Natural rubber has high mechanical strength, excellent elasticity and resilience, and can be used to prepare sponge rubber, among which civilian sponge rubber is more common. When natural rubber is used to produce civilian sponge rubber products for different purposes, the variety and amount of various rubber raw materials directly affect the production cost and the performance of the finished product. So what raw and auxiliary materials are commonly used in civilian sponge rubber products that use natural rubber as the main raw material?
1. Rubber raw materials
When natural rubber is used as the main raw material to produce civilian sponge rubber, a certain proportion of general synthetic rubber, recycled rubber or plastic can be mixed. For example, when natural rubber is used to produce microporous sole 2YLYY86, a certain proportion of high styrene, EVA or styrene-butadiene can be added. Rubber, butadiene rubber, etc. Natural rubber can also be mixed with appropriate amount of reclaimed rubber when producing civilian sponge rubber products, mainly latex reclaimed rubber and tire reclaimed rubber, which can effectively reduce the cost of raw materials under the premise of ensuring product quality.
2. Rubber accessories
(1) Vulcanization and foaming
When natural rubber is used to produce civilian sponge rubber, the vulcanization system is generally adjusted to match the foaming speed. In actual production, commonly used foaming agents include foaming agent H, foaming agent AC, etc.; foaming agent H commonly used auxiliary foaming agents include stearic acid, oxalic acid, boric acid, phthalic acid, salicylic acid, etc., foaming Agent AC often uses inorganic substances such as zinc oxide as a foaming agent auxiliary. The vulcanization system generally chooses sulfur-accelerator vulcanization system, the amount of sulfur is controlled 2.0 parts, and the accelerator DM/CZ/TMTD/PZ/D/DM is used in conjunction.
(2) Filling and softening
The requirements of sponge rubber for fillers are low density, good dispersion, will not harden the rubber, can adjust the plasticity and fluidity of the rubber, and help the foaming process of the sponge. When natural rubber is used to produce civil sponge rubber, it is usually filled with semi-reinforcing carbon black with good dispersibility, easy-to-mix channel black, light calcium carbonate, or white carbon black, clay, magnesium carbonate, etc. It is recommended to use several fillers together. Commonly used softeners are organic oil, transformer oil, petrolatum, naphthenic oil, paraffin oil, oxidized paraffin, ointment, organic esters, etc.
(3) Other compounding agents
When using natural rubber to produce light-colored civilian sponge rubber products, it is recommended to use non-polluting antioxidants such as 2246, MB, DOD, etc., and black sponge rubber is commonly used with antioxidants D and 4010. In actual production, stearic acid and paraffin wax can be used in the formulation of natural rubber civilian sponge rubber products as processing aids, and scorch inhibitors can be added in appropriate amounts to prevent scorching. Later, the editor will have the opportunity to continue discussing with you the production techniques of natural rubber to produce civilian sponge products.
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