| 摘要 |
<p>By preparing a one part silicone RTV composition with a high initial uncured plasticity, specifically a Williams plasticity of from 80 to 900mm, formulations can be prepared that are easy and convenient for consumers to mould into a variety of shapes, which, once moulded, will hold their shape exactly during cure without slump or flow. Preferred formulations for a non-adhesive composition comprise: 20-60% by weight of a hydroxyl-terminated polydimethylsiloxane of viscosity greater than 350, 000 mPa s; 3-66% by weight of a reinforcing filler such as fumed silica; (optionally treated with a silane such as hexamethyldisilazane or dimethyldichlorosilane; 10-60% by weight of a non-reinforcing filler such as magnesium silicate (talc); 2-6% by weight crosslinker; and a quantity of curing catalyst. Preferred self-adhesive materials should also comprise 1-5% by weight of a suitable adhesion promoter. The composition is intended to be used to customise parts on products for comfort, safety, fun etc such as forming hand grips.</p> |
