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Polylol for foamed plastic and polyisocyanurate foamed plastic adopting same

A technology of polyisocyanurate and foamed plastics, which is applied in the field of polyisocyanurate foamed plastics and polyols for foamed plastics, can solve the problems of increasing foam brittleness, high cost, decreased foam molding performance, etc. The effect of flame retardant properties

Inactive Publication Date: 2012-11-07
HONGBAOLI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additive flame retardants, such as halogenated phosphates, chlorinated paraffins, aluminum hydroxide, etc., tend to greatly reduce the physical and mechanical properties of the material, and as the addition time increases, the flame retardants in the material migrate and make the material The flame retardant performance of the reactive flame retardant is reduced; while the reactive flame retardant overcomes the above shortcomings, but there are disadvantages such as high cost and poor storage stability of the reaction raw materials.
In addition, excessive isocyanate can generate a large number of heterocyclic structures containing isocyanurate, which improves the flame retardancy of the foam material, but too much isocyanate will increase the fragility of the foam and reduce the fluidity of the foam, thereby reducing the foam and substrate. Cohesiveness, but also greatly reduces the formability of the foam

Method used

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  • Polylol for foamed plastic and polyisocyanurate foamed plastic adopting same
  • Polylol for foamed plastic and polyisocyanurate foamed plastic adopting same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 180g of paraformaldehyde, 126g of melamine and 120g of water into a reactor with a stirrer and temperature control, adjust the reaction system to a pH value of 8 to 8.5 with 20% potassium hydroxide, raise the temperature to 70°C, and keep warm After 3 hours, the white solid of methylolated melamine with a methylolation degree of 5.85 was refined; 224 g of methanol was added to the white solid of methylolated melamine, the reaction temperature was controlled at 40°C, and the reaction system was adjusted to pH=3.5 with formic acid , heated up to 65°C, and kept warm for 6 hours. After testing, a clear liquid of methylolated melamine with 75% of the methylol groups blocked by methanol was obtained; then 184g of diethanolamine was added, and the reaction system was adjusted to pH=8.3 with formic acid to control the reaction. Keep the temperature at 70°C for 6 hours; raise the temperature to 100°C, vacuumize under the condition of -0.02~-0.1MPa to remove small molecules fo...

Embodiment 2

[0040] Add 180g of paraformaldehyde, 126g of melamine and 110g of water into a reactor with a stirrer and temperature control, adjust the reaction system to a pH value of 8 to 8.5 with 20% potassium hydroxide, raise the temperature to 70°C, and keep warm After 2.8 hours, a white solid of methylolated melamine with a degree of methylolation of 5.75 was refined; 205 g of methanol was added to the white solid of methylolated melamine, the reaction temperature was controlled at 40°C, and the reaction system was adjusted to pH=3.5 with hydrochloric acid , heat up to 68°C and keep warm for 6 hours. After testing, a clear liquid of methylolated melamine with 80% of the methylol groups blocked by methanol is obtained; then add 169g of diethanolamine, and adjust the reaction system to pH=8.4 with hydrochloric acid to control the reaction. Keep the temperature at 70°C for 6 hours; raise the temperature to 105°C, vacuumize under the condition of -0.02~-0.1MPa to remove small molecules for...

Embodiment 3

[0042] Add 187.5g of paraformaldehyde, 100g of water, and 126g of melamine into a reactor with a stirrer and temperature control, adjust the reaction system to a pH value of 8.5-9.0 with 20% potassium hydroxide, and raise the temperature to 75°C , kept warm for 2 hours, and the refined methylolation degree was 5.8 methylolated melamine white solid; in the methylolated melamine white solid, 250 g of methanol was added, and the reaction temperature was controlled at 40° C.; the reaction system was regulated with 67% nitric acid To pH = 4.0, raise the temperature to 62°C and keep it warm for 7 hours. After testing, a clear liquid of methylolated melamine with 78% of the methylol groups blocked by methanol is obtained; then add 214g of diisopropanolamine and adjust the reaction system with phosphoric acid pH = 8.1, control the reaction temperature at 70°C, keep it warm for 6h; raise the temperature to 105°C, vacuumize and remove small molecules under the condition of -0.02~-0.1MPa ...

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Abstract

The invention relates to a polyol for foamed plastic and polyisocyanurate foamed plastic adopting the same. A preparation method of the polyol for foamed plastic comprises the following step of: undergoing an etherifying reaction on highly-hydroxymethylated melamine and a unitary alcohol, wherein the hydroxymethylation degree of the highly-hydroxymethylated melamine is not less than 5.5; the unitary alcohol is one or a mixture of more than two of methanol, ethanol, propanol and butanol in any ratio; and the hydroxyl value of the polyol for the polyisocyanurate foamed plastic is 160-650 mg KOH / g. As an improvement, the preparation method of the polyol further comprises the following steps of: mixing an etherification reaction product with an alcohol-amine compound containing a -NH radical for undergoing a dehydrating reaction, and vacuumizing to remove water generated by the reaction; and adding excessive oxyalkylene hydrocarbon for undergoing a ring opening reaction. When the polyol for foamed plastic is taken as a raw material for preparing the polyisocyanurate foamed plastic, the flame resistance of the polyisocyanurate foamed plastic can be effectively improved.

Description

technical field [0001] The present invention relates to a polyol for foamed plastics and polyisocyanurate foamed plastics using the polyol. Background technique [0002] Rigid polyurethane foam is widely used in refrigerators, cold storage and water heater insulation due to its excellent thermal insulation properties. In the field of building insulation, due to the poor combustion performance of rigid polyurethane foam, it has not been widely used. Generally, three methods can be used to improve the flame retardancy of rigid polyurethane foam: (1) adding a certain amount of flame retardant to the reaction raw materials; (2) using excessive isocyanate to react to form polyisocyanurate foam; (3) ) to combine the above two methods. [0003] When using the first method, the flame retardant can be additive or reactive. Additive flame retardants, such as halogenated phosphates, chlorinated paraffins, aluminum hydroxide, etc., tend to greatly reduce the physical and mechanical p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/26C08G18/50C08G101/00
Inventor 邢益辉黄东平付振华周国庆
Owner HONGBAOLI GRP CO LTD