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Production method of starch-based formaldehyde-free glue

A production method, technology of formaldehyde-free adhesive, applied in adhesives, grafted polymer adhesives, adhesive types, etc., can solve the problems of low bonding strength, poor water resistance, difficult operation, etc., and achieve high bonding strength , high water resistance, good storage stability

Active Publication Date: 2012-08-15
北京美庭环保科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Starch-based adhesives are cheap, fast-drying, and simple in production process, but traditional starch adhesives have poor water resistance and low bonding strength, and can still be used for textile and paper bonding, but cannot be used for wood bonding
[0003] "A formaldehyde-free adhesive and its use" announced by CN102268232A and "formaldehyde-free adhesive for wood-based panels" announced by CN1884414A are both two-component adhesives, using isocyanate as a reinforcing agent, which has high cost and difficult operation
CN1313555C announced the "formaldehyde-free adhesive for wood-based panels" of Nanjing Forestry University, and the antifungal agent used in its starch-based adhesive is sodium pentachlorophenate, which is highly toxic and harmful to the environment

Method used

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Embodiment Construction

[0012] The present invention is described in detail below in conjunction with embodiment:

[0013] The production method of this starch-based formaldehyde-free glue is carried out as follows:

[0014] (1) Preparation of oxidized starch emulsion: add 100 kg of oxidized starch and 400 kg of water into the reaction kettle, and stir to form a starch emulsion;

[0015] (2) Activation of oxidized starch emulsion: adjust the pH value to 9-10 with lye, then add 2.5 kg of potassium persulfate aqueous solution with a mass ratio of 10%, and stir for 20 minutes;

[0016] (3) Grafting reaction of oxidized starch: heat up to 50°C after step (2), slowly add 5 kg of aqueous epichlorohydrin solution with a mass ratio of 4% and 30 kg of styrene, stir for 1 hour and then add 2.5 Kilogram mass ratio is 10% potassium persulfate aqueous solution, insulation reaction 2 hours;

[0017] (4) Complexation and crosslinking reaction of oxidized starch: Add 100 kilograms of polyvinyl alcohol aqueous solu...

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Abstract

The invention relates to a production method of starch-based formaldehyde-free glue, which takes starch as a main material, uses epoxy chloropropane, styrene, a potassium peroxydisulfate aqueous solution, a polyvinyl alcohol aqueous solution, sodium dodecyl benzene sulfonate (SDBS), an ammonium persulfate aqueous solution, vinyl acetate, acrylamide, a borax aqueous solution, urea and tributyl phosphate as raw materials and takes a NaOH aqueous solution as a pH regulator; and the formaldehyde-free glue can be produced by four steps of: preparation of oxidized starch emulsion, activation, grafting reaction as well as complexing and cross-linking reaction, and can be used as a wood adhesive. The method is mild in reaction conditions, easy to control, high in storage stability and strong in water resistance, and does not release free formaldehyde, thus greatly improving the bonding strength of a starch adhesive.

Description

technical field [0001] The invention relates to a method for producing an organic adhesive, in particular to a method for producing an formaldehyde-free adhesive based on starch. Background technique [0002] In order to save wood, the production of wood-based panels promotes the development of adhesive production. For many years, the leading glue types of wood adhesives are urea-formaldehyde glue, phenolic glue and melamine-formaldehyde glue. The cost of raw materials for adhesives is rising, and the volatilization of free aldehydes and free phenols is harmful to the environment. The demand for the production of formaldehyde-free adhesives is increasing day by day. Starch-based adhesives are cheap, fast-drying, and simple in production process, but traditional starch adhesives have poor water resistance and low bonding strength, and can still be used for textile and paper bonding, but cannot be used for wood bonding. [0003] "A formaldehyde-free adhesive and its use" publ...

Claims

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Application Information

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IPC IPC(8): C09J151/02C09J151/00C09J11/06
Inventor 于红卫
Owner 北京美庭环保科技有限公司
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