Organic-silicon-modified polyurethane sealant and processing technology thereof

Abstract

The invention relates to organic-silicon-modified polyurethane sealant and processing technology thereof. The organic-silicon-modified polyurethane sealant is prepared by mixing the following components: polyether glycol, hydroxyl-terminated polymethyl siloxane with 6 to 18 degrees of polymerization, isocyanate, a catalyst, namely benzoyl chloride, an active hydrogen compound, a catalyst, namely dibutyltin dilaurate and filler. The process comprises the following steps of: 1, preparing a component A, wherein the step is divided into the following steps of: firstly, adding the polyether glycol and the isocyanate into a flask provided with a thermometer, a condenser, a stirring device and a vent pipe; secondly, heating the materials slowly; and thirdly, slowly adding silane into a reaction system dropwise, measuring the NCO group content by a titration method and storing tightly; and 2, preparing a component B, wherein the step is divided into the following steps of: mixing the materials, stirring and dispersing the materials, and grinding the materials by using a grinding machine for later use; and pouring the dispersed component B into another reactor, stirring the component to dehydrate, and storing tightly to obtain the component B. The organic-silicon-modified polyurethane sealant has the advantages of high elasticity, low-temperature flexibility, wear resistance, temperature resistance, water resistance and aging resistance.

Description

technical field

[0001] The invention belongs to the technical field of sealants, and in particular relates to an organosilicon-modified polyurethane sealant and a processing technology thereof. 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 in the joints, freeze-thaw and alternating w...

Examples

Embodiment 1

[0033] A silicone-modified polyurethane sealant, comprising the following components:

[0034] Component A includes: polyether polyol, hydroxyl-terminated polymethylsiloxane with a degree of polymerization of 18, isocyanate, and catalyst benzoyl chloride, the weight ratio of which is 10:1:1.

[0035] Component B: made by mixing active hydrogen compound, catalyst dibutyltin dilaurate and filler. The active hydrogen compound is a mixture of diamino-3,3'-dichlorodiphenylmethane and polyether polyol.

[0036] The weight ratio of the active hydrogen compound to the filler is 1:3, and the filler is talcum powder.

Embodiment 2

[0038] A processing technology of silicone-modified polyurethane sealant, comprising the steps of:

[0039] The first step is to prepare component A. This step includes the following steps:

[0040] The first, the polyether polyol and the isocyanate of vacuum dehydration are added in the four-necked flask that has thermometer, condenser, stirring device and ventilation pipe;

[0041] 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;

[0042] 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, until the NCO groups are detected to meet the design requirements, Take out the sample and keep it airtight.

[0043] The second step is to prepare the B component. This step includes the following steps:

[0044] First, talcum powder, light calc...

Embodiment 3

[0048] A silicone-modified polyurethane sealant, comprising the following components:

[0049] Component A includes: polyether polyol, hydroxyl-terminated polymethylsiloxane with a polymerization degree of 6, isocyanate, and catalyst benzoyl chloride, with a weight ratio of 10:3:2.

[0050] Component B: made by mixing active hydrogen compound, catalyst dibutyltin dilaurate and filler. The active hydrogen compound is a mixture of diamino-3,3'-dichlorodiphenylmethane and polyether polyol.

[0051] The weight ratio of the active hydrogen compound to the filler is 1:9, and the filler is light calcium carbonate.

technical field

[0001] The invention belongs to the technical field of sealants, and in particular relates to an organosilicon-modified polyurethane sealant and a processing technology thereof. 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 in the joints, freeze-thaw and alternating w...

Examples

Embodiment 1

[0033] A silicone-modified polyurethane sealant, comprising the following components:

[0034] Component A includes: polyether polyol, hydroxyl-terminated polymethylsiloxane with a degree of polymerization of 18, isocyanate, and catalyst benzoyl chloride, the weight ratio of which is 10:1:1.

[0035] Component B: made by mixing active hydrogen compound, catalyst dibutyltin dilaurate and filler. The active hydrogen compound is a mixture of diamino-3,3'-dichlorodiphenylmethane and polyether polyol.

[0036] The weight ratio of the active hydrogen compound to the filler is 1:3, and the filler is talcum powder.

Embodiment 2

[0038] A processing technology of silicone-modified polyurethane sealant, comprising the steps of:

[0039] The first step is to prepare component A. This step includes the following steps:

[0040] The first, the polyether polyol and the isocyanate of vacuum dehydration are added in the four-necked flask that has thermometer, condenser, stirring device and ventilation pipe;

[0041] 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;

[0042] 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, until the NCO groups are detected to meet the design requirements, Take out the sample and keep it airtight.

[0043] The second step is to prepare the B component. This step includes the following steps:

[0044] First, talcum powder, light calc...

Embodiment 3

[0048] A silicone-modified polyurethane sealant, comprising the following components:

[0049] Component A includes: polyether polyol, hydroxyl-terminated polymethylsiloxane with a polymerization degree of 6, isocyanate, and catalyst benzoyl chloride, with a weight ratio of 10:3:2.

[0050] Component B: made by mixing active hydrogen compound, catalyst dibutyltin dilaurate and filler. The active hydrogen compound is a mixture of diamino-3,3'-dichlorodiphenylmethane and polyether polyol.

[0051] The weight ratio of the active hydrogen compound to the filler is 1:9, and the filler is light calcium carbonate.