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Preparation method for polysiloxane emulsion modified waterborne polyurethane emulsion

A technology of polysiloxane emulsion and water-based polyurethane, which is applied in the field of preparation of water-based polyurethane hybrid emulsion, can solve the problem that the emulsion colloidal stability and the microstructure of the film are not easy to control, and the improvement of water resistance and surface hydrophobicity is not obvious or even decline, the mechanical properties of the system do not improve significantly or even decline, etc.

Active Publication Date: 2016-06-01
RUNTAI CHEM TAIXING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties (strength, modulus), adhesion, and water resistance of water-based polyurethane latex films are not comparable to those of traditional solvent-based polyurethanes, which limits the further wide application of the coating film.
Introducing inorganic nanomaterials such as silica, clay, and carbon nanotubes into the WPU system can effectively improve the mechanical properties of the system, but the water resistance and surface hydrophobic properties of the system do not improve significantly or even decline.
Polydimethylsiloxane (PDMS) has the advantages of low surface free energy, strong hydrophobicity, and good flexibility. PDMS modified WPU can effectively improve the water resistance and surface hydrophobicity of the system, but the mechanical properties of the system are not significantly improved or even decreased.
The self-crosslinking WPU emulsion is obtained by introducing aminosiloxane into the WPU system, and the mechanical properties and water resistance of the polyurethane film are improved, but the colloidal stability of the emulsion and the microstructure of the film are not easy to control

Method used

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  • Preparation method for polysiloxane emulsion modified waterborne polyurethane emulsion
  • Preparation method for polysiloxane emulsion modified waterborne polyurethane emulsion
  • Preparation method for polysiloxane emulsion modified waterborne polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Polysiloxane microsphere emulsion: Weigh 0.2g sodium dodecylsulfonate, 0.1g sodium bicarbonate and 0.1g sodium dihydrogen phosphate in 40.0g deionized water and mix uniformly to form a water phase, and add into a 250mL four-neck flask. In addition, weigh 9.0g vinyltrimethoxysilane monomer, 0.5g hexadecane and 0.2g azobisisobutyronitrile according to the proportion, mix and disperse evenly to form an oil phase, and add the oil phase components dropwise to the water phase group Stir and emulsify while adding dropwise, stir for 0.5h for coarse emulsification, then finely emulsify for 10min, after fine emulsification, polymerize at 70°C for 5h to obtain a polyorganosiloxane emulsion

Embodiment 2

[0022] Preparation of water-based polyurethane film: Add 17.4g of isophorone diisocyanate (IPDI) into a 250mL four-necked flask equipped with a stirrer, thermometer and reflux condenser, and add 57.1g of polycarbonate dropwise with a dropping funnel while stirring at room temperature Ester polyol (PCD2000) and 0.05g catalyst dibutyltin dilaurate (DBTDL), the dropping rate is controlled within 1.5h, after the addition is completed, react at 45±5°C for 1-2h; then raise the temperature to 60°C, add 3.75g Dimethylolpropionic acid (DMPA), reacted for 3-4h, measured the degree of reaction by the toluene-di-n-butylamine back titration method until the NCO group content reached the theoretical value; then added 2.83g of triethylamine to the resin , react for 0.5-1h; add 198.3g of deionized water dropwise to the system for emulsification; and finally prepare a water-based polyurethane film.

Embodiment 3

[0024] Preparation of silicone-modified water-based polyurethane film: Add 17.4g of isophorone diisocyanate (IPDI) to a 250mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add it dropwise with a dropping funnel while stirring at room temperature 51.3g of polycarbonate polyol (PCD2000) and 0.05g of catalyst dibutyltin dilaurate (DBTDL), the dropping speed is controlled within 1.5h, and after the dropping is completed, react at 45±5°C for 1-2h; add 6.85g Organosilicon compound (PDMS), react for 0.5-1h; then heat up to 60°C, add 3.75g dimethylolpropionic acid (DMPA), react for 3-4h, measure the reaction degree by toluene-di-n-butylamine back titration method, Until the determined NCO group content reaches the theoretical value; then add 2.83g of triethylamine to the resin and react for 0.5-1h; add 198.3g of deionized water dropwise to the system for emulsification; finally prepare a waterborne polyurethane film.

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Abstract

The invention particularly relates to a preparation method for polysiloxane emulsion modified waterborne polyurethane emulsion. The preparation method comprises the steps of taking oligomer dihydric alcohol as a soft section and an isocyanate compound as a hard section, and introducing polysiloxane emulsion in an emulsifying process to prepare the polysiloxane emulsion modified waterborne polyurethane emulsion. The introduction of polysiloxane effectively improves the tensile strength and modulus of a waterborne polyurethane emulsion film; the surface hydrophobicity of the film is enhanced; the water absorption rate is reduced; and the film has relatively high transparency. The waterborne polyurethane hybrid emulsion prepared with the method can be widely applied to the fields of high-performance coating materials, printing ink, adhesives, sealing materials and the like.

Description

technical field [0001] The invention relates to a preparation method of an aqueous polyurethane hybrid emulsion, in particular to a preparation method of an organosiloxane emulsion and an aqueous polyurethane emulsion. Background technique [0002] Water-based polyurethane (WPU) uses water as the dispersion medium, has the advantages of high molecular weight, low viscosity, easy construction, environmental protection, safety, hygiene, etc., and has been well applied in the fields of coatings, adhesives, inks, and sealants. However, the mechanical properties (strength, modulus), adhesion, and water resistance of waterborne polyurethane latex films are not comparable to those of traditional solvent-based polyurethanes, which limits the further extensive application of the coating film. Introducing inorganic nanomaterials such as silica, clay, and carbon nanotubes into the WPU system can effectively improve the mechanical properties of the system, but the water resistance and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/44C08G18/34C08G18/12C08G18/62C08F130/08C08F2/26C08J5/18C08L75/06
CPCC08F2/26C08F130/08C08G18/12C08G18/348C08G18/4063C08G18/44C08G18/6295C08G18/6541C08G18/6659C08G18/755C08J5/18C08J2375/06
Inventor 张胜文王亚东赵杰徐子墨白绘宇刘晓亚
Owner RUNTAI CHEM TAIXING CO LTD
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