; the EVA emulsion is 102H; the solid content of the PVA solution is 5%; the filler is calcium carbonate;

Embodiment 2

[0051] In Example 2, the isocyanate is CW30, the addition amount of RS710 is 15g; the EVA emulsion is 102H; the solid content of the PVA solution is 8%; the filler is talcum powder;

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Abstract

The invention discloses preparation and application of a formaldehyde-free veneering adhesive for an artificial board, and relates to the field of a preparation technology and application of the formaldehyde-free veneering adhesive. The raw materials mainly comprise the following components: an EVA emulsion, a PVA solution, water, flour, a filler and modified isocyanate. The modified isocyanate is obtained by heating isocyanate to a certain temperature, slowly adding an emulsifier and stirring. The veneering adhesive prepared by the invention is good in flowability, excellent in initial adhesion, long in opening time and non-sticky in hot pressing, especially in thin plate veneering, the veneering adhesive is non-sticky in hot pressing, and the surface is not permeated by the adhesive and is free from stains; and after veneering, the plate has excellent performance.

Description

technical field [0001] The invention relates to the field of home decoration adhesives, in particular to the preparation and application of a formaldehyde-free veneer adhesive for wood-based panels. [0002] technical background [0003] With the increasing awareness of environmental protection, formaldehyde-free plywood has gradually become popular among people in recent years, especially in the second half of 2020, Oupai custom furniture will fully promote formaldehyde-free wood-based panels, and custom furniture and home decoration will accelerate formaldehyde-free. Compared with the non-formaldehyde of the plain board, the progress of the non-formaldehyde veneer glue of the board is slow. [0004] The common veneer glue on the market is mostly "trialdehyde glue". This type of veneer glue will continuously release formaldehyde for a long time during use, pollute the environment and cause harm to the human body. The solutions of formaldehyde-free veneer glue are mostly bea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J123/08C09J129/04C09J11/04C09J11/06
CPCC09J123/0853C09J11/04C09J11/06C08K2003/265C08K2003/3045C08L29/04C08K5/29C08K3/26C08K3/34C08K3/30C08K5/521
Inventor 张梓军
Owner WANHUA CHEM GRP CO LTD
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