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MDI-TMP (diphenyl-methane-diisocyanate-trimethylolpropane) type polyurethane prepolymer with high end-capping rate

A polyurethane prepolymer, end-capping rate technology, applied in the field of chemistry, can solve problems such as low end-capping rate, and achieve the effects of reducing damage, improving end-capping rate, and reducing content

Inactive Publication Date: 2013-01-09
SUZHOU XIELU NETWORK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the end-blocking rate of general polyurethane end-blocking agents is low, only about 20%.

Method used

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  • MDI-TMP (diphenyl-methane-diisocyanate-trimethylolpropane) type polyurethane prepolymer with high end-capping rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 15 parts of ethyl acetate to a reaction kettle filled with nitrogen, then add 30 parts of MDI, raise the temperature to 50°C, stir at the same time until it is completely dissolved, add 15 parts of TMP, and raise the temperature to 70°C, the reaction 4 hours, then add 30 parts of sodium bisulfite, 10 parts of sodium sulfite, and react for 2 hours; finally add a small amount of phosphoric acid to adjust the pH to 4.5.

[0015] After testing, the technical indicators of the obtained MDI-TMP bridging agent are as follows: the appearance is a water-white transparent liquid at room temperature, the solid content is 56%, the viscosity is 1304mPa. s, the -NCO content is 11.0~11.5%, free TDI monomer The content is less than 0.05%; the end-capping rate of the polyurethane product is greater than 90% as determined by iodine molecular titration.

Embodiment 2~3

[0017] The preparation process steps of Examples 2-3 are the same as those of Examples, except that the ratio of MDI to TMP added, end-capping agent, pH regulator and reaction parameters are different. Table 1 is the ratio of MDI and TMP added in Examples 2 to 3, end-capping agent, pH regulator and reaction parameters.

[0018]

[0019] Embodiment 2 and 3, what adopt all is sodium sulfite, and the capping rate of tested polyurethane product is also greater than 90%.

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Abstract

The invention discloses an MDI-TMP (diphenyl-methane-diisocyanate-trimethylolpropane) type polyurethane prepolymer with high end-capping rate, which is prepared by a method comprising the following steps: a) adding an organic solvent and MDI into a reaction kettle filled with nitrogen or carbon dioxide, heating, stirring and dissolving; b) adding TMP into solution obtained in the step a), and performing heating reaction for 1-4 hours to get a pre-polymerization product; and c) performing end-capping reaction: adding an end-capping agent and an accelerating agent in the pre-polymerization product obtained in the step b), reacting for 1-2 hours, and finally regulating the pH value to 5-7 for preparation. By adopting the low-toxicity MDI, the content of free TDI (toluene diisocyanate) is greatly reduced, and the harm to the health of a human body is further reduced; and the end-capping rate of a polyurethane product is simultaneously greatly improved.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to a water-soluble polyurethane prepolymer. Background technique [0002] Polyurethane has a wide range of uses, especially in the fields of synthetic fibers and textile finishing agents, because of its good mechanical properties, toughness, wear resistance, plumpness, and brightness, and can be cured at low temperature. Water-soluble polyurethane uses water as the medium, which is safe and non-flammable. It retains the excellent performance of traditional solvent-based polyurethane, and at the same time can give fabrics excellent softness, fullness, washability, wear resistance, good resilience, and smoothness. However, the traditional water-soluble polyurethane is synthesized by TDI (toluene diisocyanate) and TMP (trimethylolpropane), but TDI is very harmful to the human body. The free TDI content of the TDI-TMP bridging agent produced in China Mostly in 2~5%, and the isocyanate group in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/80C08G18/76C08G18/32C08G18/10
Inventor 钱华张宁荣
Owner SUZHOU XIELU NETWORK TECH
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