Five plastics for plastic absorption
1. PS plastic
PS plastic (polystyrene)
English name :Polystyrene
Specific gravity :1.05 g/cm3
Molding shrinkage :0.6-0.8%
Mold temperature: 170-250 ℃
The material performance
Excellent electrical insulation (especially high frequency insulation), colorless and transparent, light transmittance second only to that of organic glass.
Good chemical stability, moderate strength,
But the material is brittle, easy to produce stress cracking, not resistant to benzene, gasoline and other organic solvents. Suitable for making transparent insulation.
Decoration and chemical instruments, optical instruments, etc.
1. Amorphous material, with small moisture absorption, does not need to be fully dried, and is not easy to decompose, but with large thermal expansion coefficient, it is easy to generate internal stress.
It can be formed by screw or plunger injection machine.
2. It is advisable to use high material temperature, high mold temperature and low injection pressure, and to extend the injection time is conducive to reducing internal stress and preventing shrinkage and deformation.
3. Various types of gate can be used to connect the gate with the circular arc of the plastic part to avoid damaging the plastic part when removing the gate.
The plastic parts have uniform wall thickness.
It is best not to bring inserts, if there are inserts should be preheated.
2. PVC plastic
English name: Polyvinyl chloride polymer
Density of 1380 kg/m3
Molding shrinkage: 0.2-0.6%
Molding temperature: 185~205C
The combustion characteristics of polyvinyl chloride are: refractory, extinguishing immediately after ignition, yellow flame, white smoke,
When burnt, the plastic softens and gives off the irritating smell of chlorine.
The electrical properties of PVC depend on the amount of residue in the polymer, the type and amount of various additives in the formula.
The electrical properties of PVC are also related to heat exposure:
When heating decomposes PVC, the electric insulation of PVC is reduced due to the presence of chlorine ions.
If a large amount of chloride ions are produced, it cannot be an alkaline stabilizer (such as lead salt).
The neutralization will lead to a significant reduction in its electrical insulation performance.Unlike polyethylene, the electrical properties of PVC vary with frequency and temperature.
For example, the dielectric constant decreases with increasing frequency.
3. APET plastics
APET English full name: Amorphous Polyethylene Terephthalate,
Chemical name: amorphous polyethylene terephthalate,
It's an absorbent material.APET plastic absorbing material PET SHEET is also called polyester hard adhesive cloth.
It is a thermoplastic environment-friendly plastic product.
Its side materials and waste products can be recycled, and its chemical elements are carbon, hydrogen and oxygen like paper, which belongs to degradable plastics.
Packaging products made from this material are discarded and eventually become water and carbon dioxide.
A-pet environment-friendly film is widely used in the packaging of cosmetics, food, electronics, toys, printing and other industries.
Such as all kinds of high - grade blister packaging, folding box, plastic tube, window, etc.Typical applications are thermal shrinkage polyester film.
Physical performance index
Density (G/cm3) 1.33
Colorless transparent and various specified colors
Width (mm) 210-720(+ / - 1.0)
Strength (Mpa) >60
Fracture elongation rate ><200%
Health non - toxic tasteless, consistent with gb9689-88
Light transmittance > 92%
Point defect square meters >
> pieces within the width of the lip line
Dart impact 200gx26 "/0.20mm piece not worn
Roll end flat end face concave <2mm
4. PETG plastic
PETG is a kind of amorphous copolymer polyester
PETG plastic is a kind of transparent plastic, it's an amorphous copolyester,
Excellent thermal forming performance
PETG plate is easy to produce products with complex shape and large tensile ratio.
Moreover, different from PC board and anti-impact modified compressive force,
This kind of plate does not need to be pre-dried before hot forming.
Compared with PC board or compression force, its molding cycle is short, the temperature is low and the yield is higher.
The extruded sheet of PETG is usually 15 to 20 times stronger than the general compressive force, and 5 to 10 times stronger than the compressive force of anti-impact modification.
PETG plate has sufficient bearing capacity in the process of processing, transportation and use, which helps prevent rupture.
PETG panels provide excellent weatherability.It can keep the product tough and prevent yellowing.
It contains ultraviolet absorbent, can squeeze into a protective layer together, protected the plate from the harmful effects of ultraviolet rays.
PETG plates can be cut, die cut, drilled, punched, cut, riveted, milling and cold bending to prevent breakage.
Minor scratches on the surface can be removed with a hot air gun.Solvent bonding is also routine.
It is easier to be processed than general acrylic, anti-impact modified acrylic or PC board, and can be processed by flocking, electroplating, static electricity, etc.
Excellent chemical resistance
PETG boards are resistant to a variety of chemicals and common detergents.
PETG sheet materials are all environment-friendly materials that meet the requirements of food contact management.
It is cheaper than PC board and more durable than acrylic.
5. PP plastic
Polypropylene (PP plastic) is another excellent resin variety developed after nylon.
It is a linear polymer with high density, no side chain and high crystallinity.
Good comprehensive performance.When not colored, it is white, translucent and waxy.
Lighter than polyethylene.Transparency is also better than polyethylene, more rigid than polyethylene.
The proportion of:
1.0 to 2.5%
Material properties density, strength stiffness, hardness and heat resistance are better than that of low pressure polyethylene, which can be used around 100 degrees.
With good electrical performance and high frequency insulation, it is not affected by humidity, but becomes brittle at low temperature.
It is not wear-resistant and easy to age. It is suitable for making general mechanical parts.
Corrosion resistant parts and insulation parts
1. The crystalline material has small moisture absorption, is prone to melt fracture, and is easy to decompose after long-term contact with hot metal.
2. Good fluidity, but large shrinkage range and shrinkage value, prone to shrinkage cavity, indentation and deformation.
3. The cooling speed is fast, and the casting system and cooling system should dissipate heat slowly, and pay attention to controlling the molding temperature.
The directional property of low temperature and high pressure is obvious.
When the temperature of the mould is lower than 50 degrees, the plastic parts are not smooth, which is easy to produce poor welding, leaving marks, and warping deformation over 90 degrees
4. The thickness of the plastic wall shall be even to avoid lack of glue and sharp corners and stress concentration.
It's easy to decompose under certain conditions
Common products: basin, barrel, furniture, film, woven bag, bottle cap, automobile bumper, etc.
Polypropylene also includes a copolymer of propylene and a small amount of ethylene.PP granule material is natural color, cylindrical granule, smooth and clean granule.
The particle size is 2mm ~ 5mm in any direction, no odor, no toxicity, no mechanical impurities.
This product is mainly made of high purity propylene.
Ethylene as comonomer, using highly active catalyst in 62 ℃ ~ 80 ℃ and below 4.0 MPa
Polypropylene powder should be produced in the opposite way through gas under pressure.
After drying, mixing, extrusion, granulation, screening, all into polypropylene particles.
The density is 0.90 g/cm3 ~ 0.91g/cm3,
It is the lightest type of general purpose plastic.Polypropylene resin has excellent mechanical properties and heat resistance.
Use temperature range - 30 ℃ ~ 140 ℃.
At the same time, it has excellent electrical insulation performance and chemical stability, hardly absorbs water, and does not interact with most chemicals.
The product is corrosion resistant, tensile strength 30MPa, strength, rigidity and transparency are better than polyethylene.
The disadvantage is low temperature impact resistance and easy aging.
However, it can be overcome by modification and addition of antioxidant.
And fuming sulfuric acid, fuming nitric acid, chromic acid solution, halogen, benzene, carbon tetrachloride,
Chloroform and other contact have corrosion.It can be used as engineering plastic for making TV sets and radios.
Electrical insulation materials, anti-corrosion pipes, plate materials,
Storage tank, also used to produce flat silk, fiber, packaging film, etc.
6. Flocking plastic
Electrostatic flocking is a new production process by utilizing the natural properties of electric charge
The principle of flocking is to make the villi have negative charge by using the physical properties of charge isotropic attraction.
The villi are attracted to the plant by the heteropotential attraction of the villi under zero or ground conditions.
Accelerated vertical to the surface of the object that needs to be planted, as the plant is coated with adhesive,
The villi are attached vertically to the body of the plant.
Features: strong three-dimensional sense, bright color, soft hand, luxurious and noble, gorgeous and warm,
Vivid image, non-toxic and tasteless, thermal insulation and moisture-proof,
No stripping, friction resistance, smooth and seamless.
All kinds of products can be planted on the surface of the base material, and not limited by the shape and size of the plant body.
Such as: paper, cloth, non-woven cloth, artificial leather, plastic, glass,
Metal, rubber, board, sponge, gypsum board, artificial board, blister film, foam, ceramic, resin and so on.
The field of flocking industry is very broad and representative:
1. Handicraft industry: all kinds of toys, crafts, photo frame backboard, gifts, crafts, calligraphy and paintings,
Artificial flowers, craft plastic lanterns and so on.
2 packaging industry: jewelry box, health care product packaging box, wine box, glasses box, marriage certificate, high-grade certificate skin, wine bottle, bag, adhesive, etc.
Paper cover (board), etc.
3. Automobile industry: automobile rubber sealing strip, automobile interior decoration plastic parts, etc.
4. Other industries: motorcycle helmet, hangers, fire doors, safes, lamps, cabinets, sanitary ware, furniture, sponges, EVA, etc.
Hangers of all kinds of materials.
Resin, ceramics, gypsum, glass, plastic, recycled plastic crafts, toy surface flocking.
.Rely on technological innovation, careful processing and manufacturing.
•.Continuous quality improvement and increase customer satisfaction
•.Achieve customer satisfaction rate of more than 90%
•.The qualified rate of product inspection is more than 99%