Softening plasticizers are essential when using recycled rubber to produce rubber products. Rubber softening plasticizer is mainly used to improve the processing performance of rubber materials, including reducing the viscosity and softness of rubber materials, facilitating process operations such as mixing, calendering, and extrusion molding, and can also adjust the hardness of rubber materials. In actual production, the compatibility of different varieties of softeners and recycled rubber is different, and recycled rubber products need to follow the principle of similar miscibility when choosing softeners.
1.Choose skills for softeners for latex recycled rubber products
Latex recycled rubber is made of waste natural rubber, waste latex and its products processed by crushing, desulfurization, filtration and other processes, and the molecular structure and performance characteristics are similar to those of natural rubber. Therefore, the commonly used softening plasticizers for latex recycled rubberE5LYY813 products are basically the same as those for natural rubber products, and the commonly used softeners are pine tar and petroleum-based softeners, and the plasticizers are SJ-103 and 12-I.
2. Tire recycled rubber product softener choose skills
Tire recycled rubber is processed from waste tire rubber powder as raw material, the main components are natural rubber, synthetic rubber (styrene-butadiene rubber, butadiene rubber, etc.) and carbon black, and the commonly used softeners are petroleum softeners, coumarone resin, petroleum resin, aromatic oil, pine tar, etc.
3. Nitrile recycled rubber product softener choose skills
The main raw materials of nitrile recycled rubber are sub-brand nitrile rubber, waste nitrile gloves, oil seals, etc., which have the basic performance characteristics of nitrile rubber. When using nitrile recycled rubber or nitrile rubber/nitrile recycled rubber to produce rubber products, plasticizers should be used to improve the processing process performance of the rubber material. The commonly used plasticizers for nitrile recycled rubber products include dibutyl phthalate (DBP), dioctyl phthalate (DOP), and xylene phosphate (TCP), which can not only plasticize the rubber material, but also improve the elasticity and wear resistance of the rubber material.
Nitrile recycled rubber products can also use coumalon resin to improve the viscosity of the adhesive, liquid nitrile and polyester plasticizers can prevent extraction, and dioctyl sebacrate and dioctyl adipate have excellent cold resistance; Nitrile recycled rubber can use 5-20 parts of paste to produce extruded products, and the rubber material has small shrinkage and smooth surface.
4. Choose skills of EPDM recycled rubber products softener
EPDM recycled rubber is processed from EPDM head rubber, unvulcanized EPDM or waste EPDM rubber products as raw materials, which retains the molecular chain structure of EPDM rubber and is an ideal raw material to replace EPDM raw rubber to produce EPDM products. When using EPDM recycled rubber to produce rubber products, the commonly used softeners are basically the same as EPDM raw rubber, including aromatic oil, naphthenic oil and paraffin oil, of which paraffin oil is the most suitable. Coumarone resins, pine tar, esters and low molecular weight polymers can also be used.
5. Butyl recycled rubber product softener choose skills
Butyl recycled rubber is processed from waste inner tubes as raw materials, with good air tightness, water tightness, heat resistance and chemical corrosion resistance, and can generally be used alone or in combination with butyl rubber to produce high-air tightness rubber products and corrosion-resistant products. The commonly used softening plasticizers for butyl recycled rubber products are petroleum (paraffin oil, paraffin) and polyester plasticizers.
(1) Add paraffin oil to reduce tensile strength, constant tensile stress and hardness, and increase elongation. (2) Adding paraffin oil, Mooney's viscosity decreased, and Mooney's scorching time increased. (3) Add paraffin oil to improve the extrusion performance to a certain extent. (4) Add paraffin oil to reduce ozone resistance, compression permanent deformation resistance, and heat resistance. (5) The low-temperature performance is improved by adding ester plasticizers, but the effect varies depending on the type of oil. (6) Add ester plasticizers to reduce compression set resistance and heat resistance.
Rubber softeners and plasticizers are a type of important chemical additives in the formulation of recycled rubber products, and the rational use of softeners can not only improve the performance of rubber processing technology, but also reduce production costs, and continue to discuss related issues with you in the later stage.
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