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    Silica pigment and preparation thereof
    2.
    发明授权
    Silica pigment and preparation thereof 失效
    二氧化硅颜料及其制备方法

    公开(公告)号：US2865779A

    公开(公告)日：1958-12-23

    申请号：US51791955

    申请日：1955-06-24

    Applicant: COLUMBIA SOUTHERN CHEM CORP

    Inventor： ALLEN EDWARD M

    IPC: C09C1/00

    CPC classification number: B82Y30/00 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/80 ,  C01P2006/12 ,  C01P2006/22 ,  C09C1/0081

    Abstract: Siliceous pigments comprise finely divided hydrated silica intimately mixed with a finely-divided alkaline earth metal sulphite. The pigments may be prepared by mixing a solution of a soluble silicate such as sodium or potassium silicate, a solution of a soluble compound of an alkaline earth metal, such as calcium hydroxide or chloride, and a solution of sulphur dioxide or an acid salt of sulphurous acid such as calcium bisulphite. The solutions may be mixed in any order and at any temperature from room temperature to boiling-point or even higher if high pressures are used. A centrifugal pump or a T-junction may be used for mixing. Preferably vigorous agitation is employed and steam may be blown into the reaction mixture. When calcium silicate or calcium carbonate is added to the reaction mixture to neutralize it, any excess may remain in the final pigment. Variation of reaction temperature, mixing rate and solution concentration provides some control over the ultimate particle size. A number of examples are given of three procedures: (A) reacting a silicate with an alkaline earth metal compound, adding an acid sulphite solution then neutralizing to precipitate the mixture of silica and alkaline earth sulphite; (B) reacting an alkali silicate with an acid sulphite solution to precipitate silica, then adding an alkaline earth metal compound at a pH such that the alkaline earth sulphite is precipitated; and (C) forming a slurry of alkaline earth metal compound with an acid sulphite solution and adding an alkali silicate at such a pH that silica and alkaline earth sulphite are precipitated.ALSO:Siliceous pigments comprising finely-divided hydrated silica intimately mixed with a finely-divided alkaline earth metal sulphite, prepared by mixing a solution of a soluble silicate such as sodium or potassium silicate, a solution of a soluble compound of an alkaline earth metal, such as calcium hydroxide or chloride, or barium hydroxide or chloride, and a solution of sulphur dioxide or an acid salt of sulphurous acid such as calcium bisulphite, may be dispersed in natural rubber or synthetic rubber such as butadiene-styrene copolymers (GR-S), butadiene-acrylonitrile, neoprene, isobutylene polymers and copolymers of isobutylene with isoprene, polymers of butadiene, isoprene, piperylene, 2 : 3-dimethyl butadiene, or 2-chlorobutadiene alone or with other ethylenic substances such as acrylonitrile, isobutylene, vinyl chloride, vinyl acetate, styrene, methyl methacrylate, methyl alphachloroacrylate and methyl acrylate. Examples are of compositions containing GR-S rubber, vulcanizing agents and accelerators, and the pigment of the invention, which are compared with similar compositions containing calcium silicate.

    Method of preparing a siliceous pigment
    9.
    发明授权
    Method of preparing a siliceous pigment 失效
    硅质颜料的制备方法

    公开(公告)号：US2865777A

    公开(公告)日：1958-12-23

    申请号：US52037355

    申请日：1955-07-06

    Applicant: COLUMBIA SOUTHERN CHEM CORP

    Inventor： ALLEN EDWARD M ,  CHISHOLM RAYMOND S

    IPC: C08K3/34 ,  C09C1/00

    CPC classification number: C08K3/34 ,  B82Y30/00 ,  C01P2004/61 ,  C01P2004/64 ,  C01P2006/12 ,  C09C1/0081 ,  C08L21/00

    Abstract: Siliceous pigments comprise finely divided hydrated silica intimately mixed with a finely-divided alkaline earth metal sulphite. The pigments may be prepared by mixing a solution of a soluble silicate such as sodium or potassium silicate, a solution of a soluble compound of an alkaline earth metal, such as calcium hydroxide or chloride, and a solution of sulphur dioxide or an acid salt of sulphurous acid such as calcium bisulphite. The solutions may be mixed in any order and at any temperature from room temperature to boiling-point or even higher if high pressures are used. A centrifugal pump or a T-junction may be used for mixing. Preferably vigorous agitation is employed and steam may be blown into the reaction mixture. When calcium silicate or calcium carbonate is added to the reaction mixture to neutralize it, any excess may remain in the final pigment. Variation of reaction temperature, mixing rate and solution concentration provides some control over the ultimate particle size. A number of examples are given of three procedures: (A) reacting a silicate with an alkaline earth metal compound, adding an acid sulphite solution then neutralizing to precipitate the mixture of silica and alkaline earth sulphite; (B) reacting an alkali silicate with an acid sulphite solution to precipitate silica, then adding an alkaline earth metal compound at a pH such that the alkaline earth sulphite is precipitated; and (C) forming a slurry of alkaline earth metal compound with an acid sulphite solution and adding an alkali silicate at such a pH that silica and alkaline earth sulphite are precipitated.ALSO:Siliceous pigments comprising finely-divided hydrated silica intimately mixed with a finely-divided alkaline earth metal sulphite, prepared by mixing a solution of a soluble silicate such as sodium or potassium silicate, a solution of a soluble compound of an alkaline earth metal, such as calcium hydroxide or chloride, or barium hydroxide or chloride, and a solution of sulphur dioxide or an acid salt of sulphurous acid such as calcium bisulphite, may be dispersed in natural rubber or synthetic rubber such as butadiene-styrene copolymers (GR-S), butadiene-acrylonitrile, neoprene, isobutylene polymers and copolymers of isobutylene with isoprene, polymers of butadiene, isoprene, piperylene, 2 : 3-dimethyl butadiene, or 2-chlorobutadiene alone or with other ethylenic substances such as acrylonitrile, isobutylene, vinyl chloride, vinyl acetate, styrene, methyl methacrylate, methyl alphachloroacrylate and methyl acrylate. Examples are of compositions containing GR-S rubber, vulcanizing agents and accelerators, and the pigment of the invention, which are compared with similar compositions containing calcium silicate.

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