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Adhesive for veneering of artificial board and preparation method of adhesive

A veneer and board-making technology, applied in the direction of adhesives, adhesive types, polymer adhesive additives, etc., can solve the problems of easy dislocation, easy to stick to the plate, poor initial viscosity, etc., to increase hydrophobicity, prevent The effect of penetrating glue and improving initial viscosity

Inactive Publication Date: 2013-04-10
EVERFIRST WISEFUND TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, urea-formaldehyde resin glue is easy to permeate, resulting in glue penetration, poor initial adhesion, and thin wood is easy to move when pasted on the base material. In addition, it is easy to stick to the pressure plate when hot pressing the veneer.

Method used

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  • Adhesive for veneering of artificial board and preparation method of adhesive
  • Adhesive for veneering of artificial board and preparation method of adhesive
  • Adhesive for veneering of artificial board and preparation method of adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of urea-formaldehyde resin 1

[0026] Raw material formula:

[0027]

[0028] Concrete reaction steps are as follows:

[0029] 1) Add formaldehyde to the reaction kettle one by one, adjust the pH to 9.0-11.0 with sodium hydroxide, then add acetaldehyde and the first batch of urea, heat up to 70-90°C, and keep warm for 60-120 minutes;

[0030] 2) Then lower the temperature to 40°C, adjust the pH to 7.0-9.5 with sodium hydroxide solution, add the second batch of urea, then raise the temperature to 75-95°C, and keep warm for 30-90 minutes;

[0031] 3) Adjust pH to 3-6, react to viscosity: apply -4 cups for 19s (30°C);

[0032] 4) Adjust the pH to 5-7, add the third batch of urea, control the temperature at 80-90°C, and react to viscosity: apply -4 cups for 23s (30°C);

[0033] 5) Adjust the pH to 7.0-7.5, add the fourth batch of urea and melamine, control the temperature at 75-80°C, keep warm for 10-40 minutes, and cool down;

[0034] 6...

Embodiment 2

[0036] Embodiment 2: the preparation of urea-formaldehyde resin 2

[0037] Raw material formula:

[0038]

[0039] Concrete reaction steps are as follows:

[0040] 1) Add formaldehyde to the reaction kettle one by one, adjust the pH to 9.0-11.0 with sodium hydroxide, then add butyraldehyde and the first batch of urea, raise the temperature to 70-90°C, and keep it warm for 60-120 minutes;

[0041] 2) Then lower the temperature to 40°C, adjust the pH to 7.0-9.5 with sodium hydroxide solution, add the second batch of urea, then raise the temperature to 75-95°C, and keep warm for 30-90 minutes;

[0042] 3) Adjust pH to 3-6, react to viscosity: apply -4 cups for 20s (30°C);

[0043] 4) Adjust the pH to 5-7, add the third batch of urea, control the temperature at 80-90°C, and react to viscosity: apply -4 cups for 24s (30°C);

[0044] 5) Adjust the pH to 7.0-7.5, add the fourth batch of urea and melamine, control the temperature at 75-80°C, keep warm for 10-40 minutes, and cool...

Embodiment 3

[0047] Embodiment 3: the preparation of urea-formaldehyde resin 3

[0048] Raw material formula:

[0049]

[0050] Concrete reaction steps are as follows:

[0051] 1) Add formaldehyde to the reaction kettle one by one, adjust the pH to 9.0-11.0 with sodium hydroxide, then add paraformaldehyde and the first batch of urea, heat up to 70-90°C, and keep warm for 60-120 minutes;

[0052] 2) Then lower the temperature to 40°C, adjust the pH to 7.0-9.5 with sodium hydroxide solution, add the second batch of urea, then raise the temperature to 75-95°C, and keep warm for 30-90 minutes;

[0053] 3) Adjust pH to 3-6, react to viscosity: apply -4 cups for 21s (30°C);

[0054] 4) Adjust the pH to 5-7, add the third batch of urea, control the temperature at 80-90°C, and react to viscosity: Tu-4 cups for 26s (30°C);

[0055] 5) Adjust the pH to 7.0-7.5, add the fourth batch of urea and melamine, control the temperature at 75-80°C, keep warm for 10-40 minutes, and cool down;

[0056] 6...

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Abstract

The invention relates to an adhesive for a veneering of an artificial board and a preparation method of the adhesive. The adhesive comprises the components in parts by weight: 200 parts of formaldehyde, 20-50 parts of a modifier, 110-140 parts of urea, 5-15 parts of tripolycyanamide, and 1-10 parts of a tackifier. By addition of appropriate parts of modifier, on the one hand, the high solid content adhesive can be prepared without dehydration, moisture brought to a base material during coating is reduced, permeation of the adhesive is reduced, and glue penetration is reduced. In addition, through addition of the modifier, the molar ratio of formaldehyde and urea in the polycondensation phase in the urea resin synthetic process can be greatly reduced, so that hydrophilic radicals in the resin structure are greatly decreased. Meanwhile, tripolycyanamide in appropriate parts is added to modify, so that the water-solubility of the adhesive is reduced, the hydrophobicity of the adhesive is enhanced, and glue penetration is beneficially reduced. The tackifier in appropriate parts is added to improve the initial adhesion of the adhesive and reduce malposition of a veneer on the base material, so that the product quality is improved.

Description

technical field [0001] The invention relates to an adhesive and a preparation method thereof, in particular to an adhesive for wood-based panel veneer and a preparation method thereof, belonging to the field of wood-based board adhesives. Background technique [0002] Wood has special advantages among the four major materials today. Its natural texture, color, moisture absorption and dehumidification, and heat and sound insulation can bring people comfort in many aspects such as vision, hearing and feeling. In recent years, with people's pursuit of a natural "green" living environment, wood has become more and more popular. However, the excessive logging and unreasonable consumption of natural resources have caused the shortage of timber resources, and the shortage of supply has become a worldwide problem. The rise of the wood processing industry with fast-growing wood and inferior wood as raw materials has opened up broad prospects for saving and replacing wood, and has ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/30C09J11/08C08G12/38
Inventor 雷得定刘波王建蔡喜庆
Owner EVERFIRST WISEFUND TECH BEIJING
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