Method for preparing acrylate-modified anionic polyurethane composite emulsion

An anionic, composite emulsion technology, applied in the direction of graft polymer adhesives, adhesive types, textiles and papermaking, etc., can solve problems such as poor adhesion performance, poor stability of composite emulsions, environmental pollution, etc. Adhesive performance, excellent performance, cost reduction effect

Inactive Publication Date: 2012-01-11
NANTONG GAOMENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a method for preparing an acrylate-modified anionic polyurethane composite emulsion, which can solve the environmental pollution caused by the use of organic solvents in the preparation of polyurethane composite emulsions by existing methods, and the prepared composite emulsion has poor stability and poor bonding performance. Poor and coating appearance is not good and other problems

Method used

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Examples

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preparation example Construction

[0012] Embodiments of the present invention provide a method for preparing an acrylate-modified anionic polyurethane composite emulsion, the method comprising the following steps:

[0013] a. Add polymer diol and carboxyl-containing organic hydroxyl compound into the reaction kettle, heat until completely dissolved, cool down to 60°C, add isocyanate, keep constant temperature at 80-90°C, and react for 2-4 hours;

[0014] b. Add hydroxyl-containing acrylate monomers to the reaction kettle in step a, react at 60-80°C for 1-3 hours, and reduce the viscosity of the reaction system by continuously adding the first part of acrylate monomers during the reaction ;

[0015] c. Lower the temperature of the reaction kettle after the reaction in step b to below 40°C, add the second part of the second part of acrylic monomer and the initiator into the reaction kettle, stir evenly, and then add an appropriate amount of neutralizing agent for neutralization After 10-30 minutes, add deionize...

Embodiment 1

[0031] This embodiment provides a kind of preparation method of acrylate modified anionic polyurethane composite emulsion, can prepare a kind of polyurethane composite emulsion, this method comprises the following steps:

[0032] a. First, add 100 parts by weight of polyester diol with a molecular weight of 2000 and 7 parts by weight of dimethylol propionic acid into the reaction kettle, heat until completely dissolved, cool down to 60°C and add 23 parts by weight of diphenylmethane -4,4-diisocyanate, keep constant temperature 80~90℃, react for 2h~4h;

[0033] b. Add 7 parts by weight of hydroxyethyl methacrylate to the reaction kettle in step a, and react at 70°C for 1h to 3h. 10 parts by weight of butyl acrylate) to reduce the viscosity of the reaction system;

[0034] c. Cool the reaction kettle after step b to 40°C, add 12 parts by weight of methyl methacrylate (ie the second part of acrylate monomer) and 0.5 parts by weight of the initiator AIBN, and then add 4.9 The ne...

Embodiment 2

[0037] This embodiment provides a kind of preparation method of acrylate modified anionic polyurethane composite emulsion, can prepare a kind of polyurethane composite emulsion, this method comprises the following steps:

[0038] a. First add 100 parts by weight of polyether diol with a molecular weight of 2000 and 8 parts by weight of dimethylol butyric acid into the reactor, heat until completely dissolved, and add 40 parts by weight of isophorone di For isocyanate, keep a constant temperature of 90°C and react for 2h to 4h;

[0039]b. Add 7 parts by weight of hydroxyethyl methacrylate to the reaction kettle of step a, and react at 75° C. for 1.5 h. During the reaction, butyl acrylate is continuously added (i.e., the first part of acrylate monomer, adding 12 The butyl acrylate of weight part) to reduce the viscosity of reaction system;

[0040] c. Cool down to below 40°C, then add 8 parts by weight of butyl acrylate (that is, the second part of acrylate monomer) and 0.15 pa...

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Abstract

The invention discloses a method for preparing an acrylate-modified anionic polyurethane composite emulsion, belonging to the technical field of adhesive preparation. The method disclosed by the invention comprises the following steps: carrying out polymerization on isocyanate and polymer dihydric alcohol through replacing an organic cosolvent used in the traditional polyurethane preparation process with an acrylate monomer so as to obtain a hydroxyl-obtaining polyurethane prepolymer; after cooling, introducing a proper amount of acrylate monomer and an initiator; and further initiating the polymerization of the acrylate monomer under the action of the initiator after neutralization and water dispersion so as to prepare the acrylate-modified anionic polyurethane composite emulsion. The method disclosed by the invention has the advantages that through taking the acrylate monomer as a solvent in the process of reaction without any organic cosolvent, the real environmental friendliness is achieved; the cost is lowered, and the adhesive performance of a water-gel and the appearance performance of a coating are improved; and no emulsifying agent is required to be added in the process of emulsion preparation, and the prepared product is excellent in performance, can be used in the field of composite adhesives and can also be used in fabric coatings.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a method for preparing an acrylate-modified anionic polyurethane composite emulsion. Background technique [0002] At present, most water-based PU (water-based polyurethane composite emulsion) is mainly prepared by self-emulsification method. There is no doubt that water-based PU has the advantages of non-toxic, cheap, safe and non-combustible, but its molecular structure contains hydrophilic groups. It has the disadvantages of insufficient water resistance and solvent resistance of the coating film, and its price is relatively high, so its application is limited. However, some simple acrylate laminating adhesives contain small molecule emulsifiers, which move to the surface in the product and latex, reducing the physical properties of the product such as water resistance and bonding strength, and due to its high viscosity, poor fluidity and instability , which brings a lot of inconveni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08G18/67C08G18/65C08G18/66C09J151/08D06M15/21
Inventor 张娜沈峰
Owner NANTONG GAOMENG NEW MATERIAL
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