What are the plastic products

Gourmet plastic products is the use of plastic as the main raw material processed from the living supplies, industrial supplies, which has a plasticity of the synthetic polymer materials made. Plastic and synthetic rubber, synthetic fiber to form a daily life indispensable three synthetic materials. Plastic products have penetrated into every aspect of people's lives, and more and more to change people's lives. This topic 51Dongshi net editor for you to explain in detail the knowledge of plastic products. Plastic products how to classify 1, thermosetting plastics

The characteristics of this type of plastic is at a certain temperature, after a certain period of time after heating or adding a curing agent that is curing molding. Cured plastic, hard texture, and insoluble in any solvent, and can not be heated to make it soft again. If the heating temperature is too high, it will decompose. Common thermosetting plastics are: glue wood, electric jade, decorative panels and unsaturated polyester plastics.

2, thermoplastic plastics

This type of plastic is characterized by heat softening, cooling hardening, processing is generally only physical changes and maintain its chemical nature. The resin of this type of plastic is mostly polymerization. Common thermoplastics are: nitrocellulose plastics, acetate plastics, polyethylene plastics, polypropylene plastics, polystyrene plastics, polyvinyl chloride plastics. Such as, our common mineral water bottles, plastic bags and so on. Detailed>>

The meaning of plastic products marking and symbols China with reference to the American Society of Plastics (SPE) put forward and implementation of the material varieties marking the development of the GB/T16288-2008 plastic products sign, the bottom of each plastic utensil has a numerical marking on behalf of its manufacture of the plastic used. So the current market is generally divided into common plastic items 1-7. In China, plastic products labeled with the recycling logo is non-mandatory, some regular big brand companies in order to facilitate the recycling of plastic products, have recently begun to mark the recycling logo.

Plastic products marking is generally a triangle with an arrow mark, which is labeled with the number of 1 to 7. First of all, the "triangle" is a plastic recycling symbol. At present, China adopts the triangle symbol as the plastic recycling symbol. Secondly, there are numbers from 1 to 7 inside the triangle, and each number represents a different material. The scope of application and use of each type of plastic requirements are very different, if less than "05" number, that is, "04" and below or even no number, please do not reuse, or heating, because it will release harmful chemicals and thus carcinogenic. Details>>

Plastic products safety level "1" PET polyester

Scope of application: common mineral water bottles, pure water buckets, bottles of carbonated beverages, etc., heat-resistant to 65 ° C, cold-resistant to -20 ° C, is suitable for bottles of warm drinks or frozen drinks.

"No. 2" HDPE high-density polyethylene

Scope of application: common white medicine bottles, cleaning products, bath products, and so on.

"3" PVC polyvinyl chloride

Scope of application: common raincoats, building materials, plastic film, plastic boxes, etc., the plasticity of this material is excellent, inexpensive, so the use of very common.

"No. 4" LDPE low-density polyethylene

Scope of application: generally also known as PE polyethylene, common plastic wrap, plastic film, and so on.

"No. 5" PP polypropylene

Scope of application: common soybean milk bottles, yogurt bottles, juice drink bottles, microwave oven lunch boxes.

"No. 6" PS polystyrene

Scope of application: common bowls of instant noodle boxes, fast food containers.

"No. 7" PC other plastics

Scope of application: common jugs, cups, bottles, department stores often use this material as a gift cups. Detailed>>

The advantages and disadvantages of plastic products 1, light weight

Plastic is lighter material, relative density distribution between 0.90-2.2. Obviously, can plastic float to the surface? Especially foamed plastics, because of the inner microporous, lighter texture, the relative density of only 0.01. This characteristic makes the plastic can be used in the production of products that require to reduce self-weight.

2, excellent chemical stability

The vast majority of plastics on acid, alkali and other chemicals have good corrosion resistance. Especially commonly known as the king of plastics, polytetrafluoroethylene (F4), its chemical stability is even better than gold, in the "aqua regia" in the boil for more than ten hours will not deteriorate. Because F4 has excellent chemical stability, is the ideal corrosion-resistant materials.

3, excellent electrical insulation properties

Ordinary plastics are bad conductors of electricity, its surface resistance, volume resistance is very large, with the number of up to 109-1018 ohms. Breakdown voltage is large, dielectric loss angle tangent value is very small. Therefore, plastics have a wide range of applications in the electronics industry and mechanical industry. Such as plastic insulated control cables.

4, a poor conductor of heat, with anechoic, shock-absorbing effect

Generally speaking, the thermal conductivity of plastics is relatively low, equivalent to steel 1/75-1/225, the microporous foam contains gas, its thermal insulation, sound insulation, shockproof better. Such as polyvinyl chloride (PVC) thermal conductivity is only 1/357 of steel, aluminum 1/1250. in terms of thermal insulation capacity, single-glazed plastic windows than single-glazed aluminum windows 40% higher, double-glazed 50% higher.

5, mechanical strength distribution and high strength

Some plastics are as hard as stone, steel, some soft as paper, leather; from the hardness of the plastic, tensile strength, elongation and impact strength and other mechanical properties, a wide range of distribution, there is a lot of room for choice. Because the specific gravity of plastic is small, strong, and thus has a high specific strength.

Compared with other materials, plastics also have obvious shortcomings, such as easy to burn, stiffness is not as high as metal, poor aging resistance, not heat-resistant. Detailed>>

How to buy plastic products 1, plastic bottles to buy points

Common plastic bottles are mineral water bottles, carbonated beverage bottles, juice bottles and so on. No matter what raw materials to choose to do plastic bottles, the first must meet the requirements of non-toxic, no odor, etc., and these drinks mainly use PET plastic material polyester bottles. Such bottles are likely to be made of recycled waste if they are not very bright and translucent and the texture is particularly uneven to the touch.

2, plastic tableware purchase points

Plastic tableware is recommended to choose the diamine plastic, it looks and feels like porcelain, acid and alkali resistance, hardness and impact resistance are relatively high, long service life, can be cleaned and disinfected in the dishwasher at 120 ℃ below. You should buy authentic factory-produced diamine tableware from regular stores.

3, plastic bags to buy points

First of all, we must look at the appearance of plastic bags whether there is a "food" logo. Usually this logo should be in the front of the bag, a more conspicuous position; second is to look at the color, generally speaking, the color of colored plastic bags is a kind of fat-soluble, and harmful coloring agent; Finally, to see the plastic bags have no impurities. Plastic bags will be placed in the sun or light, see if there are black spots, there is no mouth. There are impurities in the plastic bag, is certainly the use of waste plastic as raw materials.

4, cling film shopping points

Look at it there is no product description, if the top of the pe cling film or polyethylene cling film, you can rest assured that the use of; if written pvc or not written material, then try not to buy. Polyethylene cling film general viscosity and transparency is poor, easy to open after rubbing the hand, while PVC cling film transparency and viscosity is good, after rubbing the hand is not good to unfold, easy to stick in the hand. Detailed>>

5, plastic toys to buy key points

Buy toys must be selected qualified products, the use of poor quality materials made of plastic toys will be harmful to the baby's health. High-quality plastic toys are usually made of PVC, PP, PE and other plastic raw materials, color and lustre is relatively bright; in addition, you should also look at the toy's 3C certification and labeling instructions. Manufacturer, origin, main material composition, warning labels, product certification and other labeling is also to check. More commonly used plastic products to buy key points >>

How to identify the advantages and disadvantages of plastic products 1, visual

Transparent and colorless goods look good transparency and impurity-free product quality is better (more for the original granule production) such as plastic bags, mouth cups, lunch boxes, food containers of goods.

Transparency is not high or looks like a lot of impurities in the goods for the quality of a little worse (mostly for the production of the original powder) such as organizing boxes, pots, hangers, stools and other goods.

Opaque goods are mostly poor goods (mostly back to the production of materials, but back to the material will be divided into a variety of manufacturers, such as trimming the edge of the back of the material produced by dealers residual returned to the manufacturer of goods) such as garbage cans and garbage can liners, garbage bags of goods.

2, smell

Smell very light, just a light plastic flavor is more for the quality of some of the goods; smell a very strong plastic flavor is more for the quality of slightly poorer commodities; smell a very heavy plastic flavor with a pungent taste is more for the quality of poor goods.

3, tactile

Touch the edges of the goods, nothing tatty feeling, the edge of the cleaner more for the mold is better, the edge of the fly repair is also better; touch very tatty, the edge of the very rough more for the mold is very poor. Detailed>>

What are the hazards of plastic products 1, plastic products with low recycling value of plastic products in the process of use, in addition to scattered in the city streets, tourist areas, bodies of water, highways and railroads on both sides of the pollution caused by "visual pollution" pollution, it is also a potential hazard. Plastic structure is stable, not easy to be degraded by natural microorganisms, in the natural environment for a long time without separation. This means that waste plastic waste, if not recycled, will become pollutants in the environment permanently exist and continue to accumulate, will cause great harm to the environment.

2, affecting the development of agriculture waste plastic products mixed in the soil continues to accumulate, will affect the crops to absorb nutrients and water, resulting in crop yield reduction.

3, on the survival of animals poses a threat to waste plastic products discarded on land or in water bodies, swallowed by animals as food, resulting in animal death. Last year, there are 20 herdsmen in Qinghai Lake **** there are nearly a thousand sheep died as a result, the economic loss of about more than 300,000 yuan. Sheep like to eat plastic products wrapped in oily residue, but often even plastic products eaten together, due to eat plastic for a long time to stay in the stomach is difficult to digest, these sheep's stomach was crowded, no longer able to eat, and finally can only be alive and starve to death. Such things are common in zoos, pastoral areas, rural areas and oceans.

4, occupy land resources waste plastics with landfill will not only occupy a large amount of land, and the occupied land is not restored for a long time, affecting the sustainable use of land. Into the life of the waste plastic products if the landfill, 200 years of time does not degrade. It is extremely harmful to the land, changing its pH, affecting the absorption of nutrients and water by crops, and leading to a reduction in agricultural yields. As for plastic products discarded in water or on land, they not only affect the environment, but also lead to death if they are swallowed passively. This destroys the ecological balance.

5, high temperature decomposition of toxic substances plastic products are not toxic substances, but because of its recycling equipment is not perfect, poor process, and many manufacturers do not have a legal business license, resulting in the reproduction of plastic products at a temperature of 65 ° C, toxic substances will be precipitated and penetrate into the food, it will be on the liver, kidneys, the reproductive system and the central nervous system and other important parts of the body The temperature of the product reaches 65℃, the toxic substances will precipitate and penetrate into the food, which will cause harm to the liver, kidney, reproductive system, central nervous system and other important parts of the human body. Detailed>>

Plastic household goods brand 1, every holiday activities, it is time to online shopping people show their hands, but the face of a variety of goods, uneven prices but do not know how to start?

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