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by：CSSSLD
2021-01-23
When a synthetic material or material under the condition of the isolated from air or oxygen, life than when exposed to air or oxygen environment of longer service life.
Injection molding processing, for example, LDPE can occur even at room temperature in air quite serious aging, but if isolated from the air, decomposition temperature to 290 ℃ above will start.
Investigate its reason is polymer materials and oxygen oxidizing reaction and promote the aging process.
factors affecting plastic aging has two aspects, namely, internal factors and external factors. Intrinsic factor is also known as structural factors. Because in the polymer structure is always there are some weak links of different level, and they tend to be the first by the effect of external factors caused by aging. Such as the chemical stability of PTFE plastic is better than all the others, aging resistance and good performance. Due to the C - F key is very strong, the other atoms or groups are hard to replace fluorine atoms, relatively weak C - at the same time C key has been shielding effect from the effect of external factors and damage.
stabilizing agent is a kind of join can delay the ageing of polymer compounds. Generally have heat stabilizer, antioxidant and light stabilizer and mould, etc. Causes ageing of polymer is the root cause of the structure of the polymer itself, and under certain conditions, the external factors will have an extremely important role on ageing of polymer. Plastic oxygen aging refers to the aerobic, automatic oxidation reaction of polymer molecular chain.
and PTEF structure similar to that of PE is easy ageing. In addition to the C - Than C - H key F key weak, PE and some molecular chain of the existence of branched chain, thus forming a certain number of tertiary carbon atom of a lively. In addition, also contain carbon - PE molecular chain Carbon double bond and oxidation structure, all of these make PE vulnerable to external effects caused by aging. PP due to contain more tertiary carbon atoms, ageing resistance less than PE. Relative molecular mass and the size of the regularity of the structure, crystallization and crystallization etc. Is all have certain effect on aging.
polymer structural factors have led to the cause of aging, and aging, an actual was conducted under the action of outside factors, external factors are the important condition of plastic ageing. External factors including physical factors, chemical factors and biological factors. Physical factors including light, heat, electricity, mechanical stress and high-energy radiation, including light and heat is the main factor. Chemical factors including oxygen, ozone, water, acid, alkali, salt and corrosive gas, etc. , in which oxygen is the main factor, many plastic under the action of light, heat, oxidation reaction happens automatically, so that the macromolecular chain was broken chain or crosslinking, and lead to ageing. Biological factors including microorganisms, insects, Marine biology, etc.
plastic ageing phenomenon refers to the plastic performance under the condition of exposure to natural or artificial environment extended gradually deteriorate over time. Due to the various plastic materials, storage and use conditions and is not the same, so their aging phenomenon is various. Aging is plastic and all common polymer materials. Just due to the chemical composition and structure of the polymer, processing conditions and using the environment is different, the aging speed is different.
aging is from two aspects of internal and external causes of polymer structure, the effect of corresponding anti aging way has two aspects: one is by improving the polymerization process, or to the molecular structure of polymer was modified to eliminate or reduce as far as possible in the weak links, and even impose physical protection, isolated from the outside factors on the role of the polymer. The second is to add stabilizing additives. From the point of view of injection molding processing, add stabilizing additives has the characteristics of simple operation, obvious effect, thus has more realistic significance.
more excellent articles: aliphatic dibasic acid esters, click directly.
http://www。 csssld。 cn//html/2018/Info_0107/721。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
factors affecting plastic aging has two aspects, namely, internal factors and external factors. Intrinsic factor is also known as structural factors. Because in the polymer structure is always there are some weak links of different level, and they tend to be the first by the effect of external factors caused by aging. Such as the chemical stability of PTFE plastic is better than all the others, aging resistance and good performance. Due to the C - F key is very strong, the other atoms or groups are hard to replace fluorine atoms, relatively weak C - at the same time C key has been shielding effect from the effect of external factors and damage.
stabilizing agent is a kind of join can delay the ageing of polymer compounds. Generally have heat stabilizer, antioxidant and light stabilizer and mould, etc. Causes ageing of polymer is the root cause of the structure of the polymer itself, and under certain conditions, the external factors will have an extremely important role on ageing of polymer. Plastic oxygen aging refers to the aerobic, automatic oxidation reaction of polymer molecular chain.
and PTEF structure similar to that of PE is easy ageing. In addition to the C - Than C - H key F key weak, PE and some molecular chain of the existence of branched chain, thus forming a certain number of tertiary carbon atom of a lively. In addition, also contain carbon - PE molecular chain Carbon double bond and oxidation structure, all of these make PE vulnerable to external effects caused by aging. PP due to contain more tertiary carbon atoms, ageing resistance less than PE. Relative molecular mass and the size of the regularity of the structure, crystallization and crystallization etc. Is all have certain effect on aging.
polymer structural factors have led to the cause of aging, and aging, an actual was conducted under the action of outside factors, external factors are the important condition of plastic ageing. External factors including physical factors, chemical factors and biological factors. Physical factors including light, heat, electricity, mechanical stress and high-energy radiation, including light and heat is the main factor. Chemical factors including oxygen, ozone, water, acid, alkali, salt and corrosive gas, etc. , in which oxygen is the main factor, many plastic under the action of light, heat, oxidation reaction happens automatically, so that the macromolecular chain was broken chain or crosslinking, and lead to ageing. Biological factors including microorganisms, insects, Marine biology, etc.
plastic ageing phenomenon refers to the plastic performance under the condition of exposure to natural or artificial environment extended gradually deteriorate over time. Due to the various plastic materials, storage and use conditions and is not the same, so their aging phenomenon is various. Aging is plastic and all common polymer materials. Just due to the chemical composition and structure of the polymer, processing conditions and using the environment is different, the aging speed is different.
aging is from two aspects of internal and external causes of polymer structure, the effect of corresponding anti aging way has two aspects: one is by improving the polymerization process, or to the molecular structure of polymer was modified to eliminate or reduce as far as possible in the weak links, and even impose physical protection, isolated from the outside factors on the role of the polymer. The second is to add stabilizing additives. From the point of view of injection molding processing, add stabilizing additives has the characteristics of simple operation, obvious effect, thus has more realistic significance.
more excellent articles: aliphatic dibasic acid esters, click directly.
http://www。 csssld。 cn//html/2018/Info_0107/721。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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