Use of Magnesium Compounds to Improve Water Resistance of Cured Silicone Rubber
A technology for curing silicone rubber and magnesium compounds, used in transportation and packaging, thin material processing, etc., can solve problems such as poor appearance, poor appearance, poor appearance and strength, and achieve the effect of improving water resistance, long-term use, and reducing whitening
Active Publication Date: 2015-11-25
DOW CORNING TORAY CO LTD
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Problems solved by technology
[0011] However, it has been found that parts made of silicone rubber such as hoses and gaskets used in contact with water containing chloride ions such as tap water may have poor appearance such as whitening or insufficient high-temperature steam resistance after long-term use.
This problem is more obvious in warm water, especially warm water above 40°C. For example, it is easy to occur on silicone rubber valves, hoses, gaskets, joints such as kettles and water heaters, or transfer pipes used to transfer beverages and food. Poor appearance such as whitening
Even if aluminum magnesium carbonate is blended into the silicone rubber member, this appearance defect cannot be prevented.
[0012] It is speculated that the aforementioned poor appearance and insufficient strength may be caused by cleavage of siloxane bonds by chloride ions in water
However, except for some natural water, it is difficult to make the water free of chlorine, so it is necessary to improve silicone rubber products
Method used
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[0087] The present invention will be described in detail below through examples, but the present invention is not limited to examples. In addition, hereinafter, "part" means a part by weight (mass).
[0088] Test pieces of cured silicone rubbers of Examples 1 to 19 and Comparative Examples 1 to 11 having the compositions shown in Tables 1 to 4 were prepared. The meaning of each term in Tables 1 to 4 is as follows.
[0089] [Silicone rubber base compound A]
[0090] 100 parts by weight of dimethylsiloxane, which is composed of 99.8 mol% dimethylsiloxane units and 0.13 mol% methylvinylsiloxane units, and whose ends are capped with dimethylvinylsiloxane groups Alkane-methyl vinyl siloxane copolymer raw rubber (polymerization degree 6,000), 42 parts by weight BET method specific surface area 300mm 2 / g of dry silica powder, and 14 parts by weight of dimethylsiloxane oligomers with a viscosity of 30mPa·s as a plasticizer, which are terminated with silanol groups, are put into ...
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Abstract
The present invention relates to a curable silicone rubber composition for various types of water supply components used in contact with water. The present invention also relates to a cured product of this composition, a water resistant cured silicone rubber, and use thereof. The present invention imparts good water resistance to a silicone rubber component used in contact with water, and the present invention prevents or decreases the occurrence of whitening or similar visual appearance failures, and the occurrence of insufficient strength to withstand high temperature steam.
Description
technical field [0001] The present invention relates to a curable silicone rubber composition used for various water-contact parts used in contact with water, a cured product of the composition, ie, a water-resistant cured silicone rubber, and its utilization. [0002] This application claims priority based on Japanese Patent Application No. 2011-009673 for which it applied to Japan on January 20, 2011, and uses the content here. Background technique [0003] Silicone rubber products are widely used in the food field because of their low pollution to food and beverages and good heat resistance. In addition, among water heater applications using nighttime electricity that have spread in recent years, applications where silicone rubber members come into contact with warm or hot water are also increasing. [0004] Water used for food and beverages, such as tap water, contains chloride ions (chloride ions), which are mainly used for sterilization. The chloride ions are added t...
Claims
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IPC IPC(8): C08L83/04C08K3/22C08K3/26C08K3/36C08K9/00
CPCC08K3/22C08G77/20C08K3/26C08K2003/2217C08K2003/267C08L83/04Y10T428/1397C08K5/14C08K2003/222C08K2003/2224C08L83/06C08K3/36C08K9/00
Inventor 长谷川知一郎森田好次
Owner DOW CORNING TORAY CO LTD