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Process for processing organic-silicone modified polyurethane sealant

A processing technology, polyurethane technology, applied in the field of sealants, can solve problems such as poor elongation, poor pollution resistance, poor aging resistance, etc., to achieve stable and excellent adhesion, high physical mechanics, and excellent weather resistance sexual effect

Inactive Publication Date: 2013-05-29
XIAN HUIKE GEOLOGICAL TECH SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] polysulfide rubber, its disadvantages: its elongation is not good, generally less than 300%; due to the presence of disulfide bonds in polysulfide rubber, the aging resistance Not good, as a building sealant, deep cracks will appear for a long time, and its cold resistance is not good
[0005] Silicone sealant, its biggest disadvantage is poor pollution resistance, serious pollution at the joints of silicone sealant, affecting the appearance, and poor paintability, durability Disadvantages such as poor abrasiveness and poor tear strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A processing technique of silicone-modified polyurethane sealant, comprising the following steps:

[0031] The first step is to prepare A component, and this step includes the following steps:

[0032] First, the polyether polyol and isocyanate that have been dehydrated in vacuum are added to a four-necked flask with a thermometer, a condenser, a stirring device and a vent pipe;

[0033] Second, under the protection of high-purity nitrogen, slowly heat the material in the previous step to 60°C and keep the pressure at -0.06MP;

[0034] Third, while stirring at a constant speed, slowly drop silane into the reaction system, control the temperature at 70 °C, take samples every 30 minutes, and measure the content of NCO groups by titration. When it is detected that the NCO groups meet the design requirements, Take out the sample and keep it tightly closed.

[0035] The second step is to prepare component B, and this step includes the following steps:

[0036] First, mix ...

Embodiment 2

[0040] A processing technique of silicone-modified polyurethane sealant, comprising the following steps:

[0041] The first step is to prepare A component, and this step includes the following steps:

[0042] First, the polyether polyol and isocyanate that have been dehydrated in vacuum are added to a four-necked flask with a thermometer, a condenser, a stirring device and a vent pipe;

[0043] Second, under the protection of high-purity nitrogen, slowly heat the material in the previous step to 70°C and keep the pressure at -0.075MP;

[0044] Third, while stirring at a constant speed, slowly drop silane into the reaction system, control the temperature at 70 °C, take samples every 30 minutes, and measure the content of NCO groups by titration. When it is detected that the NCO groups meet the design requirements, Take out the sample and keep it tightly closed.

[0045] The second step to prepare B component This step includes the following steps:

[0046] First, mix talc, l...

Embodiment 3

[0050] A processing technique of silicone-modified polyurethane sealant, comprising the following steps:

[0051] The first step is to prepare A component, and this step includes the following steps:

[0052] First, the polyether polyol and isocyanate that have been dehydrated in vacuum are added to a four-necked flask with a thermometer, a condenser, a stirring device and a vent pipe;

[0053] Second, under the protection of high-purity nitrogen, slowly heat the material in the previous step to 65°C and keep the pressure at -0.07MP;

[0054] Third, while stirring at a constant speed, slowly drop silane into the reaction system, control the temperature at 70°C, take samples every 30 minutes, and measure the content of NCO groups by titration. When the NCO groups are detected to meet the design requirements, Take out the sample and keep it tightly closed.

[0055] The second step is to prepare component B, and this step includes the following steps:

[0056] First, mix talc,...

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Abstract

The invention relates to a process for processing an organic-silicone modified polyurethane sealant. The process comprises the following steps of: preparing a component A and preparing a component B. The steps of preparing the component A are as follows: (1) adding polyether polyol which is dehydrated in vacuum and isocyanate into a four-necked flask which is provided with a thermometer, a condenser, a stirring device and a vent tube; (2) heating the materials slowly; and (3) dropwise adding silicane into a reaction system slowly while stirring at a constant speed, measuring the content of NCO groups, sealing and storing if the content of the NCO groups meets the requirement. The steps of preparing the component B are as follows: (1) mixing talcum powder, light calcium carbonate, calcium oxide, a plasticizer, an antioxidant 1010, an UV (ultraviolet) absorber UV-327, a carbide-imine hydrolytic stabilizer, MOCA, polyether polyol and a pigment, stirring fully to disperse and grinding; and (2) pouring the dispersed component B into another reactor, dehydrating in vacuum under the condition of stirring, and sealing and storing in a plastic or iron container to obtain the component B. The organic-silicone modified polyurethane sealant has the advantages of high elasticity, low temperature flexibility, water resistance and ageing resistance.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a processing technology of silicone-modified polyurethane sealants. Background technique [0002] Sealants are materials used to fill voids (voids, seams). When used, the sealant is a fluid or extruded and unshaped material, which can be embedded and sealed, and can achieve stable bonding with the substrate by drying, temperature changes, solvent volatilization and chemical crosslinking. And gradually shaped into a plastic solid or elastic sealing material. The basic functions of sealants are: sealing the joints of buildings, preventing wind and snow, sound insulation, heat preservation, shock absorption, and improving living conditions; sealing the joints of storage tanks, storage pools, pipes, and ditches to prevent material loss, pressure leakage and harmful substances prevent the accumulation of water seepage, freeze-thaw and alternating wet and dry in the join...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/83C08G18/48C09K3/10
Inventor 张晓丽
Owner XIAN HUIKE GEOLOGICAL TECH SERVICES
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