改性纳米碳酸钙用于硅酮胶挤出性研究

doi:10.11962/1006-4990.2019-0267

Abstract

Abstract:

Nano-sized calcium carbonate was prepared by carbonization method.In the process of reaction,the initial reaction temperature was adjusted to synthesize nano-sized calcium carbonate with different crystal sizes.The phase,morphology and particle size of calcium carbonate were analyzed by transmission electron microscope（TEM） and laser particle size analyzer.The modified nano-sized calcium carbonate was applied to the preparation and extrudability of silicone sealant base material. The effects of particle size,dispersibility,rheology and surface modifier on extrudability of modified nano-sized calcium car-bonate were analyzed.The results indicated that the particle size was in the range of 50~90 nm,the yield value was in the range of 66.4~148.9 Pa and the viscosity was in the range of 0.5~0.75 mPa·s,the nano-sized calcium carbonate compounded and modified by sodium stearate and two kinds of low molecular weight fatty acid coating agents（LH-2 and LH-3） showed good extrudability for silicone sealant base material.

Key words: nano-sized calcium carbonate, particle size and dispersibility, modification, rheology, extrudability

CLC Number:

TQ132.32

Jing Ting. Study on extrudability of silicone sealant by using modified nano-sized calcium carbonate[J]. Inorganic Chemicals Industry, 2020, 52(4): 57-60.

实验编号	黏度/（mPa·s）	屈服值/Pa	挤出性/（g·min^-1）
1	0.34	40.3	36.21
2	0.50	66.4	34.18
3	0.64	105.2	29.30
4	0.75	148.9	25.57
5	0.81	185.2	23.41
6	0.94	203.3	18.24

碳酸钙类型	一次颗粒/nm	屈服值/ Pa	黏度/ （mPa·s）	细度/ μm	挤出性/ （g·min^-1）
纳米碳酸钙-25 ℃	30~50	276.8	1.15	35	17.3
纳米碳酸钙-30 ℃	50~90	129.7	0.68	15	28.2
普通碳酸钙	500	20.4	0.27	10	45.2

包覆剂	添加量/%	活化度/%	挤出性/（g·min^-1）
硬脂酸钠	3.2	98.5	23.19
硬脂酸钠+LH-1	2.8+0.4	98.7	22.83
硬脂酸钠+LH-2	2.8+0.4	99.0	26.37
硬脂酸钠+LH-3	2.8+0.4	99.2	28.75

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Study on extrudability of silicone sealant by using modified nano-sized calcium carbonate

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