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Preparation of nano calcium carbonate for siloxane end-capped polyurethane sealant

A polyurethane sealant, nano calcium carbonate technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, dyed silicone compounds, etc., can solve problems such as the discussion of sealant stability, achieve good economic and social benefits, The process is simple and feasible, and the effect of reducing viscosity

Active Publication Date: 2019-03-22
ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of the sealant was not discussed

Method used

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  • Preparation of nano calcium carbonate for siloxane end-capped polyurethane sealant
  • Preparation of nano calcium carbonate for siloxane end-capped polyurethane sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation of nano-calcium carbonate for silane-terminated polyurethane sealant, comprises the steps:

[0031] (1) Adjust the specific gravity of the refined milk of lime to 1.065, then introduce it into the bubbling carbonation reactor, adjust the temperature of the milk of lime to 31°C, and introduce CO 2 Concentration is 33% mixed gas, carbonation to pH = 7.0, get nano-calcium carbonate suspension;

[0032] (2) Heat the nano-calcium carbonate suspension to 75°C, add a surface treatment agent compounded by trimethylsilanol, dimethylformamide and sodium stearate, and the amount of the surface treatment agent added is 4.2% of the dry mass of calcium carbonate, of which trimethylsilanol, dimethylformamide and sodium stearate accounted for 40%, 5% and 55% respectively, and the surface modification was completed after stirring for 60 minutes , to obtain modified calcium carbonate suspension;

[0033] (3) The modified calcium carbonate suspension is dehydrated ...

Embodiment 2

[0035] A kind of preparation of nano-calcium carbonate for silane-terminated polyurethane sealant, comprises the steps:

[0036] (1) Adjust the specific gravity of the refined milk of lime to 1.070, then introduce it into the bubbling carbonation reactor, adjust the temperature of the milk of lime to 35°C, and introduce CO 2 Concentration is 33% mixed gas, carbonation to pH = 7.0, get nano-calcium carbonate suspension;

[0037] (2) Heat the nano-calcium carbonate suspension to 80°C, add a surface treatment agent compounded by trimethylsilanol, dimethylformamide and sodium stearate, and the amount of the surface treatment agent added is 4.0% of calcium carbonate on a dry basis, of which trimethylsilanol, dimethylformamide and sodium stearate accounted for 41%, 1% and 55% respectively, and the surface modification was completed after stirring for 60 minutes , to obtain modified calcium carbonate suspension;

[0038] (3) The modified calcium carbonate suspension is dehydrated b...

Embodiment 3

[0040] A kind of preparation of nano-calcium carbonate for silane-terminated polyurethane sealant, comprises the steps:

[0041] (1) Adjust the specific gravity of the refined milk of lime to 1.075, then introduce it into the bubbling carbonation reactor, adjust the temperature of the milk of lime to 33°C, and introduce CO 2 Concentration is 33% mixed gas, carbonation to pH = 7.0, get nano-calcium carbonate suspension;

[0042] (2) Heat the nano-calcium carbonate suspension to 70°C, add a surface treatment agent compounded by trimethylsilanol, dimethylformamide and sodium stearate, and the amount of the surface treatment agent added is 4.5% of calcium carbonate on a dry basis, of which trimethylsilanol, dimethylformamide and sodium stearate accounted for 47%, 3% and 50% respectively, and the surface modification was completed after stirring for 60 minutes , to obtain modified calcium carbonate suspension;

[0043] (3) The modified calcium carbonate suspension is dehydrated by ...

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Abstract

The invention discloses preparation of nano calcium carbonate for a siloxane end-capped polyurethane sealant, the proportion of refined lime milk is regulated to 1.060-1.080, a bubbling carbonation reaction kettle is then introduced, a CO2 mixed gas is introduced to implement the carbonation reaction, the reaction is stopped when the pH of a reaction liquid is equal to 7.0, a nano calcium carbonate suspension is obtained; the nano calcium carbonate suspension is heated to 75-85 DEG C, a surface treating agent compounded from hydroxytrimethylsilane, dimethylformamide and fatty acid salt is added, the addition quantity of the surface treating agent is 4.0-5.0% of the mass of a calcium carbonate dry basis in the suspension, the surface modifying is finished after stirring for 30-60 minutes, amodified calcium carbonate suspension is obtained; the modified calcium carbonate suspension is filter-pressed, dehydrated, dried and pulverized to obtain a nano calcium carbonate product. After thecalcium carbonate prepared through the method fills SPU (siloxane end-capped polyurethane), the problem of dispersity of calcium carbonate in the SPU sealant is solved, and the elongation at break andthe storage stability of the SPU sealant are also obviously improved.

Description

technical field [0001] The invention relates to the technical field of nano-calcium carbonate, in particular to the preparation of nano-calcium carbonate for silane-terminated polyurethane sealants. Background technique [0002] One-component moisture-curing silane end-capped polyurethane (SPU, siloxane end-capped polyurethane) sealant is a new type of elastic sealant. The network structure formed after curing has the dual characteristics of polyurethane chain and Si-O-Si bond. The combination of these two different chains and bonds in the structure makes the SPU sealant have many excellent properties: it has a good balance between mechanical properties, adhesion properties, aging resistance and other properties; the curing and crosslinking of the SPU sealant With the help of the alkoxy group in the silane, the hydrolysis and polycondensation reaction is completed under the action of humidity at room temperature, and no CO is released. 2 , so it will not foam under high tem...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/12C09C3/08C09J175/04C09J11/04
CPCC08K2003/265C08K2201/011C09C1/021C09C3/006C09C3/08C09C3/12C09J11/04C09J175/04C08K9/06C08K9/04C08K3/26
Inventor 蓝擎朱勇刘卢科廖俊杰
Owner ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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