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Anti-cracking technical veneer layer, preparation method thereof and modified waterborne polyurethane adhesive

A technology of water-based polyurethane and adhesive, which is applied in the field of wood processing and manufacturing, can solve the problems of cold market response, high cost, and difficulty in accepting fiberboard by consumers, achieve high strength, improve the anti-cracking effect, and solve the problem of reduced bonding strength Effect

Active Publication Date: 2020-10-27
ZHEJIANG SHENGHUA YUNFENG GREENEO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to adapt to the dry climate in the north and avoid cracking problems, some manufacturers use ultra-thin fiberboards with a thickness of 1.0-1.2mm to replace poplar bark and technical wood, but the market response is cold, because consumers who choose ecological boards are difficult to accept fiberboards ; Some manufacturers used fireproof boards instead of impregnated film paper decorations in the early days, but the color, visual effects, tactile effects, etc. are difficult to meet the rapidly changing market demand, and the cost remains high

Method used

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  • Anti-cracking technical veneer layer, preparation method thereof and modified waterborne polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Preparation of modified water-based polyurethane adhesive:

[0030] In parts by weight, 100 parts by weight of water-based polyurethane, 1 part by weight of anionic polyacrylamide, 30 parts by weight of glycerol, and 15 parts by weight of latent isocyanate compounds (Wanhua Chemical CW-20) were sequentially added to the stirred tank. , stirring and mixing for 10 minutes until uniform, the modified water-based polyurethane adhesive is prepared;

[0031] 2) Preparation of anti-cracking technology veneer:

[0032] I: Coat the veneer with the modified water-based polyurethane adhesive prepared above, and the amount of sizing on one side is 120g / ㎡, to obtain the sized veneer;

[0033] II: Carry out embryo formation in the same direction with the glued veneer obtained in step (I);

[0034] III: After the embryo reaches the predetermined height, start cold pressing, the unit pressure is 1.5MPa, and the time is 7 days, and the anti-cracking technology wooden square is obta...

Embodiment 2

[0043] The implementation steps are the same as in Example 1, except that the PUR hot melt adhesive in Example 1 is changed to a special PVC veneer adhesive, and the coating amount is changed from 80g / ㎡ on one side to 120g / ㎡ on one side.

[0044] According to the method of 4.16 in GB / T 17657-2013, the surface bonding strength test of the anti-cracking substrate is 2.6MPa; according to the method of 4.36 in GB / T 17657-2013 (treatment in a blast drying oven at 70°C for 24 hours) , the anti-cracking performance test of the anti-cracking ecological board, up to level 5 (with a 6 times magnifying glass to observe the surface without cracks).

Embodiment 3

[0046] 1) Preparation of modified water-based polyurethane adhesive:

[0047] In parts by weight, add 100 parts by weight of water-based polyurethane, 8 parts by weight of flour, 40 parts by weight of diethylene glycol, and 20 parts by weight of latent isocyanate compounds (Wanhua Chemical CW-20) in the stirred tank, stirring and mixing 10min until uniform, the modified water-based polyurethane adhesive is prepared;

[0048] 2) Preparation of anti-cracking technical veneer: the steps are the same as in Example 1.

[0049] According to GB / T 12914 "Determination of Tensile Strength of Paper and Cardboard", the transverse tensile strength test was carried out on the prepared anti-cracking technical veneer layer. The size of the test piece was 100mm*15mm, and the number was 10 pieces. , the test result is 2.5N / mm. According to the method of 4.34 in GB / T 17657-2013 (treatment in a blast oven at 70°C for 24 hours), the transverse dimensional shrinkage rate was tested, and the resu...

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Abstract

The invention provides a preparation method of an anti-cracking technical veneer layer. The preparation method comprises the following steps: coating a veneer with a modified waterborne polyurethane adhesive, assembling blanks, carrying out cold pressing, and slicing. The preparation method of the modified waterborne polyurethane adhesive comprises the following steps: uniformly mixing 100 parts by weight of the waterborne polyurethane adhesive, 1-10 parts by weight of the thickening agent, 15-50 parts by weight of the humectant and 2-25 parts by weight of the reinforcing agent.

Description

technical field [0001] The invention belongs to the field of wood processing and manufacturing, and in particular relates to a preparation method of an anti-cracking technology veneer layer and a modified water-based polyurethane adhesive. Background technique [0002] Adhesive film paper veneer plywood and blockboard, commonly known as ecological board, is a type of board obtained by hot pressing plywood or blockboard as the base material and impregnating film paper on the surface. Ecological board is a new type of decorative board that has been developed rapidly in China in the past ten years. Its production technology is obtained through improvement and innovation by referring to impregnated film paper facing particleboard and fiberboard. According to statistics, the output of ecological panels in 2019 will reach 15 million m 3 , with an output value of 50 billion. [0003] At present, a key problem restricting the healthy development of the ecological board industry is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J133/26C09J103/02C09J11/06C09J11/08B27L5/00B27D1/08
CPCC09J175/04C09J11/06C09J11/08B27L5/00B27D1/08C08L33/26C08K5/053C08K5/29C08L3/02C08K5/06
Inventor 顾水祥桂成胜沈来斌赵建忠沈云芳庞小仁戴雪枫唐雨枫高水昌
Owner ZHEJIANG SHENGHUA YUNFENG GREENEO