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Environment-friendly polyurethane prepolymer and synthetic method thereof

A polyurethane prepolymer and synthetic method technology, applied in the polymer field, can solve the problems of unstable prepolymer viscosity, shortened prepolymer storage period, and limited application, and achieve stable storage, stable viscosity, and aging resistance Excellent effect

Active Publication Date: 2014-02-05
GUANGZHOU JRACE ATHLETIC FACILITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even a small amount of residual isocyanate in the prepolymer can make the viscosity of the prepolymer unstable, and the viscosity of each batch of prepolymer produced is not the same, and due to the slow reaction of residual isocyanate, prepolymerization during storage after preparation The viscosity of the polymer will also gradually increase, resulting in a shortened shelf life of the prepared prepolymer and limited application

Method used

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  • Environment-friendly polyurethane prepolymer and synthetic method thereof
  • Environment-friendly polyurethane prepolymer and synthetic method thereof
  • Environment-friendly polyurethane prepolymer and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The proportions of the materials used in this example are as follows:

[0034] The molar ratio of [NCO] / [OH] is 1.5

[0035] Polyether glycol (M W =2000): polyether triol (M W =1000)=3:1 (molar ratio, M W is molecular weight)

[0036] Polyisocyanate: Liquefied MDI (carbodiimide-modified MDI)

[0037] Small molecules (di-n-butylamine): 0.2%

[0038] Wherein, the amount of the small molecular substance is the mass percentage content relative to the total mass of all substances in this embodiment.

[0039] The concrete process that the present embodiment prepares the environment-friendly modified polyurethane prepolymer is as follows:

[0040] a) put polyether glycol (M) in the reactor W = 2000) and polyether triol (M W =1000) mixture, dehydrated and dried in vacuum at 95°C for 1.5h, dried to a moisture content of less than 200ppm, cooled to 80°C, slowly added liquefied MDI to the reaction kettle, reacted at 80°C for 4h after feeding, and titrated method to determ...

Embodiment 2

[0044] The proportioning of material used in this embodiment is as follows:

[0045] [NCO] / [OH] molar ratio is 1.5

[0046] Polyether diol (M W =4000): polyether trihydric alcohol (M W =500)=3:1 (molar ratio, M W is the molecular weight)

[0047] Polyisocyanate: liquefied MDI (carbodiimide modified MDI)

[0048] Small molecular substances (diethanolamine): 0.2%

[0049] Wherein, the amount of the small molecular substance is the mass percentage relative to the total mass of all substances in this embodiment.

[0050] The specific process of the preparation of environment-friendly modified polyurethane prepolymer in this embodiment is as follows:

[0051] a) drop into polyether diol (M W =4000) and polyether triols (M W =500) mixture, dehydration and drying under vacuum at 95°C for 1.5h, until the moisture content was lower than 200ppm, then cooling down to 80°C, slowly adding liquefied MDI to the reaction kettle, and reacting the two at 80°C for 4h after feeding, and t...

Embodiment 3

[0054] The proportioning of the material used of the present embodiment is as follows:

[0055] [NCO] / [OH] molar ratio is 1.7

[0056] Polyether diol (M W =1000): polyether trihydric alcohol (M W =2000)=2:1 (molar ratio, M W is the molecular weight)

[0057] Polyisocyanate: Isophorone Diisocyanate (IPDI)

[0058] Small molecular substances (N-methylhydroxylamine): 0.2%

[0059] Wherein, the amount of the small molecular substance is the mass percentage relative to the total mass of all substances in this embodiment.

[0060] The specific process of the preparation of environment-friendly modified polyurethane prepolymer in this embodiment is as follows:

[0061] a) drop into polyether diol (M W =1000) and polyether triols (M W = 2000) mixture, dehydrated and dried under vacuum at 95°C for 1.5h, dried until the moisture content was lower than 200ppm, cooled to 80°C, slowly added isophorone diisocyanate (IPDI) into the reaction kettle, and made the two React at 80°C for...

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Abstract

The invention discloses environment-friendly modified polyurethane prepolymer and a synthetic method thereof. The synthetic method comprises the following steps of: firstly, reacting polyether polyol with poly-isocyanate to obtain conventional terminal poly-isocyanate based polyurethane prepolymer; secondly, modifying the terminal poly-isocyanate based polyurethane prepolymer by using organo-siloxane to synthesize terminal silicone based polyurethane prepolymer; and finally, adding micromolecular substances into a reaction system to eliminate the residual isocyanate in the system so as to finally prepare the environment-friendly modified polyurethane prepolymer. The organo-siloxane modified polyurethane prepolymer prepared by using the method disclosed by the invention is not harmful to environment and production and health of a user, is an environment-friendly product, can be widely applied in multiple fields such as production of conventional adhesives, sealants, coatings, elastic bodies and the like, and has the advantages of being more environment-friendly, stored more stably and the like.

Description

technical field [0001] The invention relates to the field of polymers, in particular to an environment-friendly polyurethane prepolymer and a synthesis method thereof. Background technique [0002] Since the appearance of polyurethane in the 1940s, its prepolymers have been widely used in coatings, adhesives, sealants, elastomers, etc. It is a multifunctional polymer material and the fastest growing polymer. one of the materials. Polyurethane contains a characteristic unit structure urethane (-NH-CO-), and the chain contains alternating soft segments and hard segments, making its aggregated structure a multiphase structure, which determines the excellent wear resistance of polyurethane materials. , flexibility and other properties. [0003] However, the large-scale use of polyurethane has caused more and more attention to the environmental pollution and harm to human health. Coatings, adhesives, sealants, and elastomers prepared from isocyanate-terminated polyurethane pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/38C08G18/12C08G18/48C08G18/77C09D175/08C09J175/08
Inventor 詹金城
Owner GUANGZHOU JRACE ATHLETIC FACILITIES