Flame-retardant polyether glycol and preparation method thereof, combined polyether and polyurethane foam

A technology of polyether polyol and combination polyether, which is applied in ether preparation, alkylene oxide preparation ether, organic chemistry, etc., can solve the problems of poor flame retardancy and high smoke density, and achieve simple operation, good flame retardancy, good The effect of dimensional stability

Inactive Publication Date: 2011-05-25
SHANGHAI DONGDA POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of poor flame retardancy or high smoke density of existing polyether polyols, and provide a

Method used

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  • Flame-retardant polyether glycol and preparation method thereof, combined polyether and polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of polyether polyol

[0036] Add 0.330 parts of tetrabromophthalic anhydride diol PHT4-Diol, 0.152 parts of glycerin and 0.01 parts of triethylamine into the batch reactor, replace with nitrogen for 3 times, then raise the temperature to 120°C, and continuously feed 0.518 parts of epichlorohydrin, Keep the pressure of the reaction system not exceeding 0.4MPa during the feeding process, complete the feeding within 3.5 hours, then keep the temperature at 120°C for 6 hours, control the temperature at 110°C and vacuumize to remove unreacted epichlorohydrin, cool down and discharge The polyether polyol can be obtained, and the yield is more than 98%.

[0037] The hydroxyl value of the obtained polyether polyol is 350 mgKOH / g, the viscosity is 15000 mp.s (25°C), the water content is ≤0.15%, and the number average molecular weight is 450.

[0038] 2. Combined polyether:

[0039] 100 grams of polyether polyol prepared above, 2 grams of foam stabilizer, 1.8 gram...

Embodiment 2

[0043] 1. Preparation of polyether polyols

[0044] Add 0.491 parts of tetrabromophthalic anhydride diol PHT4-Diol, 0.196 parts of sorbitol and 0.008 parts of trimethylamine in the batch reactor, replace it with nitrogen for 3 times, heat up to 110°C, and continuously feed 0.313 parts of propylene oxide. Keep the pressure of the reaction system not exceeding 0.4MPa during the feeding process, complete the passage within 2.5 hours, and then keep the temperature at 110°C for 5.5 hours, control the temperature at 110°C and vacuumize to remove unreacted propylene oxide. Ether polyol, yield ≥ 98%.

[0045] The hydroxyl value of the obtained polyether polyol is 400 mgKOH / g, the viscosity is 50000 mp.s (25°C), the water content is ≤0.15%, and the number average molecular weight is 650.

[0046] 2. Combined polyether:

[0047] 100 grams of polyether polyol prepared above, 2 grams of foam stabilizer, 1.8 grams of water, 1.7 grams of N,N-dimethylcyclohexylamine and 24 grams of blowing...

Embodiment 3

[0051] 1. Preparation of polyether polyols

[0052] Add 0.475 parts of tetrabromophthalic anhydride diol PHT4-Diol, 0.119 parts of pentaerythritol and 0.015 parts of trimethylamine into the batch reactor, replace it with nitrogen three times, raise the temperature to 115°C, and continuously feed 0.594 parts of propylene oxide. During the process, keep the pressure of the reaction system not exceeding 0.4MPa, and then pass through within 3 hours, keep the temperature at 115°C for 5 hours, control the temperature at 110°C and vacuumize to remove unreacted propylene oxide, cool down and discharge the material to obtain the polymer Ether polyol, yield ≥ 98%.

[0053] The hydroxyl value of the obtained polyether polyol is 300mgKOH / g, the viscosity is 35000mp.s (25°C), the pH value is 8-10, the water content is ≤0.15%, and the number average molecular weight is 575.

[0054] 2. Combined polyether:

[0055] 100 grams of polyether polyol prepared above, 2 grams of foam stabilizer, 1...

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Abstract

The invention provides a method for preparing flame-retardant polyether glycol, which comprises the step of: under the oxygen-free condition in the atmosphere of inert gas and the action of weak amine catalyst, performing opening polymerization reaction on polyol having the functionality of 3 to 8 and tetrabromo phthalic anhydride-diol, which are used as compound starting agents, and an epoxy compound. The flame-retardant polyether glycol overcomes the defect of low fire retardance of the conventional polyether glycol, and has better fire retardance; the polyurethane hard foam plastic prepared from the flame-retardant polyether glycol has higher oxygen index (more than 25), lower smoke density and perfect size stability (the linear shrinkage rate of the plastic after being frozen at -30 DEG C for 24 hours is -0.13 to -0.25 percent), and has outstanding economic benefit and social benefit. The preparation method for the polyether glycol is simple in operation, and the yield rate is over 98 percent.

Description

technical field [0001] The invention relates to a polyether polyol and a preparation method thereof, and also relates to a combination polyether containing the polyether polyol and polyurethane rigid foam obtained by foaming the combination polyether. Background technique [0002] Polyether polyols are mainly used in the production of polyurethane foams, elastomers, adhesives and coatings. Polyether polyol is referred to as polyether, also known as polyalkylene ether or polyoxyalkylene, which is prepared by ring-opening polymerization of epoxy compounds in the presence of active hydrogen-containing compounds as initiators and catalysts. Commonly used epoxy compounds are propylene oxide (PO), tetrahydrofuran and ethylene oxide (EO). Polyoxypropylene ether polyols (including ethylene oxide-terminated active polyethers) are the most widely used raw material intermediates in the polyurethane industry. This type of polyether is mainly used in the production of polyurethane foam...

Claims

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Application Information

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IPC IPC(8): C07C43/11C07C41/03C08G18/48C08L75/08C08G101/00
Inventor 李心强董建国曹小伟王锋
Owner SHANGHAI DONGDA POLYURETHANE
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