It can slow down the reaction, maintain chemical balance, reduce surface tension, prevent light, thermal decomposition or oxidative decomposition. it mainly includes lead salts, metal soaps, organic tin, organic antimony, organic rare earths, pure organic compounds. Thermal stabilizers commonly used in industry mainly include lead salts, metal soaps, organic tin, organic antimony, organic rare earths, pure organic compounds, etc.
1.1 Organotin Lead Salt Stabilizer, Compound Stabilizer,Pvc Stabilizer,Titanium Dioxide Anatase Henan Shunbang Chemical Industry CO.,Ltd , https://www.sbcpe.com
The old-fashioned national sedan was born in Shanghai in 1963. It was produced by the Shanghai Automobile Manufacturing Factory. For a long time, the Shanghai-brand car was the symbol of the Chinese sedan industry, as was the Hongqi sedan. At that time, the Hongqi sedan was mainly used as the national leader. Cars, and "Shanghai" achieved planned mass production. In 1991, due to production costs and other reasons, the Shanghai sedan began to stop production and made way for Shanghai Volkswagen, a joint venture company. So far, Shanghai brand cars have already withdrawn from the historical stage for 21 years. 
"Shanghai brand car"
Since then, SAIC Motor has launched a new generation of household cars Roewe. At the same time, the industry’s call for the revival of the “Shanghai†brand has never stopped. With the support and attention of the government and the public opinion for independent brands this year, the “Shanghai†brand has ushered in the opportunity for rejuvenation. It is reported that at the Beijing auto show in April this year, SAIC will launch a new generation of Roewe flagship models and adopt the "Shanghai" and "Roewe" dual brand strategy.
In the same announcement, it was also revealed that the "Beijing" brand, a brand with a similar history, was returned. From the first car made in China in 1958 to “Beijing 212†which has been popular in the country for more than 20 years, the history of “Beijing†as a brand has never been interrupted. It is also one of the few auto brands in China that has a history of more than 50 years. Classic brand. 
"Beijing 212"
Compared with the return of the Shanghai sedan, Beijing Auto Group’s Beijing brand car is one step closer to the market. In this announcement, there are 3 models of Beijing brand cars. The previously disclosed BC301 models have been renamed as “Beijing Auto E Series†and have been named as Beijing Auto E150 according to the different displacement of 1.5L and 1.3L engines. And E130, and will be officially listed for sale in March this year. 
"Beiqi BC301"
The cause of the incident is that SAIC and Beijing Automotive Group have owned their own brands and have matured after years of development. Why should these old national brands be launched?
Ten years after China's accession to the WTO, Chinese auto companies have attracted a period of rapid development. The output has increased from 2 million to 18 million, of which the number of self-owned brands exceeds 10 million, surpassing that of the United States and Japan to become the first in the world. Last year, after the cancellation of the government subsidy policy for autonomous vehicles, the self-owned brands achieved a total sales volume of 6,112,200 units for the full year, a year-on-year decrease of 2.56%.
According to senior automotive analysts, this time to recall national brands is to cater to the needs of independent brands and to promote their own brands. It is also the need of manufacturers to maintain their emotions.
Different brand names in the era are limited. However, the analysis of the status quo and prospects, "return plan" is likely to be the manufacturers wishful thinking. Recalling the glory of the old brand comes at a time when domestic materials are poor and economically backward, so as long as we introduce a car of its own output, the country is full of jubilation. Nowadays, the material for reform and opening up is extremely rich and varied, and people’s ideology and concepts have also changed. Not to mention that many foreign brands each occupy the top of the hill, and China’s own internal regional culture is also very complicated. For example, Beijing brand cars, Guangdong or Shanghai people may not buy it. Not conducive to its promotion in the national market. Moreover, the international mainstream car brands are also rarely named after names, and the rare names Fiat and Butyak are not destined to be bankrupt or disappear.
If manufacturers want to rekindle the classics, to wake up the memory and then evoke people's desire to buy, then it is not practical, after all, the current owner and the brand has been separated from the brilliant period of several generations.
The image project is escorted by policies From the Shanghai brand car that appeared in the announcement, the product information of the Ministry of Industry and Information Technology shows that the three listed models of the CSA7200, CSA7300, and CSA7240 are the same as those of the Roewe brand model. This means that the Shanghai brand car will carry out relevant transformations on the technology of the Roewe brand. For SAIC Motor, which already owns two independent brands of Roewe and MG, this “replacement†style return is an imperative and wastes market resources. 
"Roewe 750"
Another news that the sudden resurrection of the Shanghai brand car has been strongly promoted by the Shanghai municipal government. Shanghai brand new products will be positioned in high-end commercial vehicles and administrative vehicles, but not directly into the market. This practice of boosting the local automobile old brands through government procurement is first of all worthy of recognition, but how long can this “special supply†operation last? If the official market is so big, does it really have to wait until it becomes the "standard" for the national official car to see the prosperity of the "Shanghai Card"?
Saying so much is not to sing the classic Chinese car, but it is deeply loved. It is worried that the launch of the old brand will be treated in the market. Neither car owners nor Chinese people are willing to see it. We all hope that these national brands can be recognized by the market and become famous brands in the automotive industry. However, these should be built on excellent quality, good culture, and suitable sales. Let the nation become the world.
(1) Excellent transparency The biggest advantage of organotin stabilizers is that they have excellent transparency. The use of organotin stabilizers in PVC formulations can produce crystalline products. Because of this, organic tin can be used in bottles, containers, corrugated boards, various types of rigid packaging containers, hoses, profiles, films, etc.
(2) Extraordinary thermal stability In terms of thermal stability, there is no other type of thermal stabilizer that can surpass it. Therefore, it is the preferred stabilizer for rigid PVC, and some varieties have better performance in soft products. Suitable for all PVC homopolymers, such as emulsion, suspension and bulk PVC, as well as vinyl chloride copolymers, graft polymers and polymer blends.
(3) The product is non-toxic. Most organotin stabilizers are non-toxic, and the migration of organotin stabilizers in rigid PVC is minimal. Therefore, organotin stabilizers are the preferred heat stabilizers for PVC for food contact.
(4) Good compatibility. Organotin stabilizers have good compatibility with PVC, so there is generally no precipitation on the metal surface, such as lead salt stabilizers and metal soap stabilizer systems.
(5) Poor lubricity Sulfur-containing tin stabilizers have poor self-lubricity. Therefore, many commercially available sulfur-containing organotins are equipped with lubricants to prevent hot melt from adhering to processing equipment during processing.
(6) High cost Compared with other types of stabilizers, the overall performance of organotin stabilizers is closer to the ideal stabilizer. However, all organotin stabilizers, regardless of their structure, have the main disadvantage that their manufacturing cost is much higher than that of lead stabilizers or metal soap compounds. In recent years, by adopting new synthetic technology, or reducing its usage in formulas, its formula cost has been reduced. In the 1970s, foreign countries developed low-priced tin products, which reduced the tin content, which also reduced the price to a certain extent.
1.2 Lead salt
(1) l Excellent stability experiments proved that among the commonly used basic lead salts, the heat resistance of sulfite is better than that of sulfate, and the heat resistance of sulfate is better than that of phosphite. The tribasic lead sulfate, which is widely used in the PVC industry, has a higher effective lead content and shows better thermal stability than other products.
(2) Excellent insulation. Because lead salt is non-ionic and non-conductive, it is inert, which makes lead salt stabilizers widely used in wire and cable industries.
(3) Excellent weather resistance. Many salt compounds can act as white pigments and can show strong covering power, so they have strong weather resistance.
(4) Poor transparency Transparency is a problem related to weather resistance. When used in wires, cables and record materials, there is no need to care about transparency, because most of these products are white or very dark black.
(5) Inexpensive lead salt stabilizer is the lowest price among all stabilizers. Therefore, despite the continuous introduction of new stabilizers, lead salt stabilizers still dominate the stabilizer market after half a century. The composite lead salt introduced to solve the dust and dispersion problem has increased in price, but still maintains a competitive advantage with other types of stabilizers.
(6) The toxicity of the toxic lead salt stabilizer limits its application in many occasions with strict hygiene requirements. For example, many countries have revised the lead content standards in drinking water, and it is no longer possible to use lead salt in PVC water pipes.
(7) Poor dispersibility The dispersibility of salt lead is poor, but the newly launched one-package product is equipped with lubricants, which solves the dispersibility problem to a certain extent. Because of the above characteristics of lead salt stabilizers, they are especially suitable for high-temperature processing. They are widely used in various opaque hard and soft products and cable materials, such as various pipes, plates, indoor and outdoor profiles, foam plastics, artificial leather, and wires. Cables, records, welding rods, etc. The most important lead salt stabilizers are tribasic lead sulfate, dibasic lead phosphite, and dibasic lead stearate.
1.3 Organic antimony
(1) Better stability. The organic antimony stabilizer has basically the same color stability and lower melt viscosity as organotin at the same temperature. In the twin-screw extrusion process, the effect is particularly outstanding when used in combination with calcium stearate. .
(2) The price of organic antimony stabilizer is much lower than that of methyl tin or butyl tin. In addition, the amount of organic antimony used is relatively low, so the use of organic antimony can achieve a better performance/price balance.
(3) The product is non-toxic. In the United States, when a twin-screw extruder is used to manufacture PVC pipes, the PVC water supply pipe manufactured with a formula composed of antimony stabilizers, calcium stearate and other lubricants conforms to the U.S. NSF (National Sanitation Foundation) )Regulation.
(4) Poor transparency and light stability. The transparency of organic antimony compounds is not as good as organotin stabilizers, and it is also lower than the barium/fu and calcium/zinc metal soap system. It is close to lead salts and has poor light stability, so antimony is stable. The agent is mostly used for indoor products without color requirements. The antimony stabilizer itself is also required to be stored in an opaque container.
(5) Poor lubricity. Antimony stabilizers have poor lubricity. Therefore, its use must be combined with a large amount of lubricant without exception.
1.4 Metal soap
(1) The tin soap stabilizer Fu soap is the best type of metal soap. Its advantages are also reflected in the absence of initial coloring, and can produce colorless and transparent products; excellent light stability; it has the effect of preventing precipitation and adhesion. . However, because tin salt is toxic, there are strict regulations on its manufacture and use in the Labor Safety and Health Law. In recent years, the use of Fuzao has shown a downward trend.
(2) Zinc soap stabilizerThe thermal stability of zinc-based stabilizer to PVC is extremely poor. The sample with zinc soap suddenly turns black when heated, that is, the so-called "Zine burning" phenomenon occurs, but it has the following advantages: The initial coloring is excellent; the effect of preventing fouling is good; it can improve the weather resistance; many zinc soaps are recognized as non-toxic stabilizers, so they can be used in non-toxic formulations with calcium soaps.
(3) Barium soap stabilizer Barium compounds have good thermal stability and good lubricity, but the red initial coloration occurs during processing, and it is easy to cause sticking to the roller.
(4) The stability of calcium soap stabilizer is poor, but it is recognized as a non-toxic additive in the world and has excellent lubricity.
(5) Other metal soap stabilizers used in the industry include magnesium stearate, file stearate, aluminum stearate, potassium stearate, etc., among which magnesium stearate is similar to calcium stearate and can be used Materials that are in contact with food; aluminum stearate is similar to zinc stearate, and is approved by the U.S. FDA and the Japanese Vinyl Chloride Food Hygiene Association for food packaging; Stearic Acid files and potassium stearate are also non-toxic products and belong to lead salts , Tin soap and barium soap substitute.
(6) The performance requirements of the composite metal soap stabilizer processing industry for stabilizers are various, and a single metal soap often cannot meet the use requirements, so the use of composite stabilizers has become a trend. A single metal soap compound is rarely used in the PVC industry, and it is usually a compound of several metal soaps. This compound is not a simple addition of properties, but takes advantage of the synergy between the components. The composite metal soap stabilizer generally includes the stabilizer main body (i.e. metal soap), solvent (organic solvent, plasticizer, liquid non-metal stabilizer, etc.), functional additives (auxiliary stabilizer, transparency modifier, light stabilizer, Lubricants, etc.). According to the form, it is divided into solid compound and liquid compound. According to the main component, it can be divided into calcium/zinc compound stabilizer, barium/fu compound stabilizer, barium/zinc compound stabilizer, etc. Among them, the calcium/zinc composite stabilizer has a pivotal role in replacing toxic metals because it is non-toxic.
1.5 Rare earth stabilizer
(1) Excellent thermal stability The thermal stability of rare earth stabilizers is better than traditional lead salt series and barium/zinc, barium/ho/zinc stabilizers. In some applications, rare earth stabilizers can partially or completely replace organotin.
(2) Good transparency. The refractive index of rare earth stabilizers is very close to that of PVC Resin, which can replace traditional organotin and be used in the field of products with higher transparency requirements.
(3) Excellent weather resistance. Rare earth elements can absorb 230-320nm ultraviolet light. Therefore, rare earth stabilizers have anti-photoaging effects and are suitable for outdoor products such as PVC corrugated boards and window materials.
(4) Excellent electrical insulation properties. Some rare earth multifunctional stabilizers can be used to replace lead salt stabilizers in cable material formulations, and their electrical insulation properties are comparable to lead salts.
(5) Non-toxic, safe and hygienic. Rare earth elements are low-toxic elements and have no toxic hazards to the human body in their production, processing, transportation and storage. Rare earth stabilizers are non-toxic products and can be used in food packaging and medical packaging products.
(6) The processing performance is slightly worse. In the case of a large amount of rare earth stabilizer, the roll release of the material is not ideal, and there is a tendency to press out. Generally, better results can be achieved by using stearic acid or calcium stearate in combination.
In summary, rare earth stabilizers can be used for water pipes, injection pipe fittings, window frame profiles, door panels, wire ducts, foam products, artificial leather, cable materials, soft and hard transparent products, food packaging materials, etc.
1.6 Auxiliary stabilizers Auxiliary stabilizers include phosphite, epoxy soybean oil, hindered phenols, etc., which mainly rely on the synergistic effect between metal stabilizers to improve the stabilizing effect, and are generally called co-stabilizers. In addition to compounds such as mesaminocrotonic acid ester, 2-phenyl saccharin, vein derivatives, and diketone can be used in combination with metal stabilizers to improve the effect of metal stabilizers, they also have a certain stabilizing effect. Such compounds are usually called pure organic stabilizers. With the development of PVC stabilizers today, the progress of metal stabilizers is relatively slow, and the research and development of auxiliary stabilizers are unprecedentedly active, which has constituted a major trend in the field of PvC stabilizers. Auxiliary stabilizers are rarely used alone, and are often used in conjunction with primary stabilizers to improve initial coloration or improve long-term stability.
The "Shanghai" and other old cars have a pessimistic outlook on the road to revitalization
Recently, the 233 batch of "Vehicle Production Enterprises and Products" announcement issued by the Ministry of Industry and Information Technology, SAIC Group's Shanghai brand cars and Beijing Automotive Group's Beijing brand cars are impressively listed. The auto market, which has made the situation a bit calm after the year is surging, has once again returned to high-profile domestic traditional brands that once disappeared.