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A kind of film adhesive and its preparation method and application

An adhesive and film-like technology, which is applied in the direction of film/sheet-like adhesives, adhesives, manufacturing tools, etc., can solve the problems of water absorption swelling, antibacterial, water resistance, production efficiency, etc., to improve production Environment, low moisture content requirements, high cost performance

Active Publication Date: 2022-06-07
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still two problems in the use of soybean protein adhesives: (1) soybean protein is still used as a thickening substance of traditional trialdehyde adhesives, and the coating method is used during use, which affects the production efficiency; (2) soybean protein adhesives As a wood adhesive, its water swelling, antibacterial, water resistance and other problems are always difficult to solve, and it needs to be compounded or modified with other adhesives, such as epoxy resin, isocyanate, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The present embodiment provides a method for preparing a membrane-like soybean protein wood adhesive, the raw materials thereof comprising: IPDI, polycaprolactone, 2,2-dihydroxymethylpropionic acid, triethylamine and soybean protein isolate; The steps include the following:

[0034] Step 1), prepare waterborne polyurethane: take 24g of polycaprolactone into a flask, heat at 80 °C for 1 h to remove moisture, add 9.6 g of IPDI reagent dropwise, and react at 80 °C at a stirring speed of 180 rpm for 3 h, then cool down to 75 °C, add 2,2- 1.6g of dihydroxymethylpropionic acid, reaction 1h, cooled to 50 °C, added 1.2g of triethylamine, reaction 30min, and finally added water 84g, stirred at a speed of 1100rpm for 1h, forming a waterborne polyurethane solution with a solid content of 30%.

[0035] Step 2), take the aqueous polyurethane solution prepared in step 1 of 60g, add 6g of soybean protein isolate in 3 times, and mix evenly (1 min each time) with a homogenizer at high speed ...

Embodiment 2

[0040] The present embodiment provides a method for preparing a membrane-like soy protein wood adhesive, the steps comprising the following:

[0041] Step 1), take 50 g of MDI type water-based polyurethane and 6 g of soybean meal with a solid content of 50%.

[0042] Step 2), 6g of soybean meal is added to the aqueous polyurethane solution in 2 times, and after each addition, the homogenizer is used to mix evenly (2 min each time) at high speed (20000 rad / min) to form a paste.

[0043] Step 3), place the 20cm × 20cm release paper on a flat steel plate, use an applicator to evenly coat the paste in step 2) on the release paper, and the applicator controls the thickness by 1mm.

[0044]Step 4), the uniformly coated adhesive is dried in a 40 °C oven for 24 h to obtain a film-like soy protein wood adhesive. This adhesive can be used in the preparation of plywood.

experiment example 1

[0046] Raw materials: giant tail eucalyptus veneer (1.5mm×250mm×250mm 3 sheets), embodiment 1 in the membrane soy protein wood adhesive.

[0047] Operation steps: take a veneer as the table board, respectively, lay on the embodiment 1 in the film-like soybean protein wood adhesive, take another veneer as the core board, according to the fiber direction and the first veneer perpendicular overlap with each other, again lay a membrane soybean protein wood adhesive, take the third veneer according to its fiber direction and the core board perpendicular and the pine surface and the core board contact overlap, the combination is completed, hot pressing molding; Hot pressing conditions 120 °C, 1.5 MPa, 7 min.

[0048] Plywood prepared in Example 1, after soaking in water at 43 ° C for 3h, its gluing strength is 2.61MPa. After 10 times of water circulation, the glue strength was ≥2.34MPa.

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Abstract

The invention relates to a film-like adhesive and its preparation method and application. The preparation of the film-like adhesive includes: grafting and modifying soybean protein and water-based polyurethane solution to obtain a paste-like mixture, and then coating, drying; wherein the ratio of the soybean protein to the polyurethane solid content is 1:1-1:5. On the basis of the formaldehyde-free adhesive, the invention develops a film-like soybean protein wood adhesive that is convenient for transportation and simple in process.

Description

Technical field [0001] The present invention relates to the field of adhesives, specifically to a film adhesive and preparation method and application thereof. Background [0002] With the improvement of people's living standards and the enhancement of environmental awareness, a series of aldehyde-free adhesives and low-aldehyde adhesives have entered people's field of vision. Among them, formaldehyde-free biological protein glue, polyurethane glue and isocyanate and other adhesives have become the main research objects. [0003] The current status of the art is that most adhesives such as plant protein adhesives are liquid, due to the presence of a large number of water solvents, increasing the transportation costs of adhesives. Soybean protein has the advantages of high yield, renewable, biodegradable and low price, which has attracted widespread attention in the field of scientific materials. At present, soybean protein in this field is often used as a glue tack for plywood be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/10C09J7/30C09J187/00C08G81/00B27D1/08
CPCC09J7/10C09J7/30C09J187/00C08G81/00B27D1/08
Inventor 陈媛范东斌
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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