Flour composition for urea resin and preparation method and application thereof

A technology of urea-formaldehyde resin and composition, applied in the direction of aldehyde/ketone condensation polymer adhesive, starch adhesive, adhesive type, etc., can solve the problems of difficult pre-compression performance and gluing performance, and save food. , good compatibility

Inactive Publication Date: 2015-11-18
广州市北林林产工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the non-benign compatibility of inorganic minerals and organic urea-formaldehyde resins, it is not easy to meet the requirements for pre-pressing performance and bonding performance in wood-based panel production.

Method used

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  • Flour composition for urea resin and preparation method and application thereof
  • Flour composition for urea resin and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. The mixed plant fiber powder is subjected to solid fermentation and hydrolysis treatment by EM bacteria:

[0034] (1) Take the number of effective bacteria as 2×10 10 CUF / mL "Yijiayi" brand biological feed fermentation EM bacteria stock solution 22.5mL, add 30kg of tap water after standing for 24 hours to dilute to form EM bacteria solution;

[0035] (2) In a stirring mixer equipped with a spraying device, put 30 kg of 80-purpose wood powder, 15 kg of 40-purpose corn stalk powder and 5 kg of 40-purpose cassava residue powder, spray and add all the EM bacteria liquid while stirring, stir and stir evenly;

[0036] (3) Move the material in the stirring mixer into an anaerobic fermentation tank for compaction, pass nitrogen gas to remove oxygen, seal it, and ferment naturally for 4 days at room temperature (28-36°C), take samples and measure the pH value to 5.1 with precision pH test paper, and the output Material, promptly obtain the mixed plant fiber powder that is pr...

Embodiment 2

[0041] 1. The mixed plant fiber powder is subjected to solid fermentation and hydrolysis treatment by EM bacteria:

[0042] (1) Take 900mL of tap water and put it into a 1000mL beaker, heat and boil on the electric stove for 5min, take it off, add 100g of brown sugar and stir to dissolve completely, cool to room temperature, add the "Qianmu" brand straw starter EM strains (the effective number of bacteria is CUF×1010CUF / g) 0.5g, stirred and dissolved completely, transferred into a sterilized 1000mL glass bottle, sealed with a rubber stopper, and left at room temperature (25-34°C) for 4 days to obtain the stock solution of EM bacteria. The precision pH test paper with pH 1.0 to 4.3 shows that the pH value is between 3.7 and 4.0, and the number of effective bacteria under the microscope is 1.6×10 10 CUF / mL.

[0043] (2) Get 55 mL of the EM bacteria stock solution prepared above, add 40 kg of tap water after standing for 24 hours and dilute to form EM bacteria liquid;

[0044](...

Embodiment 3

[0050] 1. The mixed plant fiber powder is subjected to solid fermentation and hydrolysis treatment by EM bacteria:

[0051] (1) Take the number of effective bacteria as 2×10 10 CUF / mL "Xingye" brand feed fermentation EM strain 26mL, add 38kg of tap water after standing for 24 hours to dilute to form EM bacteria liquid;

[0052] (2) Put 30kg of 40-mesh wood flour, 10kg of 80-mesh corn stalk powder and 10kg of 80-mesh cassava slag powder into a stirring mixer equipped with a spraying device, spray and add all the EM bacteria liquid while stirring, and stir evenly.

[0053] (3) Move the material in the stirring mixer into an anaerobic fermenter for compaction, pass nitrogen gas to remove oxygen, seal it, and ferment naturally at 14-21°C for 10 days, use precision pH test paper to measure the pH value to 5.1, and discharge the material.

[0054] 2. Prepare the flour composition:

[0055] (1) Put 10 kg of the above-mentioned mixed fiber powder processed through solid fermentation...

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Abstract

The invention discloses a flour composition for urea resin and a preparation method and application thereof. The flour composition is prepared from, by weight parts, 100 parts of mixed plant fiber powder having undergone EM bacterium solid fermentation hydrolysis treatment, 0.15-0.25 part of sodium carboxymethyl cellulose, 4-7 parts of calcium carbonate powder and 8-12 parts of flour. The mixed plant fiber powder having undergone the EM bacterium solid fermentation hydrolysis treatment is prepared according to the following method: matching raw materials which are, by weight parts, 50-60 parts of wood powder, 20-35 parts of corn stalk and 10-20 parts of cassava residue powder, placing the three kinds of powder in a stirring mixer, performing spraying to add EM bacterium liquid with stirring, performing stirring evenly, enabling the number of effective bacterium in the materials to be 0.5-1*10<10> CUF/kg, enabling the moisture content to be 40-50 wt%, and performing fermentation until the measured pH of a sample is 4.0-4.5. The flour composition for urea resin is used for plywood production, can save plenty of grains and have good prepressing performance, the adhesive strength and water resistance of a plywood product are improved compared with the use of wheat flour, and the formaldehyde emission is reduced.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a flour composition for urea-formaldehyde resin and its preparation method and application. Background technique [0002] For the production of urea-formaldehyde resin adhesives for plywood, 20-30% of the resin content of wheat flour is usually added as a tackifying additive to increase the viscosity of the adhesive, reduce the amount of adhesive, and improve the pre-compression performance of the plywood and the aging resistance of the adhesive layer. Wait. China consumes millions of tons of wheat flour for wood-based panel production every year. [0003] In recent years, some wheat flour substitutes for urea-formaldehyde resin have also appeared on the market. The cost is about 1 / 3 lower than that of wheat flour, but the use effect is poor. When these substitutes are used for the production of plywood and blockboard, the pre-pressing performance is often poor and the bondin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/24C09J197/02C09J101/28C09J103/02C09J11/04
Inventor 吴子良高中海左艳仙莫丽华唐成
Owner 广州市北林林产工业有限公司
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