Preparation method of1,5-naphthalene diisocyanate-based polyurethane microcellular elastomer

A technology of naphthalene diisocyanate and microporous elastomer, applied in 1 field, can solve the problems of high hardness, reduce other properties of products, affect product performance and service life, etc., and achieve the effect of expanding application scope and reducing hardness

Inactive Publication Date: 2012-05-02
POLYMERCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the usual preparation method, commercially available polyester polyols such as: poly(adipate-1,4-butylene glycol) ester, polyethylene adipate, etc. components, but sometimes the product has the disadvantage of high hardness and is not suitable for application requirements
In order to overcome the above shortcomings, the usual method is to add a certain amount of external plasticizer, but this method will reduce other properties of the product; in addition, technically speaking, adding external plasticizer will inevitably Migration and extraction occur, thereby affecting the performance and service life of the product to a greater extent

Method used

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  • Preparation method of1,5-naphthalene diisocyanate-based polyurethane microcellular elastomer
  • Preparation method of1,5-naphthalene diisocyanate-based polyurethane microcellular elastomer
  • Preparation method of1,5-naphthalene diisocyanate-based polyurethane microcellular elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1000g molecular weight is 2000 polyadipate-butylene glycol ester and 286g NDI react 1h at 130 ℃ to obtain the prepolymer of-NCO%=5.64%; Chain extender component contains 20g 1,4-butanediol, 51g 4,4'-bis-sec-butylaminodiphenylmethane, 9g water, 10g composite catalyst, 15g surfactant; using a low-pressure foaming machine, mix the prepolymer and crosslinking agent according to the ratio of isocyanate index equal to 1 Components: inject the reaction material liquid into a mold at 80-110°C to manufacture microporous elastomer products, demould after 20-40 minutes, and then put it into an oven at 110°C for post-aging for 18 hours.

[0037] The product prepared according to this example was placed at room temperature for one week, and then its mechanical properties and hardness were measured.

[0038] Test mechanical properties with comparative example 1.

[0039] Test hardness with comparative example 1.

[0040] The test results are shown in Table 1.

Embodiment 2

[0042] 1000g of polyadipate-neopentyl glycol with a molecular weight of 2000 and 234g of NDI were reacted at 130°C for 1h to obtain a prepolymer with -NCO%=4.2%; the chain extender component contained 20g of 1,4-butanediol , 10g dimethylthiotoluenediamine, 9.25g N-N'di-sec-butyl-p-phenylenediamine, 5.4g water, 10g composite catalyst, 15g surfactant; using a low-pressure foaming machine, according to the isocyanate index is equal to 1 Mix the prepolymer and crosslinking agent components, inject the reaction material liquid into the mold at 80-110°C to make microporous elastomer products, demould after 20-40min, and then put it in an oven at 110°C for post-curing 18 hours.

[0043] The product prepared according to this example was placed at room temperature for one week, and then its mechanical properties and hardness were measured.

[0044] Test mechanical properties with comparative example 1.

[0045] Test hardness with comparative example 1.

[0046] The test results are...

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Abstract

The invention discloses a preparation method of a 1,5-naphthalene diisocyanate-based polyurethane microcellular elastomer. The preparation method comprises the following steps of: 1, dewatering polymer polyhydric alcohol by stirring under a vacuum condition at 80 to 150 DEG C; 2, under the protection of nitrogen, reacting excessive 1,5-naphthalene diisocyanate-based polyurethane with the polymer polyhydric alcohol at 100 to 150 DEG C so as to generate a prepolymer containing redundant -NCO groups; 3, performing chain extension by adopting a full pre-polymerization method, mixing a prepolymer component with a chain extender component according to a proportion, and stirring at a high speed, injecting the mixture solution into a mould of which the temperature is between 80 and 110 DEG C, and demoulding after precuring for 10 to 60 minutes, wherein the chain extender component does not contain the polymer polyhydric alcohol; and 4, post-curing the product subjected to demoulding, for 13 to 18 hours at 100 to 120 DEG C. The 1,5-naphthalene diisocyanate-based polyurethane microcellular elastomer prepared by using the method disclosed by the invention is used as a high-strength damping material for bearing dynamic fatigue, such as buffering damping components of an elevator motor and other equipment which can easily generate acting force with a certain frequency.

Description

technical field [0001] The invention relates to a polyurethane microcellular elastomer, in particular to a preparation method of a 1,5-naphthalene diisocyanate-based polyurethane microcellular elastomer. Background technique [0002] Polyurethane microcellular elastomer is a block polymer composed of soft segments and hard segments alternately. Its properties are between rubber and plastics, and it is especially suitable for cushioning and other damping systems. Excellent dynamic and static mechanical properties and cheap and convenient processing methods all determine its importance in the field of industrial applications in our country. Products with different mechanical properties and processing properties can be produced by using different types of raw materials or various chemical structural components with different mixing ratios under the same raw material. NDI-based polyurethane microcellular elastomers have excellent dynamic mechanical properties and pressure defor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32C08G18/10
Inventor 滕鑫顾晓军
Owner POLYMERCHEM
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