EVA foamed material is a kind of foam material that is made of EVA (ethylene-vinyl acetate copolymer) and low-density polyethylene (LDPE) as raw materials and other additives. It has good flexibility, rubberlike elasticity, good transparency and surface gloss, good chemical stability, anti-aging, and ozone resistance, non-toxic.
Many people think that EVA foam material is the perfect combination of a hard shell and soft shell, However, the use of EVA foamed materials is limited to a certain extent because of its poor aging resistance, flexure resistance, elasticity, and abrasion resistance. The rise of ETPU in recent years and the comparison of samples also make EVA foamed shoes must have lower hardness, higher rebound, low compression deformation, and other new properties and EVA foamed products provided in the market at present are prepared by a chemical foaming method and are mainly used for products such as shoe materials, ground mats, and the like which are in direct contact with human bodies. However, the EVA foaming material prepared by the method and the process has various environmental protection and health problems, and particularly, harmful substances (particularly formamide) are continuously separated from the interior of the product for a long time.
The specific problems are as follows: firstly, the decomposition temperature of a chemical foaming agent is required to be above the temperature at which EVA is close to melting by an EVA chemical foaming process, and the decomposition temperature of the chemical foaming agent is very wide and the decomposition process involves chemical balance, so that the chemical foaming agent still remains in a large amount in a material matrix after foaming is finished, measures of refining the low-temperature EVA in an unmelted state and increasing the addition of a series of auxiliary agents such as a cross-linking agent, stearic acid, a cross-linking initiator, a chemical foaming agent decomposition catalyst, a plasticizer and the like are mainly adopted in the industry for reducing the influence of the residual foaming agent on the foaming performance of the material, but the measures directly cause a large amount of micromolecular auxiliary agents easy to migrate in a final product, and the auxiliary agents continuously migrate to the surface of the product from the inside along with long-time use, so that skin infection or other pollution contacted with the product is caused; secondly, in the chemical foaming process, the decomposition of the chemical blowing agent determining the foaming behavior and the chemical crosslinking determining the melt rheology behavior proceed simultaneously, and the temperature suitable for the decomposition of the chemical blowing agent is not the temperature most suitable for the melt rheology for cell nucleation and growth. In addition, the chemical foaming agent and the chemical crosslinking are dynamic processes that are continuously performed with time, and the temperature dependence is very strong. The process for preparing EVA foam by the chemical foaming method needs to consider crosslinking and foaming at the same time so that the optimization of cell structure is difficult.
In order to solve the above problems, material manufacturers have been actively conducting exploration and study. the combination of EVA foamed material and other elastomer materials has become hot research among shoe manufacturers.
SILIKE Si-TPV thermoplastic elastomer is a dynamic vulcanized thermoplastic silicone-based elastomer made by special compatible technology to help silicone rubber dispersed in EVA evenly as 1~3 micron particles under a microscope. Those unique materials combine the strength, toughness, and abrasion resistance of any thermoplastic elastomer with desirable properties of silicone: softness, silky feel, UV light, and chemical resistance which can be recycled and reused in traditional manufacturing processes.
Why Si-TPV? SILIKE Si-TPV thermoplastic elastomer is a dynamic vulcanized thermoplastic silicone-based elastomer made by special compatible technology to help silicone rubber dispersed in EVA evenly as 1~3 micron particles under a microscope. Those unique materials combine the strength, toughness, and abrasion resistance of any thermoplastic elastomer with desirable properties of silicone: softness, silky feel, UV light, and chemical resistance which can be recycled and reused in traditional manufacturing processes. Si-TPV blended with EVA, achieves a delicate equilibrium between low density, high resilience, excellent wear resistance, and reduced thermal shrinkage, enhancing the color saturation of EVA foam materials, Driving toward comfort, aesthetics, durability, and sustainability.
Novel green environment-friendly Si-TPV modifier empowering the EVA foaming material that reshaped various daily life and business activities products industries. such as footwear, sanitary product, sports leisure products, floor/yoga mats, toys, packaging, medical devices, protective equipment, water non-slip products, and photovoltaic panels...
Si-TPV 2250 series has the characteristics of a long-term skin-friendly soft touch, good stain resistance, no plasticizer and softener added, and no precipitation after long-term use, especially suitably used for Super light high elastic eco-friendly EVA foaming material preparation.
After adding Si-TPV 2250-75A, the bubble cell density of EVA foam gets slightly reduce, bubble wall thickening, and Si-TPV is dispersed in the bubble wall, the bubble wall becomes rough.
Comparison of Si-TPV2250-75A and polyolefin elastomer addition effects in EVA foam
Improve the elasticity of EVA foam materials
Compared with talcum powder or anti-abrasion agent, Si-TPV has better elasticity.
Improve the color saturation of EVA foam materials
Some groups on Si-TPV may interact with dye chromophores, enhancing color saturation.
Decrease the heat shrinkage of EVA foam materials
The elasticity of Si-TPV helps release the internal stress of EVA foam material.
Improve the wear anti-abrasion resistance of EVA foam materials
Si-TPV can participate in the reaction of the cross-linking agent, which increases the crosslinking density.
Si-TPV is uniformly dispersed in the EVA foam material, which can assist cell nucleation.
Decrease the compression deformation of EVA foam materials
Si-TPV has good high and low-temperature resistance performance, and can simultaneously improve the high and low temperature compression deformation of higher hardness EVA foam materials
Environmentally friendly alternatives to PVC & silicone or traditional plastics — Si-TPV series..
When using Si-TPV the design and development of handles for powered and non-powered...
When using Si-TPV the design and development of handles for powered and non-powered tools...
Si-TPVs provide a uniquely smooth feel in hardness ranging from Shore A 35 to 90A making them the ideal material to enhance the aesthetics...
Thermoplastic elastomers (TPEs) are a class of polymeric materials that combine the...