Silicone sealant having adjustable flow properties
A technology of silicone and diorganosiloxane, which is applied in the field of one-component moisture-curing silicone composition, can solve the problems of lack of fluidity and achieve excellent mechanical properties
Active Publication Date: 2020-10-13
SIKA TECH AG
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
The disadvantage is that the use of diacetamido-functional silanes is mandatory and the filler must be hydrophobized
Here too, there is no way to adjust the degree of flow behavior
Method used
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Embodiment
[0119] Specific embodiments of the present invention are described below, but they do not limit the scope of the present invention.
[0120] The chemicals used are listed in Table 1 below.
[0121]
[0122] Table 1: Chemicals used.
[0123] If not stated otherwise, the data are by weight.
[0124] The content parts (parts by weight) of the ingredients of the exemplary compositions given in the following Tables 2 to 4 were weighed and mixed under vacuum at 2000 rpm for 20 s on a Hauschild SpeedMixer at 23° C. and 50% r.F. The obtained mixture was stored airtightly at 23°C.
[0125] In addition, Tables 2 to 4 contain an overview of the measurement results. All tests were performed at 23°C and 50% r.F. (relative humidity).
[0126] After curing the samples for 7 days at 23° C. and 50% r.F., the Shore A hardness was determined on a Shore A hardness tester from the company Bareiss according to DIN ISO 7619-1. For determination of the Shore A hardness, circular specimens wit...
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Abstract
The invention relates to a single-component, moisture-hardening silicone composition comprising 100 parts by weight of a crosslinkable polydiorganosiloxane OH-PDMS having silanol end groups, 5 to 20 parts by weight of at least one hydrophilic silicic acid KS, 1 to 10 parts by weight of at least one organoalkoxysilane or organoalkoxysiloxane crosslinker V, which contains at least 2 alkoxysilane groups, 1 to 7 parts by weight of an organoalkoxysilane or organoalkoxyiloxane AS, which contains at least one amino alkyl group having a primary amino group, 0.1 to 7 parts by weight of at least one tincatalyst K, up to 5 parts by weight of an organoalkoxysilane or organoalkoxysiloxane OS, which contains at least two alkoxysilane groups, wherein the silicone composition contains less than 1.0 wt% water, relative to the total composition, provided that the reactivity for hydrolysis of the organoalkoxysilane or organoalkoxysiloxane OS is higher than the reactivity for hydrolysis of the organoalkoxysilane or organoalkoxysiloxane crosslinker V. The single-component composition is suitable as a low-modulus adhesive or sealant and as a coating or casting compound and can be formulated either as aself-leveling or as a stable composition.
Description
technical field [0001] The present invention relates to a one-component moisture-curing silicone composition, a method of bonding or joining using the composition and the use of the composition. Background technique [0002] Silicones are known compositions which have long been used as adhesives or sealants. The silicones can be configured in the form of one-component or two-component silicone preparations and contain polyorganosiloxanes and crosslinkers as main components. A distinction is made between cold-crosslinking RTV silicones (RTV=room temperature crosslinking or room temperature vulcanization) and heat-crosslinking HTV silicones (HTV=high temperature crosslinking or high temperature vulcanization). One-part and two-part RTV silicones are also known as RTV-1 silicones or RTV-2 silicones. [0003] RTV-1 silicone has been known for a long time. It is also known that such formulations can be cured on the basis of so-called neutral crosslinking. Neutral crosslinking...
Claims
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IPC IPC(8): C09J183/04C08L83/04
CPCC08G77/16C09J183/04C08L83/04C08K3/36C08K5/44C08K5/5419C08K5/5425C08K5/57C09D7/61C08L2205/025C08L2312/00C09D183/04C09J5/00C09J11/04C09J2483/00C09K3/1018C09K2200/0685
Inventor M·弗里德耳
Owner SIKA TECH AG