Company Profile
Weifang Phoenix New Material Co., Ltd
Weifang Phoenix New Material Co., Ltd is a high-tech chemical enterprise integrating research and development,
production, sales and technical services. Headquartered in Weifang, Shandong Province. Its production facilities are
ocated in Weifang Binhai Chemical Industry Park, a state-approved chemical industry park.
Our mission is to be the leading sustainable "one-stop shop" chemical solutions company, providing customers
with innovative, science-led, differentiated products and solutions. To this end, we provide a safe and healthy working
environment for our employees and comply with all local, national and international regulations.
Product Parameters
| Parameter |
SG3 |
SG5 |
SG7 |
SG8 |
| Vloatile content incl.water (%≤) |
0.3 |
0.4 |
0.4 |
0.4 |
| Apparent density (≥) |
0.42 |
0.48 |
0.48 |
0.5 |
| Number of Fish Eye 1400cm2 (≤) |
20 |
20 |
30 |
30 |
| Plasticizer absorption of 100g resin(≥) |
26 |
19 |
12 |
22 |
| VCM Residue PPM (≤) |
5 |
5 |
5 |
5 |
| K-Value |
72-71 |
66-68 |
62-60 |
59-55 |
| Polymerizing Index |
1300+/-50 |
1000+/-50 |
800+/-50 |
700+/-50 |
Number of impurty particl
(≤) |
16 |
16 |
20 |
20 |
| Whiteness(160ºC after 10 min)(%≥) |
78 |
78 |
75 |
75 |
PVC - known as "China's No. 1 and the world's second largest general-purpose synthetic resin material", with its excellent flame retardancy, wear resistance, chemical corrosion resistance, as well as excellent comprehensive mechanical properties, product transparency, electrical insulation, and simple processing characteristics, PVC is the leader in the field of plastics. Next, we will conduct a comprehensive and in-depth interpretation of PVC from seven dimensions, including the overview of polyvinyl chloride, development history, type classification, synthesis process, performance modification, application field, and common problems of products.
1. Overview of polyvinyl chloride
Polyvinyl chloride, commonly known as PVC, is a common plastic material. Although I look similar to PE (due to chlorine atoms replacing hydrogen atoms), our sources are very different. I appear in a white powder state, with a mild personality, and can become soft at a temperature of 80-85ºC; when the temperature reaches 130ºC, I will become more active and present a viscoelastic state; once it exceeds 160-180ºC, I will enter a viscous flow state, as touching as pear blossoms with rain.
However, due to the "toxic gene" I was born with - chlorine atoms, my body is relatively fragile. Under the action of light and heat, chlorine atoms are easily replaced, which affects my performance. Therefore, since I was a child, I have needed to undergo a special operation to control the disease, that is, modification.
1. PVC molecular structure and basic properties
Figure: shows the molecular structure of PVC, its structural formula is -(CH2-CHCl)n-, showing a slightly yellow translucent state and a certain luster. This unique molecular structure gives PVC a series of basic physical and chemical properties.
2. The development history of PVC
With the revelation of the molecular structure of PVC, people have a strong interest in its development history. From its birth to its widespread application around the world today, the development history of PVC can be described as magnificent. Next, we will explore the development trajectory of PVC together, understand how it went from the laboratory to the market, and became an indispensable part of our lives.
3. Classification of PVC
In the large family of PVC, different types of PVC have their own unique properties and applications. By changing its molecular structure, we can get several different types of PVC, including general-purpose PVC, high-polymerization PVC and cross-linked PVC. The differences between these PVCs are mainly due to the different initiators and cross-linkers used in the preparation process. Understanding these classifications will help us better select and apply PVC materials.
1. The classification of PVC can be divided into general-purpose PVC resin, high-polymerization PVC resin and cross-linked PVC resin according to its application range. General-purpose PVC is polymerized by vinyl chloride monomer under the action of a specific initiator; high-polymerization PVC is formed by adding a chain extender to increase the degree of polymerization during the polymerization of vinyl chloride monomer; as for cross-linked PVC, a cross-linking agent containing diene and polyene is introduced into the polymerization system to form a resin with a cross-linked structure.
2. Application of PVC in sports products
PVC, a plastic material widely used in many fields, also plays an important role in the field of sports products. Its unique physical and chemical properties make PVC an ideal choice for manufacturing sports products. Whether it is sports shoes, sportswear, or sports equipment, PVC plays an indispensable role. Through exquisite craftsmanship and design, PVC sports products are not only durable and have excellent functionality, but also provide athletes with excellent wearing and sports experience. According to the method of obtaining vinyl chloride monomer, PVC can be divided into two types: calcium carbide method and ethylene method.
3. In addition, PVC can also be classified according to the different plasticizer content. Specifically, PVC plastics are usually divided into the following types: non-plasticized PVC, whose plasticizer content is 0; rigid PVC, whose plasticizer content is less than 10%; semi-rigid PVC, whose plasticizer content is between 10-30%; soft PVC, whose plasticizer content is 30-70%; and polyvinyl chloride paste plastic, whose plasticizer content exceeds 80%.
Application and characteristics of PVC sheets
Among many PVC products, PVC sheets have attracted much attention for their unique properties and wide range of applications. It not only has good processing performance, but also has excellent physical and chemical stability. PVC sheets play an indispensable role in construction, home furnishing, packaging and other fields.
IV. Overview of the synthesis process and manufacturers of PVC sheets
The birth of PVC sheets is not easy, and its synthesis process varies depending on the family background (i.e. production conditions). In resource-scarce environments, such as poor families lacking coal and natural gas, calcium carbide method is usually used for production. This process route requires the collection of raw materials such as calcium carbide, coal and raw salt, but it also brings about greater environmental pollution. In contrast, families with better conditions and sufficient coal and natural gas resources are more inclined to choose the acetylene method for the synthesis of PVC sheets.
PVC preparation process
The production of PVC involves two main preparation processes. First, the calcium carbide method is a commonly used process that mainly relies on raw materials such as calcium carbide, coal and raw salt. On the other hand, the acetylene method uses petroleum as the main raw material. In the international market, the acetylene method is the mainstream method for PVC production. However, in China, due to the limitation of resource endowment - rich coal, poor oil and little gas, the calcium carbide method has become the main production process.
Overview of PVC production bases
The production base of PVC is an important part of industrial production. These bases not only carry the task of converting raw materials into PVC products, but also embody the combination of production efficiency and environmental protection concepts. By understanding the overview of PVC production bases, we can have a deeper understanding of the actual operation of PVC production and the current status of industry development.
Four polymerization methods of PVC
The production of PVC resin mainly relies on four polymerization methods: suspension polymerization, bulk polymerization, emulsion polymerization and solution polymerization. Among them, suspension polymerization is the most commonly used method, accounting for about 80%; bulk polymerization accounts for about 10%; and emulsion polymerization accounts for more than 10%, but the specific figures may vary depending on the region and process. For more detailed information on PVC production methods, you can view the relevant content of the synthesis section of the polyvinyl chloride PVC industry chain.
Main domestic PVC manufacturers and production capacity
In the 2015 China PVC market research report, we found that the demand for general materials showed a downward trend, while high-performance special materials were in short supply. This phenomenon reflects the market's diversified demand for PVC products. In order to meet this demand, a number of PVC manufacturers have emerged in China and formed a corresponding production capacity scale. These manufacturers have not only improved the quality of PVC products, but also responded to market changes and challenges through continuous innovation and optimization of production processes.
V. Modification methods of PVC
Although PVC faces many challenges in the production process, such as sensitivity to light and heat, in order to meet market demand and improve its performance, we have optimized it through a variety of modification methods. These methods include copolymerization, grafting, chlorination, and foaming, which are aimed at enhancing PVC's resistance to light and heat, thereby improving its processing and use performance.
Copolymerization modification: By combining vinyl chloride monomer with other monomers, copolymerization reaction is carried out to optimize the performance of PVC.
Grafting reaction: On the side chain of PVC, we introduced other monomer groups or polymers to carry out grafting reaction, further expanding the performance of PVC.
Chlorination process: Through the aqueous suspension method or gas phase method, we increased the chlorine content of PVC from the original 57% to about 65%. This improvement significantly enhanced the heat resistance of PVC, making its use temperature 35-40°C higher than that of conventional PVC, thus giving birth to chlorinated polyvinyl chloride (CPVC).
Foaming technology: The foaming modification of PVC is divided into hard and soft types. This technology not only reduces the density of PVC and saves costs, but also gives it excellent physical and mechanical properties.
After these modification treatments, the performance of PVC has been significantly improved, and the application field has also been greatly expanded. Whether it is the outer skin of wires, the outer skin of optical fibers, or daily necessities such as shoes, handbags, bags, accessories, or even in the fields of building decoration and furniture making, PVC has shown its unique charm. Although there are some potential risks in the production process, our pursuit of a better world has never stopped.
PVC hard material and sheet market and technology discussion
PVC stone plastic, as a marble-like material, has attracted much attention in the market in recent years. Its unique physical properties and aesthetics make it widely used in many fields. At the same time, with the continuous advancement of technology, the production process of PVC hard materials and sheets is also gradually improving, providing the market with more high-quality product options.
PVC sheet market and technology trends
In recent years, PVC sheets have continued to attract attention in the market. Its excellent physical properties and diverse application scenarios make it the preferred material for many industries. At the same time, with the continuous innovation of production technology, the quality and performance of PVC sheets are also constantly improving, further consolidating its position in the market.
New breakthrough in polyvinyl chloride profiles
Recently, the world's first PVC-PBT door and window profile was launched in July, marking a new and important progress in the field of polyvinyl chloride profiles. This product was launched by BASF. Its unique material combination and excellent performance are expected to bring new changes to the door and window industry.
Application advantages of polyvinyl chloride film
Compared with medical soft PVC and medical TPE packaging bags, polyvinyl chloride film shows unique advantages in the [medical] field.
Application of PVC in the field of general soft products
When PVC products and TPE products compete with each other in the market, PVC has occupied a place in the field of general soft products with its unique properties and advantages.
Unexpectedly, among many medical plastics, PVC hose ranks first.
Main domestic PVC models and uses
From SG1 to SG7, each model has its specific application field. For example, SG1 is mainly used for advanced electrical insulation materials, while SG2 is suitable for the manufacture of electrical insulation materials and films. In addition, SG3, SG4 and SG5 are widely used in many fields, including electrical insulation, agriculture, industry and construction. SG6 and SG7 are mainly used to manufacture transparent products and hard injection molding pipes, etc.
7. Defects and solutions of PVC products
Although PVC products occasionally have some problems, such as yellowing or brittleness, most of these problems can be effectively solved by taking appropriate measures. This is just like when the human body is sick, as long as the right treatment is found and the treatment is adhered to, it will eventually recover. Therefore, for the defects of PVC products, we also need to deeply analyze the causes and seek effective solutions to ensure the continued healthy development of the plastics industry.
Causes and solutions for brittle PVC profiles
The brittleness of PVC plastic profiles is a common problem, and there are many reasons for it. In order to ensure the healthy development of the plastics industry, we must deeply explore these reasons and seek effective solutions. Through scientific methods and appropriate measures, we can significantly improve the brittleness of PVC profiles and improve their service life and performance.
Due to different synthesis processes, PVC can be divided into suspension PVC and emulsion PVC.
According to the national standard GB/T5761-93 "Test Standard for Suspension General Polyvinyl Chloride Resins", suspension PVC is divided into eight types of resins from PVC-SG1 to PVC-SG8.
The smaller the number, the greater the degree of polymerization, the greater the molecular weight, the higher the strength, but the more difficult the melt flow and processing. (SG1 has the highest degree of polymerization, and SG8 has the lowest degree of polymerization).
When making specific choices, when making soft products, PVC-SG1, PVC-SG2, and PVC-SG3 are generally used, and a large amount of plasticizer needs to be added.
For example, SG-2 resin is used for polyvinyl chloride film, and 50 to 80 parts of plasticizer are added. When processing hard products, generally no or very little plasticizer is added, so PVC-SG4, PVC-SG5, PVC-SG6, PVC-SG7, and PVC-SG8 resins are used when making hard products.
For example, PVC hard pipes use SG-4 resin, hard products use SG-5 resin, hard transparent sheets use SG-6 resin, and hard foaming uses SG-7 and SG-8 resins.
Emulsion PVC paste is mainly used for artificial leather, wallpaper, floor leather, and dipped plastic products.
Some PVC resin manufacturers classify their PVC resins according to the degree of polymerization (the degree of polymerization is the number of unit chain links, and the degree of polymerization multiplied by the molecular weight of the chain link equals the molecular weight of the polymer).
For example, the PVC resin produced by Shandong Qilu Petrochemical General Plant has the following products: SK-700; SK-800; SK-1000; SK-1100; SK-1200, etc. The corresponding degree of polymerization of its SG-5 resin is 1000-1100.
Product Description
Polyvinyl chloride (PVC) has a wide range of applications, from building materials to automobile manufacturing, children's toys, from industrial and agricultural products to daily necessities, involving all walks of life and all aspects. For example, it can be used for electrical insulation materials, such as the insulation layer of wires, which has almost completely replaced rubber. It can be used as heat-resistant wires for electrical appliances, bushings for wires and cables, etc.; it can be used as chemical equipment and processed into various chemical-resistant pipes, containers and anti-corrosion materials. Soft polyvinyl chloride can also be made into various tough and flex-resistant pipes, films, sheets and other products, which can be used to make packaging materials, rain gear, agricultural films, etc.
Detailed Photos
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