2022-05-20
Tire recycled rubber has high content of rubber hydrocarbon, good elasticity, mechanical strength, and can be used with natural rubber, styrene butadiene rubber and other characteristics, is widely used in a variety of rubber products to reduce the cost of raw materials. Some new friends have not used recycled tire rubber, or friends who used ethylene propylene rubber and nitrile rubber for the first time to contact recycled tire rubber, the first problem in the process of use is how to plastication and mixing. Today xiaobian with you to discuss whether the recycled tire rubber needs plasticizing and mixing needs to pay attention to the problem.
First of all, plasticizing, the meaning of plasticizing is to make rubber reach the appropriate plastic degree. If the rubber does not reach the required plastic degree, it will bring great difficulties to the mixing (roll off and other phenomena) the shrinkage rate of rubber increases; If rubber is too plasticized, it will cause the hardness, tensile strength and aging resistance of rubber to decrease. In order to ensure the smooth follow-up process, rubber must be plasticized. General molded rubber products require about 0.3 plasticity, calendering, extrusion, sponge foam materials require about 0.5 plasticity.
Plasticizing is not a necessary part of rubber processing, according to the plasticizing characteristics of rubber raw materials, Mooney viscosity and other comprehensive judgment, Mooney viscosity (ML100℃ 1+4) in the following 80 rubber materials can not be plasticized (except for special uses or properties). Tyre reclaimed rubber Mooney viscosity (ML100 1 + 4 ℃) in the 60 or so commonly, before mixing mixer directly mixed plasticizer, filler, etc., can also be directly mixing mill BoTong after several times of mixing, so most of the tyre reclaimed rubber do not need through the molding process, this is also the tyre reclaimed rubber than natural rubber can reduce the cause of the electricity costs.
Use mixer friend, please take good of vulcanizing agent, promoting agent, stabilizer, zinc oxide, and other products, early added fold encryption refining machine temperature control does not reach the designated position, it doesn't even make gum may have medium or well-done rubber, depending on the mixer time and temperature, equivalent to not vulcanizing press ahead without the vulcanizing process.
The selection and addition of plasticizer is also a lot of novice mistakes, with dibutyl ester, two octyl fat do tire recycled plasticizer, feedback tire recycled adhesive roll is serious, please change into oil, pine tar, tar oil and so on.
Then talk about mixing, recycled tire rubber after adding carbon black, plasticizer, filler after opening the mixer (automatic glue turning machine is slightly different) in the mixing process need to pay attention to the following three points:
1, all kinds of coordination agent should be fully mixed and uniform, strictly roll times and hit the triangle package, otherwise it will cause the glue burning or curing is not ripe.
2. Mixing should be carried out strictly in accordance with the feeding order of the mixing rubber process, and the order can not be changed at will or added all at once.
3. In order to ensure the plasticity of the mixing glue, the mixing time should be strictly controlled.
Do the above points, skilled use of recycled rubber tires to reduce costs has become a very simple thing. If you have encountered plastication or mixing process problems, welcome to leave a message to us to discuss; If you have better plasticizing and mixing methods, please share with me to help more friends reduce costs on the premise of ensuring product quality.