TPE / TPR material (surface) of self-adhesive and co-adhesive problems Material surface precipitation of white material turns out to be

  • Time of issue:2022-04-22
  • Views:943

 TPE / TPR material (surface) of self-adhesive and co-adhesive problems Material surface precipitation of white material turns out to be

  • Categories:Industry News
  • Author:SPP
  • Origin:en.tpe-sp.com
  • Time of issue:2022-04-22
  • Views:943

Conventional TPE, TPR does not have functional viscosity, but needs to be adjusted by blending system to obtain the required adhesion. With the deepening and expansion of TPE and TPR applications, the bonding properties of TPE and TPR (including self-adhesive and co-adhesive) it may be gradually applied to different industries.

  1. self-adhesive of TPE material; it refers to the strong adhesion of TPE material surface, similar to the surface coated with glue. This strong self-adhesive TPE material can be used to stick everyday items and prevent them from falling or tipping over. A similar TPE material has been developed and patented by a foreign TPE manufacturer. In fact, in conventional TPE compounding systems, the viscosity of the TPE material surface can be improved by adding a tackifier that is compatible with the main compounding system. This viscosity is positive and is required and desired by users.

  2. Viscosity of soft TPE material surface. Some low hardness TPE materials have a sticky feeling on the surface of the soft TPE material because of the high content of oil components in the compound. This sticky feeling is caused by the oil in the formulation. Usually SBS-based TPEs (TPRs) are more prone to surface adhesion problems, which are negative and are problems that users want to eliminate.

  3. Adhesion problems during overmolding. As used herein, the term "viscosity" refers to the molten bond between the TPE and the coated substrate (plastic) due to its tight solubility sp or good compatibility on the bonding surface of the two materials when molded at high temperatures. Impact. The quality of the bond depends mainly on the surface affinity of the TPE to the coated plastic (melting point, polarity and surface tension, etc.)

  TPE, TPR co-adhesives, too many applications to list. Most plastics, some non-metallic materials and metals, can be bonded to TPE, TPR by similar co-bonding methods.

  (1) TPE, TPR and plastic co-bonding

  This is the most common type of co-bonding. TPE, TPR and plastic co-bonding, there is a more familiar in the industry called - overmolding, also known as overmolding, overmolding, two-color / multi-color injection molding, etc.. TPE, TPR overmolding applications are ubiquitous in everyday life.

  The cohesive effect of TPE, TPR and plastic depends on the polarity difference of the two materials and the surface tension of the plastic. At present, the industry can provide mature TPE, TPR products with good mutual adhesion (overmolding) with most plastics such as ABS, PA, PC, PP, PS, PCTG, PBT, etc.

  (2) Co-bonding of TPR, TPE and metal and other materials

  TPR and metal co-bonding this formula is not reasonable. Because TPE, TPR and metal bonding overlays, in most cases, not by the true adhesion of the material, but by the use of some special metal structure, or through the structural processing of metal, through injection molding, rapid winding, through physical and mechanical fixation, the composite overlays of two materials, rather than a literal understanding of cooperation. However, it is said that small amounts of metallic materials with high surface chemical activity and TPE materials modified by polarization of functional groups can also be combined at higher temperature conditions. This combination has a degree of robustness and is not merely mechanical. The embedding method is achieved and has a certain degree of cohesiveness.

TPE/TPR materials are modified with SEBS/SBS as the base material, so they contain a variety of components in them!

  I. Additive precipitation

  The molecular weight of additives are generally small, if the amount of additive is too large, choose the wrong type of precipitation.

  For example

  ① antioxidant

  1010 this additive and TPE/TPR material compatibility is relatively general, but the effect is good, if added in too large a quantity there is a great risk of precipitation.

  ②External mold release agent

  For example, the role of erucic acid amide, oleic acid amide itself is to precipitate on the surface of the product to achieve the effect of mold release, if the amount is too large, it is easy to form white spots on the surface.

  ③Dispersant

  If the temperature of TPE/TPR material is too high in the production process, it will lead to the decomposition of PE wax and then precipitation.

  ④Compatibility agent

  The amount of compatibilizer added is too large, which will also lead to precipitation.

  II. Calcium powder and other fillers

  Filler dispersion is not good or contains other substances that lead to precipitation

  Three, flame retardant

  If it is a flame retardant TPE/TPR material, then the flame retardant is not selected reasonably, dispersion and compatibility are not enough will lead to precipitation

  Treatment method.

  1. choose a suitable treatment solution (according to the precipitation of specific substances to choose) wipe or soak TPE / TPR material products, after a period of time in the observation of whether the precipitation, if the precipitation in the repeated treatment, but the general effect is not good, but also easy to lead to defects on the surface of the product, so the formulation of the sample stage should be more experiments, try to avoid this situation!

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