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Preparation method of novel polyurethane chain extender

A polyurethane and chain extender technology, which is applied in the preparation of organic compounds, the preparation of carboxylic acid amides, chemical instruments and methods, etc., can solve the problem of carcinogenic reaction speed, poor temperature resistance and tear resistance of polyurethane elastomers, and inability to use MDI-based Prepolymers, etc.

Inactive Publication Date: 2012-10-03
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the risk of carcinogenesis caused by the existing MOCA as a chain extender and the problem that it cannot be applied to MDI-based prepolymers due to too fast reaction speed, and it can also overcome the problems caused by the use of alcohol prepolymers. The problem of poor temperature resistance and tear resistance of polyurethane elastomers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1 Weigh 100g of MDA, after purification, filtration, recrystallization and drying process, 93.7g of purified and dried MDA can be obtained, put it into a 500ml flat-bottomed flask, add 3g of NaCl, and then add 190g of DOA. The new low-viscosity liquid chain extender PUCURE was obtained by stirring with vinyl fluoride stirring blade at 50 r / min for 30 minutes.

[0011] Using the obtained crosslinking agent PUCURE to extend the chain of Adiprene, and comparing it with MOCA, the mechanical data of the obtained polyurethane elastomers are as follows:

[0012] Tensile Strength Elongation Hardness (Shore A) PUCURE 43 590 93 MOCA 49 420 72

Embodiment 2

[0013] Example 2 Weigh 100g of MDA, after purification, filtration, recrystallization, and drying processes, 93.7g of purified and dried MDA can be obtained, put it into a 500ml flat bottom flask, add 12g of NaCl, and then add 230g of DOA, and use poly(IV) at room temperature The new low-viscosity liquid chain extender PUCURE was obtained by stirring with vinyl fluoride stirring blade at 50 r / min for 30 minutes.

[0014] Using the obtained crosslinking agent PUCURE to extend the chain of Adiprene, and comparing it with MOCA, the mechanical data of the obtained polyurethane elastomers are as follows:

[0015] Tensile Strength Elongation Hardness (Shore A) PUCURE 39 540 92 MOCA 49 420 72

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Abstract

The invention discloses a novel low-viscosity liquid polyurethane chain extender PUCURE which is prepared by taking diamine MDA as a basic raw material. The PUCURE is matched with a polyurethane prepolymer in an MDI system; MDA / NaCl is dispersed in dioctyl adipate (DOA); in the presence of NaCl, the DOA reacts with the MDA at room temperature and an amino group in the DMA can be sealed to lose activity (reactivity); and when the reaction system is heated to 115-160 DEG C, a sealing agent is released and the released high-activity amino group rapidly reacts with the prepolymer to generate a high-strength elastomer product. A mixture of the PUCURE and the corresponding prepolymer can be stored for more than one month at a temperature of below 50 DEG C; compared with the traditional curing agents (MOCA, BDO, etc.), a product cured by the PUCUR has excellent dynamic performance; and the PUCURE has the characteristics of low viscosity and delaying property of the system, so that the PUCURE is applicable to opening pouring, liquid injection molding, spin casting, dipping and other technologies; in addition, the PUCURE is also applicable to production of large-sized products with complicated structures and occasions with requirements on microwave curing, high stability and unfixed operating time.

Description

technical field [0001] The invention relates to a new process and a new product of a polyurethane chain extender. Background technique [0002] The traditional polyurethane industry widely uses MOCA as a chain extender. The chemical name of MOCA is 3,3′-dichloro-4,4′-diaminodiphenylmethane. It is currently the most commonly used aromatic diamine chain extender, and its sales volume has always been dominant. MOCA is mainly used as a chain extension curing agent for TDI-based prepolymers. It is widely used in machinery industry, automobile and aircraft manufacturing, mining and sports facilities, and various light industrial manufacturing industries. It can also be used as a cross-linking agent for PU coatings and adhesives. Coupling agent, epoxy resin curing agent and high electrical resistance products, etc. In use, it is found that MOCA is easy to cure in the liquid prepolymer, and pre-curing will cause the system not to cure or the performance of the product to deteriora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/43C07C231/02C08G18/38
Inventor 谢在玉李峰杨德军
Owner LUDONG UNIVERSITY
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