Water-soluble alcohol-soluble polyurethane and preparation method thereof

An alcohol-soluble, polyurethane technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as inconvenient use, and achieve the effect of maintaining initial viscosity, fast curing, and convenient changes

Inactive Publication Date: 2008-07-30
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a water-soluble alcohol-soluble polyurethane and its preparation method, to overcome the inconvenient defects of the existing alcohol-soluble polyurethane because it cannot be dissolved in water, and to achieve high initial viscosity, fast curing and stable it is good

Method used

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  • Water-soluble alcohol-soluble polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] in N 2 Under the protection of 110°C vacuum dehydration for 2h, 34.5g of polyoxypropylene diol (N-210), 30g of isophorone isocyanate (IPDI) and 2.5g of epoxy resin E-51 were weighed and placed in a 250ml three-necked flask In the middle, react at 85°C for 2 hours, then add 3.4g of dimethylolpropionic acid (DMPA) and 15ml of acetone, react at 70°C for 1 hour, finally add 8.34g of diethylene glycol (DEG), dilaurate dilaurate Two drops of butyltin (T-12), one drop of stannous octoate (T-9), react at 60°C for 4 hours, cool down to 45°C and discharge, which is the prepolymer; pour the prepolymer into the emulsification tank , at a rotating speed of 2500r / min, after neutralizing to pH 8 with 3.7ml of triethylamine, add 79.0g of ethanol and emulsify to obtain a white emulsion with a solid content of 50%. The obtained emulsion was distilled off under reduced pressure at 25°C and -0.08Mpa to remove the solvent acetone, and a white emulsion was prepared.

[0039] The test metho...

Embodiment 2

[0049] Under the protection of N2, weigh 34.5g of polybutylene adipate (PBA) after vacuum dehydration at 110°C for 2 hours, 30g of IPDI and 12.7g of epoxy resin E-5, put them in a 250ml three-necked flask, and react at 85°C After 2 hours, add 2.72g of DMPA, react at 70°C for 1 hour, finally add 8.88g of DEG, two drops of catalyst T-12 and one drop of T-9, 30ml of acetone, react at 60°C for 4.5 hours, cool down to 35°C and discharge , to obtain a prepolymer; pour the prepolymer into an emulsification tank, and at a speed of 2500r / min, use 3.0ml of triethylamine to neutralize to a pH of 7, add 77.5g of ethanol, and emulsify to obtain a solid Measure 50% white alcohol-soluble polyurethane emulsion. The obtained alcohol-soluble polyurethane emulsion was distilled off under reduced pressure at 25°C and -0.08Mpa to remove the solvent acetone, and the product was obtained.

[0050] From the comparative analysis of Examples 1 and 2, it can be seen that N-210 and PBA can be replaced b...

Embodiment 3

[0052] Under the protection of N2, weigh 34.5g of N-210, 30g of IPDI and 1.5g of E-51 resin after vacuum dehydration at 110°C for 2h, put them in a 250ml three-neck flask, react at 90°C for 1.5 hours, then add N-methyl Diethanolamine 3.3g, acetone 30ml, react at 65°C for 1 hour, finally add DEG 7.81g, TMP 0.7g, one drop of catalyst T-12, one drop of T-9, react at 60°C for 4.5 hours, cool down to 25°C and discharge , to obtain the prepolymer; pour the prepolymer into an emulsification tank, and at a speed of 2000r / min, neutralize it with 2.2g of glacial acetic acid to pH 6, add 40g of ethanol, emulsify, and obtain a solid content of 33 % white emulsion. Distill the resulting alcohol-soluble polyurethane emulsion at 25°C and -0.08Mpa under reduced pressure to remove the solvent acetone to obtain the product.

[0053] Since the TMP in this embodiment has 3 hydroxyl groups, it plays the role of crosslinking in this embodiment, so it can be replaced by a chain extender with a func...

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Abstract

The invention relates to water soluble alcohol-soluble polyurethane and a preparation method thereof. The method is characterized in that 5 to 35 percent of oligomer polyhydric alcohol reacts with 5 to 30 percent of polyisocyanate for 2 to 2.5h at 70 to 90 DEG C, 1 to 20 percent of hydrophilic chain-extending agent and 1 to 2 percent of acetone are added, the temperature is maintained at 60 to 70 DEG C for 1 to 1.2h, then 2 to 15 percent of chain-extending agent and 0.3 to 0.5 percent of catalyst are added, after reaction is performed at 60 to 70 DEG C for 3 to 4h, the temperature is reduced to 30 to 50 DEG C for discharging, and then a pre-polymer is obtained; after being neutralized with 2 to 5 percent of trihexylamine, the pre-polymer is added into 10 to 70 percent of ethyl alcohol, and an emulsion product can be obtained after emulsification. In the invention, not only superior properties such as high initial viscosity, quick solidification, good stability, etc. of solvent-type polyurethane can be guaranteed, but also the solid content of polyurethane can be adjusted to the actually required value through water, the default of the prior alcohol-soluble polyurethane that the operation is inconvenient because of water insolubility is overcome, thereby the invention can be used in industries such as lumber, flexible package, compound lamination, etc.

Description

Technical field: [0001] The invention belongs to the technical field of polyurethane adhesives, and in particular relates to alcohol-soluble polyurethane and a preparation method thereof. Background technique [0002] Chinese patent CN02130103.4 discloses a polyurethane resin aqueous dispersion and a water-soluble polyurethane adhesive, which utilizes the higher bonding strength and good heat and water resistance of polycaprolactone to improve the storage stability and The initial adhesive force, but due to the slow volatilization of water, the water-soluble polyurethane adhesive cannot reach the performance of solvent-based polyurethane, and cannot replace the application of solvent-based polyurethane adhesive in some specific occasions. [0003] Chinese patent application 200610022515.7 has introduced a kind of alcohol-soluble polyurethane two-component adhesive and its preparation process, and its main agent and curing agent all use ethanol as diluent, the alcohol-soluble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/65C08G18/10C09J175/04
Inventor 许戈文谢伟纪学顺张文荣熊潜生
Owner ANHUI UNIVERSITY
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