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Thema: The mechanism and difference of antioxidants 1010, 1076 and 168   Forum: Allgemeines und Offtopic      Beitrag anzeigen
jnforeverchem68    Homepage   jnforeverchem68   

31.03.2022, 05:24
Mitglied seit 03/2022     3 Beiträge
Betreff: The mechanism and difference of antioxidants 1010, 1076 and 168
The effective solution to the yellowing of elastomers is to add antioxidants and ultraviolet absorbers, which can effectively prevent and delay the yellowing. However, there are many kinds of antioxidants, and the selection of suitable products requires certain technical support and experience accumulation.
The main culprit of oxidative yellowing of elastomers is ultraviolet rays, which are mainly from sunlight. Therefore, especially in the face of customers whose products need to be used outdoors, we will recommend adding a certain amount of ultraviolet absorbers to the products. , Can effectively absorb ultraviolet rays and delay yellowing. Moreover, the use of ultraviolet rays and antioxidants together can play a synergistic effect, and the effect of 1 plus 1 is greater than 2.
2. What are the different classifications and mechanisms of antioxidants?
The classification of antioxidants, one is the main antioxidant: capture peroxidative free radicals, mainly hindered phenol antioxidants; the main anti-sterically hindered phenols, antioxidants 1010,belong to this category, by capturing the process of plastic degradation. Generated free radicals and long-term sustained anti-oxidative effect
One is auxiliary antioxidant: decompose hydroperoxides, mainly phosphites and thioesters. Auxiliary anti-phosphites and thiolipids, 168 belongs to phosphite auxiliary anti-oxidants, which can achieve anti-oxidation by decomposing the peroxides generated by the further degradation of plastics, mainly providing thermal processing stability; Anti-co-use can produce synergistic effects (simple analogy: 1+1>2)
In general, according to the production process of each manufacturer, raw materials, solvents, additives, fillers, which stage of yellowing, and the degree of yellowing are different, it is recommended to use different antioxidants.
3. What is the difference between Antioxidant 1010 and 1076?
As a hindered phenolic antioxidant, the effective functional group of 1010 is four times that of 1076, which means high efficacy. The usage mainly considers the compatibility with the resin in the later stage and the processing situation.
1010: Properties: Scientific name [?-(3,5 di-tert-butyl 4-hydroxy-phenyl) propionic acid] pentaerythritol ester. White crystal powder. Melting point 119 ~ 122 ?. No change, no pollution, heat aging, washable, and not volatile. Widely used in thermal processing of polypropylene, polyethylene, polyoxymethylene, ABS resin, etc. Can prolong the service life of plastic products. After preparing methyl 4-hydroxy-3,5-tert-butylphenyl propionate from phenol, it is synthesized with pentabenol in the presence of sodium methoxide catalyst.
1076: Nature: Scientific name ?-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate. White crystal powder. Odorless and non-toxic. Melting point 50 ~ 55 ?. No pollution, no discoloration, low volatility and good thermal stability. Good miscibility with most polymers. Insoluble in water, soluble in many organic solvents. For polypropylene, polyethylene, polystyrene, polyvinyl chloride, ABS resin, polyamide, polyester, etc. It is prepared by esterification with octadecanol after 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid is generated by the action of phenol and isobutylene.
Antioxidant 1010 is a white crystalline powder with stable chemical properties. It can be widely used in general plastics, engineering plastics, synthetic rubber, fibers, hot melt adhesives, resins, oils, inks, coatings and other industries.
Antioxidant 168 is an auxiliary antioxidant, which is compounded with the main antioxidant zm-1010 or 1076, and has a good synergistic effect, which can effectively prevent the thermal degradation of polypropylene and polyethylene in the basic injection molding, and give the polymer additional long-lasting protection.
This product is non-coloring, non-polluting, and has good volatility resistance. For polyethylene, polypropylene, polystyrene, polyester and polyamide and other products. Widely used in polyolefins, styrene monomers and copolymers, elastomers, adhesives, engineering plastics (such as: PE, PP, PVC, PS, polyamide, polycarbonate, ABS) and other polymer materials
Antioxidant 1076 is used together with antioxidants SONOX 168 and DLTDP, which has a significant synergistic effect and can effectively inhibit the thermal degradation and oxidative degradation of polymers. This product is widely used in polyethylene, polypropylene, polyoxymethylene, ABS resin, polystyrene , polyvinyl chloride alcohol, engineering plastics, synthetic rubber and petroleum products, the general dosage is 0.1% to 0.5%.
Thema: The mechanism and difference of antioxidants 1010, 1076 and 168   Forum: Allgemeines und Offtopic      Beitrag anzeigen
jnforeverchem68    Homepage   jnforeverchem68   

31.03.2022, 05:25
Mitglied seit 03/2022     3 Beiträge
Thema: Antioxidants And Their Applications In The Plastics Industry   Forum: Allgemeines und Offtopic      Beitrag anzeigen
jnforeverchem68    Homepage   jnforeverchem68   

27.07.2022, 09:58
Mitglied seit 03/2022     3 Beiträge
Betreff: Antioxidants And Their Applications In The Plastics Industry
Most polymers typically undergo oxidation, leading to degradation of the final product. To improve the quality of the final product, antioxidant plastic additives have been introduced into the plastics manufacturing process. In this article, let's learn how this powerful substance works and how it affects our plastics industry.


Plastic products, although durable and flexible, are always at risk of degradation throughout their life cycle due to a large number of environmental factors (e.g. oxygen, UV light, high temperatures ......). This is why the use of plastic additives plays an integral role in plastics manufacturing, of which antioxidant plastic additives are probably the most familiar name.

I. Antioxidants and their applications in the plastics industry
Antioxidant plastic additives are commonly used to prevent the negative effects of oxidation on plastic products. Oxidation is known to be a common phenomenon in which free radicals react with material molecules, thereby activating chemical chain reactions. This ultimately leads to the degradation of the product itself.

 

In the first stage, it occurs when oxygen is introduced into the molecular structure of the polymer, resulting in chemical chain reactions and permanent changes within the plastic, most typically a reduction in molecular weight. This process is accelerated in thermoforming (blown film, film cast, blow molding ......) and injection molding, which can lead to serious consequences such as degradation of the mechanical properties of the final product. To minimize these negative effects, antioxidant plastic additives must be added to the manufacturing process and used as process stabilizers to prevent oxidative conversion of plastic parts.



When it comes to another stage, the longer stage, antioxidant plastic additives are introduced to protect the final product from harmful environmental factors and to increase its service life. In addition, certain products are more susceptible to oxidation than others, which can be explained primarily by their plastic resins.


In general, plastic products that may contain antioxidant plastic additives include


Pipes and fittings for the construction industry: Since most of them are used outdoors and need to be exposed to external environmental factors for a long time, they are prone to oxidation. Therefore, it is very important to apply antioxidants to these.


Polyethylene (PE) films (used in the construction or food industries): While PE films are not the most affected by oxidation during their life cycle, they are most affected during the manufacturing process. Oxidation is the main factor causing mechanical degradation of PE films. Polypropylene (PP) products: Similarly, PP products also contain antioxidant plastic additives to protect the product from the negative effects of oxidation.

2. Common types of antioxidant plastic additives
As mentioned above, oxidation occurs in both phases of plastic products, which means that the use of antioxidant plastic additives corresponds to this. Basically, there are 3 main categories of such substances to perform specific functions.

 

Primary: This type is mainly used in the final product during its service life to protect itself from oxidation and other harmful environmental factors. Typically, the antioxidant plastic additives in this group are phenolic-based.

Secondary: Secondary antioxidant plastic additives serve as process stabilizers to protect the polymer from degradation due to oxidation during the manufacturing process, especially when the polymer is subjected to multiple thermal processing methods (blown film, injection molding, etc.). Typical chemicals used include phosphite or thioester.

 

Combination of primary and secondary: Not only are primary and secondary antioxidants used individually, they are also used in conjunction with each other to optimize the benefits obtained. In this way, plastic products are protected during processing steps and throughout their life cycle. This means that plastics manufacturers gain a lot of benefits because they provide a high quality output and end users are satisfied with a better lasting end product.

 

Depending on the characteristics of the end product and its use, plastics manufacturers can choose the right type of. For example, packaging products should use antioxidants during the manufacturing process because their oxidation occurs primarily during this process. Outdoor plastic products, on the other hand, should use both primary and secondary antioxidants in the manufacturing process and during their service life.
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