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Modified isocyanate for cold curing high resilience foam plastic and preparation thereof

A technology of isocyanate and foamed plastics, applied in the field of preparation of modified MDI, can solve the problems of high density, poor elasticity and high closed cell rate

Active Publication Date: 2009-01-28
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is a modified MDI suitable for cold-cured high-resilience foam plastics and its preparation method, which solves the problems of poor elasticity, high density and closed The problem of high porosity

Method used

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  • Modified isocyanate for cold curing high resilience foam plastic and preparation thereof
  • Modified isocyanate for cold curing high resilience foam plastic and preparation thereof
  • Modified isocyanate for cold curing high resilience foam plastic and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Polyether polyol (molecular weight: 6000, primary hydroxyl content: 75%): 16.5; pure MDI: 40.5; PM-200 (produced by Yantai Wanhua Polyurethane Co., Ltd.): 42; modifier (L-1160, Momentive Produced by High-tech Materials Group): 1; Phosphoric acid: 10ppm by total mass.

[0020] Preparation: Add the polyether polyol based on the formula amount into the reaction kettle at room temperature, stir at 80°C, vacuum (-0.095Mpa) for dehydration and degassing for 2-3 hours, cool down to 15°C and add isocyanate, modifier , phosphoric acid, react at 80°C for 2-3 hours, cool down to 10-40°C, and pack into barrels.

[0021] When in use: Weigh the high-resilience composite material (A component) and modified MDI (B component) according to the index of isocyanic acid index 1.0, pour the measured A component and B component into a plastic beaker, After stirring for 4-6 seconds at a stirrer speed of 3000 rpm, pour it into a 300mmX300mmX10mm mold with a mold temperature of 50°C, close the ...

Embodiment 2

[0024] Polyether polyol (molecular weight: 7000, primary hydroxyl content: 70%): 22.5; MDI-50: 40; 44V20L (produced by Yantai Wanhua Polyurethane Co., Ltd.): 36; modifier (L-1163): 1.5; Phosphoric acid: 10PPM by total mass.

[0025] Preparation: Add the polyether polyol based on the formula amount into the reaction kettle at room temperature, stir at 100°C, vacuumize (-0.095Mpa) for dehydration and degassing for 2-3 hours, cool down to 40°C and add isocyanate, modifier , phosphoric acid, react at 85°C for 2-3 hours, cool down to 10-40°C, and pack into barrels.

[0026] When in use: Weigh the high-resilience composite material (A component) and modified MDI (B component) according to the index of isocyanic acid index 1.0, pour the measured A component and B component into a plastic beaker, After stirring for 4-6 seconds at a stirrer speed of 3000 rpm, pour it into a 300mmX300mmX10mm mold with a mold temperature of 50°C, close the mold immediately, open the mold in about 5 minu...

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Abstract

The invention relates to a modified MDI used for a cold curing high resilience foaming plastic. Isocyanate, PDG, a modifying agent and a polymerization inhibitor are taken as the materials, wherein, the isocyanate is a mixture of MDI and PAPI; the PDG has a functionality of three and the number average molecular weight of 5000 to 7000 as well as the weight content of hydroxyl stroma of 65 to 80 percent; glycerin is used as an initiator; the end of ethylene epoxide is sealed by PPOX trihydric alcohol; the modifying agent is modifiedsilicone PDG with a number average molecular weight of 2000 to 3000. When in use, the high resilience combined materials and the modified MDI are weighed according to an index that the index of isocyanic acid is 1.0, stirred and injected into a mold. Compared with a TDI system, the modified MDI of the invention has the advantages of lower cost, good hand feeling and similar elasticity. Compared with a coarse MDI system, the modified MDI has the advantages of better elasticity, better hand feeling, lower density and good opening performance.

Description

technical field [0001] The invention relates to a preparation method of modified MDI suitable for cold-cured high-resilience foam plastics. Background technique [0002] Polyurethane foam is a new type of polymer synthetic material. Since its industrialization in the 1950s, it has been developing at an astonishing speed, and has largely replaced kapok, cotton wool and other cushioning materials. With the continuous expansion of the application of polyurethane foam, various requirements are put forward for the performance of the product. [0003] Polyurethane cold-cured high-resilience foam plastics are widely used in automotive seat cushions and other fields due to their high resilience, high comfort, and high production efficiency. In recent years, the automobile industry has developed rapidly, and the market competition has also been intensified. Various models have been reduced in price. Under the premise of ensuring the original performance, reducing the cost of the who...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/48C08G18/08
Inventor 孙清峰栾森代金辉于鹏程鞠伟坦
Owner SHANDONG INOV POLYURETHANE
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