Patent Application
20070001335
1. Field of the Invention
This invention relates to silicone rubber compound, particularly to a method for manufacturing silicone rubber compound with anti-bacteria function and having a balanced pristine semi-transparent property.
2. Description of the Prior Art
There is wide variety of anti-bacteria silicone rubber compound products such as nipples, nose suckers, baby hygienic articles, etc. Generally speaking, makers firstly prepare anti-bacteria silicone rubber compound and then pour it in molds for injection molding and hardened as finished products. But, most of products made of the anti-bacterial silicone rubber compound are not transparent, attached with very tiny grains irregularly on its inner surface.
A conventional method for manufacturing products with anti-bacteria silicone rubber compound is not so ideal, resulting in products often formed with undesirable tiny grains on an outer or inner surface by an anti-bacteria agent after hardened. So their outer appearance may be impaired to have inferior looking for selling, and the tiny grains may be mistaken as dirty spots for users difficult to discern, so they make up confusion in cleaning.
This invention offers a method for manufacturing anti-bacteria silicone rubber compound, in which an anti-bacteria basic material is made by mixing a anti-bacteria agent with silicone oil in a proper proportion and temperature, and then the anti-bacteria basic material is rolled and pressed several times for dispersion to get dispersed anti-bacteria basic material. Then the dispersed anti-bacteria basic material is added in a transparent two-component-liquid-type A/B basic material with proper viscosity and then this mixture is stirred several times for dispersion to get anti-bacteria silicone rubber compound as a semi-product, which is then filtered and poured in an injecting molding machine for making various finished anti-bacteria silicone rubber compound products. Thus finished anti-bacteria silicone rubber compound products not only have a good bacterial resisting effect, but also have a balance pristine semi-trans parent property, improving the flow of conventional silicone rubber compound products often attached with undesirable miscellaneous tiny grains.
This invention will be better understood by referring to the accompanying drawing, wherein:
A method for manufacturing anti-bacteria silicone rubber compound in the present invention, as shown in
(a) A first step: Making anti-bacteria basic material.
First prepare anti-bacteria agent 1 and silicone oil having viscosity 100 CS-500,000 CS, and then mix these two ingredients in the proportion 10:90-60:40. After that, the mixture is stirred in a universal stirring machine or a planetary stirring machine 3 for a first stage of low speed 0-5 rpm for 5-30 minutes, and for a second stage of high speed 15-60 rpm for 20-60 minutes, with these two stages control led in the temperature 20-60° C. Then the mixture becomes anti-bacteria basic material 4.
(b) A second step: Dispersing again the anti-bacteria basic material.
The anti-bacteria basic material 4 is rolled and pressed by three rollers 5 for dispersing 1-20 times, with the three rollers 5 kept in the temperature 15-50° C. getting dispersed anti-bacteria basic material 4a.
(c) A third step: Making the dispersed anti-bacteria basic material 4a into an anti-bacteria silicone rubber compound as a semi-finished product.
The dispersed anti-bacteria basic material 4a is added with 0.05-5 phr solely or evenly into a transparent two-component-liquid-type A/B basic material, which is a mixture of silicone oil 6 and a reinforcing agent 6b. After that, this mixture is poured in a planetary stirring machine 3a for stirring and dispersing for 1-5 times, with every stirring and dispersing action involving a first stage of low speed 10-50 rpm, a second stage of high speed 20-100 rpm, and a third stage of bubble removing by means of vacuuming with 1 Torr-100 Torr, and a fourth stage of low speed with bubble removing by means of vacuuming of 1 Torr-100 Torr, and a last fifth stage of high speed stirring and bubble removing by means of vacuuming with 1 Torr-100 Torr, with the temperature used in all the stages controlled in the scope of 15-70° C. Then the mixture becomes an anti-bacteria silicone rubber compound as a semi-finished product.
A fourth step: Manufacture anti-bacteria silicone rubber compound product wholly completed.
The anti-bacteria silicone rubber compound 7 (or the semi-finished product) is filtered by a metal or nylon net with the meshes 50-300, and then poured in an injecting molding machine 9 for molding various anti-bacteria semi-transparent silicone rubber compound products 10.
It is important to mention that the method in the invention cannot only makes anti-bacteria silicon products having bacteria resisting function, but also having balanced pristine semi-transparency without any undesirable tiny grains on an inner or an outer surface so that a user can easily discern dirty spots for cleaning to keep the products clean and neat.
While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.
