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Preparation method of special nano calcium carbonate for polyurethane sealant

A polyurethane sealant and nano calcium carbonate technology, applied in the field of nanomaterials, can solve the problems of weak binding force, difficult to effectively improve mechanical strength, poor compatibility, etc., and achieve improved mechanical strength, good storage stability, and good mechanical properties. Effect

Inactive Publication Date: 2017-01-04
连州市万仕达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to aim at the preparation of special nano-calcium carbonate for polyurethane glue in the prior art, when the treating agent is inorganic condensation acid and silane-based coupling agent, the compatibility with polyurethane system is poor, the binding force is weak, and the mechanical strength is difficult to effectively obtain To improve the technical problem, provide a preparation method of nano-calcium carbonate that has a good combination with the polyurethane system and can significantly improve the mechanical properties of the polyurethane sealant. The temperature, concentration, and crystal form control agent are controlled by carbonization, and the surface treatment adopts Fatty acid amine and carboxylate bismuth salt are jointly treated, and an appropriate amount of acid is added, and the nano-calcium carbonate product is obtained through pressure filtration, drying, and crushing, and the specific surface area of ​​the product is controlled to be 20-40m 2 / g, pH value 7-8.5, applied to polyurethane sealant can improve the tensile strength, elongation at break, tear strength of polyurethane sealant

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 fatty acid amine and bismuth carboxylate salt is added as a surfactant under stirring, and the pH value is adjusted to 7, and 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 of solution co...

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 the mixture of fatty acid amine 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 preparation method ...

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 fatty acid amine and bismuth carboxylate salt is added as a surfactant under stirring, and the pH value is adjusted to 8, and 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(OH) 2 The prepa...

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Abstract

The invention discloses a preparation method of special nano calcium carbonate for polyurethane sealant. The preparation method includes the following steps that A, a crystal form control agent is added into a Ca(OH)2 solution, the mixture is stirred and mixed evenly, CO2 gas is injected for a bubbling carbonation reaction until the pH value of the solution is 7-8, and then boiled liquid is obtained; B, the boiled liquid is sieved and heated to 60 DEG C-85 DEG C, a mixture of saturated fatty acid and carboxylic acid bismuth salt is added under a stirring state to serve as a surface active agent, the pH value is regulated to be 7-9, and stirring is continued for 45-60 minutes; C, the stirred boiled liquid in step B is subjected to filter pressing, so that a filter cake is obtained, the filter cake is dried, smashed and further dried, and then the special nano calcium carbonate is obtained. Bonding force between nano calcium carbonate and a polyurethane system is good, the mechanical property of the polyurethane sealant can be obviously improved, and when the nano calcium carbonate is applied to the polyurethane sealant, the tensile strength, elongation at break and tearing strength of the polyurethane sealant can be improved.

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 (Na-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 reas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00B82Y30/00C09J175/04C09J11/04
CPCC01F11/185C01F11/181C01F11/182C01F11/183C01P2006/12C08K3/26C08K9/10C08K2003/265C08K2201/011C09J11/04C09J175/04
Inventor 黄立贤杨晓华梁用全
Owner 连州市万仕达新材料有限公司
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