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Preparation method for natural vegetable gum-modified urea-formaldehyde resin

A technology of natural vegetable glue and vegetable glue resin, which is applied in the field of wood-based panel adhesives, can solve the problems of high formaldehyde release and poor water resistance, achieve good water solubility, sufficient resin polycondensation reaction, and improve water resistance.

Active Publication Date: 2015-03-04
DONGYING ZHENGHE WOOD IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a preparation method of vegetable gum modified urea-formaldehyde resin for the shortcomings of conventional modified urea-formaldehyde resin, such as brittleness, high formaldehyde release and poor water resistance.

Method used

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  • Preparation method for natural vegetable gum-modified urea-formaldehyde resin
  • Preparation method for natural vegetable gum-modified urea-formaldehyde resin
  • Preparation method for natural vegetable gum-modified urea-formaldehyde resin

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Experimental program
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Effect test

Embodiment

[0040] The raw material formula of table 1 embodiment one

[0041]

[0042] Note: F and U represent the weights of formaldehyde solution and urea added respectively, U 1 -U 3 respectively represent the weight of urea added in the first to third batches, f and u represent the moles of formaldehyde and urea respectively, u 1 -u 3 respectively represent the moles of urea added in the first to the third batch, and f / u represents the ratio of the moles of formaldehyde to the moles of urea.

[0043] Concrete reaction steps are as follows:

[0044] 1) Synthesis of vegetable gum resin:

[0045]A. Add the measured water, start stirring, then slowly add the measured guar gum, and rinse the coil and the wall of the kettle with water;

[0046] B. After complete dissolution, add triethanolamine, measure pH=8.5-9.0, start to heat up, heat up to 60°C and keep warm, test once every 10 minutes until the viscosity reaches 1000-1200mPa·s;

[0047] C. After reaching the viscosity, adju...

Embodiment 2

[0067] The raw material formula of table 2 embodiment two:

[0068]

[0069] Note: F and U represent the weights of formaldehyde solution and urea added respectively, U 1 -U 3 respectively represent the weight of urea added in the first to third batches, f and u represent the moles of formaldehyde and urea respectively, u 1 -u 3 respectively represent the moles of urea added in the first to the third batch, and f / u represents the ratio of the moles of formaldehyde to the moles of urea.

[0070] Concrete reaction steps are as follows:

[0071] 1) Synthesis of vegetable gum resin:

[0072] A. Add the measured water, start stirring, then slowly add the measured guar gum, and rinse the coil and the wall of the kettle with water;

[0073] B. After complete dissolution, add triethanolamine, measure pH=8.5-9.0, start to heat up, heat up to 60°C and keep warm, test once every 10min until the viscosity reaches 800-1000mPa·s;

[0074] C. After reaching the viscosity, adjust t...

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Abstract

The invention discloses a preparation method for natural vegetable gum-modified urea-formaldehyde resin. The preparation method comprises a vegetable gum resin synthesis step and a vegetable gum-modified urea-formaldehyde resin synthesis step. The vegetable gum resin synthesis step involves the following raw materials in percentage by weight: 85 to 91 percent of water, 2.5 to 8 percent of vegetable gum, 0.1 to 0.2 percent of triethanolamine, 1.5 to 4 percent of 39.540.5wt% glyoxal solution, 0.1 to 0.5 percent of anhydrous sodium carbonate, 1 to 3 percent of urea, 2 to 6 percent of 36.5-37.4wt% formaldehyde solution, 1 to 4 percent of 25wt% ammonia water and 0.2 to 1 percent of melamine. The preparation method has the advantages that the urea-formaldehyde resin is modified by the natural vegetable gum, so that stable loop structures are introduced into resin molecular structures, the toughness of the urea-formaldehyde resin is improved, the number of ether bonds is reduced, and the water resistance of the resin is improved. The resin is fully polycondensated; the water solubility is high; the activity of hydroxymethyl during high-temperature curing is enhanced; the curing of the resin is promoted; the resin density is increased.

Description

technical field [0001] The invention relates to a preparation method of vegetable glue modified urea-formaldehyde resin, in particular to an environment-friendly urea-formaldehyde resin for fiberboard production and a preparation method thereof, belonging to the field of wood-based panel adhesives. Background technique [0002] Due to its excellent performance, easy processing and moderate price, medium and high density fiberboard has been favored by people. With the advancement of science and technology, the continuous emergence and improvement of derivative series products and deep-processing varieties of fiberboard, all kinds of fiberboard will be more and more widely used in various fields of the national economy. [0003] Fibreboard production is inseparable from adhesives. At present, urea-formaldehyde resin glue accounts for more than 90% of the total amount of adhesives used in fiberboard production, and is the most used variety in adhesives. Urea-formaldehyde resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C09J161/32
Inventor 纪良樊茂祥张翔
Owner DONGYING ZHENGHE WOOD IND
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