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CN-121975262-A - High-oil-locking food-grade TPE material, and preparation method and application thereof

CN121975262ACN 121975262 ACN121975262 ACN 121975262ACN-121975262-A

Abstract

The application relates to the field of high polymer materials, and particularly discloses a high-lock oil food-grade TPE material, and a preparation method and application thereof. The material comprises a styrene thermoplastic elastomer, white oil, polyolefin, a disperse phase polymer, a compatilizer, a composite oil locking agent, an antioxidant and a lubricant, wherein the composite oil locking agent comprises white carbon black and hydrogenated petroleum hydrocarbon resin in a weight ratio of 1-2:1, and the material does not contain a chemical cross-linking agent. The preparation method comprises the steps of mixing the components, and then carrying out melt extrusion granulation. According to the application, through the complex synergistic effect of the sea-island barrier constructed by the disperse phase polymer, the multiple physical locking network formed by the composite oil locking agent and the elastomer with specific molecular weight, the efficient constraint of white oil is realized on the premise of not using a chemical cross-linking agent, so that the material has excellent high-temperature precipitation resistance, good mechanical property and food-grade safety, and is particularly suitable for products such as beverage bottle cap inner pads and the like which are in direct contact with food.

Inventors

  • PAN WENQIANG
  • TONG XIANTAO
  • KONG XIAOYIN
  • TIAN QIMENG
  • LI SHUN

Assignees

  • 南京京锦元科技实业有限公司

Dates

Publication Date
20260505
Application Date
20260211

Claims (10)

  1. 1. The high-oil-locking food-grade TPE material is characterized by comprising the following components in parts by weight: 25-45 parts of a styrene thermoplastic elastomer; 35-50 parts of white oil; 10-25 parts of polyolefin; 1-5 parts of a disperse phase polymer; 1-5 parts of maleic anhydride grafting compatilizer; 2-7 parts of a composite oil locking agent; 0.2-0.5 part of antioxidant; 0.1-0.4 part of lubricant; the composite oil locking agent is formed by mixing white carbon black and hydrogenated petroleum hydrocarbon resin according to a mass ratio of 1-2:1, and heating and compounding at 200-240 ℃; The TPE material is free of chemical cross-linking agents and is suitable for use in the preparation of articles that directly contact food.
  2. 2. The high oil locking food-grade TPE material according to claim 2, wherein the white carbon black in the composite oil locking agent is a mixture of hydrophilic white carbon black and hydrophobic white carbon black in a weight ratio of 1:0.5-1.5, the specific surface areas of the hydrophilic white carbon black and the hydrophobic white carbon black are respectively 100-400 m2/g, and the softening point of the hydrogenated petroleum hydrocarbon resin is 115-150 ℃.
  3. 3. The high oil locking food grade TPE material according to claim 2, wherein the composite oil locking agent is prepared by the following method: Heating the hydrogenated petroleum hydrocarbon resin to 200-240 ℃, adding the white carbon black after the hydrogenated petroleum hydrocarbon resin is melted into a liquid state, continuously heating and stirring for 20-40min, and carrying out crushing treatment after the materials are completely cooled.
  4. 4. The high lock oil food grade TPE material according to claim 1, wherein the dispersed phase polymer is at least one of nylon or ethylene vinyl alcohol copolymer.
  5. 5. The high lock oil food grade TPE material according to claim 1, wherein the nylon is crystalline nylon or amorphous nylon having a melting point below 250 ℃.
  6. 6. The high lock oil food grade TPE material according to claim 1, wherein the styrenic thermoplastic elastomer is at least one of SEBS, SEPS, SEEPS.
  7. 7. The high lock oil food grade TPE material according to claim 6 wherein the styrenic thermoplastic elastomer is SEBS having a styrene content of 25-35% and comprising high molecular weight SEBS having a molecular weight above 15 ten thousand and low molecular weight SEBS having a molecular weight below 10 ten thousand, wherein the high molecular weight SEBS is more than 60%.
  8. 8. The high lock oil food grade TPE material according to claim 1 wherein the maleic anhydride grafted compatibilizer is selected from any one of maleic anhydride grafted SEBS, maleic anhydride grafted PP, maleic anhydride grafted PE.
  9. 9. A method for preparing the high oil locking food grade TPE material according to any one of claims 1-8, comprising the steps of uniformly mixing the components according to the proportion, and then melt extruding and granulating the components at 180-240 ℃ through a twin screw extruder.
  10. 10. A food contact article made from the high lock oil food grade TPE material according to any one of claims 1-8.

Description

High-oil-locking food-grade TPE material, and preparation method and application thereof Technical Field The application relates to the field of materials, in particular to a high-oil-locking food-grade TPE material, and a preparation method and application thereof. Background Thermoplastic elastomer TPE materials, particularly SEBS-based thermoplastic elastomers (TPE-SEBS), have been widely used in the fields of automobiles, electronics, daily necessities, etc. because they have both rubber elasticity and plastic processing convenience, and are halogen-free and recyclable. In recent years, with the rising environmental and safety awareness, TPE materials have been attracting attention in applications where they directly contact food, such as food packaging, especially beverage bottle cap liners. However, the TPE materials tend to migrate from the matrix to the surface during high temperature or long term use, and "oil out" occurs. In the field of food packaging, particularly in the inner pad material of beverage bottle caps, the precipitation of white oil not only affects the appearance and touch of the material, but also can pollute the content and affect the flavor and safety of the food. This problem is particularly pronounced in summer high temperature or logistic smoldering environments. There are some improvements in the prior art that address the problem of oil development of TPE materials. For example, CN 119161667B discloses a high temperature resistant oil-yielding TPE material, which realizes chemical locking of the filling oil by introducing a cross-linking agent and a cross-linked network surface modifier, and is suitable for electrical products. However, this technique employs a chemical crosslinking system, and the crosslinking agent may decompose during processing or use to produce small molecule residues or off-flavors, which are unsuitable for use with food grade materials, particularly in packaging cushions that directly contact beverages. Therefore, there is a need to develop a high oil locking TPE material that does not require chemical crosslinking, has no odor and residue risk, is particularly suitable for the field of food packaging, and can stably lock oil in a high temperature environment while maintaining good processability and food safety. Disclosure of Invention The TPE elastomer has low hardness, white oil in the material components occupies high proportion, and the TPE elastomer can separate out the white oil to the surface of the material during the process of high temperature in summer and stuffiness environment in the freight process during the shelf life of the beverage, so that the white oil falls into the beverage to influence the quality of the product. In order to solve the problems, the application provides a high-oil-locking food-grade TPE material, and a preparation method and application thereof. The application adopts the following technical scheme: In a first aspect, the application provides a high lock oil food-grade TPE material comprising, by weight: 25-45 parts of a styrene thermoplastic elastomer; 35-50 parts of white oil; 10-25 parts of polyolefin; 1-5 parts of a disperse phase polymer; 1-5 parts of maleic anhydride grafting compatilizer; 2-7 parts of a composite oil locking agent; 0.2-0.5 part of antioxidant; 0.1-0.4 part of lubricant; the composite oil locking agent is formed by mixing white carbon black and hydrogenated petroleum hydrocarbon resin according to a mass ratio of 1-2:1, and heating and compounding at 200-240 ℃; The material is free of chemical cross-linking agents and is suitable for use in the preparation of articles that directly contact food. Further, the composite oil locking agent is prepared by compounding white carbon black and hydrogenated petroleum hydrocarbon resin, and the weight ratio of the white carbon black to the hydrogenated petroleum hydrocarbon resin is 1-2:1. Further, the white carbon black in the composite oil locking agent is a mixture of hydrophilic white carbon black and hydrophobic white carbon black according to the weight ratio of 1:1, the specific surface areas of the hydrophilic white carbon black and the hydrophobic white carbon black are respectively 100-400 m & lt 2 & gt/g, and the softening point of the hydrogenated petroleum hydrocarbon resin is 115-150 ℃. Further, the composite oil locking agent is prepared by the following method: Heating the hydrogenated petroleum hydrocarbon resin to 200-240 ℃, adding the white carbon black after the hydrogenated petroleum hydrocarbon resin is melted into a liquid state, continuously heating and stirring for 20-40min, and carrying out crushing treatment after the materials are completely cooled. Further, the maleic anhydride grafted compatilizer is selected from any one of maleic anhydride grafted SEBS, maleic anhydride grafted PP and maleic anhydride grafted PE. Further, the dispersed phase polymer is at least one of nylon or ethylene-vinyl alcohol copolymer (EVOH). F