Reliable PVC Resin Supplier
Chemate – A reliable PVC resin supplier in China can supply various specifications of polyvinyl chloride resin you need, including SG3, SG5, SG7, SG8, S-1000 PVC resin, PVC paste resin, etc. Inquiry us to tell us the grade or the K-value you need, our professional sales staff will reply you quickly and make quotations based on your requirements. Different grades of PVC resin can be used in various different industrial fields. If you have no idea about which grade you need, feel free to tell us the application industry, we will recommend you proper model. As an agent of PVC resin factory, we can guarantee to give our customers the most competitive price.
Technical Specifications of Different PVC Resin grades
|Viscosity No. ml/g||135-127||118-107||95-87||86-73|
|Number of impurity particles||16max||16max||20max||20max|
|Volatile Matter, %||0.3max||0.4max||0.4max||0.4max|
|Apparent Density, g/ml||0.45min||0.48min||0.50min||0.50min|
|Number of Fish Eye (/400 cm2)||20max||20max||30max||30max|
|Plasticizer absorption of 100g resin, g||26min||19min||12min||12min|
|VCM Residue, ppm||5max||5max||5max||5max|
SG3 is for hoses, leathers, wire cables, shoes and other general purpose soft products.
SG5 is for pipes, profile, fittings, panels, injection, moulding, sandals, etc.
SG7/SG8 is for bottles, sheets, calendaring, rigid injection and moulding pipes.
SG5 Typeis always with the K value from 66-68, so if you are looking for PVC resin K66-68. Then SG5 is exactly the model you need. You can check more details and inquiry us for thes best price.
SG8 Type with the K Value of 55-59 is mainly used for bottles, sheets, calendaring, rigid injection and moulding pipes. This model has high apparent density, goof oil absorption and excellent plasticizing properties.
S-1300 type is mainly used in wire and cable, electrical insulating materials, cable sheathing, high-strength film products, soft boards and sheets, auto parts, electrical appliances, etc.
What Is PVC Resin Used for
PVC general soft products. Used for the production of hoses, cables, wires, etc. With various molds, it can be used to make plastic sandals, shoe soles, slippers, toys, auto parts, etc.
PVC films. After the polyvinyl chloride resin is mixed with additives and plasticized, it can be used to make a transparent or colored film with a specified thickness. It can also be used to process packaging bags, raincoats, tablecloths, curtains, inflated toys, etc. The wide transparent film can be used for greenhouses, mulching films. The biaxially stretched film has the characteristics of heat shrinkage and can be used for shrink packaging.
PVC coated products, such as artificial leather. Artificial leather with a backing is made by coating PVC paste resin on cloth or paper, and then plasticizing it at a temperature above 100℃. For artificial leather without a substrate, the PVC emulsion resin is directly rolled into a soft sheet with a certain thickness by a calender, and then pattern is pressed.
PVC foam products. When mixing flexible PVC, add an appropriate amount of foaming agent to make a sheet, and then foamed into foam plastic, which can be used to make foam slippers, sandals, insoles, shock-proof cushioning packaging materials, etc. It can also be used to make low-foam hard PVC boards and profiles, which can replace wood as a new type of construction material.
PVC transparent sheet. Adding impact modifier and organic stabilizer to polyvinyl chloride resin, and then mix, plasticize and calender them to make transparent sheet. The PVC transparent sheet can be made into thin-walled transparent containers or used for vacuum blister packaging, which is an excellent packaging material and decorative material.
PVC pipe and PVC hose. Adding stabilizers, lubricants and fillers to liquid PVC and mixing them. Then use extruder to extrude hard pipes, special-shaped pipes and corrugated pipes of various calibers, which can be used as sewer pipes, drinking water pipes, wire casings or staircase handrails. The calendered sheets can be overlapped and hot pressed to make hard plates of various thickness.
PVC profile. Be used to make hard profiled materials for doors and windows.
Know More About this Chemical
PVC resin, with the full name of polyvinyl chloride resin, is a kind of synthetic plastic polymer with large production volume each year. It is widely used in various plastic industrial fields. Polyvinyl chloride resin is a thermoplastic polymer compound formed by polymerization of vinyl chloride monomer(VCM) or dichloroethane(EDC) under the action of an initiator. Its main components is polyvinyl chloride, and other components are added to enhance its heat resistance, toughness and ductility. With the characteristics of good chemical stability, corrosion resistance and water resistance, polyvinyl chloride is the most widely used raw material in plastic production.
Before PVC Resin can be made into finished products, it always need to be converted into compounds by adding additives, such as, heat stabilizers, UV stabilizers, plasticizers, heat modifiers, flame retardants, bactericides, foaming agents, etc.
PVC suspension resin is a polymer made of vinyl chloride monomer by the production method of suspension polymerization process. The suspension method is the most common method for producing PVC resin, and most of the applied PVC resin for sale in the market are PVC suspension resin.
The production method of PVC suspension resin refers to the polymerization process in which water is use as the suspension medium, liquid vinyl chloride monomer is dispersed into droplets under the action of stirring, and suspended in water to react with PVC particles. The initiator dissolved in the vinyl chloride monomer decomposes into free redicals at the polymerization temperature and initiates the polymerization reaction. The dispersant dissolved in water can protect the adhesion of PVC-VCM swollen particles after the VCM droplets reach a certain conversion rate.
Vinyl chloride is mainly prepared by acetylene method and acetylene oxychlorination method. The purity of VCM used for suspension polymerization method is above 99.9%. Production raw materials are very important to the quality of PVC suspension resin.
According to the production method, it can be divided into general-purpose PVC resin, high polymerization PVC resin, cross bonding polyvinyl chloride resin.
The general-purpose type is formed by the polymerization of vinyl chloride monomer under the action of an initiator.
High polymerization type refers to a resin polymerized by adding a chain extender to the vinyl chloride monomer polymerization system.
The cross bonding type is a resin polymerized by adding a cross-linking agent containing diene and polyene into the vinyl chloride monomer polymerization system.
General-purpose type has a simple preparation method and a wide range of uses. But it has some shortcomings that it can’t be adapted to high-end and special processing applications. The high-polymerization polyvinyl chloride resin generally refers to PVC resin with an average degree of polymerization above 1700 or a slight cross-linked structure between the molecules. This type improves the processing performance of general-purpose polyvinyl chloride resin, and is more suitable for processing special soft products, high resilience, high toughness rubber products, as well as matte products. This type can make the products with the characteristics of higher tensile strength, tear strength, elongation at break, abrasion resistance, high temperature and low temperature resistance, lower compression set, excellent plasticizer retention, etc.
According to the content of plasticizer, it can be divided into rigid PVC and flexible PVC. Without plasticizer, it is rigid PVC, and its glass transition temperature is as high as 80℃-85℃, which is not easy to process. But after adding plasticizer, the glass temperature will decreasse, plasticity and flexibility will in crease and make it easy to process even at low temperature. The rigid type has good tensile, bending, compression and impact resistance, can be used alone as a structural material. The flexibility, elongation at break and cold resistance of the flexible type will increase, but the brittleness, hardness and tensile strength will decrease.
The industry generally distinguishes the PVC resin according to the method of obtaining vinyl chloride monomer. Depends on the polymerization method, PVC suspension resin is currently the largest variety, followed it is the PVC paste resin made by emulsion method.
- It has the characteristics of abundant raw materials, mature manufacturing technology, low price, easy processing and wide application.
- Flame retardancy is its greatest feature, so it is widely used in fire protection applications.
- It has good electrical insulating properties, which makes it can be used as low-frequency insulating material. In addition, its chemical stability is also good.
- It has good mechanical properties, tensile strength is about 60MPa, impact strength is 5 ~ 10kJ/m2.
- The degree of branching is small, the glass transition temperature is 77~90℃, and the decomposition starts at about 170℃.
- The molecular weight of industrially produced PVC powder is generally in the range of 50,000 to 110,000, which has a large dispersibility. The molecular weight increases with the decrease of the polymerization temperature. There is no fixed melting point. The powder starts to soften at 80-85℃, and becomes viscoelastic at 130℃. And it begins to transform into a viscous flow state when the temperature is 160-180℃.
- Its stability to light and heat is poor. If it exceeds 100℃ or is exposed to sunlight for a long time, it will decompose to produce hydrogen chloride, and further autocatalytic decomposition will cause fading. Meanwhile, the physical and mechanical properties will also drop sharply. Stabilizers must be added to improve thermal and light stability in practical applications.
- It can’t be used alone, but can be mixed with other ingredients to produce various products.
According to the raw material, the production methods of polyvinyl chloride are mainly divided into calcium carbide acetylene method, petroleum ethylene method and natural gas acetylene method. The main raw materials commonly used are monomeric vinyl chloride, dispersant, deionized water and initiator.
There are three main methods for the synthesis of vinyl chloride monomer. 1. Ethylene oxychlorination with ethylene method with ethylene as raw material. 2. Synthesis of acetylene and hydrogen chloride from calcium carbide. 3. A method of using dichloroethane as a raw material and then cracking the dichloroethane into vinyl chloride.
Production fundamentals. Using calcium carbide as raw material, through three main chemical reactions of calcium carbide hydrolysis reaction, addition reaction of acetylene and hydrogen chloride, and vinyl chloride polymerization reaction, then the production of PVC resin can be completed. The production device includes reactor, fractionation process, separation process, etc. There are many types of equipment involved, the process control route is long, and the control parameters are more complicated. In actual production, most of them are completed by DCS automatic control.
Quality index of PVC. Many aspects such as raw materials, production process and operation have a great influence on the quality of PVC. Viscosity number, apparent density, oil absorption rate, volatile matter content, sieving rate, number of impurity particles, heat aging whiteness, “fish eye” number, electrical conductivity, residual VCM content are the ten important parameters of general PVC resin powder. In addition to the above indicators, polymerization degree distribution, particle size distribution, particle regularity, initial coloration, aging discoloration rate, dry fluidity, plasticizing rheological properties are all indicators for judging the quality of PVC products.
The K value is an index indicating the polymerization degree and molecular weight of polyvinyl chloride. In addition, the viscosity number is also an indicator of the molecular weight of the polymer. This product is an amorphous linear polymer compound. The larger the relatively molecular weight, the higher the viscosity, the better the strength, stiffness, toughness, heat and low temperature resistance of the material, but the worse the molding processability. The difference in K value of polyvinyl chloride resin will have a certain impact on the processing technology and product performance, Therefore, when purchasing polyvinyl chloride resin, customers need to choose the suitable grade depends on the K value and applications.
K70-75 PVC resin with high K value and higher molecular weight has the best mechanical properties, but is more difficult to process.
PVC resin k65/k66, PVC resin k67/k68 with suitable K value have a good balance between mechanical properties and processability. They are the most popular and can meet the needs of the most PVC applications.
K58-60 polyvinyl chloride with low value has the lowest mechanical properties and the processing is easiest. However, it has many difficulties in the application process.
- From the physical state, polyvinyl chloride paste is in the form of white fine powder, while the PVC resin is in the form of white fine particles.
- In terms of usage method. PVC paste resin should be mixed with appropriate amount of plasticizer and be used in the form of liquid plastisol, which is generally used in the production of flexible plastic products. Polyvinyl chloride resin is used after granulation with an appropriate amount of plasticizer, and is generally used in the production of rigid plastic products.