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Lignin-based aldehyde-free adhesive and preparation and application method thereof

A technology of lignin-based, aldehyde adhesives, applied in the field of adhesives, can solve problems such as threats to human health, and achieve the effect of solving formaldehyde release, excellent dry strength and wet strength

Inactive Publication Date: 2017-05-31
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Products made of trialdehyde glue will have continuous release of formaldehyde, and formaldehyde is a potential carcinogen, threatening human health
In recent years, lignin has been widely used as a filler for trialdehyde glue, or to replace part of phenol to produce phenolic adhesives, but this has not fundamentally solved the increasingly serious formaldehyde release problem faced by humans.

Method used

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  • Lignin-based aldehyde-free adhesive and preparation and application method thereof

Examples

Experimental program
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preparation example Construction

[0021] The invention provides a method for preparing a lignin-based formaldehyde-free adhesive, comprising the following steps:

[0022] 1) mixing lignin and / or its derivatives, catalyst and water to obtain a reduction system;

[0023] 2) adjusting the pH value of the reduction system to 10-11, and then performing activation treatment, and the obtained activation treatment product includes the upper layer mixed solution and the lower layer precipitate;

[0024] 3) heat-treating the lower precipitate, protein-rich substance and water to obtain a lignin-based formaldehyde-free adhesive.

[0025] In the present invention, lignin and / or its derivatives, catalyst and water are mixed to obtain a reducing system. In the present invention, there is no special requirement on the method of mixing to obtain the reducing system, and the method of mixing materials well known to those skilled in the art can be used for mixing. In the present invention, the mixing is preferably carried out...

Embodiment 1

[0038] The reduction system comprising 100 parts of cellulose ethanol lignin, 0.5 parts of catalyst and 400 parts of water was treated at a stirring rate of 300 rpm and 30 °C for 6 hours; then 3% sodium hydroxide solution was added to adjust the pH value to 10, at 65 Activation at °C for 1 hour.

[0039] The activated product was centrifuged at a rate of 3500rpm to obtain a lower layer of sediment; a mixture of 100 parts of the lower layer of sediment, 20 parts of soybean flour and 150 parts of water was heated at a stirring rate of 370 rpm and 35°C for 1 hour to obtain a lignin-based Formaldehyde-free adhesive.

[0040] The present invention also detects the bonding properties of the adhesive obtained in this embodiment, and the detection results are shown in Table 1.

[0041] The bonding strength of the adhesive that the present embodiment of table 1 obtains

[0042]

[0043] It can be seen from Table 1 that the adhesive obtained in this example has excellent dry streng...

Embodiment 2

[0045] Treat the reducing system containing 100 parts of hydrolyzed lignin, 1.5 parts of catalyst and 600 parts of water at a stirring rate of 270rpm at 40°C for 9 hours; then add 5% potassium hydroxide solution to adjust the pH value to 11, at 75°C Activate for 2 hours.

[0046] The activated product was centrifuged at a rate of 3500rpm to obtain a lower sediment; a mixture of 100 parts of the lower sediment, 40 parts of soybean flour and 400 parts of water was heated at 45°C for 0.5 hours at a stirring rate of 370 rpm to obtain a lignin-based Formaldehyde-free adhesive.

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Abstract

The invention provides a preparation method of a lignin-based aldehyde-free adhesive, comprising the steps: (1) mixing lignin and / or derivatives thereof, a catalyst and water to obtain a reduction system; (2) regulating the pH value of the reduction system to 10-11, then performing activating treatment to obtain an activating treatment product comprising the upper mixed solution and the lower precipitate; and (3) performing heating treatment on the lower precipitate, a protein-rich substance and water to obtain the lignin-based aldehyde-free adhesive. No aldehyde containing materials are introduced in the process of preparing the lignin-based aldehyde-free adhesive, the obtained lignin-based aldehyde-free adhesive can thoroughly solve the problem of formaldehyde release. In addition, the adhesive provided by the invention has excellent dry strength and wet strength, the highest dry strength is 3.081MPa, the highest wet strength after boiling in water of 63DEG C is 0.899MPa, and the highest wet strength after boiling in water of 100DEG C is 1.028MPa.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a lignin-based formaldehyde-free adhesive and a preparation and use method thereof. Background technique [0002] Through the adhesion and cohesion of the interface, the natural or synthetic, organic or inorganic substances that can connect two or more parts or materials together are collectively referred to as adhesives. With the growing of the wood-based panel industry, wood composite materials are widely used in the fields of house construction and home furnishing. For wood composites, the use of adhesives is essential. [0003] However, under the background that wood composite materials are widely used in house construction and home furnishing, etc., which are closely related to human life, the adhesives used are still mainly "trialdehyde" glues, namely urea-formaldehyde resin adhesives and phenolic resin adhesives. and melamine resin adhesive. The products prepared by t...

Claims

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Application Information

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IPC IPC(8): C09J197/00C09J189/00
CPCC09J197/00C08L89/00
Inventor 时君友李之朋徐文彪李翔宇段喜鑫姜天尧
Owner BEIHUA UNIV
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