A kind of formaldehyde-free soybean gum and preparation method thereof

A technology of formaldehyde-free bean gum and aldehyde bean gum, applied in the preparation of animal glue or gelatin, adhesives, non-polymer adhesive additives, etc., can solve the problem of uneven distribution of cross-linked structure of protein adhesives, artificial bonding Formaldehyde release from panels, inability to use wood-based panels for outdoor use, etc., to achieve the effect of increasing types and quantities, decreasing weak interface layer, and improving adhesive performance

CN109504343BActive Publication Date: 2022-01-28BEIJING FORESTRY UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-01-28

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Abstract

The invention discloses a formaldehyde-free bean gum and a preparation method thereof. The formaldehyde-free bean gum is composed of the following raw materials in parts by weight: soybean meal powder, trypsin, soybean shell polysaccharide enzyme, dispersion medium water, sodium periodate, triethylene tetra Amines, Glycol Diglycidyl Ether and Hardener. The advantages of the formaldehyde-free soybean gum prepared by the present invention are that the soybean meal molecules are firstly degraded and then modified and recombined to form a prepolymer, so that the protein is fully stretched, the molecular active groups are significantly increased, the reactivity is improved, and the solubility and water retention are improved. The adhesive prepared after the curing agent has high water-resistant bonding performance and high stability; it can meet the water-resistant requirements of the wood-based panel adhesive, reduce the amount of cross-linking agent and reduce the cost of the adhesive, and ensure the practical performance of the protein adhesive.
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Description

technical field

[0001] The invention relates to the technical field of wood-based panel adhesives, in particular to a formaldehyde-free bean gum and a preparation method thereof. Background technique

[0002] my country is short of precious wood resources, but there are abundant plantation forest resources. The wood-based panels prepared by using plantation fast-growing wood and agricultural and forestry processing residues through adhesives are the main raw materials for furniture floors and interior decoration in the living environment. In 2016, The total output of wood-based panels in my country is 320 million cubic meters, accounting for about 50% of the world's total output. Based on the average production of 9 cubic meters of wood-based panels per ton of adhesive, the consumption of wood adhesives in my country in 2015 was about 40 million tons (solid content 50%), of which urea-formaldehyde resin and its modified products accounted for 20% of the total output of adhesi...

Examples

Embodiment 1

[0046] A formaldehyde-free soybean gum, consisting of the following raw materials by weight:

[0047] Demineralized water 70kg;

[0048] Soybean meal protein powder 35kg;

[0049] Trypsin 0.1kg;

[0050] Soybean chitinase 0.1kg;

[0051] Sodium periodate 2kg;

[0052] Triethylenetetramine 0.2kg;

[0053] Ethylene glycol diglycidyl ether 0.3kg;

[0054] Curing agent 0.3kg.

[0055] When using the formaldehyde-free bean gum in this embodiment: Stir the bean gum prepolymer and the curing agent at room temperature for 10 minutes, and stir evenly before use.

Embodiment 2

[0057] A formaldehyde-free soybean gum, consisting of the following raw materials by weight:

[0058] Demineralized water 70kg;

[0059] Soybean meal protein powder 35kg;

[0060] Trypsin 0.3kg;

[0061] Soybean chitinase 0.3kg;

[0062] Sodium periodate 5kg;

[0063] Triethylenetetramine 0.5kg;

[0064] Ethylene glycol diglycidyl ether 0.8kg;

[0065] Curing agent 0.8kg.

Embodiment 3

[0067] A preparation method of formaldehyde-free bean gum, comprising the following steps:

[0068] (1) According to the weight ratio in the above-mentioned formaldehyde-free soybean gum, weigh each component and prepare raw materials;

[0069] (2) Evenly disperse the soybean meal powder, water and trypsin in the dispersion medium water, raise the temperature of the water bath to 40°C, stir for 30 minutes, then raise the temperature to 80°C for 10 minutes to inactivate the enzyme;

[0070] (3) Cool down the mixture obtained in step 2 to 40°C, add chitosinase, keep it warm for 15 minutes, then raise the temperature to 80°C to kill the enzyme;

[0071] (4) Add sodium periodate to the mixture obtained in step 3, raise the temperature to 50°C, adjust the pH value to 4.0, add triethylenetetramine to react at 50°C for 2 hours after reacting for 5 hours, then raise the temperature to 90°C, and react for 6 hours ;

[0072] (5) Heat up the mixture in step 4 to 80°C, adjust the pH val...