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A kind of preparation method of nano calcium carbonate special for polyurethane sealant

A technology of polyurethane sealant and nano-calcium carbonate, which is applied in the field of nano-materials, can solve problems such as difficult mechanical strength, poor compatibility, and weak binding force, and achieve the effects of increasing mechanical properties, improving mechanical strength, and good mechanical properties

Inactive Publication Date: 2017-12-05
GUANGXI PINGNAN COUNTY HENGXIANG CALCIUM CARBONATE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment agent used in this product is an inorganic condensation acid and a silane-based coupling agent, which have poor compatibility with the polyurethane system, weak binding force, and difficult to effectively improve the mechanical strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of special nanometer calcium carbonate of polyurethane sealant of the present invention comprises the steps:

[0028] A, to 10kgCa(OH) 2 Add the crystal form control agent into the solution, stir and mix evenly, pass CO 2 Gas is subjected to bubbling carbonization reaction until the pH of the solution is 7 to obtain cooked pulp; the crystal form control agent is a mixture of sucrose and citric acid, and the addition amount is 0.01kg;

[0029] B. After the cooked pulp is sieved, the temperature is raised to 60°C, and a mixture of saturated fatty acid sodium and bismuth carboxylate salt is added as a surfactant under stirring, and the pH value is adjusted to 7, and the stirring is continued for 45 minutes;

[0030] C. The cooked slurry stirred in step B is subjected to pressure filtration to obtain a filter cake, which is dried, pulverized and further dried to obtain final product.

[0031] In the described step A, Ca(OH) 2 The preparation method...

Embodiment 2

[0040] The preparation method of special nanometer calcium carbonate of polyurethane sealant of the present invention comprises the steps:

[0041] A, to 10kgCa(OH) 2 Add the crystal form control agent into the solution, stir and mix evenly, pass CO 2 The gas is subjected to bubbling carbonization reaction until the pH of the solution is 7.3 to obtain cooked pulp; the crystal form control agent is a mixture of sodium citrate and EDTA, and the addition amount is 0.05kg;

[0042] B. After the cooked pulp is sieved, the temperature is raised to 65°C, and a mixture of saturated fatty acid sodium and bismuth carboxylate salt is added as a surfactant under stirring, and the pH value is adjusted to 7.5, and the stirring is continued for 50 minutes;

[0043] C. The cooked slurry stirred in step B is subjected to pressure filtration to obtain a filter cake, which is dried, pulverized and further dried to obtain final product.

[0044] In the described step A, Ca(OH) 2 The preparatio...

Embodiment 3

[0053] The preparation method of special nanometer calcium carbonate of polyurethane sealant of the present invention comprises the steps:

[0054] A, to 10kgCa(OH) 2 Add the crystal form control agent into the solution, stir and mix evenly, pass CO 2 The gas is subjected to bubbling carbonization reaction until the pH of the solution is 7.5 to obtain cooked pulp; the crystal form control agent is a mixture of sucrose and aluminum sulfate, and the addition amount is Ca(OH) 2 0.1kg of mass;

[0055] B. After the cooked pulp is sieved, the temperature is raised to 70°C, and a mixture of saturated fatty acid sodium and bismuth carboxylate salt is added as a surfactant under stirring, and the pH value is adjusted to 8, and the stirring is continued for 55 minutes;

[0056] C. The cooked slurry stirred in step B is subjected to pressure filtration to obtain a filter cake, which is dried, pulverized and further dried to obtain final product.

[0057] In the described step A, Ca(O...

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Abstract

The invention discloses a preparation method of special nano calcium carbonate for a polyurethane sealant. The method comprises steps as follows: A, a crystal form control agent is added to a Ca(OH)2 solution, the mixture is evenly mixed, CO2 is introduced for a bubbling carbonation reaction until the pH of the solution is 7-8, and boiled pulp is obtained; B, the boiled pulp is heated to 60-85 DEG C after being sieved, a mixture of saturated fatty acid sodium and bismuth carboxylate is added to be used as a surfactant in the stirring state, the pH value is adjusted to range from 7 to 9, and the mixture is continuously stirred for 45-60 min; C, the stirred boiled pulp in the step B is subjected to filter pressing, a filter cake is obtained, dried, crushed and further dried, and the special nano calcium carbonate is obtained. The prepared nano calcium carbonate has the higher binding force with a polyurethane system, the mechanical property of the polyurethane sealant can be significantly improved, and the tensile strength, the elongation at break and the tear strength of the polyurethane sealant can be improved after the special nano calcium carbonate is applied to the polyurethane sealant.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing nano calcium carbonate special for polyurethane sealants. Background technique [0002] Nano calcium carbonate (NaHO-CaCO 3 ) is a new type of functional nano-scale filler with excellent performance. It can not only increase the filling capacity, reduce the cost, but also improve the surface color of the product and improve the comprehensive mechanical properties of the product. At present, in developed countries, nano-calcium carbonate has been widely used in medium and high-grade rubber, plastic products, sealants, coatings, inks, etc. In China, the largest amount of nano-calcium carbonate is silicone sealant, followed by polyurethane sealant. The performance of polyurethane sealant is better than that of silicone sealant, but it is difficult to prepare. The amount of foreign polyurethane sealant is similar to that of silicone sealant. The main re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y40/00C09J175/08C09J11/04
CPCC01F11/181C01F11/183C01P2006/12C08K3/26C08K2003/265C08K2201/011C09J11/04C09J175/08
Inventor 杨光贵
Owner GUANGXI PINGNAN COUNTY HENGXIANG CALCIUM CARBONATE CO LTD
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