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Natural macromolecular composite aqueous polyurethane bond and its preparation method

A water-based polyurethane and natural polymer technology, applied in polyurea/polyurethane adhesives, adhesive types, protein adhesives, etc., can solve problems such as poor adhesive strength and water resistance, and achieve improved adhesive performance , Improve the bonding strength and water resistance, the effect of simple process

Inactive Publication Date: 2006-12-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adhesive properties of starch and soybean protein have been used for a long time, but they have the disadvantages of poor adhesive strength and water resistance as adhesives. At present, the main idea is to prepare them with higher application value through physical and chemical modification. starch or soy protein binder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of natural macromolecule composite water-based polyurethane adhesive, it comprises the steps:

[0018] 1). Preparation of water-based polyurethane emulsion: Mix the calculated amount of polyoxypropylene diol (molecular weight 2000, Nanjing Zhongshan Petrochemical) and toluene diisocyanate (TDI, China Pharmaceutical Group Shanghai Chemical Reagent Company) and stir at 65°C for 2 hours , The mass percent of polyoxypropylene diol and toluene diisocyanate is: polyoxypropylene diol 10-35, toluene diisocyanate 65-90. Then add the small molecule chain extender DMPA, the amount of the small molecule chain extender DMPA is 10-50 of the quality of toluene diisocyanate, adjust the temperature to 75 ° C and stir for 1 hour, during which the viscosity is reduced with acetone, the amount of acetone added is 5-10% of solid mass. Add the calculated amount of triethylamine (TEA) for neutralization for 5 minutes. The amount of triethylamine (TEA) added is the same a...

Embodiment 2

[0023] Substantially the same as Example 1, the difference is that: by mass concentration, soybean protein accounts for 50% of the mass percent of all solid components in the aqueous polyurethane emulsion of 90% soybean protein solution and 25% mass concentration, and the aqueous polyurethane accounts for all The mass percent of solid component is 50 and selects soybean protein aqueous solution, water-based polyurethane emulsion; Now soybean protein and water-based polyurethane account for soybean protein and the mass percent of the water-based polyurethane emulsion that mass concentration is 25% is 39.133, and blending makes natural macromolecule Composite water-based polyurethane adhesive. The shear strength (MPa) was 6.68.

Embodiment 3

[0025] Substantially the same as Example 1, the difference is: by soybean protein (that is, the soybean protein aqueous solution of 100% in mass concentration) and the mass concentration of 10% in the water-based polyurethane emulsion, the soybean protein accounts for 75% by mass of all solid components , the water-based polyurethane accounts for 25% by mass of all solid components and selects soybean protein aqueous solution and water-based polyurethane emulsion. At this time, soybean protein and water-based polyurethane accounted for 40% by mass of soybean protein and water-based polyurethane emulsion with a mass concentration of 10%, and were blended to obtain a natural polymer composite water-based polyurethane adhesive. The shear strength (MPa) was 4.81.

[0026] From Examples 1-3, it can be seen that the addition of the water-based polyurethane of the present invention has a certain enhancement on the binding effect of soybean protein, and its shear strength has been imp...

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Abstract

The invention relates the natural high polymer composite water-based polyurethane binder and preparing method. The high polymer composite water-based polyurethane binder comprises 40-100% A water solution and 10-25% water-based polyurethane emulsion. The mass ratio of A mass percent and solid constituent is 20-80%, and the ratio of water-based polyurethane emulsion and solid constituent is 20-80%. The mass ratio of A and water-based polyurethane emulsion is 30-40%. The A comprises fecula, soy protein, modified starch, and modified soy protein. The product has the advantages of high bonding capacity, low cost, biodegradability, environmental protection and simple technology.

Description

technical field [0001] The invention relates to a natural polymer composite water-based polyurethane adhesive and a preparation method thereof, which belongs to the field of natural polymer materials and also belongs to the field of environment-friendly ecological materials. Background technique [0002] Starch is the product of plant photosynthesis and one of the most abundant natural polymer resources. It has the advantages of cheap, renewable and environmentally friendly. Soybean protein is a by-product of soybean oil extraction. It is cheap and has good biological activity and function. Most of it is used in the food industry, and it is also used in the fields of adhesives, degradable plastics and other materials. Recently, due to the increasing shortage of petroleum resources, the continuous rise of crude oil prices and environmental pollution problems, the research and application of natural polymer materials based on renewable resources have been widely valued. The a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/02C09J103/04C09J189/00C09J175/04
Inventor 黄进郑化崔国娟魏铭程铭
Owner WUHAN UNIV OF TECH
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