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Preparation method of waterborne polyurethane emulsion modified by natural monosaccharide compound

A water-based polyurethane and compound technology, applied in the field of polymer chemical materials, can solve the problems of poor thermodynamic properties and low hardness of the adhesive film, and achieve the effects of low production cost, improved initial viscosity and stable product properties.

Inactive Publication Date: 2015-04-29
HUIZHOU RES INST OF SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example Lai Xiaojuan (CN101845133A) discloses a kind of preparation method of natural polyhydroxy compound modified water-based polyurethane emulsion; Wang Xinbo (CN101429417A) discloses a kind of highly adhesive water-based polyurethane adhesive that adopts aliphatic isocyanate synthesis; CN1350016A) discloses a kind of water-containing adhesive containing polyurethane water dispersion, these water-based polyurethanes all have certain cohesiveness, but all can't avoid the characteristics such as poor thermodynamic performance of adhesive film and water resistance, solvent resistance, hardness are lower

Method used

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  • Preparation method of waterborne polyurethane emulsion modified by natural monosaccharide compound

Examples

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Embodiment 1

[0024] (1) Add polycarbonate diol into a dry reactor, heat to melt the polyglycol in the reaction bottle, vacuumize and remove water at 120°C for 1 hour, then cool down to 80°C, dihydroxypropionic acid Add it into the reaction flask and stir for 10 min, then add isophorone diisocyanate into the reaction flask, and react at 80° C. for 4 h under the protection of nitrogen. Wherein the ratio of the amount of substance of isophorone diisocyanate and polycarbonate diol is 2:1, and the ratio of the amount of substance of dihydroxypropionic acid and polycarbonate diol is 3:100;

[0025] (2) Add the chain extender 1,4-butanediol to the reaction for 1 hour, then add fructose (dissolved in DMF) into the reactor, and react at 70°C for 3 hours, in which 1,4-butanediol and polycarbonate binary Alcohol is 0.5:1, and the ratio of the amount of fructose to polycarbonate diol is 1:1;

[0026] (3) Cool the reaction to 25°C, add triethylamine to adjust the pH value of the reaction to 7.5, add d...

Embodiment 2

[0028] (1) Add polybutylene adipate diol into a dry reactor, heat to melt the polyglycol in the reaction bottle, vacuumize at 120°C to remove water for 1 hour, and then cool down to 70°C , add dihydroxypropionic acid into the reaction flask and stir for 10min, then add isophorone diisocyanate and hexamethylene diisocyanate, and react at 70°C for 4h under nitrogen protection, wherein dihydroxypropionic acid and polybutylene adipate The ratio of the amount of substance of ester diol is 4:100, the ratio of the amount of substance of diisocyanate to polybutylene adipate is 1.6:1, and the ratio of isophorone diisocyanate to hexamethylene diisocyanate The ratio of the amount of substances is 1:1;

[0029] (2) Add the chain extender 1,4-butanediol to react for 0.5h, then add fructose (dissolved in DMF) into the reactor, and react at 70°C for 3h, in which 1,4-butanediol and polyadipic acid Butylene glycol ester glycol is 0.8:1, and the ratio of the amount of fructose and polybutylene...

Embodiment 3

[0032] (1) Add polybutylene adipate diol into a dry reactor, heat to melt the polyglycol in the reaction bottle, vacuumize at 120°C to remove water for 1 hour, and then cool down to 70°C , add dihydroxypropionic acid into the reaction flask and stir for 10min, then add isophorone diisocyanate and hexamethylene diisocyanate, and react at 70°C for 4h under nitrogen protection, wherein dihydroxypropionic acid and polybutylene adipate The ratio of the amount of substance of ester diol is 3:100, the ratio of the amount of substance of diisocyanate to polybutylene adipate is 2:1, and the ratio of isophorone diisocyanate to hexamethylene diisocyanate The ratio of the amount of substances is 1:1;

[0033] (2) Add the chain extender 1,4-butanediol to react for 0.5h, then add fructose (dissolved in DMF) into the reactor, and react at 70°C for 3h, in which 1,4-butanediol and polyadipic acid Butylene glycol ester glycol is 0.8:1, and the ratio of the amount of fructose and polybutylene a...

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Abstract

The invention discloses a preparation method of a waterborne polyurethane emulsion modified by a natural monosaccharide compound. The preparation method comprises the following steps: firstly, adding polyglycol to a dry reaction bottle, heating to melt the polyglycol in the reaction bottle and vacuumizing to removal water for 1 hour at 120 DEG C; next, adding a hydrophilic reagent, a chain extender and diisocyanate to the reaction bottle to have a polymerization reaction, thereby obtaining a polyurethane prepolymer; next, adding the natural monosaccharide compound for reacting, cooling after a period of time, and adding an organic base to regulate the pH value of the reaction; and adding deionized water under high speed stirring for emulsifying, and removing the solvent by virtue of reduced pressure distillation, thereby obtaining the waterborne polyurethane emulsion modified by the natural monosaccharide compound. According to the preparation method, the waterborne polyurethane is modified by use of the natural monosaccharide, and the product has excellent overall properties, and also is environment-friendly, harmless, cheap and the like. The coating of the product can be just thermally decomposed at 300 DEG C; compared with the polyurethane before modification, the heat resistance of the modified polyurethane is obviously improved, and meanwhile, the water tolerance of the modified polyurethane is also greatly improved.

Description

technical field [0001] The invention belongs to the field of macromolecular chemical materials, and in particular relates to a preparation method of a natural monosaccharide compound modified water-based polyurethane emulsion. Background technique [0002] Polyurethane is a multifunctional polymer material with various raw materials and adjustable molecular structure. It is widely used in many fields such as foam plastics, elastomers, adhesives, and coatings. Polyurethane material has excellent flexibility, impact resistance, solvent resistance, and its wear resistance and low temperature resistance are particularly excellent. At present, there are two types of polyurethane materials: solvent-based and water-soluble. Generally speaking, solvent-based polyurethane is made of acetone, methyl ethyl ketone, toluene, etc. as the main solvent through solution polymerization. There are great health hazards. With the progress of society and the development of science and technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/44C08G18/48C08G18/32C08G18/34C08G18/12C08J3/03
CPCC08G18/6659C08G18/0823C08G18/12C08G18/3206C08G18/3218C08G18/348C08G18/4238C08G18/4277C08G18/44C08G18/664C08G18/6644C08J3/03C08J2375/06
Inventor 纪红兵吴海波叶超
Owner HUIZHOU RES INST OF SUN YAT SEN UNIV
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