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A kind of preparation method of aqueous polyurethane

A water-based polyurethane and prepolymer technology, applied in the field of polyurethane, can solve the problems of easy gelation and poor thermal storage stability of polyurethane, achieve good water resistance, solve the contradiction between hydrophilicity and water resistance, and store stability Good results

Active Publication Date: 2016-08-17
BAUHINIA VARIEGATA INK & CHEM (ZHONGSHAN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal storage stability of the polyurethane prepared by the self-crosslinking method is poor, and it is easy to gel after being placed for a period of time.

Method used

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  • A kind of preparation method of aqueous polyurethane
  • A kind of preparation method of aqueous polyurethane
  • A kind of preparation method of aqueous polyurethane

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preparation example Construction

[0021] The embodiment of the present invention discloses a kind of preparation method of waterborne polyurethane, comprises the following steps:

[0022] (A) A prepolymer solution with self-emulsifying property by reacting diisocyanate, polyol, and hydrophilic chain extender under the action of a catalyst;

[0023] (B) adding water to the prepolymer solution to emulsify it, and then reacting with polyamine to obtain waterborne polyurethane;

[0024] The polyamines include at least 10 wt% of polymer amines.

[0025] According to the present invention, firstly, a prepolymer solution is prepared by using diisocyanate, polyol and hydrophilic chain extender as raw materials under the action of a catalyst. The diisocyanate is preferably aliphatic diisocyanate, alicyclic diisocyanate, aromatic diisocyanate, more preferably ethylene diisocyanate, 1,6-hexamethylene diisocyanate, 2,2,4-trimethyl Hexamethylene diisocyanate, 2,6-diisocyanatocaproic acid, isophorone diisocyanate, hydroge...

Embodiment 1

[0036] Add 48.6g of vacuum-dehydrated polycarbonate diol (molecular weight: 1000) and IPDI32.6g into the four-neck flask, heat while stirring, under the protection of nitrogen, completely melt the polycarbonate diol, and raise the temperature to 85°C. Reaction, when the NCO content reaches the theoretical value of 10.1%. Then, 6.5 g of DMPA, 0.1 g of dibutyltin laurate, and 25 g of acetone were added to the reaction container, and reacted at 80° C. for 2 hours. Then, 42 g of acetone was added to obtain a solution of a urethane prepolymer having an NCO group at the end. At this time, the NCO content is 4.7% in terms of solids. This prepolymer is designated A1.

[0037] Add 5.0 g of triethylamine to the prepolymer A1, and then mix it with 344 g of deionized water to obtain an O / W emulsion. Add 50 g of acetone solution of polyamide 651, including 45 g of acetone and 5 g of polyamide 651, mix and stir evenly, raise the temperature to 60° C. after the addition, and continue stir...

Embodiment 2

[0040] Add butylene adipate diol (molecular weight is 1250) 60.9g, IPDI32.6g in the four-necked flask of vacuum dehydration, heat while stirring, under nitrogen protection, make butylene adipate diol Completely melt, heat up to 85°C for reaction, when the NCO content reaches the theoretical value of 8.8%. Then, 6.5 g of DMPA, 0.1 g of dibutyltin laurate, and 25 g of acetone were added to the reaction container, and reacted at 80° C. for 2 hours. Then, 42 g of acetone was added to obtain a solution of a urethane prepolymer having an NCO group at the end. At this time, the NCO content is 4.2% in terms of solids. This prepolymer is designated A2.

[0041] Add 5.0 g of triethylamine to the prepolymer A2, and then mix it with 344 g of deionized water to obtain an O / W emulsion. Add 50g of polyamide 651 and diethylenetriamine-acetone mixed solution, including 45g of acetone, 3g of polyamide 651, and 2g of diethylenetriamine, mix and stir evenly, heat up to 60°C after addition, and...

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Abstract

The invention provides a preparation method for aqueous polyurethane. diisocyanate, polyols and hydrophilic chain extenders are reacted under the action of catalysts, a prepolymer solution with self emulsibility is obtained; the prepolymer solution is added with water for emulsification, then a chain extension reaction is carried out by utilization of polyamines, and aqueous polyurethane dispersions with internal crosslinking are obtained. The polyamines comprise at least above 10wt% of high-molecular amines. Because each molecule of the high-molecular amines contains a plurality of primary amine and secondary amine functional groups, when the high-molecular amines are selected as chain extenders and internal crosslinking agents, the obtained molecules after chain extension have net structures and appropriate crosslinking degree. When the molecules are dried and a compact membrane with good water resistance and storage stability can be formed. By utilization of an internal crosslinking method, the problem of contradiction of hydrophilcity and water resistence of aqueous polyurethane is solved. The aqueous polyurethane can be applied in intaglio printing oil, and can meet the requirements of boiling resistance (100 DEG C / 30min) and steaming resistance (121 DEG C / 30min).

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a preparation method of waterborne polyurethane. Background technique [0002] Polyurethane, or polyurethane, is a general term for polymer materials that contain repeating urethane (-NHCOO-) structures in their molecular chains. Polyurethane is generally made of diisocyanate and diol or polyol as the basic material through polyaddition reaction. Depending on the number of functional groups of the raw materials, it can be made into a polymer with a linear or body structure, which has good mechanical properties and bonding properties. And wear resistance, etc., have been widely used in various fields. [0003] Water-based polyurethane has excellent physical and mechanical properties, does not contain or contains a small amount of volatile organic compounds, is safe in production and construction, basically harmless to the environment and human body, and meets environmental protection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/60C08G18/50C08G18/64C08G18/32C08G18/48C09D11/00C09D175/04C09J175/04
CPCC08G18/0823C08G18/12C08G18/603C08G18/6659C09D11/102C08G18/60C08G18/6529
Inventor 张杰冯文照曾华丽麦允程汪盛藻杨换丽汤多峰刘婕妤
Owner BAUHINIA VARIEGATA INK & CHEM (ZHONGSHAN) LTD
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