Foaming composition for water tank of solar water heater

A technology for solar water heaters and foaming compositions, which is applied in the field of compositions with polyether foaming agents as the main component, which can solve problems such as cracking, foam and shell peeling, bulging and corrugation, and achieve the effect of protecting the ecological environment

Inactive Publication Date: 2012-06-27
杜立立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, for solar water heaters, especially vacuum tube solar water heaters, polyurethane hard foam is mainly used as the insulation material of the water tank at present, because polyurethane hard foam has a low thermal conductivity and is easy to form, but one of the main defects of polyurethane hard foam is shrinkage after molding (The foam volume after the molding reaction is smaller than the maximum volume during the molding process), the existence of molding shrinkage often makes the final volume of the foam body smaller than the volume of the cavity filled, and the peeling phenomenon between the foam and the shell occurs; and because the polyurethane is hard The reason for the surface tension when the foam is foaming is that the connection between the cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, 5 parts of glycerol polyether resin, 3 parts of glycol ether resin, 0.2 part of foam stabilizer water-soluble silicone oil, 0.1 part of catalyst N, N-dimethylcyclohexylamine, 0.1 part of curing agent dibutyltin dilaurate, 10 parts of polyphenyl polyisocyanate, 3 parts of water, obtain polyurethane blowing agent after reaction, then add 5 kilograms of sodium bicarbonate according to 80 kilograms of polyurethane blowing agents, 5.5 kilograms of chitosan, 8 kilograms of hollow glass microspheres, then cast Put it into the solar water heater water tank and cure it for 5-10 hours to get a solar water heater water tank with good thermal insulation effect, which can be used after installing the vacuum tube.

Embodiment 2

[0025] First, 6 parts of glycerol polyether resin, 4 parts of glycol ether resin, 0.25 part of foam stabilizer water-soluble silicone oil, 0.2 part of catalyst N, N-dimethylcyclohexylamine, 0.25 part of curing agent dibutyltin dilaurate, 10 parts of polyphenyl polyisocyanates, 4 parts of water, obtain polyurethane blowing agent after reaction, then add 6 kilograms of sodium bicarbonate according to 70 kilograms of polyurethane blowing agents, 6 kilograms of chitosan, 6 kilograms of hollow glass microspheres, then cast Put it into the solar water heater water tank and cure it for 5-10 hours to get a solar water heater water tank with good thermal insulation effect, which can be used after installing the vacuum tube.

Embodiment 3

[0027] First, 7 parts of glycerol polyether resin, 5 parts of glycol ether resin, 0.3 part of foam stabilizer water-soluble silicone oil, 0.3 part of catalyst N, N-dimethylcyclohexylamine, 0.3 part of curing agent dibutyltin dilaurate, 10 parts of polyphenyl polyisocyanate, 5 parts of water, obtain polyurethane foaming agent after the reaction, then add 7 kilograms of sodium bicarbonate according to 85 kilograms of polyurethane foaming agents, 5 kilograms of chitosan, nanometer SiO 2 10 kg, then poured into the solar water heater water tank, and cured for 5-10 hours, a solar water heater water tank with good heat preservation effect can be obtained, which can be used after installing a vacuum tube.

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PUM

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Abstract

The invention discloses a foaming composition for a water tank of a solar water heater, which is characterized by comprising the following main raw materials: a polyether foaming agent, sodium bicarbonate, chitosan and hollow glass beads. The improved polyether rigid foam composition can be used for reducing the phenomena that after being sprayed from a glossy jar and formed, a polyurethane material has high contractibility, the heat preservation effect of the water tank of the solar water heater is influenced and the water tank is deformed, bulged and barred, or even cracked.

Description

technical field [0001] The invention relates to a thermal insulation material for a water tank of a solar water heater, in particular to a composition mainly composed of a polyether foaming agent. Background technique [0002] Due to the vigorous promotion of environmental protection and energy saving in the world, solar water heaters have become the main source of domestic hot water, and my country's solar water heaters have become the world's first user and producer of solar water heaters. As we all know, for solar water heaters, especially vacuum tube solar water heaters, polyurethane hard foam is mainly used as the insulation material of the water tank at present, because polyurethane hard foam has a low thermal conductivity and is easy to form, but one of the main defects of polyurethane hard foam is shrinkage after molding (The foam volume after the molding reaction is smaller than the maximum volume during the molding process), the existence of molding shrinkage often...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/48C08J9/08C08L5/08C08L75/08C08K7/28C08K3/36C08G101/00
Inventor 马昭键谢刚杨明慧
Owner 杜立立
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