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Dispersant for pigment and use thereof

A technology of dispersant and dispersion liquid, applied in the field of dispersant for pigments and various inorganic particles, can solve the problems such as the lack of any instructions, the difficulty of dispersion and stabilization of the dispersant, the increase of the viscosity of the dispersion liquid, etc., and achieve long-term maintenance of low Excellent viscosity, stability over time, and excellent handling properties

Inactive Publication Date: 2012-05-16
TOAGOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, the slurry obtained in the water system decays due to the growth of various bacteria in the area below neutral, and the commercial value is impaired, so it is necessary to maintain a high pH value
[0007] For this requirement, the prior art dispersants shown above do not give satisfactory performance
For example, a dispersant composed of a polycarboxylic acid (salt) described in Patent Document 1, a monomer containing a carboxylic acid (salt) and a (meth)acrylic acid having 1 to 4 carbon atoms described in Patent Document 2 It is difficult to say that the dispersant composed of a copolymer of ester monomers can sufficiently suppress the increase in the viscosity of the dispersion liquid over time. In addition, in the inorganic pigment dispersant described in Patent Document 3, the resin constituent unit and the neutralizing agent are not specially formulated. Optimum, as an inorganic pigment dispersant, it is difficult to say that it is sufficiently suitable for dispersion stabilization, and there is no statement about pH

Method used

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  • Dispersant for pigment and use thereof
  • Dispersant for pigment and use thereof

Examples

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Embodiment

[0098] Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to the following Example.

[0099] In the following examples, "%" and "part" represent "mass%" and "mass part", respectively.

[0100] In addition, in the following example, the measurement of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of a (meth)acrylic-type (co)polymer, and the measurement or evaluation of the dispersion characteristic with respect to calcium carbonate were performed as follows.

[0101] [1] Weight average molecular weight (Mw) and number average molecular weight (Mn) of (meth)acrylic copolymer

[0102] The weight-average molecular weight (Mw) and the number-average molecular weight (Mn) of the (meth)acrylic (co)polymer were measured by the gel permeation chromatography (GPC) method of the following water system, the gel permeation chromatography of the water system The method is as follows: 100 μL of t...

manufacture example 1

[0124] ○Production example 1 [production of (meth)acrylic copolymer (B-1)]

[0125] (1) 114.8 g of isopropanol and 138.0 g of deionized water were filled into a four-necked flask, and the inner temperature was raised to 78°C while rotating and stirring the contents of the flask at 200 rpm. After the internal temperature became constant, 0.87 g of ammonium persulfate and 4.05 g of deionized water were added at once, and monomers consisting of 232.2 g of acrylic acid, 37.8 g of butyl acrylate, and 44.6 g of deionized water were continuously supplied for 6 hours after one minute. An aqueous solution (314.6 g in total) and a polymerization initiator aqueous solution (64.3 g in total) composed of 7.83 g of ammonium persulfate and 56.5 g of deionized water were mixed. After the continuous supply was completed, the inner temperature was kept at 78°C, and aging was performed for 1.5 hours, and then cooled to an inner temperature of 50°C. 500 mg of the reaction solution was collected ...

manufacture example 2

[0129] ○Production example 2 [production of (meth)acrylic copolymer (B-2)]

[0130] (1) In (1) of Production Example 1 (B-1), the monomer mixed aqueous solution was changed to 220.3 g of acrylic acid, polypropylene glycol monoacrylate [addition mole number of polyoxypropylene n=3, terminal hydroxyl group ( R 3 = H)] 49.7 g and a monomer mixed aqueous solution (314.6 g in total) composed of 44.6 g of deionized water were subjected to the same polymerization operation as in (1) of Production Example 1. After the reaction was completed, 500 mg of the reaction solution was collected and analyzed by gas chromatography. As a result, unreacted acrylic acid and polypropylene glycol monoacrylate were not detected.

[0131] (2) Next, the same operation as in (2) and (3) of B-1 was carried out to prepare an aqueous solution having a solid content concentration [(meth)acrylic copolymer content] of 45% (the obtained ( The meth)acrylic copolymer is referred to as "B-2").

[0132] (3) Usi...

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Abstract

Disclosed is a dispersant for pigments composed of (meth)acrylic acid (co)polymers or a dispersant for various inorganic particles, which has high dispersion stabilizing effect and is capable of stably dispersing pigments and various inorganic particles for a long time, while suppressing an increase of viscosity or a decrease of pH of slurry thereof over time and thus maintaining good fluidity of the slurry. Conventional slurry of an inorganic pigment that has a small particle size is likely to have an increased slurry viscosity since the interaction between the particles is strong due to increased surface areas and thus causes aggregation of the particles. Specifically disclosed is a dispersant for a pigment which is composed of a partially neutralized product of (A) a polymer of (a) an a,ss-unsaturated carboxylic acid monomer or (B) a copolymer that is composed of 80-99% by mole of a unit of (a) the a,ss-unsaturated carboxylic acid monomer and 1-20% by mole of another unit that is composed of either (b) a (meth)acrylate ester monomer and / or (c) a (meth)acrylate ester monomer of a polyalkylene glycol (with (a) + (b) + (c) being 100% by mole). The dispersant for a pigment is characterized in that ammonia or an organic amine is used as a neutralizing agent.

Description

technical field [0001] The present invention relates to a dispersant for pigments and various inorganic particles. To provide a dispersant for pigments of (meth)acrylic (co)polymers, more preferably a dispersant for calcium carbonate, in order to produce high-concentration pigment slurry with a solid content of more than 70%, especially with a small particle size When used as a pigment slurry, the dispersion stabilization effect is high, and good fluidity can be maintained and dispersed in the form of fine particles, and the thickening and pH drop of the slurry can be suppressed over time, and at the same time, it can be dispersed stably for a long time . Background technique [0002] Conventionally, homopolymers of acrylic acid (salt) and acrylic acid (salt) and other copolymerizable monomers have been known as dispersants for stably dispersing inorganic pigments such as calcium carbonate, kaolin, satin white, titanium dioxide, and talc in water. solid copolymers. [000...

Claims

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Application Information

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IPC IPC(8): B01F17/52C08F8/30C09D17/00C09K23/52
CPCC09D7/02C09D11/326C09D11/03C09D7/45
Inventor 竹本贵之浅井洋辅桐户洋一
Owner TOAGOSEI CO LTD
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