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Aqueous nanocomposite dispersions: processes, compositions, and uses thereof

A nanocomposite, dispersion technology, applied in nanotechnology, silicon compounds, nanotechnology, etc., can solve problems such as poor water resistance, reduced polymer properties, uneven polymer particle size, etc., to increase strength and avoid processing. Problems, Effects of High Aggregation Rates

Inactive Publication Date: 2005-09-07
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large amounts of emulsifiers may reduce the performance of the polymer in the end application (e.g. poor water resistance)
In addition, large amounts of emulsifiers can adversely affect the formation of polymer latex particles
Non-uniform polymer latex particle formation can lead to variations in emulsion droplet size, which in turn can lead to non-uniform polymer particle sizes
Large amounts of emulsifier can also lead to the formation of "secondary particles", which can further broaden the particle size distribution
Also, there are often problems associated with broad particle size distributions, such as shear instability of emulsions, variability in polymer molecular weight (resulting in variations in polymer process and properties), and degradation of properties when dried into a powder (e.g., by dust due to the presence of small polymer particles)
[0022] The above problems add to the difficulty of preparing latex polymer particles by emulsion polymerization
More specifically, the aforementioned problems add to the difficulty in preparing multi-stage latex polymer particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0122] Table I summarizes exemplary and comparative compositions. The compositions in Table 1 were varied in terms of whether the composition was polymerized in single-stage or multi-stage, the weight percent of unmodified clay added, and whether the clay was physically mixed with the aqueous emulsion copolymer (herein referred to as "mixing" ”), or during the polymerization process (referred to herein as “in situ”). The physical mixing of the clay with the copolymer and the in-situ polymerization of the acrylic monomers in the presence of clay platelets are carried out in an aqueous emulsion medium.

[0123] Tables II-VI provide a comparison of the dielectric relaxation of thin polymer films comprising exemplary polymer clay nanocomposites and comparative compositions. These exemplary and comparative compositions were cast on the same aluminum substrates or coupons to demonstrate the difference in mechanical properties between polymer clay nanocomposites and polymer comparat...

Embodiment 1

[0134] Example 1 (single stage, in situ copolymerization 50MMA / 50BA with 5% clay)

[0135] A reaction mixture comprising a monomer mixture of MMA and BA in a weight ratio of 50:50 and an aqueous clay dispersion was polymerized using the emulsion polymerization process described above to yield a nanocomposite dispersion containing 5% clay by dry weight. The final size of the polymer particles was 92 nm. The total solids content of the nanocomposite dispersion was 23.16% by weight. A portion of the nanocomposite dispersion was coated on a 0.002 cm thick aluminum sheet to obtain a 0.015 cm thick film. The overall assembly of membrane and substrate was dried in a vacuum oven at 75°C overnight. After drying, 2.4439 cm was cut from the laminate 2 The surface area of ​​the discs was evaluated using dielectric relaxation spectroscopy, and the evaluation results are provided in Table II. As shown in Table II, the dielectric storage factor of the composition of Example 1 was at leas...

Embodiment 2

[0136] Example 2 (50MMA / 50BA copolymer dispersion mixed with 5% clay)

[0137] The emulsion prepared copolymer of Comparative Example 1 was mixed with an appropriate amount of clay aqueous dispersion to obtain a nanocomposite dispersion of 5% clay by dry weight. The mixture was thoroughly homogenized by the method described in the General Emulsion Procedure. A portion of the homogenized mixture was coated on a 0.002 cm thick aluminum sheet to obtain a 0.004 cm thick film. The overall assembly of membrane and substrate was dried in a vacuum oven at 75°C overnight. After drying, 2.4439 cm was cut from the laminate 2 surface area of ​​the discs and using dielectric relaxation spectroscopy to evaluate the improvement of the dielectric storage factor. The data presented in Table II show that the dielectric storage factor is slightly greater than that of Comparative Example 1.

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Abstract

Processes for utilizing various emulsion polymerization procedures for preparing aqueous nanocomposite dispersion are disclosed. The disclosed processes include both insitu polymerization in the presence of at least partially exfoliated unmodified clays as well as admixtures of polymer dispersions with at least partially exfoliated unmodified clay dispersions. The disclosed nanocomposite dispersion are useful for preparing a variety of materials, such as coatings, adhesives, caulks, sealant, plastic additives, and thermoplastic resins. Processes for preparing polymer clay nanocomposite powders and use of these powders as plastic resin and plastics additives are also disclosed.

Description

[0001] The application date is September 17, 2001, the international application number is PCT / US01 / 28994, the application number entering the Chinese national phase is 01816051.4, and the title of the invention is "Aqueous nanocomposite dispersion: method, composition and its Divisional application of the Chinese application for purposes". technical field [0002] The present invention generally relates to aqueous polymer clay nanocomposite dispersions and methods of making and using the same. More specifically, the present invention relates to a method for preparing polymeric clay nanocomposites using unmodified clays in aqueous systems. The invention also relates to the use of these nanocomposite compositions, for example as thermoplastic resins, capstocks, coatings, sealants, caulks, adhesives and plastic additives. Background technique [0003] Thermoplastic resins can be used as plastic materials alone or in combination with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44C01B33/40C04B22/06C04B24/26C04B103/40C08F2/00C08F2/10C08F2/16C08F2/44C08F265/04C08F265/06C08F291/00C08F292/00C08K9/00C08K9/04C08K9/08C08L51/00C08L101/00C09D5/00C09D5/02C09D7/12C09D11/02C09D125/00C09D133/00C09D135/00C09D151/00C09D151/10C09D157/10C09D201/00C09J11/04C09J151/00C09J201/00
CPCC08K2201/011C08F2/44C08F292/00B82Y30/00C08K9/08C08F265/06C08K9/04C08F2/00B82B3/00
Inventor 周春雄E·E·拉夫洛K·D·尼格利亚D·P·劳拉R·V·斯隆
Owner ROHM & HAAS CO
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