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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 technology, the purpose of the present invention is to provide a safe and environmentally friendly anti-aging method for polymer materials

Method used

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  • Anti-aging method for polymer materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 10 grams of tea polyphenols and 1000 grams of polypropylene were extruded and granulated by twin-screw, and then the extruded pellets were subjected to thermogravimetric analysis (the heating rate was 5°C / min). The thermogravimetric curves of polypropylene samples in nitrogen protection and air atmosphere are as follows: figure 1 and figure 2 shown.

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

Embodiment 2

[0028] The natural rubber is mixed on the open mill according to the formula in Table 1, and then vulcanized on a flat vulcanizer (the vulcanization temperature is 143°C). The aging resistance to hot air 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 respectively. The mechanical properties of formula 1 and formula 2 before and after aging are shown in Table 2 below. It can be seen from Table 2 that after adding pine bark polyphenols to natural rubber, the aging resistance of natural rubber is significantly improved. Natural rubber is an efficient anti-aging agent.

[0029] Table 1 Natural rubber formula table

[0030]

[0031] TMTD*: Tetramethylthiuram disulfide, NOBS**: N-oxydiethylene-2-benzothiazolesulfenamide, 4010NA***: N-isopropyl-N'-phenylpara phenylenediamine

[0032] Table 2 Mechanical properties before and after aging

[0033]

Embodiment 3

[0035]The polyurethane was mixed uniformly with an internal mixer according to the formula in Table 3, and then the uniformly mixed sample was molded into a thin sheet with a thickness of 1 mm, and then the artificial accelerated aging box (Z-UV type) was used to carry out according to ASTM G53296 standard, and irradiated 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 efficient 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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