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Surface modification method of special nano calcium carbonate for silicone sealants

A nano-calcium carbonate and surface modification technology, which is applied in the direction of fibrous fillers, dyed low-molecular organic compound treatment, adhesive additives, etc. Poor rubber extrudability, complex preparation process and other problems, to achieve the effect of small investment, good dispersion and simple process

Active Publication Date: 2015-04-01
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method involves complex preparation process, high processing cost, and poor extrudability of filled silicone rubber
[0008] In summary, the nano-calcium carbonate prepared by the existing method is difficult to meet the thixotropy and extrudability requirements of filling medium and high-grade silicone sealants

Method used

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  • Surface modification method of special nano calcium carbonate for silicone sealants
  • Surface modification method of special nano calcium carbonate for silicone sealants
  • Surface modification method of special nano calcium carbonate for silicone sealants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) The specific surface area is 26.9m 2 / g of calcium carbonate slurry was heated to 85°C and kept at a constant temperature.

[0035] (2) Preparation of surface treatment agent: add 1.0m 3 After heating up to 90°C and maintaining a constant temperature, add 1.0% (calcium carbonate dry basis mass) sulfated sodium oleate, stir for 15 minutes, then add 2.5% (calcium carbonate dry basis mass) stearic acid and palmitate A mixture of acids (stearic acid: palmitic acid = 8:2) was emulsified and stirred for 40 min.

[0036] (3) Add the surface treatment agent prepared in step (2) to the slurry obtained in step (1), and stir for 60 minutes to complete the surface modification.

[0037] (4) The calcium carbonate slurry obtained in step (3) is press-filtered and dehydrated, and a chain-belt drier is adopted at a drying temperature of 100 to 150° C., pulverized, classified and packaged to obtain the special nano-calcium carbonate product for silicone sealant of the present inve...

Embodiment 2

[0039] (1) The specific surface area is 23.3m 2 / g, the calcium carbonate slurry that concentration is 13.0% is heated to 85 ℃ and keeps constant temperature.

[0040] (2) Preparation of surface treatment agent: add 1.0m 3 After heating up to 90°C, keep the constant temperature, add 0.8% (calcium carbonate dry basis mass) sulfated sodium oleate, stir for 15min, then add 2.0% (calcium carbonate dry basis mass) stearic acid and palm A mixture of acids (stearic acid:palmitic acid=8:2) was emulsified and stirred for 40min.

[0041] (3) Add the surface treatment agent prepared in step (2) to the slurry obtained in step (1), and stir for 60 minutes to complete the surface modification.

[0042] (4) The calcium carbonate slurry obtained in step (3) is press-filtered and dehydrated, and a chain-belt drier is adopted at a drying temperature of 100 to 150° C., pulverized, classified and packaged to obtain the special nano-calcium carbonate product for silicone sealant of the present i...

Embodiment 3

[0044] (1) The specific surface area is 23.3m 2 / g, the calcium carbonate slurry that concentration is 13.0% is heated to 85 ℃ and keeps constant temperature.

[0045] (2) Preparation of surface treatment agent: add 1.0m 3After heating up to 90°C and maintaining a constant temperature, add 1.5% (calculated on a dry basis of calcium carbonate) sulfated sodium oleate, stir for 15 minutes, and then add 1.3% (calculated on a dry basis of calcium carbonate) stearic acid and palmitate A mixture of acids (stearic acid:palmitic acid=8:2) was emulsified and stirred for 40min.

[0046] (3) Add the surface treatment agent prepared in step (2) to the slurry obtained in step (1), and stir for 60 minutes to complete the surface modification.

[0047] (4) The calcium carbonate slurry obtained in step (3) is press-filtered and dehydrated, and a chain-belt drier is adopted at a drying temperature of 100 to 150° C., pulverized, classified and packaged to obtain the special nano-calcium carbon...

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Abstract

The invention discloses a surface modification method of special nano calcium carbonate for silicone sealants, which comprises the following steps: adding 0.8-1.5m<3> of tap water into a dosage tank, heating to 70-95 DEG C, keeping the temperature constant, adding sulfated sodium oleate, stirring for 10-20 minutes, and adding C12-C32 fatty acids for emulsification to obtain a surface treating agent; and heating a calcium carbonate slurry, adding the prepared surface treating agent which accounts for 2.5-4.5 wt% of the calcium carbonate on dry basis, stirring for 60-120 minutes to complete surface modification, dehydrating, drying at 100-150 DEG C, pulverizing, and packaging to obtain the product. The product can satisfy the requirements of mechanical properties and bonding properties for the filling silicone sealants, and has the advantages of favorable thixotropy, favorable extrudability, favorable dispersity and low aggregation tendency. The method has the advantages of simple technique and small investment, is suitable for industrial production, and has favorable economic benefits.

Description

field of invention [0001] The invention relates to a preparation of active nano-calcium carbonate, in particular to a method for surface modification of nano-calcium carbonate specially used for silicone glue. Background technique [0002] Nano-calcium carbonate is widely used in silicone sealant filling, and it has many defects as a functional filler. [0003] First of all, due to the extremely small particle size and large surface energy of nano-calcium carbonate, hard agglomeration is very easy to occur during the drying process and application process. Such hard agglomerated particles cannot be dispersed and depolymerized during the kneading process of the silicone sealant, resulting in uneven dispersion in the calcium carbonate, which will not only affect the appearance of the silicone sealant product, but also easily cause stress concentration. At present, the problem of reunion is mainly solved by surface treatment. When the nano-calcium carbonate surface coating tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09J11/04
Inventor 谌业文朱勇颜干才林进超
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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