1. How can I identify PVC plastics, can PVC be regenerated and granulated?

PVC Chinese name: Polyvinyl chloride. Identification by combustion method, softening or melting temperature range: 75~90 °C; combustion condition: difficult to soften; burning flame state: yellow smoke under green; after fire: extinguished from fire; smell: irritating sour. Solvent treatment identification, solvent: tetrahydrofuran, cyclohexanone, ketone, dimethylformamide; non-solvent: methanol, acetone, heptane. It can be regenerated and granulated. The PVC recycling process mainly includes the following six steps:

(1) Pretreatment of PVC waste

(2) Selective dissolution in a mixed solvent

(3) Separation of insoluble matter

(4) Precipitation of recycled PVC

(5) Drying treatment

(6) Recycling and recycling solvents

2. What is the use of ethylene propylene rubber?

Ethylene-propylene rubber has ternary and binary ethylene-propylene rubber, general purpose: all molded products; general-purpose hose and heat-resistant hose in automobile; manufacturing electrical components; excellent extrusion performance, can be blended with high-viscosity rubber to improve Its extrudability.

3. Which model does LL0412 LL0501 LL0503 LL0504 LL0505 represent?

LL stands for LLDPE; the last four digits represent the delivery time, the first two digits represent the year, and the last two digits represent the month. For example, LL0505 indicates that the symbol is LLDPE, and the delivery month is May 2005. So on and so forth.

4. I want to run a recycled plastic pellet factory, but I don't know what the woven bags belong to, such as PP, aBS, etc.

Generally, PP is used as a woven bag; aBS is rigid and generally used for housings and parts.

5. Which plastic can withstand high temperatures? Can it withstand temperatures of more than 200 degrees?

Teflon can meet the above requirements. In addition, high temperature resistant special engineering plastics include fluoroplastics, silicones, polyetherimides, polyetheretherketones, liquid crystal polymers, and the like. Modified nylon can withstand temperatures above 250 degrees.

6. What is the difference between PS plastic and aBS plastic?

PS plastic (polystyrene), material properties: electrical insulation (especially high frequency insulation) is excellent, colorless and transparent, light transmittance is second only to plexiglass, coloring water resistance, chemical stability, strength, but It is brittle and easy to produce stress cracking and is not resistant to benzene. Organic solvents such as gasoline. Suitable for making insulating transparent parts. Decorative parts and chemical instruments, optical instruments and other parts. Molding performance:

Amorphous material, low moisture absorption, does not need to be fully dried, is not easy to decompose, but has a large coefficient of thermal expansion and is prone to internal stress. Good fluidity, can be formed by screw or plunger injection machine;

It is advisable to use high material temperature, high mold temperature, low injection pressure and prolonged injection time to reduce internal stress and prevent shrinkage and deformation.

Various forms of gates can be used, and the gates are connected to the arc of the plastic part to avoid damage to the plastic parts when the gate is removed. The drafting angle is large and the ejection is uniform. The plastic parts have a uniform wall thickness, preferably without inserts. If there are inserts, they should be preheated.

aBS (acrylonitrile-butadiene-styrene), light yellow granular or bead opaque resin, non-toxic, odorless, low water absorption. It has excellent physical and mechanical properties, excellent low temperature impact resistance, excellent electrical properties, wear resistance, dimensional stability, chemical resistance and dyeability. Easy to shape. aBS is resistant to water, inorganic salts, alkalis and acids, is insoluble in most alcohols and hydrocarbon solvents, and is easily soluble in aldehydes, ketones, esters and certain chlorinated hydrocarbons.

The disadvantage of aBS is that it is flammable, the heat distortion temperature is low, and the weather resistance is poor. Burning characteristics: flammable; continue to burn away from fire; flame yellow, thick black smoke; softening, foaming; acrylonitrile flavor.

Solubility: Soluble solvent: dichloromethane; insoluble solvent: alcohol, aliphatic hydrocarbon, water. Application: automotive industry, mechanical equipment, electronic appliances, etc.

7. What PP material is used for the syringe? Can it be recycled?

The PP material for the syringe is a kind of random copolymer PP which can be recycled. Waste syringes are medical waste, and are used to avoid damage. It is recommended that you do not use the return material because it is easy to cause a medical accident.

8, waste PET use, price, processing technology?

Uses: Recycled pet is mainly used for fiber, sheet, non-food packaging bottles, etc. The development uses include: building materials, food packaging and containers, etc. Japanese companies have used polymer alloy improvement technology to process recycled pet into better performance. Powder coating made from new pet material.

Price: No public quotation was found, which is basically a single discussion.

Treatment process: Teijin Corporation has developed a recycling method for DMT (dimethyl terephthalate) and EG (ethylene glycol) from waste PET bottles. The waste PET bottle is first crushed and washed, and then dissolved in EG. Among them, PET was depolymerized at a boiling temperature of EG and a pressure of 0.1 MPa to form a bishydroxyphthalate (BHET). After filtration, the filter residue and the additive are removed, and BHET is reacted with methanol to form DMT and EG through a transesterification reaction at a boiling temperature of methanol and a pressure of 0.1 MPa. After distillation, the DMT and EG are separated, and then the DMT is refined by a recrystallization process; the EG is purified by distillation, and the methanol can be recycled. The purity of the recovered DMT and EG is 99.99%, and the production cost is comparable to the cost of the general DMT and EG methods. DMT can be converted to pure TPA (terephthalic acid) for the manufacture of bottle grade PET resins. The recycling device can produce about 10% of the raw materials used by the company to produce resins.

9. How is waste plastic classified?

Commonly used waste plastics are generally divided into PE, PP, PVC, PET, EPS, aBS, Pa, etc.; PE has plastic greenhouse materials, industrial packaging film, lactic acid beverage bottles, detergent bottles, etc.; PP has woven bags, packaging Belts, tying ropes, some car bumpers, PVC, plastic door and window profiles, pipes, etc.; PET has cola, sprite and other tea beverage bottles; EPS is commonly known as foam.

10. What is the chemical name of waste plastics and what kind of plastic products can be made from various waste plastics? For example: What can a mineral water bottle do after it is made into pellets? Its chemical name? What can I do after the woven bag is made into granules?

After the thermoplastic finished product is recycled, it can be regranulated, called recycled plastic. In theory, its use is slightly narrower than the new material. Because of the special nature of recycling technology and finished products: such as food packaging, medical treatment, etc. (to avoid harm to the human body, generally such products do not use recycled materials). However, the advanced recycling technology and strict recycling system in developed countries have made the performance of recycled materials close to new materials, and even through this, synthesis, etc., new uses can be developed. Domestic technology is lagging behind, and so far, recycled plastic pellets have not yet introduced corporate standards or national standards. Therefore, the quality of plastic recycled materials is uneven, and its use depends on its specific technical indicators.

11. What is the detailed use of PTFE?

Polytetrafluoroethylene (PTFE), commonly known as plastic king, is the largest variety of fluorine plastics in terms of output and dosage, accounting for about 70% of the total production of fluoroplastics. It is used in many fields such as chemical, machinery, electrical, construction, electronics, and automobiles.

12. What is the relevant information of PPR?

PPR pipe products are suitable for industrial and civil building life, sanitary drinking water supply and hot water heating system. It is an upgraded product that replaces copper pipe and galvanized pipe. It can be used for: 1. residential hot and cold water system; 2. clean water, Pure water pipeline; 3, industrial water and chemical substance transportation and discharge; 4, hot water circulation system; 5, compressed air tube; 6, food and beverage production and transportation system; 7, other industrial and agricultural tubes.

13. What is the plastic used for the spring?

Main requirements for spring plastic performance: 1. The deformation energy V value should be large (that is, the spring modulus E value should be small); 2. The strength, especially the fatigue strength should be large; 3. The easy processing and forming thermosetting fiber reinforced plastic (FRP) The deformation energy V value is larger than that of the general metal, and can be compared with the spring steel; and its strength is high, and the stress is unidirectionally distributed, which is an ideal material for manufacturing the leaf spring.

14, the main purpose of aBS.PS.PP.PE and other materials and the difference between the various labels

aBS has good rigidity, high impact strength, heat resistance, low temperature resistance, chemical resistance, mechanical strength and electrical properties, easy processing, good dimensional stability and surface gloss, easy coating, coloring, and metal spraying. Secondary processing properties such as plating, welding and bonding.

Main applications: automotive, appliance, electronics/electrical appliances, building materials, aBS alloy/blend PS, electrical insulation (especially high-frequency insulation), colorless and transparent, light transmittance is second only to plexiglass, coloring and water resistance, Good chemical stability, general strength, but brittle, easy to produce stress cracking, not resistant to organic solvents such as benzene and gasoline. Suitable for making insulating transparent parts, decorative parts and chemical instruments, optical instruments and other parts.

PE is basically divided into three categories, namely high pressure low density polyethylene (LDPE), high density polyethylene (HDPE) and linear low density polyethylene (LLDPE). Film is the main processed product, followed by hollow containers such as sheets and coatings, bottles, cans, barrels, and other various injection and blow molding products, pipes and wires, and insulation and sheathing of cables. Mainly used in packaging, agriculture and transportation sectors.

Pp is cheap, light, good processability and versatile. The development of catalysts and new processes further promotes the expansion of the application field. Some people say: "As long as one product is replaced by plastic, then this product has polypropylene. potential". Main uses: woven bags, tarpaulins, durable consumer goods: such as cars, home appliances and carpets.

15. What kinds of PC commonly used products are there, and what plastics are VCD discs and outer packaging boxes?

Polycarbonate (PC) materials have the advantages of light weight, transparency, high strength, seismic resistance and good processing performance. In the course of more than 50 years of development, the application fields have been continuously expanded. The application of PC products has penetrated into the automotive, construction, medicine, clothing and other industries, PC lights, PC car sunroofs, optical waveguide fibers in automotive communication systems, transparent ceilings, PC sheets, PC injection tubes, In addition, the self-illumination system at the bottom of the swimming pool, the solar energy collection system, the high-definition large-scale TV screen, the chip marking fiber for textile material identification in textiles, and other new fields are all indispensable for PC materials. PC products are being used for various walks of life. The industry will contribute and its application potential will be further developed. The optical disc is the most familiar PC application field, and it is moving toward large capacity. The storage capacity of the new DVD is expected to reach 100 billion bytes.

16, PC performance

High impact strength, good dimensional stability, colorless and transparent, good coloring, good electrical insulation, corrosion resistance and wear resistance, but poor lubricity, stress cracking tendency, high temperature easy hydrolysis, poor compatibility with other resins .

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