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Evaluation method for initial viscosity of formaldehyde-free adhesive

A technology for formaldehyde-free adhesives and evaluation methods, which is applied in the preparation, sampling, and measuring devices of test samples, and can solve the problems of not being able to effectively reflect the initial tackiness of plywood glue

Active Publication Date: 2021-07-13
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the existing test methods can effectively reflect the initial tack of the glue used for plywood

Method used

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  • Evaluation method for initial viscosity of formaldehyde-free adhesive
  • Evaluation method for initial viscosity of formaldehyde-free adhesive
  • Evaluation method for initial viscosity of formaldehyde-free adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Under normal temperature conditions (25°C / 50% humidity), select a eucalyptus veneer with a thickness of 1.7mm and a moisture content of 15%, cut it into a 50*150mm sample A for testing the bonding strength, and a 40*40cm sample B For hot pressed boards;

[0042] According to 210g / m 2 (The adhesive is Wanhua's self-made formaldehyde-free adhesive-two-component polyurethane glue), evenly coated on the 50*50mm area of ​​model A and the entire surface of model B. Wherein, model A has two layers, and model B has 5 layers), after the billet is assembled, carry out smooth covering pressing with the pressure of 0.005MPa, obtain the covering pressing plate;

[0043] Divide the cladding panels into 7 groups, each group has cladding panels A' formed by 10 samples A and cladding panels B' formed by 1 sample B, and then according to the aging time of 0 min (that is, the group blanks are directly pre-pressed after cladding, The average bonding strength of the pre-compressed board A...

Embodiment 2

[0046] Under normal temperature conditions (25°C / 50% humidity), select eucalyptus veneers with a thickness of 2.1mm and a moisture content of 8% to cut into a 50*150mm sample A for testing the bonding strength, and a 40*40cm sample B For hot pressed boards;

[0047] According to 190g / m 2 The amount of glue applied (adhesive is bean glue), evenly coated in the 50*50mm section of model A and the entire surface of model B, after the glue is applied, directly form the billet (among them, model A is two layers, model B 5 layers), after forming the billet, carry out flat covering pressing with a pressure of 0.003MPa to obtain a covering plate;

[0048]Divide the laminated boards into 5 groups, each group has 10 laminated boards formed by model A and 1 laminated board formed by model B, and then according to the aging time of 0min, 30min, 60min, 90min and 120min, put a group of laminated boards at intervals of 30min The pressure plate is preloaded, and the preloading condition is 0...

Embodiment 3

[0051] Under normal temperature conditions (25°C / 50% humidity), select eucalyptus veneers with a thickness of 3mm and a moisture content of 10% to cut into a 50*150mm sample A for testing the bonding strength, and a 40*40cm sample B for testing on hot-pressed plates;

[0052] According to 220g / m 2 The amount of glue applied (adhesive is EPI glue), evenly coated in the 50*50mm area of ​​model A and a whole surface of model B, after the glue is applied, the billet is directly formed (among them, model A is two layers, model B 5 layers), after the billet is assembled, the pressure of 0.01MPa is used for flat covering.

[0053] The cladding plates are divided into 7 groups, each group has 10 cladding plates formed by model A and 1 cladding plate formed by model B, and then pre-pressed according to 0min (that is, the group blanks are directly pre-pressed after laminating, the gluing of the cladding plates in this group The average strength can be used as the initial pre-compressi...

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Abstract

The invention discloses an evaluation method for the initial viscosity of a formaldehyde-free adhesive. The method comprises the following steps: 1) cutting a single plate into sample plates, wherein the sample plates are divided into a sample plate for testing the bonding strength and a sample plate for hot pressing of a plate; 2) uniformly coating an adhesive in a template interval, and assembling and laminating to obtain laminating plates; 3) grouping the laminating plates, and pre-pressing one group of laminating plates at intervals to obtain pre-pressed plates; (4) after the prepressing is finished, testing the bonding strength of the pre-pressed plates and carrying out hot pressing on the plates. From the beginning of assembly covering and pressing to the pre-pressing of the laminating plates, the laminating plates are placed for different time, according to whether the bonding strength of the pre-pressed plates in the group is not lower than 70% of the initial pre-pressing bonding strength, the overall bonding strength of more than 80% of the pre-pressed plates in the group is not lower than 0.35 MPa, after hot-pressing the plates, the performance of the obtained plates meet the performance requirement of the corresponding plates in GB / T 9846-2015, and the initial viscosity of the adhesive is evaluated. The method provided by the invention can be used for simply and effectively evaluating the initial viscosity and determining the industrial production feasibility of a formaldehyde-free adhesive to a certain extent.

Description

technical field [0001] The invention belongs to the field of plywood, in particular to the field of formaldehyde-free plywood, and relates to a method for evaluating the initial tack of a formaldehyde-free adhesive. [0002] technical background [0003] With the enhancement of people's health awareness, new formaldehyde-free and environmentally friendly decorative panels have attracted more and more attention. Plywood is the largest type of wood-based panel, and formaldehyde-free plywood has attracted much attention. At present, most of the adhesives for formaldehyde-free plywood on the market have problems such as poor initial viscosity of the glue, which affects the continuity of the board-making process and even limits the promotion of formaldehyde-free plywood adhesives. [0004] How to effectively determine the initial tack of glue for plywood? At present, the more common initial tack test methods include "ring tack", "probe tack" and "rolling ball tack test". Loop t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01N1/28
CPCG01N19/04G01N1/286
Inventor 张梓军
Owner WANHUA CHEM GRP CO LTD
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