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Processing method of resin-impregnated film adhesive with low formaldehyde release

A technology of impregnated film paper and low formaldehyde release, which is applied in the direction of adding paper forming aids, paper, papermaking, etc., to achieve the effect of reducing the probability of release

Inactive Publication Date: 2015-05-13
ZHEJIANG DILONG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The formaldehyde emission of the impregnated film paper produced by the existing conventional process is Class B or Class A (≤1.5mg / l), which needs further improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of environment-friendly water-based urea-formaldehyde resin:

[0026] Formula: 100kg of formaldehyde, 62kg of urea, 14kg of water, 15kg of accelerator (accelerator 013 produced by Keruida Chemical Co., Ltd.).

[0027] method:

[0028] (1) Put 100kg of formaldehyde into the reactor, adjust the pH to 8.0-8.5 with 30% (w / w) sodium hydroxide solution, put in 30kg of urea, start to supply steam to raise the temperature, stop supplying steam to enter the auto- In the heating addition stage, when the temperature is automatically raised to 80°C, it is kept for 20-30 minutes;

[0029] (2) Use 40% (w / w) formic acid solution to adjust the pH to 4.0-4.5, react at 93-95°C for 50 minutes (until thick white mist appears in the glue solution in 35°C water), adjust the pH to 6.5-7.0, and cool down to Put 20kg of urea and 15kg of accelerator at 85°C and keep warm for 15min;

[0030] (3) Cool down to 50°C, drop in 12kg of urea, add 14kg of water, and discharge at 35°C to...

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Abstract

The invention relates to a processing method of a resin-impregnated film adhesive with low formaldehyde release. The method comprises the following steps: additionally arranging roll coating equipment in an impregnating process, hermetically coating a layer of amine-aldehyde resin by utilizing the roll coating equipment after primary impregnation of urea-formaldehyde resin, going in and out of a first section of baking oven, performing secondary amine aldehyde resin coating up and down, going in a second section of baking oven, drying and cooling, and cutting the finished resin-impregnated film adhesive. The processing method has the benefits that (1) a formaldehyde accelerant is adopted in the resin glue production process, so that relative free aldehyde in a glue solution is reduced; (2) as the roll coating equipment is additionally arranged, and the amine-aldehyde resin is hermetically coated immediately after primary impregnation and then goes in the first section of baking oven to be dried, the amine-aldehyde resin forms a good sealing layer, and the outward release probability of formaldehyde is reduced; the formaldehyde release amount of the prepared finished resin-impregnated film adhesive is reduced from original less than or equal to 1.5 mg / l to below 1.0 mg / l.

Description

(1) Technical field [0001] The invention relates to a processing method of low-formaldehyde emission impregnated film paper. (2) Background technology [0002] Impregnated film paper is made of special paper impregnated with amino resin or phenolic resin, dried to a certain degree of curing, and can be bonded to each other or coated on the surface of wood-based panels by hot pressing (referred to as film paper). [0003] The wood-based panels impregnated with film paper do not need secondary coating, and can be directly used for surface decoration, interior decoration and floor covering of furniture, buildings or vehicles and ships. [0004] The formaldehyde emission of the impregnated film paper produced by the existing conventional process is Class B or Class A (≤1.5mg / l), which needs to be further improved. (3) Contents of the invention [0005] The object of the present invention is to provide a processing method for impregnated film paper with low formaldehyde emissi...

Claims

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Application Information

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IPC IPC(8): D21H17/49D21H19/26D21H21/06C08G12/12C08G12/32
Inventor 姜飞雄王占民方敏
Owner ZHEJIANG DILONG NEW MATERIAL
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