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Core-shell type tertiary carbon redispersible latex powder and preparation method thereof

A technology of redispersing latex powder and core-shell type, which is applied in the direction of powder coatings, coatings, paints containing biocide, etc., and can solve the problem that dry powder coatings are not resistant to high enough scrubbing times, the product is difficult to achieve high quality, and the use of latex powder is limited To achieve the effect of strong water resistance, film formation without softening, film formation and stickiness

Active Publication Date: 2019-10-01
河北四友卓越科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a dilemma faced by currently known dry powder coatings is that the durability of the dry powder coatings is not high enough to withstand brushing, making it difficult to achieve high-quality products.
Moreover, there is still a problem in the dry powder coating with latex powder added. The film formed by high addition ratio is easy to become soft and sticky, has poor anti-blocking property, and is not resistant to staining, thus limiting the amount of latex powder used in dry powder coatings.

Method used

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  • Core-shell type tertiary carbon redispersible latex powder and preparation method thereof
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  • Core-shell type tertiary carbon redispersible latex powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0068] Embodiment 1-3, the preparation of core-shell type tertiary carbon emulsion :

[0069] Formulation table (unit is mass part):

[0070]

[0071]

[0072] Preparation:

[0073] The emulsion polymerization reactor is a reaction flask equipped with a reflux condenser, a stirrer, a thermometer, and a monomer and initiator feeding tube. Use a peristaltic pump to inject the monomer pre-emulsion and initiator into the reactor. The reactor was heated with a water bath.

[0074] Prepare stable core and shell monomer pre-emulsions by adding monomers to a vigorously stirred aqueous solution according to the formula table. The reactor initial material was heated to 60° C. under nitrogen flow, and when it reached 60° C., the nitrogen flow was stopped, and 10% of the total mass of the core layer monomer pre-emulsion was added into the reactor. When the material in the container has been polymerized, the reflux of vinyl acetate stops, the temperature reaches 76°C, and then m...

Embodiment 4-6

[0079] Example 4-6, preparation of core-shell copolymerized tertiary carbon redispersible latex powder:

[0080] Formulation table (unit is mass part):

[0081]

[0082] Embodiment 4-6 preparation method:

[0083] The equipment is a centrifugal spray dryer, and the preparation steps are as follows:

[0084] (1) Make 0588 polyvinyl alcohol protective colloid into 20% aqueous solution.

[0085] (2) Add the tertiary carbon polymer emulsion and protective colloid aqueous solution into the container, start stirring at 1000r / min for 10 minutes, add water and stir for 5 minutes, and configure it as a pre-spraying feed solution with a solid content of 40%.

[0086] (3) Turn on the heating and induced draft fan of the centrifugal spray dryer, and heat the incoming air to 130°C.

[0087](4) Turn on the centrifugal atomizer (turntable diameter 50mm), make the centrifugal speed reach 25000rpm, turn on the feeding pump, slowly increase the feeding speed, control the outlet temper...

Embodiment 7-9

[0093] Embodiment 7-9, the preparation of tertiary carbon dry powder coating:

[0094] The tertiary carbon redispersible latex powder in the above examples of the present invention is applied to the preparation of dry powder coatings.

[0095] Buy a commercially available VAE redispersible latex powder as a contrast example, and its product index is as follows:

[0096] Exterior white powder, free flowing Solid content ≥98.0％ Ash (1000℃) 10±2％ Bulk density (g / l) 400～600 Average particle size (μm) ～80 50% aqueous solution viscosity (Pas) 1.0～3.0 PH value 6～8 Minimum film forming temperature (°C) 0℃

[0097] Formula table of dry powder coating (unit is mass part):

[0098]

[0099] Preparation:

[0100] (1) Add the pigments and fillers to a double-helix mixer and stir for 5 minutes, then add tertiary carbon redispersible latex powder, cellulose and other additives, and mix for 40 minutes, and then use a 120-mesh vi...

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Abstract

The invention discloses a core-shell type tertiary carbon redispersible latex powder and a preparation method thereof. The core-shell type tertiary carbon redispersible latex powder is prepared from atertiary carbon polymer emulsion, a protective glue and an anti-caking agent through spraying and drying, wherein the tertiary carbon polymer emulsion is a core-shell type tertiary carbon polymer emulsion which is obtained by copolymerizing vinyl versatate and other monomers; the glass transition temperature Tg of a shell layer is lower than or equal to 5 DEG C; the glass transition temperature Tg of a core layer is higher than or equal to 13 DEG C. The core-shell type tertiary carbon redispersible latex powder can be used for producing environment-friendly coatings with high property and zero VOC (volatile organic compounds) without filming additives.

Description

technical field [0001] The present invention relates to the field of polymer emulsion, redispersible latex powder and water-based latex coating; More specifically, the present invention relates to a kind of production zero VOC environmental protection coating required, based on the core-shell type polymer emulsion of tertiary carbonic acid vinyl ester Tertiary carbon redispersible latex powder and its preparation method. Background technique [0002] Volatile organic compounds (Volatile Organic Compounds) have been identified as one of the culprits of smog. They not only pollute the environment and destroy the ecology, but also cause serious harm to human health and cause a huge waste of resources. At present, the annual emission of VOC in the field of coatings in my country exceeds 7 million tons, which has become one of the main sources of VOC emissions in my country. Therefore, reducing the VOC emissions in and related to coatings is an urgent problem to be solved. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F263/04C08F218/08C08F218/10C09D151/00C09D5/16C09D5/03
CPCC08F263/04C08K2003/265C09D5/03C09D5/033C09D5/1668C09D5/1687C09D151/003C08F218/08C08F218/10C08L29/04C08K3/36C08K3/26C08K3/34
Inventor 孙兰波娄英春杨涛刘汇辛李洪海梁斌张丰王勇军李占先
Owner 河北四友卓越科技有限公司
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