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Polyurethane elastomer

A technology of polyurethane elastomer and prepolymer, applied in the field of polyurethane elastomer, can solve problems such as difficulty in meeting the requirements of special fields, and achieve the effect of simple preparation process

Inactive Publication Date: 2011-07-20
WENZHOU HONGDELI RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the elongation of polyurethane elastomers provided in CN200710157802, CN200810036519, and CN200910021607.7 are all about 400-600%, and the largest ones only reach 800%, which is difficult to meet the requirements of some special fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Preparation of polyether polyols:

[0024] The polyether polyol in the present invention is obtained by adopting known ionic ring-opening polymerization method, and the specific method is: add 1,2-propylene glycol, potassium hydroxide 0.2% (based on the total amount of feed, potassium hydroxide The amount of addition is 0.2% of the total weight of 1,2-propylene glycol, propylene oxide and ethylene oxide), nitrogen replacement 3 times, then vacuumize, heat up to 80 ℃, and then slowly add propylene oxide and ethylene oxide Alkanes, the reaction pressure is kept below 0.44 MPa, the reaction temperature is controlled at 115 ± 2 ℃, after 4 hours of reaction, the temperature is lowered to 80-90 ℃, and the hydroxyl value is measured by sampling to obtain crude polyether. After measuring its hydroxyl value in the range of 55-57KOHmg / g, add an appropriate amount of pure water, 1.2% phosphoric acid, and 0.5% magnesium silicate (based on the total feeding amount) into t...

Embodiment 2

[0027] Example 2 Preparation of polyester polyol ：

[0028] The polyester polyol among the present invention adopts known polycondensation method to obtain, and the method that adopts is vacuum dehydration method. Weigh adipic acid, diethylene glycol and dipropylene glycol according to the ratio shown in Table 2, put the above-mentioned substances into the reaction kettle, first pass nitrogen gas for 10 min, remove the air in the system, and then protect it under nitrogen protection. Under heating and stirring, after the material is melted, 0.1% of the total weight of the material is added as a catalyst tetrabutyl titanate. Water begins to flow out at about 140°C, continue heating, and the theoretical water will finish when the temperature in the reactor reaches about 220°C. Keep warm for 2 hours after the water comes out, then stop the nitrogen flow. Start vacuuming step by step, the vacuum degree is 20 kPa, 1 h; 13.2 kPa, 1 h; 6.7 kPa, 1 h, sampling and analyzing acid. ...

Embodiment 3

[0033] The invention adopts the known prepolymer method to prepare the polyurethane elastomer, that is, first prepares the isocyanate prepolymer, and then performs chain extension to obtain the polyurethane elastomer.

[0034] The first step: dehydrate the complex polyol (the polyether polyol and polyester polyol prepared in Examples 1 and 2 in the ratio shown in Table 3) at 1 0 0 ~ 1 3 0 ℃ for 2 ~ 3 hours in vacuum dehydration, and then Cool to 50-60°C, quickly add liquid diisocyanate (2-5 times the molar weight of the complex polyol, see Table 3) under rapid stirring, after 30-40 min, at 80-85°C Insulate and react for 2 to 3 hours, take samples to analyze the content of free isocyanate groups, then vacuum defoam for 20 to 30 min, and seal and store for later use.

[0035] Step 2: Weigh 80-100g of isocyanic acid prepolymer, stir and heat up to 80-85°C, vacuum defoaming for 1-2 minutes, add a chain extender equivalent to NCO under rapid stirring MOCA, after stirring for about...

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Abstract

The invention belongs to the organic polymer compound field, and relates to a polyurethane elastomer, which is prepared by performing chain extension on isocyanic acid prepolymer prepared by the reaction of pluronic polyol and organic isocyanate; the pluronic polyol is composed of polyester polyol and polyether polyol; the polyester polyol is prepared by polycondensation of binary acid, dipropylene glycol and diethylene glycol; the polyether polyol is polymerized by ethylene oxide and / or propylene epoxide; the organic isocyanate is composed of aromatic isocyanate and aliphatic isocyanate; andthe chain extender used for extending chains is amine chain extender. The polyurethane elastomer of the invention starts out from the theory of structure and performance of polyurethane, adopts well-known prepolymer synthesis, and performs casting and moulding; the body is synthesized into an environment protected polyurethane elastomer without solvent; the polyurethane elastomer has super-high-limit elongation at break more than 1000%, and satisfies the applications in special fields of bonding, damping and sealing and the like.

Description

technical field [0001] The invention belongs to the field of organic high molecular compounds, and relates to a high molecular elastic body, specifically a polyurethane elastic body. Background technique [0002] In 1936, German chemist Otto Bayer synthesized a polymer with a chain segment containing a carbamate characteristic group in the process of studying the addition polymerization of isocyanate. Since polyurethane (PU) has excellent comprehensive physical properties, it can be made into products for different purposes such as elastomers, coatings, fibers, and adhesives. Therefore, in the following decades, the polyurethane industry has developed extremely rapidly, and it has now become the world's top five One of plastic. However, polyurethane elastomer materials require ultra-high elongation (greater than 1000%) in some application fields. In order to achieve this goal, formula and process system design can be carried out through the correlation between structure and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C08G65/28C08G63/672
Inventor 张晓隆姚克俭赵波峰赵敏
Owner WENZHOU HONGDELI RESIN