Natural latex reclaimed rubber processed from waste natural rubber and waste latex products has the characteristics of high strength and good elasticity. It can replace high-priced natural rubber to produce ordinary sponge foam rubber products and effectively reduce the cost of raw materials. When using natural reclaimed rubber to prepare sponge rubber, reasonable selection of rubber raw materials and auxiliary materials can further optimize product quality while reducing costs. So what issues need to be considered when choosing raw and auxiliary materials for latex reclaimed rubber sponge rubber? How to cooperate more appropriately?
1. The basic needs of sponge rubber for rubber
The plasticity of the rubber material directly affects the density, cell structure and size, and foaming rate of the sponge rubber; the Vickers plasticity of the general sponge rubber is controlled above 0.5, and the plasticized raw rubber can obtain a suitable degree of plasticity. The foaming rate of the rubber compound should match the vulcanization rate. The rubber material has good heat transfer properties, so that the inner and outer cells are uniform and the degree of vulcanization is consistent. The pressure generated inside the rubber during foaming should be greater than the external pressure.
2. Tips for selecting latex reclaimed rubber
When using natural latex reclaimed rubber to produce low-cost sponge foamed rubber products, it is recommended to choose latex reclaimed rubber that is close to the various indicators of the foamed product, with suitable plasticity; appropriately increase the amount of reclaimed rubber to reduce the cost of more raw materials 2YLYY128. Considering the color of sponge rubber, it is recommended to use white latex reclaimed rubber or color latex reclaimed rubber of corresponding color for white, light-colored and colored sponge rubber, which is easy to match and does not migrate; when producing dark, black sponge rubber such as shock-absorbing rubber sheets, It is recommended to use black latex reclaimed rubber, the price is lower.
In addition, when using natural reclaimed rubber to produce sponge foam rubber with strict environmental performance requirements, such as indoor sponge rubber sheets, be sure to use environmentally friendly and odorless latex reclaimed rubber certified by the environmental protection directive to effectively avoid irritating odors and harmful substances during use Affect human health.
3. Natural reclaimed rubber sponge foam rubber compounding system
(1) Foaming system: When using natural latex reclaimed rubber to produce sponge foamed rubber products, the foaming agent used is required to have good storage stability, stable to acid, alkali, light, and heat; non-toxic, odorless, and non-toxic after foaming. Pollution, no peculiar smell, no harmful substances; low heat during decomposition; decomposition can be completed in a short time, large air volume and adjustable; uniform particle size, easy to disperse, the particle shape is recommended to be spherical; it can be sufficient in a closed cavity break down.
Latex reclaimed rubber sponge foam rubber mostly uses foaming agent H, combined with salicylic acid, urea, alum, baking soda; or using foaming agent AC, etc.
(2) Vulcanization system: The principle of choosing a sponge foam rubber vulcanization system is to match the vulcanization rate of the rubber compound with the decomposition rate of the foaming agent. Generally speaking, when latex reclaimed rubber or latex reclaimed rubber/natural rubber is used together to prepare sponge rubber, sulfur-accelerator system is often used, and the amount of sulfur is controlled at 1.5-3 parts, with accelerators M, DM, CZ, DZ, TMTD, One or more of PZ and other products, the amount is more than that of solid rubber products.
(3) Filling system: The filler of natural reclaimed rubber sponge foam products generally chooses products with low density and easy to disperse in the rubber. After adding, it will not harden the rubber and can adjust the plasticity and fluidity of the rubber, which is beneficial to Sponge foaming process. In actual production, the filler basically does not affect the decomposition temperature and rate of the foaming agent; the uniform dispersion of filler particles can promote the formation of cell blanks, semi-reinforcing carbon black, easy-mix channel black, and light calcium are all well dispersed Filler.
When using natural latex reclaimed rubber to produce sponge foam rubber products, it is also necessary to strictly control the production process conditions and processes, such as mixing temperature, vulcanization temperature, vulcanization degree, etc. The editor will continue to discuss related issues with you in the later period.
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