Inner crosslinking type caster oil-based waterborne polyurethane emulsion and preparation method thereof

A water-based polyurethane and castor oil-based technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve problems such as low cross-linking activity and unsatisfactory cross-linking efficiency, and achieve The effect of high elongation at break, reduction of high energy consumption and complicated steps, and improvement of crosslinking efficiency

Inactive Publication Date: 2016-12-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional low-functionality small-molecule cross-linking agents have low cross-linking activity and unsatisfactory cross-linking efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, the preparation of internal crosslinking castor oil-based aqueous polyurethane emulsion

[0041]Add 12g of polytetrahydrofuran ether glycol (PTMG-2000) and 12g of castor oil (CO) into the reaction reactor (wherein, the mass ratio of PTMG-2000 and CO is 1:1), and remove water under reduced pressure and vacuum at 120°C 1.5h, when the temperature of the system drops to 70°C, add 17.6g of isophorone diisocyanate (IPDI) and 0.0192g of phosphoric acid, the R value is 1.2, and react at 80°C for 2h under the protection of dry nitrogen; : Cool down to 75°C), add 2.2g of dimethylolpropionic acid (DMPA, small molecule chain extender) and 0.0144g of dibutyltin dilaurate (DBTDL, catalyst), and continue to react at a constant temperature of 80°C for about 1.5h.

[0042] Heat up to 85°C, add 2.2g of 1,4-butanediol (BDO), react for a certain period of time, stop when the -NCO group content reaches the set value, the set value of this embodiment is 7.71% (the mass fraction...

Embodiment 2

[0045] Embodiment 2, the preparation of internal crosslinking castor oil-based aqueous polyurethane emulsion

[0046] Add 12g of polycarbonate diol (PCDL-2000) and 12g of castor oil (CO) into the reaction reactor (wherein, the mass ratio of PCDL-2000 and CO is 1:1), and vacuum remove at 120°C Water for 1.5 hours, when the temperature of the system drops to 70°C, add 17.7g of isophorone diisocyanate (IPDI) and 0.016g of phosphoric acid, the R value is 1.2, and react at 85°C for 2h under the protection of dry nitrogen. Properly lower the temperature of the system (eg, to 75°C), add 2.4g of dimethylolpropionic acid (DMPA) and 0.012g of dibutyltin dilaurate (DBTDL), and continue to react at a constant temperature of 80°C for about 1.5h.

[0047] Heat up to 85°C, add 1.9g of 1,4-butanediol (BDO) and 0.24g of trishydroxymethylaminomethane (THAM) (accounting for 0.5% of the total prepolymer mass), react for a certain period of time, add 4.0g of butane Ketone (MEK) adjusts the viscos...

Embodiment 3

[0050] Embodiment 3, the preparation of internal crosslinking castor oil-based aqueous polyurethane emulsion

[0051] Add 12g of polycarbonate diol (PCDL-2000) and 12g of castor oil (CO) into the reaction reactor (wherein, the mass ratio of PCDL-2000 and CO is 1:1), and vacuum remove at 120°C Water for 1.5 hours, when the temperature of the system drops to 70°C, add 17.7g of isophorone diisocyanate (IPDI) and 0.0192g of phosphoric acid, the R value is 1.2, and react at 80°C for 2h under the protection of dry nitrogen. Properly lower the temperature of the system (eg, to 75°C), add 2.4g of dimethylolpropionic acid (DMPA) and 0.0144g of dibutyltin dilaurate (DBTDL), and continue to react at a constant temperature of 80°C for about 1.5h.

[0052] Raise the temperature to 85°C, add 1.7g of 1,4-butanediol (BDO) and 0.36g of trishydroxymethylaminomethane (THAM) (accounting for 0.75% of the total prepolymer mass), react for a certain period of time, and add 3.5g of butyl Ketone (MEK...

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Abstract

The invention relates to inner crosslinking type caster oil-based waterborne polyurethane emulsion and a preparation method thereof. The preparation method of the inner crosslinking type caster oil-based waterborne polyurethane emulsion is characterized by comprising the following steps of (1) adding polymer polyol, castor oil, diisocyanate, a catalyst and a small molecule chain extender into a reactor for reaction, so as to obtain caster oil-based waterborne polyurethane low polymers; (2) adding a hydrophilic chain extender and a polyfunctional-group crosslinking agent into the caster oil-based waterborne polyurethane low polymers, then, performing reaction; adding butanone to regulate the viscosity to be 16.5mPa*S, so as to obtain inner crosslinking type caster oil-based waterborne polyurethane; (3) adding a neutralizer into the inner crosslinking type caster oil-based waterborne polyurethane; after reaction, adding deionized water; performing high-speed shearing emulsification, thus obtaining the inner crosslinking type caster oil-based waterborne polyurethane emulsion after butanone is steamed out. The method has the advantages that the technical process is simple; the crosslinking efficiency is greatly improved; the mechanical property of the product is good.

Description

technical field [0001] The invention relates to an internal crosslinking type castor oil-based aqueous polyurethane emulsion and a preparation method thereof, belonging to the field of fine polymer materials and preparation thereof. Background technique [0002] Water-based polyurethane (WPU) is a kind of polymer synthetic material. Its coating film has excellent properties such as high / low temperature resistance, abrasion resistance, corrosion resistance and flexibility. It is mainly used in textiles, leather processing, coatings, etc. , wood processing, building materials, papermaking and adhesives and other industries, which use water as the dispersion medium, has the advantages of non-toxic, environmental protection and non-combustible. [0003] Affected by its own structure and dispersion medium, waterborne polyurethane has poor surface spreading during film formation, long drying time, poor film formation and substrate compounding, low mechanical properties, low hardne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/48C08G18/44C08G18/75C08G18/32C08G18/36C08G18/34C08J3/03C09D175/06C09D175/08C09J175/06C09J175/08
CPCC08G18/12C08G18/348C08G18/36C08G18/44C08G18/4825C08G18/4854C08G18/664C08G18/6655C08G18/6659C08G18/6662C08G18/6674C08G18/6692C08G18/6696C08G18/755C08J3/03C08J2375/06C08J2375/08C09D175/06C09D175/08C09J175/06C09J175/08C08G18/3206
Inventor 易英张延飞周宏伟蒋文远王丽王洲洲徐云超
Owner WUHAN UNIV OF TECH
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