A kind of aldehyde-free protein adhesive and preparation method thereof

Abstract

The invention discloses a formaldehyde-free protein adhesive and a preparation method thereof, because the formaldehyde-free protein adhesive is composed of the following raw materials: defatted soybean meal protein powder, trypsin, fig protease, dispersion medium water, sodium periodate, three Ethylene tetramine and ethylene glycol diglycidyl ether. Among them, the protein molecule is firstly degraded and then modified and recombined to form a prepolymer, so that the protein is fully stretched, the molecular active group is significantly increased, the reactivity is improved, and it is easy to react with the cross-linking agent, and the solubility and water retention are improved. Therefore, the method of the present invention is adopted The adhesive prepared by the preparation method has high water-resistant bonding performance and high stability; it can meet the water-resistant requirements of wood-based panel adhesives, reduce the amount of cross-linking agent and thereby reduce the cost of the adhesive, and ensure the practicality of the protein adhesive. performance.

Description

technical field

[0001] The invention relates to the technical field of wood-based panel adhesives, in particular to a formaldehyde-free protein adhesive 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 o...

Examples

Embodiment 1

[0040] An aldehyde-free protein adhesive consisting of the following materials by weight:

[0041] Demineralized water 70 kg;

[0042] Defatted soybean meal protein powder 30 kg;

[0043] Trypsin 0.2kg;

[0044] Ficin 0.2kg;

[0045] Sodium periodate 2kg;

[0046] Triethylenetetramine 0.2kg;

[0047] Ethylene glycol diglycidyl ether 0.5kg.

[0048] When the formaldehyde-free protein adhesive in this embodiment is used: mix the formaldehyde-free protein adhesive, water, methylol, isocyanate, epoxy, and polyurethane cross-linking agent, and stir at room temperature for 10 minutes. Stir well.

Embodiment 2

[0050] An aldehyde-free protein adhesive consisting of the following materials by weight:

[0051] Demineralized water 70 kg;

[0052] Defatted soybean meal protein powder 30 kg;

[0053]Trypsin 0.5kg;

[0054] Ficin 0.5kg;

[0055] Sodium periodate 5kg;

[0056] Triethylenetetramine 0.5kg;

[0057] Ethylene glycol diglycidyl ether 1kg.

Embodiment 3

[0059] A preparation method of aldehyde-free protein adhesive, comprising the following steps:

[0060] (1) According to the weight ratio in the above-mentioned formaldehyde-free protein adhesive, weigh each component and prepare raw materials;

[0061] (2) Evenly disperse the defatted soybean meal protein powder, water and trypsin in the dispersion medium water, raise the temperature of the water bath to 40°C, and stir for 30 minutes. When the temperature rises to 80°C, keep warm for 10 minutes and then inactivate the enzyme;

[0062] (3) Cool down the mixture obtained in step 2 to 40°C, add ficin, keep it warm for 15 minutes, and heat up to 80°C to inactivate the enzyme;

[0063] (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 after reacting for 5 hours, react at 50°C for 2 hours, then raise the temperature to 90°C, and react 6 Hour;

[0064] (5) Heat the mixture in step 4 to 90...

technical field

[0001] The invention relates to the technical field of wood-based panel adhesives, in particular to a formaldehyde-free protein adhesive 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 o...

Examples

Embodiment 1

[0040] An aldehyde-free protein adhesive consisting of the following materials by weight:

[0041] Demineralized water 70 kg;

[0042] Defatted soybean meal protein powder 30 kg;

[0043] Trypsin 0.2kg;

[0044] Ficin 0.2kg;

[0045] Sodium periodate 2kg;

[0046] Triethylenetetramine 0.2kg;

[0047] Ethylene glycol diglycidyl ether 0.5kg.

[0048] When the formaldehyde-free protein adhesive in this embodiment is used: mix the formaldehyde-free protein adhesive, water, methylol, isocyanate, epoxy, and polyurethane cross-linking agent, and stir at room temperature for 10 minutes. Stir well.

Embodiment 2

[0050] An aldehyde-free protein adhesive consisting of the following materials by weight:

[0051] Demineralized water 70 kg;

[0052] Defatted soybean meal protein powder 30 kg;

[0053]Trypsin 0.5kg;

[0054] Ficin 0.5kg;

[0055] Sodium periodate 5kg;

[0056] Triethylenetetramine 0.5kg;

[0057] Ethylene glycol diglycidyl ether 1kg.

Embodiment 3

[0059] A preparation method of aldehyde-free protein adhesive, comprising the following steps:

[0060] (1) According to the weight ratio in the above-mentioned formaldehyde-free protein adhesive, weigh each component and prepare raw materials;

[0061] (2) Evenly disperse the defatted soybean meal protein powder, water and trypsin in the dispersion medium water, raise the temperature of the water bath to 40°C, and stir for 30 minutes. When the temperature rises to 80°C, keep warm for 10 minutes and then inactivate the enzyme;

[0062] (3) Cool down the mixture obtained in step 2 to 40°C, add ficin, keep it warm for 15 minutes, and heat up to 80°C to inactivate the enzyme;

[0063] (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 after reacting for 5 hours, react at 50°C for 2 hours, then raise the temperature to 90°C, and react 6 Hour;

[0064] (5) Heat the mixture in step 4 to 90...

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