Molded sponge rubber material is a sponge rubber material made of rubber as the main raw material and processed by molding molding process, which has the characteristics of good elasticity, light texture, and is not easy to conduct heat, and is widely used in shock absorption, sound insulation, dust prevention and other occasions, and natural rubber is an ideal raw material for the preparation of molded sponge rubber material. However, the price of natural rubber is high and the price fluctuates greatly, so many molded sponge rubber manufacturers have begun to focus on latex reclaimed rubber.
Can natural latex reclaimed rubber be used in the production of molded sponge rubber products? How to design the formula of molded sponge rubber containing latex reclaimed rubber?
1. Selection skills of latex reclaimed rubber for molded sponge rubber material
Latex reclaimed rubber has the basic performance characteristics of natural rubber, high strength, good elasticity and small specific gravity, which can be used alone or combined with natural rubber to prepare molded sponge rubber compound, effectively reducing the cost of raw materials. When using latex reclaimed rubber E4LYY1126 molding sponge rubber to reduce costs, it is necessary to comprehensively consider the color, appearance, physical and mechanical properties of the sponge rubber material. Generally, white and light-colored sponge rubber can be used with white latex reclaimed rubber, which is easy to match and not easy to change color; For dark and black molded sponge rubber, it is recommended to use black latex reclaimed rubber, which is cheaper.
2. Key points of design of vulcanization system for the production of molded sponge rubber in latex reclaimed rubber
When using latex reclaimed rubber to reduce the production cost of molded sponge rubber products, the ordinary sulfur vulcanization system is mostly used, and the dosage is controlled among 2-3.5 parts, so as to improve the cross-linking density of rubber and reduce the shrinkage; Accelerator M, accelerator DM, accelerator TMTD, accelerator CZ, etc. are used with sulfur to improve the matching among vulcanization rate and foaming rate. If you want to improve the heat resistance of latex reclaimed rubber molded sponge compound, you can choose an effective vulcanization system or a peroxide sulfur system.
3. Key points of design of molded sponge rubber foaming system for latex reclaimed rubber production
Rubber foaming agent is divided into two categories: organic foaming agent and inorganic foaming agent, when using latex reclaimed rubber alone or combined with natural rubber to produce molded sponge rubber, the foaming system is recommended to be based on organic foaming agent, such as foaming agent AC, foaming agent H, etc., with a small amount of inorganic foaming agent such as sodium bicarbonate; If necessary, a small amount of urea, stearic acid, etc. can be used as foaming additives to better adjust the decomposition temperature and speed of the foaming agent.
4. Key points of design of molded sponge rubber reinforcement filling system for latex reclaimed rubber production
The requirements of sponge rubber for reinforcing agent and filler are small density and good dispersion, which will not harden the rubber compound, and can adjust the plasticity and fluidity of the rubber compound, which is helpful to the sponge foaming process. It is recommended to use fillers with good dispersion for the production of molded sponge rubber in latex reclaimed rubber, such as semi-reinforcing carbon black, easy-to-mix tank black, light calcium carbonate, etc.; The ointment can be used as a compatibilizer and has a softening effect; When using silica, clay, and magnesium carbonate, it is necessary to pay attention to dispersion.
5. Key points of design of molded sponge rubber softening system for latex reclaimed rubber production
The compounding agent of the rubber softening system can give the rubber plasticity, improve the dispersion of the compounding agent, the processability and formability of the rubber compound, and adjust the hardness of sponge products. When using latex reclaimed rubber to reduce the production cost of molded sponge rubber, commonly used softening plasticizers organic oil, transformer oil, petroleum jelly, naphthenic oil, paraffin oil, chlorinated paraffin, ointment, etc.; Stearic acid can also be used as a softening plasticizer, and is also an active agent and foaming auxiliary.
6. Key points of design of anti-aging system for the production of latex reclaimed rubber molded sponge rubber
When using latex reclaimed rubber to prepare low-cost light-colored molded sponge rubber compounds, choose non-polluting antioxidants, such as antioxidants 2246, MB, etc.; Black molded sponge rubber can be used with antioxidant RD, 4010, etc. As a physical antioxidant, paraffin wax is widely used in molded sponge compounds, and the dosage is larger than that of general product formulas, up to about 5 parts; It should be noted that too much paraffin in the sponge rubber formula will lead to increased shrinkage of the product.
When using latex reclaimed rubber to produce low-cost molded sponge rubber products, it is not only necessary to reasonably design the formula, but also to control the processing technology, such as plastic refining, mixing, rerefining, parking, vulcanization process, etc.; The editor will discuss relevant issues with you in the future.
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