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Formaldehyde-free adhesive for paper impregnated thermosetting resin and preparation method of adhesive

A technology of impregnating film paper and adhesives, which is applied in the direction of paper, papermaking, textiles and papermaking, etc., can solve the problems of poor scratch resistance, high degree of cross-linking, unreachable gloss and plumpness, etc., and achieve improvement Scratch resistance, solve the damage between paper, improve the effect of hanging glue

Active Publication Date: 2020-07-14
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because of its high viscosity, large particle size, and high degree of crosslinking, organic polymer resin adhesives are difficult to penetrate into the interior of the decorative base paper, and there are many problems.
Compared with the traditional urea-formaldehyde glue and melamine-formaldehyde glue, the decorative paper impregnated with this kind of adhesive has a low glue content and poor physical properties, especially poor scratch resistance, low hardness, glossiness and plumpness. It meets the requirements of the relevant national standards, and because the glue is difficult to penetrate into the paper layer, there is a defect of peeling between the decorative paper and the paper

Method used

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  • Formaldehyde-free adhesive for paper impregnated thermosetting resin and preparation method of adhesive
  • Formaldehyde-free adhesive for paper impregnated thermosetting resin and preparation method of adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Add polyethylene glycol (molecular weight 200) and isophorone diisocyanate into a reaction kettle with a stirring and reflux device according to a molar ratio of 0.8, and carry out a prepolymerization reaction under the protection of high-purity nitrogen. The temperature is 40°C, and the reaction time is 1h to obtain a polyurethane prepolymer.

[0028] 2) The temperature of the prepolymer was raised to 65° C., and 1,4-butanediol was added dropwise to the prepolymer for 20 minutes. The chain extension reaction lasted 1.5 hours, and the stirring speed was 50 r / min. Then the temperature was lowered to 40°C, and the hydrophilic agent was added, and the addition was completed within 30 minutes, and the reaction time of this step was 0.5 hours.

[0029] 3) Cool to room temperature, add glacial acetic acid for neutralization, and reduce viscosity with appropriate amount of acetone. After the viscosity is suitable, add water and high-speed shearing. The shearing speed is 200...

Embodiment 2

[0038] 1) Add polyester diol CMA-1024 and isophorone diisocyanate into a reaction kettle with a stirring and reflux device according to a molar ratio of 2, and carry out a prepolymerization reaction under the protection of high-purity nitrogen, and the reaction temperature The temperature is 60°C, the reaction time is 0.5h, and the polyurethane prepolymer is obtained.

[0039]2) The temperature of the prepolymer was raised to 80°C, and ethylene glycol was added dropwise to the prepolymer for 10 min, the chain extension reaction time was 0.5 h, and the stirring speed was 100 r / min. Then the temperature was lowered to 60°C, and the hydrophilic agent was added, and the addition was completed within 30 minutes, and the reaction time of this step was 1.5 hours.

[0040] 3) Cool to room temperature, add glacial acetic acid for neutralization, and reduce viscosity with appropriate amount of acetone. After the viscosity is suitable, add water and high-speed shearing. The shearing spee...

Embodiment 3

[0049] 1) Add polyester diol CMA-1024, Polyethylene Glycol (both molar ratio 1: 1) and hexamethylene diisocyanate into the reactor with stirring and reflux device according to molar ratio 1.3, in Under the protection of high-purity nitrogen, a prepolymerization reaction was carried out at a reaction temperature of 50° C. and a reaction time of 0.7 h to obtain a polyurethane prepolymer.

[0050] 2) The temperature of the prepolymer was raised to 75° C., and propylene glycol was added dropwise to the prepolymer for 15 minutes, the chain extension reaction time was 0.8 hours, and the stirring speed was 80 r / min. Then the temperature was lowered to 50°C, and the hydrophilic agent was added, and the addition was completed within 30 minutes, and the reaction time of this step was 1 hour.

[0051] 3) Cool to room temperature, add glacial acetic acid for neutralization, and reduce viscosity with appropriate amount of acetone. After the viscosity is suitable, add water and high-speed s...

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Abstract

The invention discloses a formaldehyde-free adhesive for paper impregnated thermosetting resin with physical strength meeting national standard requirements and a preparation method of the adhesive. The formaldehyde-free adhesive is prepared from the following components in parts by weight: 30 to 50 parts of waterborne polyurethane emulsion, 1 to 5 parts of nano cellulose, 5 to 10 parts of fillerand 200 to 300 parts of water. The preparation method comprises the following steps: according to a formula ratio, putting nano cellulose into water and waterborne polyurethane emulsion at room temperature, and stirring for 5-10min at 500-800r / min; and then adjusting the stirring speed to 1000-3000 r / min, meanwhile, adding the filler, continuing to stir for 10-20 min, and standing to obtain the product. The formaldehyde-free adhesive prepared by the preparation method disclosed by the invention is free from formaldehyde release, safe and environment-friendly, and the polyurethane emulsion is relatively small in particle size, relatively small in molecular weight and moderate in viscosity, so that the impregnating adhesive can better permeate into paper, the problem of inter-paper damage ofthe paper impregnated by a common resin adhesive is solved, meanwhile, the glue hanging amount of the impregnated film adhesive is increased, and the scratch resistance of the film adhesive can be improved to a certain extent.

Description

technical field [0001] The invention relates to an adhesive for non-formaldehyde impregnated film paper and a preparation method thereof, belonging to the technical field of wood-based panel processing. Background technique [0002] As the most widely used type of decorative paper, impregnated film paper is generally made of base paper after impregnation, printing, and impregnation. For a long time, the two-stage dipping process of urea-formaldehyde glue and melamine-formaldehyde glue has been used in the impregnation treatment. The impregnated film paper-faced wood-based panel products produced have excellent physical properties such as hardness, wear resistance, and scratch resistance. However, this traditional dipping method will release free formaldehyde during production and product use, which is harmful to the health of operators and consumers. With the improvement of people's requirements for the indoor environment and the promulgation of relevant national environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/57D21H17/25D21H17/67D21H17/68C08G18/75C08G18/66C08G18/48C08G18/32C08G18/73C08G18/42
CPCD21H17/57D21H17/25D21H17/675D21H17/68C08G18/755C08G18/6674C08G18/4833C08G18/664C08G18/73C08G18/6607C08G18/4018C08G18/42
Inventor 徐建峰龙玲刘如
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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