In situ Preparation and Property of Superfine High-dispersal Calcium Carbonate†

doi:10.7503/cjcu20170697

Abstract

Abstract:

High-dispersal hydrophobic CaCO₃ nanoparticles were obtained by the surface modification of oleic acid(OA). The size of CaCO₃ nanoparticles could be controlled within the range of 40—50 nm during the carbonation process of Ca(OH)₂ slurry by CO₂. The oleic acid grafted onto the surface of superfine calcium carbonate nanoparticles in situ surface modification, the dispersal state of CaCO₃ nanoparticles was well improved. And surface state of CaCO₃ nanoparticles was changed from hydrophilic to hydrophobic due to the contact angle of superfine CaCO₃ filler was 125.96°. Adding 1%(mass fraction) superfine CaCO₃ nanoparticles filler to ABS resin matrix, its whiteness increased from 62.47 to 87.96, which indicated that superfine CaCO₃ filler can be widely used in “white home appliance” ABS resin.

Key words: CaCO3 nanoparticles, Hydrophobic, High-dispersal, Whiteness

CLC Number:

TrendMD:

MA Xiaokun, SHENG Ye, ZHOU Bing, WANG Zichen. In situ Preparation and Property of Superfine High-dispersal Calcium Carbonate^†[J]. Chem. J. Chinese Universities, 2018, 39(3): 491.

Figures/Tables 6

Fig.1 TEM images of unmodified(A) and OA-modified(B) CaCO3 nanoparticles

Fig.2 Zeta potential of unmodified CaCO3 nanoparticles(A) and the particle size distributions of unmodified CaCO3 nanoparticles(a) and OA-modified CaCO3 nanoparticles(b)(B)

Scheme 1 Schematic illustration of the surface modification process of CaCO3 nanoparticles by OA

Fig.3 Contact angles of unmodified(A) and OA-modified(B) CaCO3 nanoparticles

Fig.4 SEM images of impact section of pure ABS polymer matrix(A), 1% unmodified CaCO3 nanoparticles/ABS composite(B), 1% OA-modified CaCO3 nanoparticles/ABS composite(C) and 2% OA-modified CaCO3 nanoparticles/ABS composite(D)

Table 1 Properties of ABS and different CaCO3/ABS composites

Sample	Amount of nanoparticles	Impact strength/ (kJ·m^-2)	Bending strength/MPa	Tensile Strength/MPa	Vicat softening temperature/℃	Whiteness	Hardness
ABS	0	21.96	82.78	48.58	95.7	62.47	107.9
Composite 1	0.2%Unmodified-CaCO₃	18.04	78.67	46.81	95.7	78.55	108.2
Composite 2	0.2%OA-modified-CaCO₃	20.88	80.69	47.12	95.8	79.53	108.2
Composite 3	0.5%Unmodified-CaCO₃	17.47	77.82	46.78	96.0	83.71	109.2
Composite 4	0.5%OA-modified-CaCO₃	18.96	77.28	46.13	96.1	85.47	109.4
Composite 5	1%OA-modified-CaCO₃	18.18	76.48	45.59	96.8	87.96	110.2
Composite 6	2%OA-modified-CaCO₃	17.26	77.53	45.85	97.4	88.54	110.5

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