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When was plastic invented?
- The plastic is made of monomers as raw materials, polymer by polyaddition or polycondensation polymerization (macromolecules), commonly known as plastic resin (plastics) or (resin), can freely change the composition and form style, composed of synthetic resin and filler, plasticizer, stabilizer, lubricant, pigment and other additives.s
What's the advantage of a basin made of plastic?
- The advantages of the plastic basin: most plastic basins have strong corrosion resistance, not react with acids and bases, low manufacturing cost, durable, waterproof, light quality, good insulation, plastic basin atlas, beautiful and convenients
Plastic products in the injection process should pay attention to what?
- When the material is formed, the molten material contacts the cavity surface and the outer layer is cooled immediately to form a low density solid shell. Because of the poor thermal conductivity of plastic, the inner part of the plastic part is cooled slowly to form a large solid layer with high density. Therefore, the wall thickness, cooling slow, high-density layer thickness is large contraction. In addition, the layout and number of inserts have direct influence on the direction of material flow, the density distribution and the shrinkage resistance. Therefore, the characteristics of plastic parts have great influence on the shrinkage size and direction.s
The concept, classification and distinction of modified plastics and plastic raw materials.
- Classification: modified plastic products are mainly a variety of flame retardant resins, toughening resin, plastic alloy, functional masterbatch etc..s
Plastic shoes taste great, is it harmful?
- But if the smell of plastic shoes is too strong and smells long, there will be smoke and dizziness, which is likely to contain substances harmful to human body.s
Can I marinate salted eggs with a plastic bucket?
- May notA plastic PVC is often used, it is made of PVC resin, plastic resin increasing agent and anti-aging agent, and non-toxic. But the addition of plasticizer, antioxidant and other accessories are toxic, daily in PVC plasticizer, mainly using terephthalic acid two butyl phthalate two formic acid two ester etc., these chemicals are toxic, lead salt antioxidant stearic acid polyvinyl chloride is toxic.s
What are the main raw materials used in plastic products?
- PS plastic (polystyrene) English Name: PolystyreneSpecific gravity: 1.05 g / cubic centimeter molding shrinkage: 0.6-0.8% molding temperature: 170-250 DEG C drying conditions: ---The material properties of electrical insulation (especially high-frequency insulation) excellent, colorless and transparent, light transmittance after organic glass, color of water resistance, good chemical stability and strength. In general, but the crisp, easy to produce stress cracking, no resistance to benzene. Gasoline and other organic solvents. Suitable for making insulating transparent ornament and. Chemical equipment. Optical instruments and other parts.Molding performance 1. amorphous material, moisture absorption is small, not to be fully dry, not easy to break down, but the coefficient of thermal expansion is large, easy to produce internal stress. Better liquidity, can be used screw or plunger injection molding machine2., should use high material temperature, high mold temperature, low injection pressure, extended injection time, is conducive to reducing internal stress, prevent shrinkage, deformation3., can be used in various forms of gate, gate and plastic parts arc connection, so as not to go to the gate when damaged plastic parts. Stripping large slope, top out even. Plastic parts wall thickness uniform, preferably without insert, if inserts should be preheateds
What does Tupperware cup other7 stand for?
- Plastic products recycling logo, made by the relevant institutions of the plastics industry in the United states. The logo will be plastic plastic identification code in the container or packaging, from 1 to 7, so that the public need not bother to learn the similarities and differences of various types of plastic materials, you can simply join the ranks of recycling. Each plastic container has a small identification card - a triangular symbol, usually at the bottom of a plastic container. There are 1~7 numbers in the triangle. Each number represents a plastic container. They are made of different materials, and there are different taboos on using them.s
what is silicone rubber
- Silicone rubber (SiliconeRubber) is a molecular bond properties of both inorganic and organic polymer elastic material, the primary key elements of its silicon atoms and oxygen ato...
what cause noisy water pipes
- Water pipes that make a lot of noise when people run water can be caused by high water pressure, loose mounting straps or even a water hammer. Troubleshooting a water system is an ...
What is the best fertilizer
- The agriculture industry relies heavily on the use of fertilizer. But what is the best fertilizer, and how does it work?Yes,NPK fertilizer is the best fertilizer in many expert'...
How to avoid frozen pipes
- Apply electrically powered heat tape; this will ensure protection against frozen pipes in the coldest weather as long as the utilities are on. Apply the tape in a spiral pattern fo...
What is a rubber tree
- Rubber trees, deciduous trees, have milky sap. It requires average annual rainfall of 1150 to 2500 mm, but rubber trees should not be planted in areas of low humidity. Suitable for...