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Preparation method of blocked isocyanate modified soybean protein wood adhesive

A technology for blocking isocyanate and wood adhesive, applied in the field of wood adhesive, can solve the problems of high production cost, short pot life, complicated process, etc., and achieve the effects of improving water resistance, prolonging pot life and slowing down the reaction rate

Inactive Publication Date: 2017-07-25
ANHUI FUYANG QINGLIN WOOD PROD CO LTD
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AI Technical Summary

Problems solved by technology

Therefore, in the development and research of environmental-friendly wood adhesives, it has great potential, but at the same time it also has the disadvantages of high production cost, complicated process and short pot life, which makes its application in the wood-based panel industry restricted. limit

Method used

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Embodiment Construction

[0021] A preparation method of a blocked isocyanate modified soybean protein wood adhesive, comprising the following process steps:

[0022] (1) Ultrasonic alkaline degradation treatment of soybean protein:

[0023] Add 55 parts by weight of 50% NaOH solution and 380 parts of distilled water into a reaction kettle with a stirrer, slowly add 230 parts of soybean protein powder while stirring, and place it in an ultrasonic cell pulverizer Inside, the ultrasonic probe is inserted into the liquid about 2cm, and the operation mode of 5s working time and 5s intermittent time is used for ultrasonic treatment to obtain the degraded soybean protein liquid;

[0024] (2) Capping reaction of diisocyanate:

[0025] Add 60 parts of diphenylmethane diisocyanate into a four-port reactor with agitator, place it in a constant temperature water bath at 60°C, add 120 parts of blocking agent solution dropwise using a constant pressure dropping funnel, and turn on the agitator. And pass into nitr...

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Abstract

The invention discloses a preparation method of a blocked isocyanate modified soybean protein wood adhesive. The active end-NCO of diisocyanate is blocked by using a small molecular end-capping reagent, so that the reaction rate of -NCO base and soybean proteins is alleviated, and the potlife of the isocyanate modified soybean protein wood adhesive is prolonged. After the adhesive is deblocked in a high-temperature condition, -NCO base restores in activity and can be crosslinked with the degraded soybean proteins and wood to for a uniform spatial netty structure, so that the cohesion strength of the structure is increased, a stable chemical bond is formed on the surface of the soybean proteins and wood, and therefore, water resistance of the soybean protein based adhesive is improved.

Description

technical field [0001] The invention relates to the field of wood adhesives, in particular to a preparation method of a blocked isocyanate-modified soybean protein wood adhesive. Background technique [0002] At present, the commercially available wood adhesives are still mainly formaldehyde-based adhesives (urea-formaldehyde resin, phenolic resin and melamine-formaldehyde resin). During the process, free formaldehyde, free phenol and other harmful substances will be released, which will cause great harm to human health. At the same time, the raw materials for preparing such adhesives come from non-renewable petroleum resources. With the continuous reduction of global oil resources and the increasing improvement of environmental protection regulations, environmentally friendly wood adhesives made from renewable biomass resources have received widespread attention. Among them, soybean protein (PSP) is rich in resources, With the advantages of renewable and environmental prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/80C08G18/64C09J175/04C07K1/12
CPCC08G18/8064C07K1/12C08G18/6446C08G18/808C09J175/04
Inventor 汤瀚袁京金贺祖高唱段曙光
Owner ANHUI FUYANG QINGLIN WOOD PROD CO LTD
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