The nitrile rubber foam sealant produced with nitrile rubber as the main raw material has excellent oil resistance, soft texture, good elasticity and resilience, waterproof and shock absorption, etc., and is widely used in automobiles, industry, construction and other fields. However, the price of nitrile rubber is high, and it is difficult to win in the market where more and more nitrile rubber is used to produce foam sealant strips, and it is imperative to use reclaimed rubber to replace part of nitrile rubber.
1. Which reclaimed rubber can be used in combination with nitrile rubber to produce foam sealing strips
(1) Nitrile reclaimed rubber
Nitrile recycled rubber is made of waste nitrile rubber products such as waste nitrile gloves and nitrile rubber rollers as raw materials, with the basic performance characteristics of nitrile rubber, excellent oil resistance, the higher the acrylonitrile content, the greater the oil resistance coefficient of nitrile reclaimed rubber, the price is much lower than that of nitrile rubber, and it is an ideal raw material to replace nitrile rubber to produce oil-resistant foam sealing strips. Nitrile reclaimed rubber and nitrile rubber can be used in any proportion to produce nitrile rubber sponge foam sealing strips, effectively reducing the cost of raw materials.
(2) Neoprene reclaimed rubber
Neoprene reclaimed rubber is processed from waste rubber products with high neoprene content as raw materials, which has good weather resistance, ozone resistance, oil resistance and adhesive performance, and good compatibility with nitrile rubber, and can be used with nitrile rubber and nitrile reclaimed rubber to produce sponge foam sealing strips, effectively reducing the cost of raw materials. When producing foam sealing strips with neoprene reclaimed rubber and nitrile rubber, the proportion of neoprene reclaimed rubber is controlled among 10% and 30%, and attention should be paid to the compatibility of nitrile rubber vulcanization system.
(3) Latex reclaimed rubber
Latex reclaimed rubber is processed from waste natural rubber, waste latex and its products as raw materials, and has the characteristics of good elasticity, high strength, small specific gravity, and high elongation at break; Nitrile rubber foam sealing strip mixed with a small amount of natural latex reclaimed rubber can improve the comfort and flexibility of the sealing strip, and the mixing ratio is generally not more than 20%. When using latex reclaimed rubber to reduce the production cost of nitrile sponge foam sealing strips, it is recommended to use white latex reclaimed rubber for light-colored sealing strips, which is easy to match colors and not easy to change color; Black styrofoam strip chooses black natural reclaimed rubber, which is cheaper.
(4) Tire reclaimed rubber
The tire reclaimed rubber processed from waste tire rubber powder has the performance characteristics of high tensile strength, good elasticity, wear resistance, tear resistance, etc., with a wide source of raw materials and low product price. Using nitrile rubber as the main raw material to produce sponge foam sealant strips, an appropriate amount of tire reclaimed rubber is mixed in the formula, which can effectively reduce the cost of raw materials.
2. Nitrile rubber foam sealant strip with reclaimed rubber selection skills
When using reclaimed rubber in nitrile rubber foam sealant strip to reduce costs, it is first necessary to choose the appropriate reclaimed rubber variety according to the use occasion and performance requirements of the sealant, such as the nitrile reclaimed rubber E4LYY1227 with high acrylonitrile content that has strict requirements for oil resistance, and natural latex reclaimed rubber can be used when the elasticity requirements are high; Choose high-fineness, impurity-free reclaimed rubber to ensure that the foaming strip foams evenly and smoothly extruded, such as Hongyun ultra-fine tire reclaimed rubber; There are requirements for environmental performance, and the selection of environmentally friendly reclaimed rubber and so on.
When choosing reclaimed rubber, it is recommended that the manufacturer of nitrile rubber sponge sealant directly cooperate with a regular reclaimed rubber factory of a certain scale, with sufficient inventory and stable quality.
3. Nitrile rubber and reclaimed rubber are used together to produce foam sealing strip vulcanization formula
80 parts of nitrile rubber, 20 parts of nitrile reclaimed rubber, 5 parts of zinc oxide, 1.8 parts of stearic acid, 1 part of antioxidant RD, 32 parts of carbon black N550, 12 parts of dibutyl phthalate, 15 parts of liquid nitrile rubber, 5 parts of titanium dioxide, 1.3 parts of accelerator DM, 0.2 parts of accelerator TMTM, 2 parts of sulfur, 8 parts of foaming agent H, 4 parts of foaming agent TSH; Total 187.3 copies.
Under the fierce market competition, rubber products manufacturers need to strictly control production costs; When using reclaimed rubber to reduce the production cost of nitrile rubber foam sealing strip, it is not only necessary to select the appropriate reclaimed rubber according to the actual needs and reasonably control the mixing ratio of reclaimed rubber, but also to appropriately adjust the production process parameters, especially the mixing and vulcanization process, and will continue to discuss related issues with you in the future.
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