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Powder comprising silica-coated zinc oxide, organic polymer composition containing the powder and shaped article thereof

A technology of silicon dioxide and zinc oxide, applied in the direction of transportation and packaging, nanotechnology for materials and surface science, thin material processing, etc., can solve problems such as puncture, elongation factor limitation, difficult to provide composition, etc.

Inactive Publication Date: 2005-08-24
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned resins are easily decomposed and additionally endowed with the performance of degradation due to the reaction with zinc ions, so it is difficult to provide a composition that is actually durable
[0009] Also, in the case of fibers obtained by spinning and dyeing compositions containing traditional zinc oxide particles, another difficulty arises that the release of zinc ions into the dye solution cannot be avoided
[0010] Moreover, since conventional coated zinc oxide particles allow large particles to coexist, the handling of resin compositions containing such conventional particles has the following problems: fiber breakage often occurs during the formation of fine fibers such as multifilaments; In the formation of very thin blown films, punctures occur; and in tape formation, the elongation factor is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] Mix deionized water (18.25L), ethanol (22.8L, Junsei Chemical Co., Ltd. product) and 25% by mass ammonia water (124mL, Taisei Chemical Industries Co., Ltd. product) in the reactor (50L), make as Zinc oxide particles (1.74 kg, high-purity zinc oxide UFZ-40; primary particle size 27 nm, product of Showa Titanium Co., Ltd.) as a raw material were dispersed in the mixture to prepare a suspension A. Then, tetraethoxysilane (1.62 L, product of GE Toshiba Silicone) and ethanol (1.26 L) were mixed to prepare a solution B.

[0189] While stirring suspension A, solution B was added at a constant rate over 9 hours and the resulting solution was allowed to age for 12 hours. Both film formation and aging were performed at 45°C. Thereafter, solid matter was separated by centrifugal filtration, vacuum-dried at 50°C for 12 hours, and dried with 80°C hot air for 12 hours. Subsequently, the dried substance was ground with a jet mill, thereby obtaining silica-coated zinc oxide fine part...

Embodiment 2

[0205] The procedure of Example 1 was repeated, but polyethylene (Japan Polyolefins Co., Ltd., JH607C) was used instead of polypropylene (SunAllomer Ltd., product PW600N), thereby producing an organic polymer composition masterbatch.

[0206] In a similar manner to that described in Example 1, the processability of the obtained organic polymer composition was evaluated using a Labo Plastomill. As a result, it was found that the resin pressure rise was as low as 0.7 MPa, and the workability was good.

[0207] The organic polymer composition masterbatch thus obtained was diluted with polyethylene ((Japan Polyolefins Co., Ltd., product, JH607C), and tested for damage to weather resistance by photocatalysis. As a result, it was found that the change in haze was only 0.2 , indicating that the damage to weather resistance caused by photocatalysis was minimal. This indicates that the resulting fine particles of ZnO coated with silica resulted in extremely low damage to weather resist...

Embodiment 3

[0209] The procedure of Example 1 was repeated except that polyamide (EMS-Showa Denko K.K., A28GM) was used instead of polypropylene (SunAllomer Ltd., product PW600N), thereby producing an organic polymer composition masterbatch.

[0210] The operation of Example 1 was repeated, but the thermal conditions were changed to 270(inlet)-270-270-270°C, and the processability of the obtained organic polymer composition was evaluated using a Labo Plastomill. As a result, it was found that the rise in resin pressure was as low as 2.1 MPa, and the workability was good.

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Abstract

ABSTRACT A powder comprising silica-coated zinc oxide fine particles in which the surface of each particle is coated with silica, wherein large particles of 5 mum or more account for 0.1 mass% or less. A powder comprising surface-hydrophobicized silica-coated zinc oxide fine particles in which the silica-coated zinc oxide fine particles whose surfaces have been coated with silica are further treated with a hydrophobicity-imparting agent, wherein large particles of 5 mum or more account for 0.1 mass% or less.

Description

field of invention [0001] The present invention relates to zinc oxide for use in organic polymer compositions, rubber products, paper, cosmetics, paints, printing inks, etc., and more particularly to powders containing silica-coated zinc oxide particles having a small amount of large particles As well as organic polymer compositions comprising the powder and shaped products formed therefrom. Background technique [0002] Zinc oxide, also known as spangles, has long been known as a white pigment. Zinc oxide is endowed with the following optical properties: When zinc oxide is reduced to fine particles with a diameter of about half the wavelength of visible light, these particles allow visible light to pass through, because the scattering effect of zinc oxide particles on light is significantly reduced, and by virtue of zinc oxide The excellent UV absorption effect selectively absorbs ultraviolet rays. [0003] Regarding an ultraviolet absorber using such zinc oxide particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/02C08K9/06C09C1/04
CPCC01P2004/84C08K9/02C01P2006/12C01P2004/64B82Y30/00C09C1/0081C09C1/043Y10T428/2993C01P2004/86C09C1/3661C01P2004/61C08K2201/005C08K2201/006
Inventor 石井伸晃田中淳青柳辉
Owner RESONAC HOLDINGS CORPORATION