Three-element composite foaming agent, rigid polyurethane foam and preparation method of igid polyurethane foam

Abstract

The invention provides a three-element composite foaming agent. The tthree-element composite foaming agent comprises the following three components in parts by mass: 9-1 parts of cyclopentane, 5-1 parts of isopentane and 2-32 parts of trifluorochloroethylene LBA. Rigid polyurethane foam prepared by adopting the three-element composite foaming agent comprises the following components in parts by weight: 100 parts of premixed polyether polyol, 10-26 parts of the three-element composite foaming agent and 120-150 parts of isocyanate. The invention also provides a preparation method of the rigid polyurethane foam. The three-element foaming process provided by the invention has the advantages that the heat conducting coefficient of the polyurethane foam can be effectively reduced, and the energy consumption of an electric refrigerator can be reduced; the strength of pressure foam under the same density is enhanced, the foam density needed by the electric refrigerator can be reduced, so that the injection dosage of the whole electric refrigerator can be reduced; when the needed amount of the electric refrigerator is fixed, the waste of raw materials is reduced, simultaneously the production of the rigid polyurethane foam hard to treat is also reduced, and the pollution to the environment is reduced; the curing time of the foam is shortened by 10%-15%, and the production efficiency is improved.

Description

technical field

[0001] The invention belongs to the technical field of foaming thermal insulation materials, and in particular relates to a ternary combination foaming agent, polyurethane rigid foam made by using the ternary combination foaming agent and a manufacturing method of the polyurethane rigid foam. Background technique

[0002] Traditional refrigerators use a single-component alkane physical foaming agent. When foaming, isocyanate and polyether polyol react to form polyurethane rigid foam. The thermal conductivity is high, the compressive strength is low, the core density of foam products is high, and raw material consumption The quantity is large and the production cycle is slow, resulting in high manufacturing costs.

[0003] At present, some refrigerators are manufactured using multi-component physical foaming agents, such as the mixed foaming process of pentane and pentafluoropropane, using the low boiling point (15.3°C) of the third-generation foaming agent HF...

Examples

Embodiment 1

[0031] The mass part formula of polyurethane rigid foam:

[0032] White material: 100 parts of combined polyether, 9 parts of cyclopentane, 4.5 parts of isopentane, 3.5 parts of trifluorochloroethylene LBA;

[0033] Black material: 137 parts of isocyanate (PMDI).

[0034] The manufacturing steps of polyurethane rigid foam are as follows:

[0035] The S1 combined polyether is delivered to the static mixer through the delivery pump;

[0036] S2 Send cyclopentane and isopentane to the static mixer with a circulating pump, and transport trifluorochloroethylene LBA to the static mixer with a circulating pump. The above mixture is uniformly mixed in the static mixer, and the temperature is controlled at 22°C , pressure 2bar;

[0037] S3 Mix the mixture and isocyanate in the static mixer evenly, and then use a high-pressure foaming machine to inject into the refrigerator for foaming reaction at a temperature of 20° C. and a pressure of 130 bar to obtain rigid polyurethane foam.

...

Embodiment 2

[0041] The mass part formula of polyurethane rigid foam:

[0042] White material: 100 parts of combined polyether, 8.5 parts of cyclopentane, 4.5 parts of isopentane, 5.5 parts of trifluorochloroethylene LBA;

[0043] Black material: 140 parts of isocyanate (PMDI).

[0044] The manufacture step of present embodiment is the same as embodiment 1, and the average core density of the polyurethane rigid foam that makes is 29.8kg / m 3 , The average compressive strength is 171kpa, the minimum compressive strength is 155kpa, the average shrinkage rate is 1.2%, the maximum shrinkage rate is 3.7%, and the thermal conductivity is 18.5mW / m·k.

Embodiment 3

[0046] The mass part formula of polyurethane rigid foam:

[0047] White material: 100 parts of combined polyether, 8.5 parts of cyclopentane, 4.5 parts of isopentane, 7 parts of trifluorochloroethylene LBA;

[0048] Black material: 142 parts of isocyanate (PMDI).

[0049] The manufacture step of present embodiment is the same as embodiment 1, and the average core density of the polyurethane rigid foam that makes is 29.4kg / m 3, The average compressive strength is 166kpa, the minimum compressive strength is 152kpa, the average shrinkage rate is 1.4%, the maximum shrinkage rate is 4.5%, and the thermal conductivity is 18.2mW / m·k.

technical field

[0001] The invention belongs to the technical field of foaming thermal insulation materials, and in particular relates to a ternary combination foaming agent, polyurethane rigid foam made by using the ternary combination foaming agent and a manufacturing method of the polyurethane rigid foam. Background technique

[0002] Traditional refrigerators use a single-component alkane physical foaming agent. When foaming, isocyanate and polyether polyol react to form polyurethane rigid foam. The thermal conductivity is high, the compressive strength is low, the core density of foam products is high, and raw material consumption The quantity is large and the production cycle is slow, resulting in high manufacturing costs.

[0003] At present, some refrigerators are manufactured using multi-component physical foaming agents, such as the mixed foaming process of pentane and pentafluoropropane, using the low boiling point (15.3°C) of the third-generation foaming agent HF...

Examples

Embodiment 1

[0031] The mass part formula of polyurethane rigid foam:

[0032] White material: 100 parts of combined polyether, 9 parts of cyclopentane, 4.5 parts of isopentane, 3.5 parts of trifluorochloroethylene LBA;

[0033] Black material: 137 parts of isocyanate (PMDI).

[0034] The manufacturing steps of polyurethane rigid foam are as follows:

[0035] The S1 combined polyether is delivered to the static mixer through the delivery pump;

[0036] S2 Send cyclopentane and isopentane to the static mixer with a circulating pump, and transport trifluorochloroethylene LBA to the static mixer with a circulating pump. The above mixture is uniformly mixed in the static mixer, and the temperature is controlled at 22°C , pressure 2bar;

[0037] S3 Mix the mixture and isocyanate in the static mixer evenly, and then use a high-pressure foaming machine to inject into the refrigerator for foaming reaction at a temperature of 20° C. and a pressure of 130 bar to obtain rigid polyurethane foam.

...

Embodiment 2

[0041] The mass part formula of polyurethane rigid foam:

[0042] White material: 100 parts of combined polyether, 8.5 parts of cyclopentane, 4.5 parts of isopentane, 5.5 parts of trifluorochloroethylene LBA;

[0043] Black material: 140 parts of isocyanate (PMDI).

[0044] The manufacture step of present embodiment is the same as embodiment 1, and the average core density of the polyurethane rigid foam that makes is 29.8kg / m 3 , The average compressive strength is 171kpa, the minimum compressive strength is 155kpa, the average shrinkage rate is 1.2%, the maximum shrinkage rate is 3.7%, and the thermal conductivity is 18.5mW / m·k.

Embodiment 3

[0046] The mass part formula of polyurethane rigid foam:

[0047] White material: 100 parts of combined polyether, 8.5 parts of cyclopentane, 4.5 parts of isopentane, 7 parts of trifluorochloroethylene LBA;

[0048] Black material: 142 parts of isocyanate (PMDI).

[0049] The manufacture step of present embodiment is the same as embodiment 1, and the average core density of the polyurethane rigid foam that makes is 29.4kg / m 3, The average compressive strength is 166kpa, the minimum compressive strength is 152kpa, the average shrinkage rate is 1.4%, the maximum shrinkage rate is 4.5%, and the thermal conductivity is 18.2mW / m·k.