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Method for preparing wood adhesive using cassava starch hydrolyzed sugar

A technology of wood adhesive and tapioca starch, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve problems such as few reports on research

Active Publication Date: 2014-03-26
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a good development direction to use starch hydrolysis sugar instead of sucrose to prepare wood adhesives with excellent performance and low cost. Such adhesives can be classified as sugar-based wood adhesives, but there are few reports on related research.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] raw material

[0023] The raw materials include: the molar ratio of formaldehyde to urea F / U=1.1, the addition of melamine accounts for 3.6% of the total adhesive, and the addition of tapioca starch hydrolyzed sugar accounts for 25.5% of the total adhesive.

[0024] Wherein, tapioca starch hydrolyzed sugar is prepared according to the following operations:

[0025] 600 kg of water, 8 kg of 30% hydrochloric acid, and 300 kg of cassava starch were fed and stirred in a reaction kettle in a weight ratio of 150:2:75, and the temperature was raised to 67-72°C. The starch began to gelatinize, and then the hydrolysis reaction occurred. ;

[0026] Heat up to 89-91°C, hydrolyze until the viscosity reaches 40-45s (apply -4 cups, 30°C), cool down to 40°C, adjust pH=7.0 with 30% sodium hydroxide solution, and obtain tapioca starch hydrolyzed sugar .

[0027] method

[0028] Add 356.8 kg of 37% formaldehyde aqueous solution to the reaction kettle, adjust the pH to 4.0-4.5 with ...

Embodiment 2

[0035] raw material

[0036] The raw materials include: the molar ratio of formaldehyde to urea is F / U=1.3, the amount of melamine added accounts for 3.6% of the total amount of the adhesive, and the amount of tapioca starch hydrolyzed sugar accounts for 25.5% of the total amount of the adhesive.

[0037] Wherein, tapioca starch hydrolyzed sugar is prepared according to the following operations:

[0038] 600 kg of water, 8 kg of 30% hydrochloric acid, and 300 kg of cassava starch were fed and stirred in a reaction kettle in a weight ratio of 150:2:75, and the temperature was raised to 67-72°C. The starch began to gelatinize, and then the hydrolysis reaction occurred. ;

[0039]Heat up to 89-91°C, hydrolyze until the viscosity reaches 40-45s (apply -4 cups, 30°C), cool down to 40°C, adjust pH=7.0 with 30% sodium hydroxide solution, and obtain tapioca starch hydrolyzed sugar .

[0040] method

[0041] Add 421.6 kg of 37% formaldehyde solution in the reaction kettle, adjust...

Embodiment 3

[0049] raw material

[0050] The raw materials include: the molar ratio of formaldehyde to urea F / U=1.5, the addition of melamine accounts for 3.6% of the total adhesive, and the addition of tapioca starch hydrolyzed sugar accounts for 25.5% of the total adhesive.

[0051] Wherein, tapioca starch hydrolyzed sugar is prepared according to the following operations:

[0052] 600 kg of water, 8 kg of 30% hydrochloric acid, and 300 kg of cassava starch were fed and stirred in a reaction kettle in a weight ratio of 150:2:75, and the temperature was raised to 67-72°C. The starch began to gelatinize, and then the hydrolysis reaction occurred. ;

[0053] Heat up to 89-91°C, hydrolyze until the viscosity reaches 40-45s (apply -4 cups, 30°C), cool down to 40°C, adjust pH=7.0 with 30% sodium hydroxide solution, and obtain tapioca starch hydrolyzed sugar .

[0054] method

[0055] Add 486.5 kg of 37% formaldehyde solution in the reaction kettle, adjust the pH to 4.0-4.5 with 30% form...

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Abstract

The invention discloses a method for preparing a wood adhesive using cassava starch hydrolyzed sugar. The method is characterized in that the wood adhesive is synthesized from cassava starch hydrolyzed sugar, urea, formaldehyde and melamine under a specific process condition, wherein urea is quantitatively added at three times; pH is modified according to mediate strong acid (4-4.5), weak base (7.5), weak acid (5.0), and weak base (7.5) in sequence during preparation. The adhesive product is low in cost, long in storage time, and relatively high in cost performance, integrates use performance and environmental protection performance, shows a good computability with the existing production process of artificial boards, and can be used for replacing the existing widely used urea resin and melamine formaldehyde resin wood adhesive.

Description

technical field [0001] The invention belongs to the technical field of wood-based panel production in wood processing, and in particular relates to a method for preparing wood adhesive by hydrolyzing sugar from tapioca starch. Background technique [0002] The preparation of high-performance and low-cost wood adhesives from renewable biological resources has become an urgent problem to be solved in my country's wood industry. Sugars in nature (such as starch and sucrose) are renewable biological resources that can be developed and utilized in the production of wood adhesives. Gan Weixing et al. (Study on the synthesis of sucrose-melamine-formaldehyde co-condensation resin adhesive [J]. Forestry Industry, 2011,38(5):18-21) successfully synthesized a series of water-based sucrose-melamine by replacing melamine with high capacity of sucrose -Formaldehyde polycondensation resin (SMF), which has a long storage period, low viscosity, and short curing time (3 to 5 minutes), is use...

Claims

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Application Information

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IPC IPC(8): C08G12/40C08G12/38C09J161/32
Inventor 甘卫星潘礼成杨海兵
Owner GUANGXI UNIV
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