Method of preventing polymer scale formation

    公开(公告)号:US5034478A

    公开(公告)日:1991-07-23

    申请号:US446699

    申请日:1989-12-06

    IPC分类号: C08F2/00

    CPC分类号: C08F2/004

    摘要: A method of preventing polymer scale deposition in polymerization of a monomer having an ethylenically double bond, wherein said polymerization is carried out in a polymerization vessel in which its inner wall surface has been previously coated with a coating solution comprising:(A) a condensate of a phenolic hydroxy group-containing compound,(B) at least one member selected from the group consisting of metal compounds and inorganic colloids, and(C) at least one member selected from the group consisting of dyes and pigments. This method makes it possible to prevent polymer scale deposition regardless of polymerization conditions such as the kind of monomers, the type of polymerization vessel, etc.

    Method for preventing polymer scale deposition in the polymerization of
an ethylenically unsaturated monomer
    4.
    发明授权
    Method for preventing polymer scale deposition in the polymerization of an ethylenically unsaturated monomer 失效
    防止烯属不饱和单体聚合中聚合物垢沉积的方法

    公开(公告)号:US4622245A

    公开(公告)日:1986-11-11

    申请号:US660719

    申请日:1984-10-15

    IPC分类号: C08F2/00

    CPC分类号: C08F2/004

    摘要: The invention provides a novel method for preventing deposition of polymer scale on the walls of a polymerization reactor in the course of polymerization of various ethylenically unsaturated monomers such as the suspension polymerization of vinyl chloride in an aqueous medium. The method comprises coating the reactor walls with a coating solution containing (a) a polymeric compound having hydroxyl groups such as a polyvinyl alcohol and (b) a silicic acid compound such as water glass followed by drying of the coated surface and washing thereof with water.

    摘要翻译: 本发明提供了一种用于在聚合各种烯属不饱和单体(例如氯乙烯在水性介质中的悬浮聚合)过程中防止聚合物垢沉积在聚合反应器壁上的新方法。 该方法包括用包含(a)具有羟基的聚合物如聚乙烯醇和(b)硅酸化合物如水玻璃的涂覆溶液涂覆反应器壁,然后干燥涂覆的表面并用水洗涤 。

    Method for preventing polymer scale deposition in polymerization of
ethylenically unsaturated monomers
    5.
    发明授权
    Method for preventing polymer scale deposition in polymerization of ethylenically unsaturated monomers 失效
    防止烯属不饱和单体聚合中聚合物垢沉积的方法

    公开(公告)号:US4528336A

    公开(公告)日:1985-07-09

    申请号:US361040

    申请日:1982-03-23

    CPC分类号: C08F2/004

    摘要: The invention provides a very efficient method with highly durable effect for preventing polymer scale deposition on the reactor walls and other surfaces coming into contact with the monomer during polymerization of an ethylenically unsaturated polymerizable monomer in an aqueous medium such as in the suspension polymerization of vinyl chloride. The method comprises coating the reactor walls, prior to polymerization, with a novel coating material which is a condensation product obtained by the condensation reaction of an aromatic amine compound such as aniline and an aromatic nitro compound such as nitrobenzene in the presence of a mineral acid and a specified condensation catalyst. It is sometimes preferable that the condensation product is basified or treated with an alkali or ammonium compound to be imparted with a modified solubility behavior.

    摘要翻译: 本发明提供了一种非常有效的方法,其具有高度耐久的效果,用于防止聚合物垢沉积在反应器壁和其它与单体接触的表面中,所述表面在烯属不饱和可聚合单体在水性介质中聚合期间,例如在氯乙烯的悬浮聚合中 。 该方法包括在聚合之前用反应器壁涂覆新的涂料,该涂料是通过在无机酸存在下芳族胺化合物如苯胺和芳族硝基化合物如硝基苯的缩合反应获得的缩合产物 和指定的缩合催化剂。 有时优选将缩合产物碱化或用碱或铵化合物处理以赋予改性的溶解行为。

    Method for preventing polymer scale deposition in the polymerization of
an ethylenically unsaturated monomer in an aqueous medium
    6.
    发明授权
    Method for preventing polymer scale deposition in the polymerization of an ethylenically unsaturated monomer in an aqueous medium 失效
    防止水性介质中烯属不饱和单体聚合中的聚合物垢沉积的方法

    公开(公告)号:US4272622A

    公开(公告)日:1981-06-09

    申请号:US149414

    申请日:1980-05-13

    CPC分类号: C08F2/004

    摘要: The invention provides a novel method for preventing polymer scale deposition on the reactor walls in the polymerization of vinyl chloride, vinylidene chloride, styrene and other ethylenically unsaturated monomers in an aqueous medium. The inventive method comprises coating the reactor walls, piror to polymerization, with an aqueous coating solution containing a water-soluble ionic polymer and a water-soluble ionic dye having counteractive polarity to the polarity of the water-soluble ionic polymer compound. In other words, a water-soluble anionic dye is used as combined with a water-soluble cationic polymer and a water-soluble cationic dye is used as combined with a water-soluble anionic polymer compound. The scale preventing effect obtained with the combined use of the above two components can be further increased when the aqueous coating solution is admixed with a monovalent alcohol having from 3 to 6 carbon atoms in a molecule owing to the improved spreading of the aqueous solution on the metal surface of the reactor walls. The effect of the method is so remarkable and reliable that polymerization of styrene and other monomers can be performed in a stainless steel polymerization reactor, said polymerization being hitherto conducted in a glass-lined reactor due to the lack of an efficient method for preventing polymer scale deposition on the stainless steel surfaces.

    摘要翻译: 本发明提供了一种用于在水性介质中聚合氯乙烯,偏二氯乙烯,苯乙烯和其它烯键式不饱和单体的聚合物垢沉积在反应器壁上的新方法。 本发明的方法包括用含有水溶性离子聚合物的水性涂料溶液和反应器壁,吡喃聚合反应,并且与水溶性离子聚合物化合物的极性具有相反极性的水溶性离子染料。 换句话说,使用水溶性阴离子染料与水溶性阳离子聚合物组合,并且使用水溶性阳离子染料与水溶性阴离子聚合物化合物组合。 当水性涂料溶液与分子中具有3至6个碳原子的一价醇混合时,可以进一步提高通过组合使用上述两种组分获得的防垢效果,这是由于水溶液在 反应器壁的金属表面。 该方法的效果是非常显着和可靠的,苯乙烯和其它单体的聚合可以在不锈钢聚合反应器中进行,所述聚合迄今为止在玻璃衬里的反应器中进行,因为缺乏有效的防止聚​​合物垢的方法 沉积在不锈钢表面上。

    Method of preventing polymer scale formation
    7.
    发明授权
    Method of preventing polymer scale formation 失效
    防止聚合物垢形成的方法

    公开(公告)号:US5298220A

    公开(公告)日:1994-03-29

    申请号:US000703

    申请日:1993-01-05

    IPC分类号: C08F2/00 C08F2/02

    CPC分类号: C08F2/004

    摘要: This process is a method of preventing polymer scale formation in a polymerization vessel during the polymerization of a monomer having an ethylenically unsaturated double bond. The inner wall surface of a polymerization vessel is coated with a water-based coating solution containing (a) a water-soluble anionic dye and (b) at least water-insoluble cationic dye or water-insoluble nitrogen-containing organic compound, where the water-based coating solution has a pH of 7 or less. The coating solution is applied and then dried to form a coating.

    摘要翻译: 该方法是在具有烯键式不饱和双键的单体聚合期间防止聚合容器中聚合物垢形成的方法。 聚合容器的内壁表面涂覆有含有(a)水溶性阴离子染料和(b)至少水不溶性阳离子染料或水不溶性含氮有机化合物的水性涂料溶液,其中 水性涂​​布液的pH为7以下。 涂布溶液,然后干燥以形成涂层。

    Method of preventing polymer scale deposition in a polymerization vessel
    8.
    发明授权
    Method of preventing polymer scale deposition in a polymerization vessel 失效
    聚合物中存在聚合物沉降的方法

    公开(公告)号:US5115051A

    公开(公告)日:1992-05-19

    申请号:US447856

    申请日:1989-12-08

    IPC分类号: C08F2/00

    CPC分类号: C08F2/004

    摘要: A method of preventing polymer scale deposition in a polymerization vessel during polymerization of a monomer having an ethylenically double bond, wherein said polymerization is carried out in a polymerization vessel of which the inner wall has been previously first coated with(A) a coating solution comprising a condensate of an aromatic compound and at least one member selected from the group consisting of metal compounds and inorganic colloids, and the coating thus formed has been then coated with(B) a coating solution comprising at least one member selected from the group consisting of anionic polymeric compounds, amphoteric polymeric compounds and hydroxyl group-containing polymeric compounds; and a polymerization vessel having a coating thus formed. According this method, polymer scale deposition on the inner wall, etc. of the polymerization vessel can be effectively prevented.

    Method of preventing polymer scale deposition
    9.
    发明授权
    Method of preventing polymer scale deposition 失效
    防止聚合物沉降沉积的方法

    公开(公告)号:US5053466A

    公开(公告)日:1991-10-01

    申请号:US446681

    申请日:1989-12-06

    IPC分类号: C08F2/00

    CPC分类号: C08F2/004

    摘要: A method of preventing polymer scale deposition in a polymerization vessel during polymerization of a monomer having an ethylenically double bond, wherein said polymerization is carried out in a polymerization of which the inner wall has been previously coated with a coating solution comprising:(A) an aromatic amine-based condensate,(B) at least one member selected from the group consisting of alkali metal salts and ammonium salts of a sulfonation product prepared by sulfonation of an aromatic amine-based condensate, and(C) at least one member selected from the group consisting of metal compounds, inorganic colloids, dyes and pigments; a scale preventive agent comprising the components (A), (B) and (C); and a polymerization vessel having a coating comprising the scale preventive agent. According the method, polymer scale deposition on the inner wall, etc. of the polymerization vessel can be effectively prevented.

    Process for production of vinyl polymer
    10.
    发明授权
    Process for production of vinyl polymer 失效
    乙烯基聚合物生产工艺

    公开(公告)号:US4758639A

    公开(公告)日:1988-07-19

    申请号:US94020

    申请日:1987-09-03

    CPC分类号: C08F2/004

    摘要: A process for production of a vinyl polymer by suspension polymerization or emulsion polymerization of at least one kind of vinyl monomer in an aqueous medium is disclosed.In this process, the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization having a surface roughness of not greater than 5 .mu.m and being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated .pi. bonds. According to this process, scaling on the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.

    摘要翻译: 公开了通过在水性介质中悬浮聚合或至少一种乙烯基单体的乳液聚合制备乙烯基聚合物的方法。 在该方法中,聚合反应在聚合反应器中进行,其内壁表面及其辅助设备的部分可在聚合过程中与单体接触,表面粗糙度不大于5μm,并预先涂覆 防垢剂包含选自染料,颜料和具有至少5个共轭π键的芳族或杂环化合物中的至少一种。 根据该方法,可以有效且可靠地防止聚合反应器内壁表面的缩小。