Unlock instant, AI-driven research and patent intelligence for your innovation.

Lumber adhesion agent and method of manufacturing the same

A technology of wood adhesives and adhesives, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of no public reports, reduce storage period, increase costs, etc., and achieve high bonding strength , low production cost, good water resistance

Inactive Publication Date: 2008-01-23
SOUTHWEST FORESTRY UNIVERSITY
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MUF resin also has some disadvantages. For example, it has certain requirements for storage temperature. Generally speaking, storage temperature lower or higher than 25°C will reduce its storage period.
In addition, due to the use of melamine in the resin, the cost of the resin increases with the amount of melamine used
[0003] Through literature search, there is no public report identical with the present invention

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: (every part is parts by weight, gram or kilogram)

[0018] The adhesive is formed by polycondensation of formaldehyde, urea, melamine and phenol; among them:

[0019] a. The molar ratio of urea, melamine and phenol is 11.5:7.6:1; the molar ratio of formaldehyde / urea+melamine+phenol is 1.0:1;

[0020] b. The appearance of the wood adhesive is a transparent light yellow-brown emulsion, the solid content is 53%, the viscosity is Tu-4 cup 17s, and the density is 1.26g / cm 3 , PH is 8.2, gel time is 75s, storage period is 3 weeks.

[0021] The preparation method step of wood adhesive is as follows:

[0022] a. Take 718 parts of 37% formaldehyde, adjust the pH value to 8.5 with NaOH, add 259 parts of urea, raise the temperature to 80°C, keep it for 15 minutes, adjust the pH value to 4.0, until ice fog appears;

[0023] b. Use NaOH to adjust the pH value to 5.8, add 148 parts of urea, heat to 90°C, and keep for 10 minutes;

[0024] c. Add 106 parts of urea and...

Embodiment 2

[0028] Embodiment 2: (every part is parts by weight, gram or kilogram)

[0029] The adhesive is formed by polycondensation of formaldehyde, urea, melamine and phenol; among them:

[0030] a. The molar ratio of urea, melamine and phenol is 11.5:7.6:1; the molar ratio of formaldehyde / urea+melamine+phenol is 1.1:1;

[0031] b. The appearance of the wood adhesive is a transparent light yellow-brown emulsion, the solid content is 65%, the viscosity is Tu-4 cup 19s, and the density is 1.27g / cm 3 , PH is 8.8, gel time is 90s, storage period is 2.5 weeks.

[0032] The preparation method step of wood adhesive is as follows:

[0033] a. Take 907 parts of 37% formaldehyde, adjust the pH value to 9.5 with NaOH, add 294 parts of urea, raise the temperature to 90°C, keep it for 30 minutes, adjust the pH value to 5.0, until ice fog appears;

[0034] b. Use NaOH to adjust the pH value to 6.8, add 168 parts of urea, heat to 90°C, and keep for 20 minutes;

[0035] c. Add 120 parts of urea a...

Embodiment 3

[0039] Embodiment 3: (every part is parts by weight, gram or kilogram)

[0040] The adhesive is formed by polycondensation of formaldehyde, urea, melamine and phenol; among them:

[0041] a. The molar ratio of urea, melamine and phenol is 11.5:7.6:1; the molar ratio of formaldehyde / urea+melamine+phenol is 1.2:1;

[0042] b. The appearance of the wood adhesive is a transparent light yellow-brown emulsion, the solid content is 60%, the viscosity is Tu-4 cup 18s, and the density is 1.265g / cm 3 , PH is 8.5, gel time is 95s, storage period is 2 weeks.

[0043] The preparation method step of wood adhesive is as follows:

[0044] a. Take 1096 parts of 37% formaldehyde, adjust the pH value to 9.0 with NaOH, add 330 parts of urea, raise the temperature to 85°C, keep it for 20 minutes, adjust the pH value to 4.5, until ice fog appears;

[0045] b. Use NaOH to adjust the pH value to 6.0, add 188 parts of urea, heat to 90°C, and keep for 15 minutes;

[0046] c. Add 134 parts of urea a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
timeaaaaaaaaaa
solid contentaaaaaaaaaa
Login to View More

Abstract

The invention relates to a wood adhesive and the preparation method, which belongs to the technology field of the man-made board production. The adhesive consists of formaldehyde, urea, melamine and phenol copolycondensation. The mol ratio of the urea, melamine and phenol is 11.5 : 7.6 : 1 and the mol ratio of the formaldehyde / urea plus melamine plus phenol is 1.0 : 1 to 1.2 : 1. The preparation method is that the melamine and phenol are added on the basis of synthesis of urea formaldehyde resin and the formaldehyde solution is adjusted to alkalinity and is added with the urea for the first time; reaction is carried out for a period under the temperature of 80 DEG C. to 90 DEG C. and the pH value is adjusted to acidity, and the urea is added for the second time and then for the third time after reaction for a period; the melamine and the formaldehyde solution are added and the pH value is adjusted to alkalinity; the phenol and the formaldehyde are added and react until the end, and the pH value is adjusted to alkalinity, and the last urea is added to synthesize the wood adhesive with high performance finally. The wood adhesive of the invention has the advantages of strong adhesive force, low formaldehyde release amount and high water resistance, which is suitable for the production of the outdoor grade man-made board and the dampproof man-made board.

Description

Technical field: [0001] The invention relates to a wood adhesive and a preparation method thereof, belonging to the technical field of wood-based panel production. Background technique: [0002] Urea-formaldehyde resin is a kind of adhesive with the largest consumption in my country's wood processing industry because of its abundant raw materials, low price and excellent performance. However, it also has the disadvantages of poor water resistance and large formaldehyde release, which are limited in application. With the enhancement of people's awareness of environmental protection, the control requirements for the release of free formaldehyde are becoming more and more stringent, the molar ratio of urea-formaldehyde resin is getting lower and lower, and the reduction of the molar ratio of formaldehyde (F) / urea (U) will lead to the deterioration of the overall performance of the resin At the same time, the market has put forward higher requirements for the moisture-proof and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/30
Inventor 杜官本方群雷洪
Owner SOUTHWEST FORESTRY UNIVERSITY