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Using the method of condensed liquid silicone rubber-HongYe silicone

Writer:TcoglorSource:www.szrl.net Date:2013-04-23

Using the method of condensed liquid silicone rubber

liquid silicone,liquid silicone rubber,liquid silicon-HongYe silicone

1, RTV-1 glue.

Due to the single component RTV silicone rubber has been extruded polymer, filler and crosslinking system, mixing and packaging in a container, so use ester the glue extruding, the moisture in the air can be vulcanized elastomer contact.
In order to obtain a good application effect, first of all should be based on the use of technical specifications, performance for the treatment object, parts of the shape and the economic cost, reasonable choice of RTV-1 glue; in addition, also must follow the provisions of the operation method, in addition to oil, cleaning and drying treatment to treat the substrate surface treatment, if the rubber is required sandpaper roughen the; if the substrate coated with the primer is dry, 2h after construction, in order to improve the bonding strength on RTV-1 substrate. Most primer is composed of organic solvent dilution higher reaction activity of silane coupling agent or other organic metal compounds, can be hydrolyzed shrinkage synthetic resin shaped active layer in the humid air, it plays a bond and coupling effect and the substrate surface, thereby increasing the adhesion of.
RTV-1 glue material also can be dispersed in a suitable solvent, spraying, dipping or coating to. Preparation of dispersion, must use dry solvents, and avoid contact with moisture in the air.

2, RTV-2 glue.

Method of use RTV-2 glue glue complex than RTV-1, usually by mixing, degassing, vulcanization process.

A. varieties selection and mixture condensation two-component RTV silicone rubber, according to need can be made into low viscosity products from free flowing, thixotropic or putty products until not flow. So when in use, first of all should be based on the technical requirements of parts and shapes, select the appropriate varieties. As for the encapsulation of components, rubber material should be capable of filling type; according to the requirements of construction and environmental conditions of crosslinking agent with suitable and catalyst, and control the appropriate amount, make the product sulfide in different time. If the choice is undeserved, allocation is not reasonable, may waste all the previous efforts.

According to a certain proportion of the cross-linking agent and catalyst into the glue, glue can be mixed in the material or the original packaging barrel; less dosage can also be mixed in a clean and dry cup or barrel, stirring can meet the requirements by manual or mechanical, but not stirred into a large amount of air, also do not stir too strong accelerating, lead sulfide. Mixing should be carried out after the vacuum degassing, for the parts of perfusion with compact structure needed for vacuum degassing or pressure treatment. Join the crosslinked polymer, crosslinking will gradually thickening, finally cured into a three-dimensional network elastomer. Therefore, to prepare for the construction unit should be before the construction, the rubber material with good as soon as possible after the run out. The user should according to the construction unit depth and area, achieve good measure, a lack of material can be caused by too much waste material. In order to extend the period of use, rubber material can be mixed into the custody of the cooling cabinet.

B. curing at 23 ℃ -30 ℃ temperature curing, standard curing speed can be obtained, increasing the temperature can speed up the curing rate, but not more than 65 DEG C; curing speed and humidity, exposure to high humidity in the air can accelerate the curing rate.

C.Adjust the consistency in order to meet the process requirements, need to the rubber material can be mixed with some thickening, thickening agent (such as silica, calcium carbonate, diatomite, quartz powder and mica powder etc.). High consistency of rubber in general as a putty; when the need to reduce the glue consistency, can join the compatibility of low molar mass of silicone oil or the same structure as the diluent; if the spraying process, sizing available organic solvent dilution, commonly used solvent toluene, two toluene, side chain compound containing a fluoroalkyl needed within ketones diluent.

D. coating cured RTV-2 vulcanization by-product (such as methanol, ethanol, Et2NOH, H2 etc., they need to spread from the inside to escape from the surface of vulcanized rubber. In the deep concern, because the by-products can not be timely release, will affect the internal curing, in order to solve this problem, using hierarchical perfusion method in the process, beneficial by-products promptly left the layer, but the operation is troublesome. If the silica gel by adding a small amount of vulcanization accelerator compounds, such as glycerol phosphate and metal salts, are not hierarchical perfusion.

TypeInfo: Silicone Usage

Keywords for the information:liquid silicone  liquid silicone rubber  liquid silicon 

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