新型有机改性剂对重质碳酸钙的表面改性效果及机理

doi:10.19964/j.issn.1006-4990.2021-0517

Abstract

Abstract:

New modifiers and traditional modifiers were used to perform dry surface organic modification on two ground calcium carbonates，and the effect of modifier types and modifier dosages on the oil absorption，activation index，oil phase dispersion stability and water contact angle was explored.Then the optimized dosage of modification was determined，and the modification mechanism of ground calcium carbonate was explored by fourier transform infrared spectrometer（FT-IR） and thermogravimetric analysis（TG） characterization.The results showed that JST-9001（polyoxyethylene ether type composite modifier），JST-9003（polyoxyethylene ether type composite modifier），stearic acid and aluminate F-2 had better modification effects，especially the two new modifiers JST-9001 and JST-9003 could obtain more excellent effects of surface modification at low modifier dosage（0.5%）.And under the optimized dosage，the hydrophilic groups in the molecules of JST-9001 and JST-9003 modifiers were bonded with the —OH on the surface of ground calcium carbonate，coating the surface of ground calcium carbonate particles with modifiers molecular layer.

Key words: ground calcium carbonate, surface modification, organic modification, modification mechanism

CLC Number:

TQ132.32

LIANG Chao,LI Chunquan,SUN Zhiming,ZHENG Shuilin. Surface modification effect and mechanism of new organic modifiers on ground calcium carbonate[J]. Inorganic Chemicals Industry, 2022, 54(7): 70-77.

Figures/Tables 14

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重钙原矿样品	改性剂种类	用量（质量分数）/%	吸油值/ （mL·g^-1）	吸油值降低率（与原样相比）/%
C525	—	—	0.26	0.00
	JST-9001	1.0	0.12	53.85
	JST-9002	1.0	0.18	30.77
	JST-9003	1.0	0.14	46.15
	JST-9004	1.0	0.20	23.08
	羟基硅油	1.0	0.15	42.31
	氨基硅油585C	1.0	0.19	26.92
	硬脂酸	1.0	0.12	53.85
	铝酸酯F-2	1.0	0.13	50.00

重钙原矿样品	改性剂种类	用量（质量分数）/%	吸油值/ （mL·g^-1）	吸油值降低率（与原样相比）/%
C1000	—	—	0.23	0.00
	JST-9001	1.0	0.14	39.13
	JST-9002	1.0	0.16	30.43
	JST-9003	1.0	0.14	39.13
	JST-9004	1.0	0.16	30.43
	羟基硅油	1.0	0.20	13.04
	氨基硅油585C	1.0	0.20	13.04
	硬脂酸	1.0	0.16	30.43
	铝酸酯F-2	1.0	0.15	34.78

重钙原矿样品	改性剂种类	用量（质量分数）/%	活化指数/%
C525	—	—	1.80
	JST-9001	1.0	96.72
	JST-9002	1.0	3.97
	JST-9003	1.0	97.86
	JST-9004	1.0	19.67
	羟基硅油	1.0	2.56
	氨基硅油585C	1.0	4.57
	硬脂酸	1.0	95.72
	铝酸酯F-2	1.0	73.80

重钙原矿样品	改性剂种类	用量（质量分数）/%	活化指数/%
C1000	—	—	1.58
	JST-9001	1.0	65.69
	JST-9002	1.0	7.94
	JST-9003	1.0	81.06
	JST-9004	1.0	5.18
	羟基硅油	1.0	4.98
	氨基硅油585C	1.0	2.87
	硬脂酸	1.0	94.96
	铝酸酯F-2	1.0	100.00

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Surface modification effect and mechanism of new organic modifiers on ground calcium carbonate

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