Anti-aging method for polymer materials

A polymer material and anti-aging technology, applied in the field of polymer material preparation, can solve the problems of high toxicity and unenvironmental protection of antioxidants, and achieve the effect of prolonging service life and improving thermal stability.

Inactive Publication Date: 2011-08-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of relatively high toxicity and non-environmental protection of polymer anti-aging agents in the background

Method used

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  • Anti-aging method for polymer materials
  • Anti-aging method for polymer materials
  • Anti-aging method for polymer materials

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] Ten grams of tea polyphenols and 1000 grams of polypropylene were pelletized by twin-screw extrusion, and then the extruded pellets were subjected to thermogravimetric analysis (heating rate was 5°C / min), and a sample of polypropylene with tea polyphenols The thermogravimetric curve of polypropylene sample under nitrogen protection and air atmosphere is as follows figure 1 with figure 2 Shown.

[0026] As can be seen from the figure, tea polyphenols as a heat stabilizer and thermal oxygen stabilizer have a very significant effect on the anti-aging of polypropylene. After adding tea polyphenols, the thermal stability of polypropylene in nitrogen and air The thermo-oxygen stability of polyphenols has been significantly improved, and its 5% weight loss temperature has increased by about 34°C and 38°C, respectively, indicating that tea polyphenols are very effective heat stabilizers and thermo-oxygen stabilizers for polypropylene.

Example Embodiment

[0027] Example 2:

[0028] The natural rubber is mixed on an open mill according to the formula in Table 1, and then vulcanized on a flat vulcanizer (vulcanization temperature is 143°C). The heat-resistant air aging performance is tested according to the GB / T3512-1983 standard, and the aging temperature is 90°C. , The time is 12 days, 24 days and 48 days. The mechanical properties of formula 1 and formula 2 before and after aging are shown in Table 2. From Table 2, it can be seen that after adding pine bark polyphenol to natural rubber, the aging resistance of natural rubber is significantly improved, indicating that pine bark polyphenol is effective Natural rubber is an effective antioxidant.

[0029] Table 1 Formulation of natural rubber

[0030]

[0031] TMTD*: Tetramethylthiuram disulfide, NOBS**: N-oxydiethylene-2-benzothiazole sulfenamide, 4010NA***: N-isopropyl-N'-phenyl Phenylenediamine

[0032] Table 2 Mechanical properties before and after aging

[0033]

Example Embodiment

[0034] Example 3:

[0035] The polyurethane is mixed uniformly with an internal mixer according to the formula in Table 3, and then the uniformly mixed sample is molded into a 1 mm thick sheet, and then an ultraviolet light artificial accelerated aging box (Z-UV type) is used according to the ASTMG53296 standard. The power is 3.2 kW, the irradiation wavelength range is 280-400 nm, and the temperature is about 70-75 ℃. The tensile strengths of Formulation 1 and Formulation 2 before and after aging are shown in Table 4. It can be seen from Table 4 that after adding tannic acid to polyurethane, the aging resistance is significantly improved, indicating that tannic acid is an effective antioxidant for polyurethane.

[0036] Table 3 Polyurethane formula table

[0037]

[0038] Table 4 Mechanical properties before and after aging

[0039]

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Abstract

The invention discloses an anti-aging method for polymer materials, which is to add plant polyphenol into the polymer materials as a free radicals capturing agent, wherein the plant polyphenol mass content in the polymers is 0.1 to 10 percent. In the invention, the plant polyphenol is added into the polymer materials as the free radicals capturing agent, so the thermal stability, thermal oxygen stability, light stability, light oxygen stability and other aging performances of the polymer materials are improved, and the service lives of the polymer materials are prolonged. The plant polyphenol has the advantages of naturalness, wide source, high efficiency, no toxicity and the like, and can be used by mixing with the polymers in the conventional processing equipment without special process treatment. The invention opens a new field for the application of the plant polyphenol and provides a new anti-aging method for the polymer materials.

Description

technical field [0001] The invention relates to a method for preparing a polymer material, in particular to an anti-aging method for a polymer material. Background technique [0002] Polymer materials have the advantages of light weight, high specific strength, corrosion resistance, good processing performance, excellent insulation performance, and strong designability. Wide range of applications, widely used in various fields such as agriculture, construction, automobile, transportation, electrician and so on. However, compared with other traditional materials such as ceramic materials and metal materials, the performance of polymer materials is easy to change with environmental factors, so the anti-aging of polymer materials is a major problem restricting the application of polymer materials. [0003] Studies have shown that the main factors that cause the aging of polymer materials can be divided into two aspects: internal factors and external factors. Intrinsic factors...

Claims

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Application Information

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IPC IPC(8): C08K5/134C08K5/13C08L23/12C08L7/00C08L75/04C08L9/06
Inventor 杜明亮傅雅琴王瑾
Owner ZHEJIANG SCI-TECH UNIV
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