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A kind of preparation method of viscous water-based polyurethane dispersion

A technology of waterborne polyurethane and stickiness, which is applied in the field of sticky waterborne polyurethane dispersion and its preparation, which can solve the problems of uncoordinated initial tack, stickiness and peel strength, difficulty in microphase separation in the emulsification stage, and excessive proportion of soft segment Large and other problems, to achieve the effect of excellent initial tack, strong cohesion, and high peel strength

Inactive Publication Date: 2018-07-24
平顶山正植科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The special soft / hard segment core-shell structure of waterborne polyurethane makes the product performance rich and varied, but the current technology cannot coordinate the initial tack, stickiness and peel strength well, and the excessive proportion of the soft segment can easily lead to difficulty in microphase separation in the emulsification stage , the emulsion system is unstable or even demulsified

Method used

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  • A kind of preparation method of viscous water-based polyurethane dispersion
  • A kind of preparation method of viscous water-based polyurethane dispersion
  • A kind of preparation method of viscous water-based polyurethane dispersion

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preparation example Construction

[0034] A kind of preparation method that keeps viscous aqueous polyurethane dispersion comprises the steps:

[0035] (1) Add hyperbranched active polymer, isocyanate and hydrophilic chain extender into the three-necked flask, heat up and stir to obtain hard shell layer prepolymer;

[0036] (2) Add macromolecular polyol, isocyanate, hydrophilic chain extender and catalyst into the three-necked flask, and stir and react at a certain temperature to obtain a viscous core prepolymer;

[0037] (3) in the there-necked flask, the prepolymer prepared by (1) is mixed with the prepolymer prepared by (2), and the two prepolymers are grafted to obtain the prepolymer of the graft network;

[0038] (4) After cooling the prepolymer of the grafted network prepared in (3) to a certain temperature in a three-necked flask, quickly add deionized water to carry out high-speed shear dispersion and emulsification, the rotation speed is greater than 1500rpm, and then add an appropriate amount of small...

Embodiment 1

[0041] A kind of preparation method of sticky aqueous polyurethane elastic dispersion comprises the steps:

[0042] (1) Add 10 g of hyperbranched polyester polyol [Formula (I)] (Shanghai Xibao Biotechnology Co., Ltd.) into the three-necked flask, and after the temperature of the polyol in the flask is lowered to 10°C, add diphenylmethane diphenylmethane under stirring. Isocyanate (Shanghai Huntsman Polyurethane Co., Ltd.) 10g and sodium ethylenediaminoethanesulfonate ((Degussa)) 0.5g, the temperature of the reactant was controlled at 20°C and stirred for 1h to obtain a hard shell layer prepolymer;

[0043] (2) Add 410g of polyether diol (weight average molecular weight 2000, Shandong Bluestar Dongda Chemical Industry Co., Ltd.) and 41g of 1,6-hexamethylene diisocyanate (Shanghai Chunxiao Biotechnology Co., Ltd.) into the three-necked flask, and heat up under stirring After reacting at 60°C for 5 minutes, add 0.082 g of stannous octoate (Beijing Yili Chemical Company, C.P.), an...

Embodiment 2

[0047] A kind of preparation method of aqueous polyurethane elastic dispersion comprises the steps:

[0048] (1) 10 g of hyperbranched polyester polyol [formula (II)] (Shanghai Xibao Biotechnology Co., Ltd.) was added to the three-necked flask, and after the temperature of the polyol in the flask was lowered to 10° C., p-phenylene diisocyanate ( Shanghai Shanji Chemical Co., Ltd.) 24g, heated up to 26°C and reacted for 25 minutes, then added 1.8g of dimethylol butyric acid (Shanghai Yanyu Bioengineering Co., Ltd.) and continued to react for 47 minutes to form a hard shell prepolymer;

[0049] (2) Add 238.6g of polyester diol (weight average molecular weight 3000, Qingdao Xinyutian Chemical Co., Ltd.) and 71.6g of isophorone diisocyanate (Pastor Company) into the three-necked flask, and heat up to 110°C for reaction under stirring. After 10 minutes, add 0.0716 g of dibutyltin dilaurate (Beijing Yili Chemical Company, C.P.), and after stirring evenly, dissolve 4.7 g of dimethyl ...

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Abstract

The invention discloses a preparing method for persistent viscosity waterborne polyurethane dispersoid. The method includes the following steps of 1 synthesizing hard shell layer prepolymer, wherein a hyperbranched active polymer, isocyanate and a hydrophilic chain extender react to obtain the hyperbranched active prepolymer; 2, synthesizing a viscous core prepolymer, wherein macromolecule polyhydric alcohol, isocyanate and a hydrophilic chain extender react under the action of a catalyst to prepare the hyperbranched active prepolymer; 3, grafting the core-shell prepolymers, wherein the prepolymer prepared in the step 1 and the prepolymer prepared in the step 2 are mixed to react; 4, preparing the persistent viscosity dispersoid, wherein after deionized water is added, the prepolymer of the grafted network prepared in the step 3 is dispersed at a high speed to be emulsified, an appropriate amount of micromolecule amine is added according to needs to further conduct a chain extension reaction to obtain the product finally. The product prepared through the method has excellent initial viscosity, persistent viscosity, peeling strength, water tolerance and ethanol tolerance and is high in cohesion, and no adhesive residue exists after a matrix is peeled.

Description

technical field [0001] The invention relates to a viscous water-based polyurethane dispersion and a preparation method thereof, in particular to a viscous water-based polyurethane dispersion suitable for soft substrates such as paper, cloth and plastics and a preparation method thereof. Background technique [0002] As an emerging organic synthetic material, water-based polyurethane has superior comprehensive performance and strong designability of molecular structure. With the continuous improvement of preparation technology, it has surpassed other water-based polymers in terms of film formation, aging resistance, friction resistance, and strength. The material has incomparable advantages over other water-based polymer materials in terms of air permeability, flexibility, hand feeling, etc. It is gradually replacing solvent-based polyurethane materials. [0003] Compared with water-based acrylic adhesive, water-based polyurethane adhesive has good compatibility with various...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/66C08G18/48C08G18/38C08G18/65C08G18/64C08J3/03
CPCC08G18/3855C08G18/4018C08G18/42C08G18/4236C08G18/4277C08G18/4804C08G18/4833C08G18/64C08G18/6541C08G18/6659C08G18/6662C08G18/6692C08G18/6696C08J3/03C08J2375/04
Inventor 王三合马占山
Owner 平顶山正植科技有限公司
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