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High-compatibility organic silicon modified epoxy resin polyol aqueous dispersion and preparation method thereof

A technology of epoxy resin and organosilicon, which is applied in the field of organosilicon modified polyol water dispersion and its preparation, can solve the problems such as the opacity of polyurethane paint film, and achieve the effect of improving water resistance

Active Publication Date: 2020-03-17
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyurethane paint film prepared by this method is opaque, because long-chain polysiloxane is easy to separate from epoxy resin and polyurethane microphase.

Method used

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  • High-compatibility organic silicon modified epoxy resin polyol aqueous dispersion and preparation method thereof
  • High-compatibility organic silicon modified epoxy resin polyol aqueous dispersion and preparation method thereof
  • High-compatibility organic silicon modified epoxy resin polyol aqueous dispersion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 100g of terpene-based epoxy resin (epoxy value 0.36mol / 100g, the preparation method refers to Wu Guomin, Kong Zhenwu, etc. *, Chu Fuxiang. Hydrogenated terpene maleic anhydride to synthesize epoxy resin. Forestry Chemistry and Industry, 2007: 27(3), 57-62), 10g epoxy-terminated silicone resin (epoxy value 0.14mol / 100g, The preparation method refers to Guifeng Liu, Guomin Wu, Shuping Huo, Can Jin, ZhenwuKong. Synthesis and properties of non-isocyanate polyurethane coatings derived from cyclic carbonate-functionalized polysiloxanes. Progress in Organic Coatings, 2017, 112: 169.15gN), 5 Base ethanolamine, 66.6g ethanol, heating and stirring, reflux reaction for 2 hours, distilling off ethanol to obtain a yellow transparent silicone-modified epoxy resin-based polyol.

[0039] Add 3.0g DMPA, 7.8g toluene diisocyanate, and 20.0g acetone to a four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a condenser, heat and stir, and reflux for 3 hours to o...

Embodiment 2

[0042] In a four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a condenser, add 100g of terpene-based epoxy resin (epoxy value 0.36mol / 100g), 10g of side chain epoxy-based silicone resin (epoxy value 0.312mol / 100g, the preparation method refers to Guifeng Liu, Guomin Wu, Shuping Huo, Can Jin, Zhenwu Kong. Synthesis and properties of non-isocyanate polyurethane coatings derived from cycliccarbonate-functionalized polysiloxanes. Progress in Organic Coatings, 2017, 112: 175), 29.4g of N-methylethanolamine, 59.7g of acetone, heating and stirring, reflux for 3 hours, distilling off the acetone to obtain a yellow transparent silicone-modified epoxy resin-based polyol.

[0043] Add 3.0g DMPA, 7.8g toluene diisocyanate, and 20.0g acetone to a four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a condenser, heat and stir, and reflux for 3 hours to obtain a hydrophilic prepolymer.

[0044] Add 25.6g of silicone-modified epoxy resin-base...

Embodiment 3

[0046] In a four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a condenser, add 100g of bisphenol A epoxy resin (epoxy value 0.44mol / 100g), 15g of terminal epoxy-based silicone resin (epoxy value 0.14 mol / 100g), 48.4g diethanolamine, 70.0g ethanol, heated and stirred, refluxed for 2h, and evaporated to remove ethanol to obtain a yellow transparent silicone-modified epoxy resin-based polyol.

[0047] Add 3.0g DMPA, 7.6g 1,6-hexamethylene diisocyanate and 20.0g acetone to a four-necked round-bottomed flask equipped with a thermometer, a stirrer, and a condenser, heat and stir, and reflux for 3 hours to obtain a hydrophilic prepolymer body.

[0048] Add 27.5g of silicone-modified epoxy resin-based polyol to the above-mentioned hydrophilic prepolymer, react at 65°C for 4h, and neutralize the product with 2.0g of N,N-dimethylethanolamine (diluted in 2.0g of water) , then stirred and dispersed with deionized water, evaporated acetone to obtain a milky whit...

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Abstract

The invention discloses a high-compatibility organic silicon modified epoxy resin polyol aqueous dispersion and a preparation method thereof. The method comprises the following steps of: uniformly mixing organic silicon resin with an epoxy group with general epoxy resin by utilizing a similar compatibility principle, and then performing reaction with an amino compound to synthesize epoxy resin-based polyol; performing chain extension by using diisocyanate and 2,2-bis(hydroxymethyl)propionic acid or 2, 2-bis(hydroxymethyl)butyric acid, then performing neutralization with alkali, and directly performing water dispersion to obtain a self-emulsifying organic silicon modified epoxy resin polyol aqueous dispersion. The hydroxyl value of the organic silicon modified epoxy resin polyol is 50-200 mg / g, the Z-average particle size of the aqueous dispersion is 30-500 nm, and the solid content is greater than or equal to 35%. The organic silicon modified epoxy resin polyol prepared by the method is transparent resin and has good compatibility.

Description

technical field [0001] The invention relates to a silicone-modified polyol water dispersion and a preparation method thereof, in particular to a silicone-modified epoxy resin polyol water dispersion and a preparation method thereof. Background technique [0002] With the advancement of my country's ecological civilization construction, the emission of volatile organic compounds (VOC) in traditional solvent-based coatings and adhesives is subject to increasingly strict restrictions. Water-based polymer resin has become the development trend of coatings and adhesives industry. Two-component water-based polyurethane combines the high performance of solvent-based polyurethane and the low VOC content of water-based resins. It has become a research hotspot for resins for high-performance coatings and adhesives, and has been widely used in the fields of automobiles, wood, and industrial maintenance. The two-component waterborne polyurethane is composed of a waterborne polyol compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/65C08G18/34C08G18/58C08G18/61
CPCC08G18/348C08G18/58C08G18/61C08G18/6541
Inventor 吴国民孔振武陈健刘贵锋
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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