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Product information

BOSIL-OH Polymer

Hydroxyl-terminated polydimethylsiloxane

Empirical formula：OH(CH₃)₂ Si [O(CH₃)₂Si]nOSi (CH₃)₂OH

CAS No.：63148-60-7

Technical data

Note: the above data are for reference only, can not be used as a technical specification

Application and performance

1. RTV silicone rubber  

BOSIL-OH Polymer is mainly used as the base raw material of RTV silicone rubber, all kinds of silicone rubber products made from it are resistant to high and low temperature, oxidation resistance, water resistance, aging resistance, and has excellent electrical insulation, etc.

Widely used in construction, home decoration, electronics, electrical appliances, national defense high-tech fields and other industrial sectors. 

2. The preparation of block polymers and defoaming agent

Low molecular weight BOSIL-OH Polymer is often used in the preparation of block polymers and defoaming agents.   

Widely used in silicone rubber products industry, it is an excellent structure control agent commonly used in silicone rubber processing, which can improve the processing performance of silicone rubber, prolong the storage life of rubber materials, increase the transparency of rubber products,  and improve the mechanical properties of silicone rubber.   

Also used for the preparation of cationic, anionic, non-ionic hydroxyl silicone oil emulsion (hydroxyemulsion), if used with Hydrogen silicone oil, it is a good treatment agent for fabric, leather, paper. 

3.  Softener

After match between BOSIL-OH Polymer and dimethyl hydrosiloxane, can be made into silicone emulsion that used for fabric treatment, forming silicone film covering the surface of the fabric, to make the treated fabric soft hard moderate and has the characteristics of waterproof.  

BOSIL-OH Polymer forms an elastic film on the fabric surface after baking, which is insoluble in lye and has good washing resistance.

The principle of BOSIL-OH Polymer used in fabric treatment: fabric is made of warp and weft yarn interwoven, yarn is made of short fiber twisting or filament and silk. Therefore, the surface friction properties between fibers or yarns will affect their relative movement. After the treatment of BOSIL-OH Polymer, the friction coefficient between fibers and yarns decreases, and the active resistance between interweaving points decreases. The fabric is easy to deform along the direction of hand force, showing softness and smoothness. When the needle is inserted into the yarn, the yarn opens and it is less likely to break, thus greatly improving its sewability. In addition, the reduction of friction coefficient also leads to the reduction of triboelectrification and the improvement of antistatic property. The elastic film formed by BOSIL-OH Polymer can also improve the elasticity of fabric and the deformation recovery of fiber and yarn.

4. As raw materials of special silicone oil   

Amino silicone oil can be synthesized by reaction of BOSIL-OH Polymer and amino silane.  

For example, both LT-602 (N-(β-AMINO ETHYL) -γ-AMINO PROPYL METHYL DIMETHOXY SILANE) and BOSIL-OH Polymer can be polymerized under alkaline conditions.  

The average molecular weight of the product was predicted by means of sampling and viscosity determination. The activation energy of the reaction is low, The reaction was carried out under the moderate condition of temperature > 80℃, need to be drained the reaction products(methanol and water) out of the

system under vacuum conditions. When reacting under atmospheric pressure, it is necessary to extend the reaction time and raise the reaction temperature to about 105℃, If the water in the reaction is not well discharged, it will lead to high viscosity and turbidity of the product, but does not affect the performance.  End-capping reagent can be added to control the viscosity of the product during polymerization, such as BOSIL-999(HEXAMETHYLDISILAZANE), but this will cause the product to lose the hydroxyl group and reduce cross-linking film formation.

BOSIL-OH Polymer can react with polyurethane to produce polysiloxane polyurethanes. Before the reaction, BOSIL-OH Polymer should be pretreatment to dewater to reduced the occurrence of adverse events, the actual reaction conditions can be used more isocyanate curing agent and February silicate tin catalyst mixed first, and then put into the nitrogen to protection, and temperature reaches and keep to 70 ℃   drop BOSIL-OH Polymer for reaction, through testing - the content of NCO group to confirm reaction process during the reaction , when the purity is less than half of volume of addition,after cool down pour out the material, and keep away from light.

BOSIL-OH Polymer and triethanolamine generate amine-modified silicone oil under the action of catalyst. This reaction is a polycondensation reaction between polymers, which is easy to carry out ,meanwhile it can take place at a lower temperature. Catalyst should choose well-dehydration ability of the acid , among which the catalytic effect is phosphoric acid > sulfuric acid > hydrochloric acid.  The reaction solvent uses benzene, at this time the temperature needs to be greater than the boiling point of the solvent, in order to separate, at the same time the temperature can not be too high, otherwise the reaction system is prone to oxidation and become darken in color.

Product safety, handling and storage

Before using the product, carefully read the latest product safety technical information and toxicity data of the product and the correct storage, transportation and use information of the product.

After the container is opened, it shall be sealed to prevent water vapor from entering to produce hydrolysis.

The effective time of the product is indicated on the label. Beyond this time, it does not mean that the product is no longer reusable and can still be used after passing the performance test.