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Flame retardant modified MDI and preparation method thereof

A modification and modifier technology, applied in the field of flame retardant modified MDI and its preparation, can solve the problems of harsh storage and use conditions and operating process requirements, and achieve the effects of not easy to ignite and improved flame retardancy

Active Publication Date: 2013-04-03
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology uses flame-retardant polymer polyols to prepare component A materials, thereby endowing polyurethane foam with flame-retardant properties, but this technology requires that component B materials must use TDI systems, and component A materials are also poor in storage stability. There are certain problems, and there are strict requirements on the storage conditions and operation process

Method used

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  • Flame retardant modified MDI and preparation method thereof
  • Flame retardant modified MDI and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 8.1Kg reactive flame retardant modifier RB-79 and 4.9Kg high molecular weight reactive cell opener DK-12 into the reaction kettle, stir and heat up to 110°C, adjust the vacuum degree to -0.095MPa, and dehydrate for 2 hours while stirring , and then lower the temperature to 40°C, add 2g of phosphoric acid and stir evenly, and keep it sealed. Add 28.5Kg of pure MDI, 26Kg of MDI-50 and 32.5Kg of PM-200 into the reaction kettle, add the dehydrated mixed modifier while stirring, slowly raise the temperature to 65°C, keep the temperature for 2 hours, and take samples for detection NCO% was 26.8, cooled to 45°C, discharged and sealed for storage.

Embodiment 2

[0018] Add 10.4Kg of reactive flame retardant modifier RB-7980 and 4Kg of high molecular weight reactive pore opener DK-12 into the reactor, stir and heat up to 100°C, adjust the vacuum to -0.095MPa, and dehydrate for 2 hours while stirring. Then lower the temperature to 40° C., add 1.8 g of phosphoric acid, stir evenly, and seal it for storage. Add 28Kg of pure MDI, 25.6Kg of MDI-50 and 32Kg of PM-200 into the reaction kettle, add the dehydrated mixed modifier while stirring, slowly raise the temperature to 70°C, keep the temperature for 1.5 hours, and take samples to detect NCO % was 26.5, cooled to 45°C, discharged and sealed for storage.

Embodiment 3

[0020] Add 3.9Kg of reactive flame retardant modifier RB-79, 5.5Kg of RB-7970, and 6.3Kg of high molecular weight reactive cell opener DK-12 into the reactor, stir and raise the temperature to 100°C, and adjust the vacuum degree to -0.095MPa , dehydrated for 2 hours while stirring, then cooled to 40°C, added 1.5g of phosphoric acid and stirred evenly, sealed and stored. Add 27.6Kg of pure MDI, 25.2Kg of MDI-50 and 31.5Kg of PM-200 into the reaction kettle, add the dehydrated mixed modifier while stirring, slowly raise the temperature to 80°C, keep the temperature for 1 hour, and take a sample The NCO% was detected to be 26.1, the temperature was lowered to 45°C, and the material was discharged and sealed for storage.

[0021]

[0022] The formula of high resilience A material used above is as follows (by weight percentage):

[0023]

[0024]

[0025] Compared with the existing modified MDI product (patent CN101353413 product), the present invention has simil...

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Abstract

The invention belongs to the technical field of polyurethane synthesis, and particularly relates to flame retardant modified MDI (diphenylmethane diisocyanate) and a preparation method thereof. The flame retardant modified MDI is prepared through reaction of isocyanate, reaction type flame retardant modifier, high molecular weight reaction type opening agent and storage stabilizer; by taking the total mass of isocyanate, the reaction type flame retardant modifier and the high molecular weight reaction type opening agent as 100%, the mass percent of isocyanate is 76-88%, the mass percent of the reaction type flame retardant modifier is 8-14%, and the mass percent of the high molecular weight reaction type opening agent is 4-10%; the storage stabilizer accounts for 15-20 ppm of the total weight of isocyanate, the reaction type flame retardant modifier and the high molecular weight reaction type opening agent; and isocyanate is the mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in mass ratio of 0.8-1.8 to 1. Foam prepared by the modified MDI has greatly improved fire resistance, is hardly ignited at first, and is extinguished immediately when out of flame after long-time ignition.

Description

technical field [0001] The invention belongs to the technical field of polyurethane synthesis, and in particular relates to a flame-retardant modified MDI and a preparation method thereof. Background technique [0002] Polyurethane cold-cured high-resilience foam plastic is a new type of polymer synthetic material. It is widely used in civil fields such as automobiles, sofas, and mattresses because of its high elasticity, high comfort, and high production efficiency. At present, in the synthesis of cold-cured high-resilience foam plastics, TDI system, TDI / MDI mixed system and modified MDI system are generally used as component B materials. Due to the high cost and high toxicity of TDI system and TDI / MDI mixed system, there are too many negative effects in the operation process, and the usage is gradually decreasing. The modified MDI system can solve these problems very well. However, with the development of society and the continuous occurrence of fire accidents in recent y...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G101/00
Inventor 李健孙兆任孙清峰栾森
Owner SHANDONG INOV POLYURETHANE
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