Polyurethane composite heat-insulating material for solar heat-insulating water tank
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A technology of composite thermal insulation materials and thermal insulation water tanks, which is applied in the field of thermal insulation materials, can solve the problems of reducing polyurethane thermal insulation performance, non-flame retardancy, and fire, and achieve the effects of improved thermal insulation performance, excellent flame retardancy performance, and gentle response speed
Inactive Publication Date: 2018-01-23
NANNING KEYU ENERGY TECH CO LTD
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[0003] Polyurethane is a kind of widely used polymer material. By adjusting the molecular chain structure or adding inorganic and organic fillers, the strength of the material can be improved, but at the same time, the insulation performance of polyurethane is inevitably reduced.
In addition, polyurethane rigid foam also has the disadvantage of no flame retardancy. Since some solar water heaters are equipped with electric heaters, if the circuit is aging, it will cause a short circuit and cause a fire. Polyurethane rigid foam is a substance that is easy to burn, so the polyurethane rigid foam is easy to burn. Only by making the foam flame retardant can it avoid the phenomenon of easy burning
Method used
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Embodiment 1
[0024] Weigh 90 parts of composite polyether polyol, 110 parts of isocyanate, 1 part of nano kaolin, 2 parts of foaming agent, 0.1 part of foam stabilizer, 0.5 part of catalyst, 0.5 part of crosslinking agent and 0.1 part of composite flame retardant according to the number of parts by mass. share.
[0025] (1) Add composite polyether polyol and nano kaolin into the reactor according to the formula ratio, adjust the rotating speed of the agitator to keep it at 2000r / min, and make it mix evenly;
[0026] (2) Add foaming agent, foam stabilizer, catalyst, crosslinking agent, composite flame retardant and appropriate amount of water into the reactor, and mix evenly with a mixer;
[0027] (3) Finally, add isocyanate into the reactor and stir to mix evenly. When the mixture in the reactor produces bubbles and the color of the foam turns white, it is immediately injected into the cavity of the solar water heater tank for foaming. After curing at high temperature, it can be obtained ...
Embodiment 2
[0029] Weigh 95 parts of composite polyether polyol, 120 parts of isocyanate, 2 parts of nano kaolin, 3 parts of foaming agent, 0.2 part of foam stabilizer, 1 part of catalyst, 0.6 part of crosslinking agent and 0.2 parts of composite flame retardant according to the number of parts by mass. share.
[0030] The preparation process is the same as in Example 1.
Embodiment 3
[0032] Weigh 98 parts of composite polyether polyol, 125 parts of isocyanate, 2.5 parts of nano kaolin, 4 parts of foaming agent, 0.4 part of foam stabilizer, 2 parts of catalyst, 0.8 part of crosslinking agent and 0.3 parts of composite flame retardant according to the number of parts by mass. share.
[0033] The preparation process is the same as in Example 1.
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Abstract
The invention discloses a polyurethane composite heat-insulating material for a solar heat-insulating water tank. The polyurethane composite heat-insulating material for the solar heat-insulating water tank is characterized by being prepared from the following components in parts by weight: 90 to 100 parts of compound polyether polyol, 110 to 130 parts of isocyanate, 1 to 3 parts of nano-kaolin, 2to 5 parts of a foaming agent, 0.1 to 0.5 parts of a foam stabilizing agent, 0.5 to 3 parts of a catalyst, 0.5 to 1 part of a cross-linking agent, and 0.1 to 0.5 part of a composite flame retardant,wherein the compound polyether polyol comprises sorbitol polyether polyol, glycerol polyether polyol and diphenylmethane diamine polyether polyol. The tensile strength and the compressive strength ofthe polyurethane composite heat-insulating material are enhanced, the defect of high contractility after the polyurethane composite heat-insulating material is foamed and formed is overcome, and meanwhile, the heat conductivity coefficient of the polyurethane composite heat-insulating material is reduced, and the heat insulating property is improved by optimizing a basic formula, adopting the compound polyether polyol and adding the nano-kaolin.
Description
technical field [0001] The invention relates to the technical field of thermal insulation materials, and more specifically relates to a polyurethane composite thermal insulation material applied to the thermal insulation of solar water heater tanks. Background technique [0002] With the increasing shortage of energy and the increasing pressure on environmental protection, countries around the world have begun to promote the development of renewable energy, among which solar energy is the most widely used and developed renewable energy with the best development prospects, and has been widely used in various industries , the solar water heater industry is one of them. Our country is rich in solar energy resources and has broad prospects for solar energy utilization. At present, it is the first user and producer of solar water heaters in the world. As we all know, for solar water heaters, the selection of water tank insulation materials is very important. At present, the insu...
Claims
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