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Method for preparing organosilicon modified waterborne polyurethane

A water-based polyurethane and silicone technology, applied in the field of polymer materials, can solve the problems of environmental pollution, volatile, strong odor, etc., and achieve the effects of excellent comprehensive mechanical properties, excellent hydrolysis resistance, and high solid content

Inactive Publication Date: 2018-09-25
华东理工常熟研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former siloxane segment is embedded in the main chain of polyurethane, and its ability to migrate to the surface is restrained by the main chain. Therefore, in order to obtain a better surface modification effect, it is often necessary to add a large amount of amino silicone oil, but this will also lead to a significant decrease in the mechanical strength of polyurethane
The latter siloxane chain is suspended on the main chain of polyurethane, which is conducive to the migration of silicon atoms to the surface. Only a small amount of amino silicone oil can be added to improve the surface properties of polyurethane, but due to the solubility of the two types of polymers, silicone and polyurethane The parameters vary greatly, and the reaction between amino silicone oil and diisocyanate is rapid, so the polymerization reaction needs to be carried out in a special solvent. Although this can improve the performance of polyurethane, the organic solvent is flammable, explosive, volatile, smelly, and toxic. Production and use will cause environmental pollution, which is not conducive to environmental protection
[0005] When preparing waterborne polyurethane (WPU), due to the introduction of hydrophilic groups, the water resistance of the waterborne polyurethane (WPU) film is poor. In practical applications, this shortcoming greatly hinders the popularization and application of WPU; in previous studies In the work, there are many reports in the literature that introduce cyanoethyl and chloropropyl groups into the organic silicon oligomer chain segment. Due to the consideration that this method requires a large amount of organic solvents, it does not meet environmental protection requirements.

Method used

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  • Method for preparing organosilicon modified waterborne polyurethane
  • Method for preparing organosilicon modified waterborne polyurethane
  • Method for preparing organosilicon modified waterborne polyurethane

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Add 25.6 grams of PBA-1000 and 25.6 grams of PTMG-1000 into a four-necked flask equipped with a stirrer, reflux condenser, thermocouple, etc., raise the temperature to 105°C, dehydrate in vacuum for 2 hours, cool down to 60°C, and add IPDI 5.69 gram, add an appropriate amount of DBTDL 0.04 grams, blow nitrogen, react for 1 hour, cool down to 75°C, add the remaining 21.38 grams of IPDI, add 2.739 grams of DMPA, continue to heat up to 80°C and keep warm until --NCO reaches the theoretical value. After cooling down to 50°C, 11.99 grams of acetone and 1.62 grams of KH-550 were added, and the temperature was raised to reflux temperature for 1 hour of reaction. Cool down to 40°C, add 1.86 g of triethylamine to neutralize and react for 20 minutes, then add 78.33 g of deionized water for high-speed shear emulsification for 10 minutes, add the aqueous solution obtained by dissolving 2.51 g of EDA in 8.54 g of water, and continue stirring for 30 minutes . Finally, the acetone is...

Embodiment 2

[0039] Add 38.4 grams of PBA-1000 and 12.8 grams of PTMG-1000 to a four-neck flask equipped with a stirrer, reflux condenser, thermocouple, etc., heat up to 105°C, dehydrate in vacuum for 2 hours, cool down to 60°C, and add IPDI 5.69 gram, add an appropriate amount of DBTDL 0.04 grams, blow nitrogen, react for 1 hour, cool down to 75°C, add the remaining 21.38 grams of IPDI, add 2.739 grams of DMPA, continue to heat up to 80°C and keep warm until --NCO reaches the theoretical value. After cooling down to 50°C, 11.99 grams of acetone and 1.62 grams of KH-550 were added, and the temperature was raised to reflux temperature for 1 hour of reaction. Cool down to 40°C, add 1.86 g of triethylamine to neutralize and react for 20 minutes, then add 78.33 g of deionized water for high-speed shear emulsification for 10 minutes, add the aqueous solution obtained by dissolving 2.51 g of EDA in 8.54 g of water, and continue stirring for 30 minutes . Finally, the acetone is removed in vacuum...

Embodiment 3

[0041] Add 25.6 grams of PBA-1000 and 25.6 grams of PTMG-1000 into a four-necked flask equipped with a stirrer, reflux condenser, thermocouple, etc., raise the temperature to 105°C, dehydrate in vacuum for 2 hours, cool down to 60°C, and add IPDI 5.69 gram, add an appropriate amount of DBTDL 0.04 grams, blow nitrogen, react for 1 hour, cool down to 75°C, add the remaining 21.38 grams of IPDI, add 2.739 grams of DMPA, continue to heat up to 80°C and keep warm until --NCO reaches the theoretical value. After cooling down to 50°C, 11.99 grams of acetone and 0.81 grams of KH-550 were added, and the temperature was raised to reflux temperature for 1 hour of reaction. Cool down to 40°C, add 1.86 grams of triethylamine to neutralize and react for 20 minutes, then add 77.69 grams of deionized water for high-speed shear emulsification for 10 minutes, add the aqueous solution obtained by dissolving 2.61 grams of EDA in 8.55 grams of water, and continue stirring for 30 minutes . Finally...

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Abstract

The invention belongs to the technical field of polymer materials, and particularly relates to a method for preparing organosilicon modified waterborne polyurethane. PBA-1000, PTMG-1000, IPDI, DMPA and KH-550 are adopted as main raw materials, and through changing the dosage of the KH-550, a series of waterborne polyurethane emulsions are prepared. The prepared waterborne polyurethane has a high solid content and high stability, and the solid content can be 50%. Through introduction of the organosilicon KH-550, the KH-550 successfully enters a polyurethane chain segment so that the prepared waterborne polyurethane has excellent hydrolysis resistance, and the 24-h water absorption rate is less than 5%.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for preparing organic silicon-modified waterborne polyurethane. Background technique [0002] Polyurethane (polyurethane), referred to as polyurethane (PU), is a general term for polymer materials containing carbamate group (-NHCOO-) repeating structural units in the main chain molecule. Polyurethane has been developed since the 1930s and has a history of more than 60 years. Due to its unique processing properties, it has developed rapidly and is widely used in industry and daily life. It has become the fourth largest after wood, cement and metal materials. Materials, it can be made into polyurethane foam, coatings, rubber, adhesives, synthetic leather, synthetic fibers, waterproof grouting materials, paving materials and other products, widely used in transportation, electronic equipment, food processing, synthetic leather , construction, machiner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/38C08G18/12C08G18/32C08G18/34C08G18/42C08G18/48C08G18/75C08G18/66
CPCC08G18/4238C08G18/0823C08G18/12C08G18/348C08G18/4018C08G18/4854C08G18/6625C08G18/755C08G18/3893C08G18/3228
Inventor 董擎之张翔陈立
Owner 华东理工常熟研究院有限公司