silica fume is often used as a mineral admixture in concrete, but it is also widely used in the materials industry, chemical industry, and rubber industry, but not in the same way. In addition to the above industries, silica fume also has a certain role in the production of sealants. The following Henan Superior Abrasives has compiled a list of the application of silica fume in sealants and the effect of silica fume on the performance of sealants, hoping to help you.
The application of silica fume in sealant
Silica fume in sealant is mainly for partial or full replacement of calcium carbonate, as a modified filler to and use. In the normal sealant production process, every 100 copies of 107 rubber added 60 copies of silica fume, the consistency of the colloid will not change, and even with the addition of silica fume increasing, the performance indicators of sealants and different degrees of improvement, in time to replace all calcium carbonate as filler, the bonding properties of sealants will not decline. Therefore, as a by-product of ferrosilicon smelting, the price and performance of silica fume can basically replace calcium carbonate to prepare sealant.
The performance index of silica fume in sealant
| color | sio2 content | Filling density | PH | 105℃ decrement | burn reduction |
| dark gray | 93.8% | 220g/L | 8.98 | 0.67% | 3.4% |
The impact of silica fume on the performance of sealants
Improve the extrusion performance
As the shape of silica fume after condensation for the size of the ball, and the surface is relatively smooth, some may be two or more ball particles stick together, so it can play a lubricating effect, reduce the internal friction of the rubber, improve the basic performance of the rubber, while indicating that the silica fume in the sealant thixotropy is good.
Change the tensile performance
Through the experiment, we know that the silica fume in the sealant is better than calcium carbonate, and the tensile bond strength of the sealant increases with the addition of silica fume, and the tensile strength increases by 24.4% when it completely replaces calcium carbonate; however, because the particle size distribution of silica fume is wide and contains larger particles, the sealant will cause stress cracking because of the particles, so when the addition of silica fume increases, the elongation at break of the sealant Therefore, the elongation at break of the sealant will decrease when the addition of silica fume increases, so it is recommended that the silica fume particles be graded and then used for sealant.
In addition to the above effects, the experiments also show that even if all the fillers are made of micro silica powder, the damage of the sealant is in the form of cohesion damage, that is, the sealant has good adhesion to the substrate, and the micro silica powder does not lead to a decrease in the adhesion of the sealant, so, in view of the above effects, as long as the particles are graded, the micro silica fume will completely replace calcium carbonate as a sealant filler.
Silica fume from Henan Superior Abrasives Co., Ltd
With more than 20 years in manufacturing micro silica fume, Henan Superior Abrasives Co., Ltd presents itself as your proffered supplier. We supply high-performance silica products from China. Your requirement for densified and undentified silica fume can be fulfilled in different configurations. Share your project needs, and we will provide you with your custom requirement. Our plants in China can furnish different silica fume configurations on request.
Get your silica fume supplied in custom 1000kg plastic woven bags and 10kg and 20 kg soluble paper bags. Plastic woven bags are also available in small supply quantities. Our high-standard materials find their use in different projects all over the world. We stay committed to delivering the best materials with prompt service.
