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Starch-base adhesive and preparation method thereof

An adhesive and starch-based technology, which is applied in the field of starch-based adhesive preparation, can solve the problems of environmental pollution, toxicity and pollution, etc., and achieve the effect of simple preparation method, low cost and improved strength

Inactive Publication Date: 2008-07-09
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, traditional phenolic, urea-formaldehyde and other adhesives are toxic and polluting, and the furniture made after bonding releases a large amount of harmful substances such as formaldehyde, which seriously pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Polyethylene glycol and isocyanate (TDI) were prepared by a one-step method at a molar ratio of NCO:OH=1.5:1 to obtain a waterborne polyurethane prepolymer. After the prepolymer was dispersed in the water system, it was mixed with gelatinized starch in different proportions. The chemical cross-linking reaction is carried out at 50°C, and finally adhesives with different concentrations are obtained.

Embodiment 2

[0021] Polypropylene glycol and isocyanate (HDI) are prepared by a one-step method according to the molar ratio of NCO: OH = 1: 1 to obtain a waterborne polyurethane prepolymer. The chemical cross-linking reaction is carried out at ℃, and finally adhesives with different concentrations are obtained.

Embodiment 3

[0023] Polyester diol and isocyanate (TDI) are prepared by one-step method according to the molar ratio of NCO:OH=1.7:1 to obtain waterborne polyurethane prepolymer. The chemical cross-linking reaction is carried out at 60°C, and finally adhesives with different concentrations are obtained.

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PUM

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Abstract

The invention relates to a starch-based adhesive and a process for preparation, the starch-based adhesive adopts polyatomic alcohols with different molecular weights and isocyanate and prepares to obtain waterborne polyurethane prepolymer through a one-step method according to the mole ratio in the range of proportionality that isocyanate : polyatomic alcohols = 1:1-2:1, and the prepolymer is formed into emulsion adhesive with gelatinized starch or oxygenized starch through chemical crosslinking reaction after the prepolymer is scattered in a water system. The process for preparing the starch-based adhesive of the invention is simple and has low cost, the prepared starch-based adhesive has the characteristics of high adhesive strength, is suitable for adhering bamboo, timber, paper and the like, has good mechanical properties, good water resistance and anti-aging resistance, green environmental protection, degradation and the like, and can be wide used in the fields of agriculture, chemical industry, food, furniture and the like.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a method for preparing a starch-based adhesive with strong cohesive force, environmental protection and low price. Background technique [0002] Water-based adhesives use water as the dispersion medium, are odorless, non-polluting, and are environmentally friendly adhesives. However, with the depletion of non-renewable resources such as petroleum, the price of crude oil continues to rise, and the production cost of synthetic polyurethane is increasing day by day. At the same time, water-based polyurethane also has problems such as lower cohesive energy than polar substrates and weak adhesion. Starch is rich in polar groups, and its molecular structure is very similar to the cellulose structure in bamboo and wood, so it has strong adhesion to wood, paper, etc., and starch is a green renewable resource with low price. [0003] In addition, traditional adhesives such as phenolic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/04C09J175/04
Inventor 刘大刚
Owner SOUTH CHINA AGRI UNIV
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