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Rigid foam composite polyether polyol and preparation method thereof

A polyether polyol and composite polyether technology, which is applied in the field of chemical synthesis, can solve the problems of easy cracking, poor mechanical properties and poor dimensional stability of polyurethane rigid foams, and achieves good dimensional stability, strong mechanical properties, The effect of low production cost

Active Publication Date: 2018-05-18
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyurethane rigid foam prepared by this cross-linking agent / chain extender is easy to crack, poor in molding, poor in finish, poor in mechanical properties, poor in dimensional stability, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of the rigid foam composite polyether polyol of the present application comprises mixing the polyether polyol starting agent and the polyether polyether which accounts for 0.2% to 0.25% of the total mass of the polyether polyol mixing initiator and the epoxy compound Polyol synthesis catalyst KOH, under the conditions of reaction temperature of 80-135°C and reaction pressure of no more than 0.4Mpa, gradually feeds propylene oxide to make it undergo ring-opening polymerization to obtain the composite polyether polyol; Ether polyol mixed initiators include polyether triols with a molecular weight of about 500 using glycerin as a starter and polyether diols with a molecular weight of about 400 using propylene glycol as a starter. The polyether triols and polyols The mass ratio of ether diol is (3-6):1, and the mass ratio of propylene oxide and polyether polyol mixed starter is (4.2-5.3):1.

[0035] In some embodiments, the polyether polyol mixed init...

Embodiment 1

[0065] 76g of polyether diol (molecular weight: 400, self-produced by our company) that has been treated by dehydration and drying, the starter in the polyether diol is propylene glycol, and 228g of polyether ternary alcohol that has been treated by dehydration and drying Alcohol (molecular weight is 500, self-produced by our company), the initiator in its polyether trihydric alcohol is glycerin, add in the reaction kettle respectively, then add 3g potassium hydroxide catalyst, negative pressure and positive pressure are alternately replaced twice, Finally, under the condition of negative pressure of -0.1MPa, start stirring, heat up to 80°C while stirring, suspend heating, and then quickly add propylene oxide into the reaction kettle, and the predetermined amount is 1 / 3 of the total amount of propylene oxide one. When the propylene oxide is pre-dropped before the feed, when the pressure in the reactor reaches a positive pressure, the feed is suspended, and the reaction is obse...

Embodiment 2

[0067] 76g of polyether diol (molecular weight: 400, self-produced by our company) that has been treated by dehydration and drying, the initiator in the polyether diol is propylene glycol, and 298g of polyether ternary alcohol that has been treated by dehydration and drying Alcohol (molecular weight is 500, self-produced by our company), the initiator in its polyether trihydric alcohol is glycerin, add in the reaction kettle respectively, then add 4g potassium hydroxide catalyst, negative pressure and positive pressure are alternately replaced twice, Finally, under the condition of negative pressure of -0.1MPa, start stirring, heat up to 80°C while stirring, suspend heating, and then quickly add propylene oxide into the reaction kettle, and the predetermined amount is 1 / 3 of the total amount of propylene oxide one. When the propylene oxide is pre-dropped before the feed, when the pressure in the reactor reaches a positive pressure, the feed is suspended, and the reaction is ob...

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Abstract

The invention relates to a preparation method of rigid foam composite polyether polyol. The method comprises the steps that a polyether polyol mixed initiator and a polyether polyol synthetic catalystare gradually introduced into an epoxy compound on the conditions that the reaction temperature is 80-135 DEG C, and the reaction pressure does not exceed 0.4 Mpa, the mixture is subjected to ring-opening polymerization, and the composite polyether polyol is obtained; the polyether polyol mixed initiator comprises polyether triols taking glycerin as an initiator and polyether diols taking propylene glycol as an initiator, and the mass ratio of polyether triols to polyether diols is (3-6):1. The rigid foam composite polyether polyol has the advantages of being low in viscosity, high in degreeof functionality, high in reactivity and the like, and rigid foam plastic polyurethane prepared by taking the composite polyether polyol as a cross-linking agent has the excellent surface performanceand strength.

Description

technical field [0001] The application relates to the technical field of chemical synthesis, and is applied to industries such as crosslinking agents and chain extenders, and specifically relates to a preparation method of rigid foam composite polyether polyol. Background technique [0002] Polyurethane foam is made of polyisocyanate and hydroxyl compound through polymerization and foaming. By changing the type and composition of raw materials, the shape and performance of the product can be greatly changed, and polyurethane foam products from soft to hard can be obtained. Among them, polyurethane rigid foam is widely used in various insulation fields such as home appliances, building panels, pipes, and exterior wall spraying because of its good physical and mechanical properties, acoustic properties, and chemical resistance, especially its extremely low thermal conductivity. [0003] In the preparation of rigid polyurethane foam, crosslinking agents are used to generate che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/48C08G101/00
CPCC08G18/4812C08G65/2609C08G2110/0025
Inventor 董建国赵鑫黄丹丹韩明田杜辉李学庆
Owner SHANGHAI DONGDA CHEM
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