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Anti-cracking technology veneer layer and its preparation method and modified water-based polyurethane adhesive

A water-based polyurethane and anti-cracking technology, which is applied in the field of wood processing and manufacturing, can solve the problems that consumers are difficult to accept fiberboard, the market is cold, and the cost is high, so as to improve the effect of anti-cracking, solve the problem of easy cracking, and solve the problem of reduced bonding strength. Effect

Active Publication Date: 2022-07-19
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 technology veneer layer and its preparation method and modified water-based polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Preparation of modified waterborne 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. , and stir and mix for 10 minutes until uniform, that is, the modified water-based polyurethane adhesive is obtained;

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

[0032] 1: the modified water-based polyurethane adhesive prepared above is coated on the veneer, and the sizing amount on one side is 120g / ㎡, and the sizing veneer is obtained;

[0033] II: the sizing veneer obtained in step (1) is carried out to group embryos in the same direction;

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

Embodiment 2

[0043] The implementation steps are the same as in Example 1, except that the PUR hot-melt adhesive of Example 1 is changed to a PVC-specific 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 of the anti-cracking substrate was tested, and it was 2.6MPa; according to the method of 4.36 of 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 is up to level 5 (no cracks are observed on the surface with a 6x magnifying glass).

Embodiment 3

[0046] 1) Preparation of modified waterborne polyurethane adhesive:

[0047] In parts by weight, 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) were successively added to the stirred tank, stirred and mixed. 10min to uniform, that is, the modified water-based polyurethane adhesive is obtained;

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

[0049] According to GB / T 12914 "Determination of Tensile Strength of Paper and Cardboard", the transverse tensile strength of the prepared anti-cracking technical veneer layer was tested. , the test result is 2.5N / mm. According to the method of 4.34 in GB / T 17657-2013 (treatment in a blast drying oven at 70°C for 24 hours), the transverse dimensional shrinkage was tested, and the result was 0.02%.

[0050] 3) Preparation of anti-cra...

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Abstract

The invention provides a preparation method of anti-cracking technical veneer layer. The preparation method comprises the following steps: coating a single board with a modified water-based polyurethane adhesive, forming embryos, cold pressing, and slicing; the modified water-based polyurethane adhesive The preparation method of the adhesive is as follows: 100 parts by weight of an aqueous polyurethane adhesive, 1-10 parts by weight of a thickener, 15-50 parts by weight of a moisturizing agent, and 2-25 parts by weight of a reinforcing agent are mixed uniformly.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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