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    SILICA SOL
    2.
    发明授权
    SILICA SOL 有权

    公开(公告)号：EP3036192B1

    公开(公告)日：2018-10-03

    申请号：EP14752874.9

    申请日：2014-08-20

    申请人： Akzo Nobel Chemicals International B.V.

    发明人： SANNE, Erik ,  HANSSON, Freddie

    IPC分类号： C01B33/141 ,  C01B33/145 ,  D21H17/37 ,  D21H17/68 ,  D21H21/10

    CPC分类号： C01B33/143 ,  C01B33/14 ,  C01B33/141 ,  C01B33/142 ,  C01B33/145 ,  D21H17/375 ,  D21H17/68 ,  D21H19/40 ,  D21H21/10

    摘要： The present invention relates to a silica sol having a pH above about 10, molar ratio of SiO2:M2O, in which M is alkali metal, of from about 6:1 to about 16:1, concentration of soluble silica above about 3000 mg SiO2/l, and S-value of from about 18 to about 40%. The invention further relates to a process for producing a silica sol which comprises acidifying an aqueous alkali metal silicate solution to a pH of from 1 to 4 to form an acid sol, alkalizing the acid sol by addition of aqueous alkali metal silicate solution to obtain an intermediate sol and interrupt the addition of aqueous alkali metal silicate solution when the intermediate sol has reached a pH of from about 5 to about 8, stirring the intermediate sol for a time period of from about 10 to about 6000 seconds without addition of aqueous alkali metal silicate solution, alkalizing the intermediate sol by addition of aqueous alkali metal silicate solution to obtain a silica sol having a pH above about 10 and molar ratio of SiO2:M2O, in which M is alkali metal, of from about 6:1 to about 16:1, and optionally adding an aluminum compound to the acid sol, intermediate sol or silica sol. The invention further relates to a silica sol obtainable by the process of the invention. The invention further relates to the use of the silica sol as a flocculating agent, in water purification and in producing paper and board. The invention further relates to a process for producing paper and board which comprises: (i) providing an aqueous suspension comprising cellulosic fibers; (ii) adding to the suspension one or more drainage and retention aids comprising the silica sol; and (iii) dewatering the obtained suspension to provide a sheet or web of paper or board.

    A METHOD OF INCREASING THE FILLER CONTENT IN PAPER OR PAPERBOARD
    10.
    发明公开
    A METHOD OF INCREASING THE FILLER CONTENT IN PAPER OR PAPERBOARD 审中-公开
    罂粟草莓

    公开(公告)号：EP3177769A1

    公开(公告)日：2017-06-14

    申请号：EP15819737.6

    申请日：2015-07-07

    申请人： Stora Enso Oyj

    发明人： HÅKANSSON, Philip

    IPC分类号： D21H17/69 ,  C09C1/02 ,  D21H17/67 ,  D21H17/68 ,  D21H23/76 ,  D21H17/65 ,  D21H17/66 ,  D21H23/04

    CPC分类号： D21H17/68 ,  C09C1/0081 ,  C09C1/021 ,  C09C1/28 ,  C09C1/30 ,  D21H17/29 ,  D21H17/44 ,  D21H17/65 ,  D21H17/66 ,  D21H17/675 ,  D21H21/10 ,  D21H23/04

    摘要： The invention relates to a method of making paper or paperboard comprising the steps of; a. providing a stock suspension; b. adding a mixture of alkali-metal silicate and precipitated calcium carbonate to said stock suspension; c. adding an acidic media to said stock suspension substantially directly before and/or after step (b) d. forming a web of the stock suspension obtained in step (d) e. drying said web. The addition of a mixture of alkali-metal silicate and PCC and of an acidic media to the stock suspension in accordance with the invention improves the bonding between the fibers and the filler (PCC), whereby problems related to dusting is decreased. Moreover, the method enables the addition of a higher amount of fillers to the paper without substantially affecting the strength.

    摘要翻译： 本发明涉及一种制造纸或纸板的方法，包括以下步骤： 一个。 提供股票暂停; 湾 向所述原料悬浮液中加入碱金属硅酸盐和沉淀碳酸钙的混合物; C。 基本上直接在步骤（b）d之前和/或之后向所述原料悬浮液中加入酸性介质。 形成步骤（d）中获得的原料悬浮液的网。 干燥所述网。 根据本发明将碱金属硅酸盐和PCC和酸性介质的混合物加入到原料悬浮液中改善了纤维和填料（PCC）之间的粘合，从而降低了与除尘有关的问题。 此外，该方法能够在不显着影响强度的情况下向纸中添加更多量的填料。