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Heavy calcium carbonate special for silicone sealant and preparation method thereof

A heavy calcium carbonate, silicone sealant technology, applied in the direction of fibrous filler, dyed low molecular organic compound treatment, etc., can solve problems such as unsatisfactory effect, achieve excellent processing and mechanical properties, good aging resistance, active high effect

Inactive Publication Date: 2021-04-30
广西碳酸钙产业化工程院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some silicone sealants for construction have begun to try to use ground calcium carbonate and nano-calcium carbonate compound filling, hoping to meet the above market demand, but the effect is not satisfactory

Method used

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  • Heavy calcium carbonate special for silicone sealant and preparation method thereof
  • Heavy calcium carbonate special for silicone sealant and preparation method thereof
  • Heavy calcium carbonate special for silicone sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of special ground calcium carbonate for silicone sealant, comprising the following steps:

[0029] (1) The raw ore is selected and dry-ground to 680 orders, and the obtained heavy calcium carbonate powder is mixed with slurry, and the slurry is allocated to a mass concentration of 20%, and 0.05% dodecylbenzenesulfonic acid is added to the slurry, stirred Mixed solution 1 is obtained after uniformity;

[0030] (2) Add sodium hydroxide to the mixed solution 1 of step (1) to adjust the pH of the system to 11, and stir to obtain the mixed solution 2;

[0031] (3) Add 0.5% octamethylcyclotetrasiloxane to the mixed solution 2 in step (2), keep stirring and raise the temperature of the mixed solution to 80° C. to obtain the mixed solution 3;

[0032] (4) Add 0.1% tris(2-methoxyethoxy)vinylsilane dropwise to the mixed solution 3 in step (3) at a rate of 10 g / min, keep the temperature of 75-80° C. for 3 hours to obtain Mixture 4;

[0033] (5) The mixed so...

Embodiment 2

[0035] A preparation method of special ground calcium carbonate for silicone sealant, comprising the following steps:

[0036] (1) The raw ore is selected and dry-ground to 720 orders, and the obtained heavy calcium carbonate powder is mixed with slurry, and the slurry is allocated to a mass concentration of 25%, and 0.05% dodecylbenzenesulfonic acid is added to the slurry, stirred Mixed solution 1 is obtained after uniformity;

[0037] (2) Add sodium hydroxide to the mixed solution 1 of step (1) to adjust the pH of the system to 12, and stir to obtain the mixed solution 2;

[0038] (3) Add 0.7% octamethylcyclotetrasiloxane to the mixed solution 2 in step (2), keep stirring and raise the temperature of the mixed solution to 80° C. to obtain the mixed solution 3;

[0039] (4) Add 0.15% tris(2-methoxyethoxy)vinylsilane dropwise to the mixed liquid 3 in step (3) at a rate of 10g / min, keep the temperature of 75-80°C for 2.5h Obtain mixed solution 4;

[0040] (5) The mixed solut...

Embodiment 3

[0042] A preparation method of special ground calcium carbonate for silicone sealant, comprising the following steps:

[0043] (1) The raw ore is selected and dry-ground to 690 orders, and the obtained heavy calcium carbonate powder is mixed with slurry, and the slurry is allocated to a mass concentration of 25%, and 0.08% dodecylbenzenesulfonic acid is added to the slurry, stirred Mixed solution 1 is obtained after uniformity;

[0044] (2) Add sodium hydroxide to the mixed solution 1 of step (1) to adjust the pH of the system to 12, and stir to obtain the mixed solution 2;

[0045] (3) Add 0.8% octamethylcyclotetrasiloxane to the mixed solution 2 in step (2), keep stirring and raise the temperature of the mixed solution to 78° C. to obtain the mixed solution 3;

[0046] (4) Add 0.20% tris(2-methoxyethoxy)vinylsilane dropwise to the mixed solution 3 in step (3) at a rate of 10 g / min, keep the temperature at 80°C for 3 hours to obtain the mixed solution 4;

[0047] (5) The m...

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Abstract

The invention discloses a preparation method of special heavy calcium carbonate for a silicone sealant. The method comprises the following steps: (1) preparing slurry from heavy calcium carbonate powder obtained by dry grinding of raw ore, blending the slurry, adding dodecylbenzene sulfonic acid into the slurry, and uniformly stirring to obtain a mixed solution 1; (2) adding sodium hydroxide into the mixed solution 1 to adjust the pH of the system, and uniformly stirring to obtain a mixed solution 2; (3) adding octamethylcyclotetrasiloxane into the mixed solution 2, and continuously stirring and heating to obtain a mixed solution 3; (4) dropwise adding tri(2-methoxyethoxy)vinyl silane into the mixed solution 3, and reacting at constant temperature to obtain a mixed solution 4; and (5) carrying out filter pressing dehydration on the mixed solution 4, drying, crushing, grading and packaging to obtain the special heavy calcium carbonate for the silicone sealant. The modified heavy calcium carbonate product prepared by the method is good in dispersity, high in activity and strong in hydrophobicity, is applied to a silicone sealant, and can ensure excellent processing and mechanical properties of the sealant.

Description

technical field [0001] The invention belongs to the field of preparation of heavy calcium carbonate, and in particular relates to a preparation method of heavy calcium carbonate capable of imparting good performance to silicone sealants. Background technique [0002] Ground calcium carbonate powder is a powder product made of natural carbonate minerals such as calcite, marble, limestone, etc., which is mechanically crushed and ground to a certain fineness. It is a commonly used powdery inorganic filler with high whiteness, stability , non-toxic, cheap and easy to process, it is currently the most widely used and used inorganic non-metallic mineral powder, widely used in rubber, plastics, paper, coatings, paints, inks, cables, sealants and other industries. After the filler is mixed with the polymer, it can strengthen and whiten the effect, and improve the mechanical and physical properties of the material to a certain extent; but the surface of the unmodified ground calcium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08
CPCC09C1/021C09C3/08
Inventor 覃玲意童张法李奇洪贺路路汤勇钟玲萍陈小鹏黄华彬叶有贝进国谢云
Owner 广西碳酸钙产业化工程院有限公司