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CN-122011453-A - Low-temperature thermoplastic film and production method thereof

CN122011453ACN 122011453 ACN122011453 ACN 122011453ACN-122011453-A

Abstract

The invention belongs to the technical field of thermoplastic films. The invention provides a low-temperature thermoplastic film and a production method thereof, wherein the method comprises the steps of S1, mixing 100 parts of polyvinyl chloride resin, 11.7-12.2 parts of di-n-octyl phthalate, 3.5-4 parts of epoxy triglyceride, 8.5-9 parts of stabilizer, 1.2-1.5 parts of thiosalicylic acid modified chlorinated paraffin and 1.5-1.8 parts of ethylene bis-stearamide uniformly according to parts by weight, S2, putting the mixture obtained in S1 into a double-screw extruder, extruding and granulating to obtain granules, S3, putting the granules obtained in S2 into an injection molding machine, and performing injection molding to obtain the low-temperature thermoplastic film. The invention further improves the tensile strength of the low-temperature thermoplastic film by increasing the addition amount of the epoxy triglyceride while reducing the softening temperature of the low-temperature thermoplastic film.

Inventors

  • LIAO MINYUE
  • HUA LONG

Assignees

  • 杭州煜诺医疗科技有限公司

Dates

Publication Date
20260512
Application Date
20260312

Claims (9)

  1. 1. The production method of the low-temperature thermoplastic film is characterized by comprising the following steps of: s1, uniformly mixing 100 parts of polyvinyl chloride resin, 11.7-12.2 parts of di-n-octyl phthalate, 3.5-4 parts of epoxy triglyceride, 8.5-9 parts of stabilizer, 1.2-1.5 parts of thiosalicylic acid modified chlorinated paraffin and 1.5-1.8 parts of ethylene bis-stearamide according to parts by weight to obtain a mixture; s2, putting the mixture obtained in the step S1 into a double-screw extruder, and extruding and granulating to obtain granules; S3, putting the granules obtained in the step S2 into an injection molding machine, and performing injection molding to obtain the low-temperature thermoplastic film.
  2. 2. The method for producing a low-temperature thermoplastic film according to claim 1, wherein the method for producing the thiosalicylic acid-modified chlorinated paraffin is as follows: A1, adding 480-510 parts of acetone and 50 parts of chlorinated paraffin into a reactor according to parts by weight, stirring and dissolving, adding 37-42 parts of thiosalicylic acid and 42-45 parts of potassium carbonate, and reacting under the protection of inert gas to obtain a reactant; A2, extracting the reactant obtained in the step A1 by using ethanol, and then carrying out vacuum drying to obtain an extraction material; and A3, pouring the extract obtained in the step A2 into tetrahydrofuran, adjusting the pH value to 4-4.2, pouring into ethanol for extraction, and then drying in vacuum to obtain the finished product.
  3. 3. The method for producing a low-temperature thermoplastic film according to claim 2, wherein in A1, the reaction temperature is 50±2 ℃ and the reaction time is 12 to 13 hours.
  4. 4. The method for producing a low-temperature thermoplastic film according to claim 2, wherein in both A2 and A3, the drying temperature is 100±2 ℃ and the drying time is 2 to 2.5 hours.
  5. 5. The method for producing a low-temperature thermoplastic film according to claim 2, wherein in A3, the pH is adjusted with hydrochloric acid.
  6. 6. The method of producing a low temperature thermoplastic film according to claim 1, wherein in S1, the stabilizer comprises a complex lead salt, stearic acid, zinc stearate and calcium stearate, and the mass ratio of the four is (4.5-5) 1:1 (1.5-2).
  7. 7. The method for producing a low-temperature thermoplastic film according to claim 1, wherein in S2, the pellets are extruded at a temperature of 140 to 145 ℃.
  8. 8. The method for producing a low temperature thermoplastic film according to claim 1, wherein in S3, injection molding is performed at a temperature of 140 to 145 ℃.
  9. 9. A low temperature thermoplastic film produced by the production method according to any one of claims 1 to 8.

Description

Low-temperature thermoplastic film and production method thereof Technical Field The invention belongs to the technical field of thermoplastic films, and particularly relates to a low-temperature thermoplastic film and a production method thereof. Background In the past, gypsum fixing materials have been widely used in clinical treatment scenes such as fracture, orthopedics, and the like because of their certain shaping ability and relatively simple use modes. However, with the continuous progress of technology and the intensive medical research, it has been gradually found that gypsum fixing materials have some limitations such as heavy weight, poor air permeability, etc. In this context, polymer fixing materials have been developed and, by virtue of their numerous advantages, gradually replaced traditional gypsum fixing materials, becoming a more common choice in the clinic. Among the polymer fixing materials, low-temperature thermoplastic polymer resin materials have emerged as important materials in various clinical environments due to their excellent properties. The low-temperature thermoplastic polymer resin material has good plasticity, can become soft and easy to shape at relatively low temperature, and can be accurately molded into a required shape by medical staff according to the specific illness state and body part characteristics of a patient, so that stable and fitting support is provided for fracture or parts needing to be corrected. In addition to applications in the fields of fracture and orthopedics, low temperature thermoplastic polymer resin materials have also shown unique value in radiotherapy. Radiation therapy, which is a common and important means of treating tumors at present, often encounters a troublesome problem during actual treatment, namely that the target area of radiation therapy has different shapes. The radiotherapy target zone presents various forms due to the different tumor positions, sizes and physical conditions of different patients. This requires a fixed mold that can be customized to the specific target shape during radiation therapy to ensure the accuracy and effectiveness of radiation therapy. The use of low-temperature thermoplastic polymer resin materials such as polyvinyl chloride thermoplastic films can manufacture a fixing die, so that patients can be fixed and the accuracy of radiotherapy is improved. In the prior art, polyvinyl chloride resin is used as a main material, plasticizer di-n-octyl phthalate and epoxy triglyceride are added, a stabilizer is also added, and the low-temperature thermoplastic film is prepared after a thermoplastic molding process. According to the actual situation, the addition amount of the epoxy triglyceride can be increased in order to reduce the softening temperature of the prepared low-temperature thermoplastic film, and the softening temperature of the prepared low-temperature thermoplastic film is continuously reduced along with the increase of the addition amount of the epoxy triglyceride, but at the same time, the tensile strength of the prepared low-temperature thermoplastic film is reduced. Disclosure of Invention In order to solve the problems in the background art, the invention provides a low-temperature thermoplastic film and a production method thereof, and the tensile strength of the low-temperature thermoplastic film is further improved while the softening temperature of the prepared low-temperature thermoplastic film is reduced by increasing the addition amount of epoxy triglyceride. In order to achieve the above object, in a first aspect, the present invention provides a method for producing a low-temperature thermoplastic film, comprising the steps of: s1, uniformly mixing 100 parts of polyvinyl chloride resin, 11.7-12.2 parts of di-n-octyl phthalate, 3.5-4 parts of epoxy triglyceride, 8.5-9 parts of stabilizer, 1.2-1.5 parts of thiosalicylic acid modified chlorinated paraffin and 1.5-1.8 parts of ethylene bis-stearamide according to parts by weight to obtain a mixture; s2, putting the mixture obtained in the step S1 into a double-screw extruder, and extruding and granulating to obtain granules; S3, putting the granules obtained in the step S2 into an injection molding machine, and performing injection molding to obtain the low-temperature thermoplastic film. Further, the preparation method of the thiosalicylic acid modified chlorinated paraffin comprises the following steps: A1, adding 480-510 parts of acetone and 50 parts of chlorinated paraffin into a reactor according to parts by weight, stirring and dissolving, adding 37-42 parts of thiosalicylic acid and 42-45 parts of potassium carbonate, and reacting under the protection of inert gas to obtain a reactant; A2, extracting the reactant obtained in the step A1 by using ethanol, and then carrying out vacuum drying to obtain an extraction material; and A3, pouring the extract obtained in the step A2 into tetrahydrofuran, adjusting the pH value to 4-4.2, pour