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PEI-g-HBA prepolymer and vegetable protein composite modified adhesive as well as preparation method and application thereof

A plant protein and composite modification technology, applied in the field of wood adhesives, can solve the problems of poor initial viscosity and low water resistance, and achieve the effects of low manufacturing cost, high water resistance and convenient operation

Active Publication Date: 2019-03-01
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a PEI-g-HBA prepolymer vegetable protein composite modified adhesive and its preparation method and application, the adhesive can solve the common problems of low water resistance and initial It can completely meet the pre-pressing effect in the production of wood-based panels. It is an environmentally friendly adhesive with excellent performance, especially suitable for adhesives for veneer-based wood-based panels.

Method used

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  • PEI-g-HBA prepolymer and vegetable protein composite modified adhesive as well as preparation method and application thereof
  • PEI-g-HBA prepolymer and vegetable protein composite modified adhesive as well as preparation method and application thereof

Examples

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preparation example Construction

[0045] The preparation method of PEI-g-HBA prepolymer used below comprises the steps:

[0046] (1) In a reaction kettle equipped with a stirrer, under the protection of nitrogen bubbling, add polyethyleneimine (PEI), 3,4-dihydroxybenzaldehyde (DBA) and water, and add NaBH dropwise 3 CN, adjust the pH value to 5.0-6, react at room temperature for 6.5h, and stir evenly;

[0047] (2) The reaction is finished, and the product is taken, and a certain amount of dehydrated alcohol and water are used to wash 3 times until it is cleaned;

[0048] (3) The product obtained in step (2) was vacuum-dried at 50° C. for 24 hours, and discharged to obtain a PEI-g-HBA prepolymer.

[0049] The defatted vegetable protein meal powder used below is defatted soybean meal powder, which has a particle size of more than 100 mesh, a crude protein content of 33-45%, and sugars in varying amounts, which are commercially available.

Embodiment 1

[0051] A PEI-g-HBA prepolymer vegetable protein composite modified adhesive comprises the following components: 75Kg of tap water, 25Kg of defatted vegetable protein meal powder, and 1.3kg of PEI-g-HBA prepolymer.

[0052] The preparation method comprises the following steps:

[0053] S1: In a reaction kettle equipped with a stirrer, a thermometer and a condensing device, add water and defatted vegetable protein meal (powder) according to the proportion and stir evenly; the reaction is carried out at room temperature;

[0054] S2: Add PEI-g-HBA prepolymer according to the proportion and stir evenly to prepare vegetable protein mucilage;

[0055] S3: The obtained vegetable protein slime is processed through a colloid mill and a homogenizer, and the pressure of the homogenization processing is 25 MPa.

[0056] Three batches of parallel samples were prepared by the same process, and the performance and quality indicators of the obtained adhesives are shown in Table 1.

Embodiment 2

[0058] A PEI-g-HBA prepolymer vegetable protein composite modified adhesive comprises the following components: 65Kg of tap water, 30Kg of defatted vegetable protein meal powder, and 2.4kg of PEI-g-HBA prepolymer.

[0059] The preparation method is the same as in Example 1.

[0060] Three batches of parallel samples were prepared in the same way, and the performance and quality indicators of the prepared adhesive are shown in Table 1.

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Abstract

The invention provides a PEI-g-HBA prepolymer and vegetable protein composite modified adhesive as well as a preparation method and an application thereof. The composite modified adhesive is preparedfrom main effective components as follows: vegetable protein meal and a PEI-g-HBA prepolymer. In order to meet the prepress requirement, the PEI-g-HBA component in the adhesive has the structure similar to that of mussel attachment protein DOPA, the prepress requirement of veneers with the moisture content larger than 20% can be met, and bonding strength of manufactured artificial boards can meetthe national standard requirement. The adhesive has the advantages of being simple to manufacture, low in cost, environmentally friendly, pollution-free and the like, the artificial boards adhered bythe adhesive have no formaldehyde release problem, and the problem of formaldehyde in indoor air due to the artificial boards is completely solved.

Description

technical field [0001] The invention belongs to the field of wood adhesives, and in particular relates to a preparation method and application of a high pre-pressed vegetable protein adhesive. Background technique [0002] At present, the manufacturing process of wood-based panels is mainly based on three-aldehyde adhesives, which lead to the release of toxic and harmful gases such as formaldehyde and phenol during the production of adhesives, the manufacture of wood-based panels and the use of products, causing environmental pollution and seriously threatening people's health. healthy. The main raw materials of trialdehyde adhesives come from non-renewable resources such as coal and petroleum; with the gradual depletion of fossil resources and people's increasing attention to environmental protection issues, research, development and use of raw materials for renewable and environmentally friendly wood adhesives have become the focus of this field in recent years. Let's stu...

Claims

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Application Information

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IPC IPC(8): C09J189/00C09J179/02C09J161/22
CPCC09J189/00C08L79/02C08L61/22
Inventor 张世锋王钟赵叔军
Owner BEIJING FORESTRY UNIVERSITY
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