TPE TPR products are not bright black, simply grasp these 5 points, SBS oil-filled direct injection molding products whitening problem

  • Time of issue:2022-04-22
  • Views:932

TPE TPR products are not bright black, simply grasp these 5 points, SBS oil-filled direct injection molding products whitening problem

  • Categories:Industry News
  • Author:SPP
  • Time of issue:2022-04-22
  • Views:932

  TPR plastic raw material, is a rubber with high elasticity, high strength, high resilience, but also has the characteristics of injection molding process, with environmental protection, non-toxic safety, a wide range of hardness, excellent coloring, some customers' products, because the design needs to be very black, commonly known as bright black, so in the conventional color matching method, you need to do the following 5 points of improvement, you can achieve the purpose.

  1.TPR formula Select SBS base material TPR is better than SEBS base material, because the appearance of SBS base material TPR is glossy, while the appearance of SEBS base material is matte or sub-surface; if the product performance requirements, and must use SEBS base material TPR (TPE), then you can add glossy agent in the TPR formula to improve the effect of glossy.

  2. Mold Polishing the mold will help to get a brighter surface.

  3. Injection temperature Injection temperature should ensure that the TPR material is fully plasticized, the temperature is not enough, the surface of the products may be darker or have a pockmarked surface.

  4. Coloring agent If the color powder or masterbatch is black, the compatibility of the color powder or masterbatch with TPR and the diffusivity of the color powder should be noted, so the choice of the color powder masterbatch (carrier) is very important.

  5. color powder masterbatch additive black powder additive is generally 1~2%, calcium powder filling amount of TPR grades, color powder additive discretion to add.

 Super soft hardness tpe,tpr raw material. Super soft tpe, tpr material is actually sebs, sbs thermoplastic styrene butadiene rubber elastomer mixed with softening oil to get the material. tpe, tpr super soft material can be mixed in sebs, sbs oil and then extracted and cut into transparent granules, and then injection molding or extrusion molding. Also can be processed products before the sebs, sbs raw materials and oil mix, using hot melt glue equipment will be sebs / oil mixing system into a high fluidity liquid material, and then poured into the mold, filled with mold cavity, cooling can be.

Super soft tpe, tpr material hardness is generally in shorea0~15 degrees, or in shorea0 degrees below. Generally, for materials with hardness between shorea0~15 degrees, they can be used for processing products with small size and not very high surface gloss, which can be injection/extrusion molded. For products with softer hardness or larger size, it is more difficult to be discharged and plasticized if injection molding is used. For adult toys products, soft models and other large size super soft hardness products, more use heating|melting|inversion molding process.
 Super soft tpe,tpr raw materials are mostly transparent materials, and can be added according to product requirements such as flavor, color powder, pigment. Super soft tpe,tpr material has high tensile elongation (in about 1000~1500%), using high quality sebs material and softening oil, can be modified to get non-toxic odorless high transparent tpe,tpr soft rubber material. tpe is environmental protection material, does not contain halogen, does not contain nonylphenol np, does not contain polycyclic aromatic hydrocarbon group pahs, does not contain nonylphenol np, does not contain o-phenyl 16p, in line with rohs, reach, en71 environmental standards.

Recently, we received a customer's inquiry that the products produced by injection molding with SBS oil-filled directly have the phenomenon of whitening.

  The company's technical staff went to the customer's company site to see the product, to the customer analysis of two reasons: 1.

  1, direct oil filling is not sufficient, the customer is using a small mixing barrel, and without heating equipment. As a result, SBS did not eat through the oil.

  2, the molding temperature is low, insufficient plasticization.

  It is recommended to use granulated TPR particles for production. We follow the same recipe of the customer and send the sample to the customer after the twin-screw extruder is completely plasticized once, which completely solves the problem.

  Although the cost of direct oil filling can be reduced a little, the effect of the finished product is very different from the pelletized one. We suggest our customers to use the plasticized TPR material to produce as much as possible, which can reduce a lot of subsequent quality problems.

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