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Preparation method of organosilicon foam stabilizer applied to single-component polyurethane foam sealing agent

A technology of silicone foam and polyurethane foam, applied in the field of foam stabilizers, can solve the problems of poor fluidity, poor dimensional stability and low foaming ratio of the foaming system, and achieve enhanced shrinkage resistance, improved fluidity, and uniform cells. Effect

Active Publication Date: 2014-07-09
苏州思德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it is not specially developed for polyurethane foam sealants, it is easy to cause quality problems in the production of polyurethane foam sealants, such as easy shrinkage of foam, poor dimensional stability, low expansion ratio, poor fluidity of foaming system, etc.

Method used

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  • Preparation method of organosilicon foam stabilizer applied to single-component polyurethane foam sealing agent
  • Preparation method of organosilicon foam stabilizer applied to single-component polyurethane foam sealing agent
  • Preparation method of organosilicon foam stabilizer applied to single-component polyurethane foam sealing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 45g of allyl alcohol, 50g of ethylene oxide, 4.5g of propylene oxide, and 0.5g of KOH into the reaction kettle, control the temperature at 90°C and the reaction pressure at 0.5MPa, and react for 4 hours. When the system When the pressure drops to less than 0.15MPa, the temperature is lowered to stop the reaction, and after neutralization, filtration and extraction treatment, an allyl-terminated copolyether containing ethylene oxide and propylene oxide groups is obtained;

[0029] (2) React 35g of the polyether prepared in step (1) with a small piece of metal sodium at a temperature of 90°C, pass through an excess of halogenated alkanes, and react for 4 hours. After the above reaction is completed, add distilled water to the system and stir. Lower the temperature to 80°C, adjust the pH value to 6.5, and let it stand until the oil-water two-phase layer is separated, remove the water phase, vacuumize the obtained oil phase, add a decolorant and filter to obtain a me...

Embodiment 2

[0033] (1) Add 170g of allyl alcohol, 10g of ethylene oxide, 19.8g of propylene oxide, and 0.2g of NaOH into the reaction kettle, and react for 6 hours under the conditions of controlling the temperature at 120°C and the reaction pressure at 0.4MPa. When the system When the pressure drops to less than 0.15MPa, the temperature is lowered to stop the reaction, and after neutralization, filtration and extraction treatment, an allyl-terminated copolyether containing ethylene oxide and propylene oxide groups is obtained;

[0034] (2) React 65g of the polyether prepared in step (1) with a small piece of metal sodium at a temperature of 115°C, pass through an excess of halogenated alkanes, and react for 6 hours. After the above reaction is completed, add distilled water to the system and stir. Lower the temperature to 80°C, adjust the pH value to 7.0, and let it stand until the oil-water two-phase layer is separated, remove the water phase, vacuumize the obtained oil phase, add a deco...

Embodiment 3

[0038] (1) Add 120g of allyl alcohol, 77g of ethylene oxide, 2g of propylene oxide, and 1.0g of NaOH into the reaction kettle, and react for 5 hours under the conditions of controlling the temperature at 130°C and the reaction pressure at 0.4MPa. When the system pressure When the temperature is lowered to less than 0.15MPa, the temperature is lowered to stop the reaction, and after neutralization, filtration and extraction treatment, an allyl-terminated copolyether containing ethylene oxide and propylene oxide groups is obtained;

[0039](2) React 55g of the polyether prepared in step (1) with a small piece of sodium metal at a temperature of 120°C, pass through an excess of halogenated alkanes, and react for 5 hours. After the above reaction is completed, add distilled water to the system and stir. Lower the temperature to 80°C, adjust the pH value to 7.0, and let it stand until the oil-water two-phase layer is separated, remove the water phase, vacuumize the obtained oil phas...

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Abstract

The invention discloses a preparation method of an organosilicon foam stabilizer applied to a single-component polyurethane foam sealing agent. The preparation method comprises the steps of (1) adding allyl alcohol, ethylene oxide and propylene oxide to a reaction kettle, and reacting under the action of a base catalyst at the temperature of 90-130 DEG C and pressure not more than 0.5MPa for 4-6h to obtain allyl-terminated copolymer ether; (2) reacting the polyether prepared in the step 1 with sodium at 85-120 DEG C, introducing excess haloalkane, and reacting for 4-6h to obtain methyl-terminated copolymer ether; (3) reacting octamethyl cyclotetrasiloxane, hexamethyl disiloxane and high-hydrogen-content silicone oil with hydrogen content of 1-2% in the presence of an acid ion exchanger to obtain low-hydrogen-content silicone oil with hydrogen content of 0.05-1.0%; (4) mixing the products obtained in the steps 1,2, and 3, adding a catalyst, and reacting under the condition of pressure being 0.5-2atm for 3-8h to obtain the organosilicon foam stabilizer. During foaming, the foam stabilizer has excellent dimensional stability and high foaming ratio and fluidity.

Description

technical field [0001] The invention relates to a preparation method of a silicone foam stabilizer applied to a one-component polyurethane foam caulking agent, and belongs to the technical field of foam stabilizers. Background technique [0002] One-component polyurethane foam sealant is a polyurethane foam filling and sealing material that is solidified by water vapor in the air. It has excellent properties such as heat insulation, sound insulation, bonding, waterproof, heat expansion and contraction resistance, and is widely used in building doors and windows. Joints, component expansion joints and filling and sealing of holes, etc. The main components of the foaming system of this type of caulk include isocyanate, such as diphenylmethane diisocyanate (MDI) or its mixture with toluene diisocyanate (TDI), polyether or polyester polyol or a mixture of both, and Additives such as foaming agent, plasticizer and surfactant. At present, the commonly used surfactant in the prod...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G65/338C08G65/337C08G65/28C08G77/12C08J9/00C08L75/04
Inventor 林斌王孝年
Owner 苏州思德新材料科技有限公司
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