Outdoors in winter, plastic raincoats resemble hard paper shells, and plastic soles squeak hard. Why is plastic hard when it is cold and soft when it is hot? Plastic is a polymer compound. It is linked together by thousands of small molecules to form a "chain" of macromolecules. Lubricating oil on the metal chain makes it easy to move between the various links. Between the macromolecular chains of plastics, no lubricating oil can be added, but after the addition of "plasticizers", the hard plastics become soft. Plastic plastic raincoats and sheets are much more plasticizers, so they can be folded and crumpled: Plastic sandals have less plasticizers. They are soft but do not fold: Some hard plastic tubes have less plasticizer. Bake on fire to become soft and bend.
Plastics are soft and hard, depending on whether plasticizers are added or not. However, ordinary plasticizers, like fried oil, become sticky as the temperature drops, and the ability to lubricate becomes smaller and smaller. The "lubricant" in the plastic macromolecular chain freezes and the plastic naturally becomes rigid. Therefore, plastic products used in cold areas and plastics for tropical use are different in the variety and proportion of plasticizers. Plastic products used for a long time, after the wind, sun, rain, and plasticizer evaporation, it will become hard and brittle, called plastic "aging."
Therefore, when the plastic raincoat is not in use, it must be wiped clean, folded, and stored in a plastic bag. General polyvinyl chloride, polystyrene and other plastic products are toxic and cannot be used to hold food. Milk bottles, cups, kettles and food bags are made of polyethylene. The chemical composition of polyethylene is similar to that of candle oil. It is non-toxic and has no plasticizer. We can use it with confidence. It is not difficult to identify polyethylene plastics. Its appearance is like wax. It melts and softens near the flame. It emits the smell of candle oil when burned. Other plastics, such as polyvinyl chloride, polystyrene, and organic glass, although they are also heated like polyethylene, melt and soften. , but there are different smells when burning.
Plastic shoes, plastic basins, plastic raincoats, artificial leather, etc. are made of polyvinyl chloride, toothbrush handles, soap boxes are made of polystyrene, triangles, semicircular meters, hairpins, buttons are made of plexiglass, plus utensils With the use of polyethylene, these types of plastics are softened when exposed to heat and harden when cold. They are called "thermoplastic" plastics.
The other type is "thermoset" plastic, which does not soften or melt when heated. It only burns and zooms. Aluminum pot handles, electrical and instrument housings, ink bottle caps, pen holders... these phenolic plastics (bakelite) products, as well as colorful pencil case shells, toys, models, etc. These polyamino-based plastics (electric jade) The products are all thermoset plastic raw powders that are "cast" out of steel molds. Thermosetting plastics are hard plastics that will never become soft after molding.
Plastics are soft and hard, depending on whether plasticizers are added or not. However, ordinary plasticizers, like fried oil, become sticky as the temperature drops, and the ability to lubricate becomes smaller and smaller. The "lubricant" in the plastic macromolecular chain freezes and the plastic naturally becomes rigid. Therefore, plastic products used in cold areas and plastics for tropical use are different in the variety and proportion of plasticizers. Plastic products used for a long time, after the wind, sun, rain, and plasticizer evaporation, it will become hard and brittle, called plastic "aging."
Therefore, when the plastic raincoat is not in use, it must be wiped clean, folded, and stored in a plastic bag. General polyvinyl chloride, polystyrene and other plastic products are toxic and cannot be used to hold food. Milk bottles, cups, kettles and food bags are made of polyethylene. The chemical composition of polyethylene is similar to that of candle oil. It is non-toxic and has no plasticizer. We can use it with confidence. It is not difficult to identify polyethylene plastics. Its appearance is like wax. It melts and softens near the flame. It emits the smell of candle oil when burned. Other plastics, such as polyvinyl chloride, polystyrene, and organic glass, although they are also heated like polyethylene, melt and soften. , but there are different smells when burning.
Plastic shoes, plastic basins, plastic raincoats, artificial leather, etc. are made of polyvinyl chloride, toothbrush handles, soap boxes are made of polystyrene, triangles, semicircular meters, hairpins, buttons are made of plexiglass, plus utensils With the use of polyethylene, these types of plastics are softened when exposed to heat and harden when cold. They are called "thermoplastic" plastics.
The other type is "thermoset" plastic, which does not soften or melt when heated. It only burns and zooms. Aluminum pot handles, electrical and instrument housings, ink bottle caps, pen holders... these phenolic plastics (bakelite) products, as well as colorful pencil case shells, toys, models, etc. These polyamino-based plastics (electric jade) The products are all thermoset plastic raw powders that are "cast" out of steel molds. Thermosetting plastics are hard plastics that will never become soft after molding.
Now we talk about the wearing of pets, from the Knit sweater, Woven shirts, skirts, Jeans and trousers, hats or caps, sock and shoe (also rain boots), also the necklace, hair clip, collar etc. all these is lets your pets more cutie and beautiful and get praise from surrounding pets and pets lovers, of courses, it will make your pets more active and healthy. and become the king or princess of the pets party.
Pet Clothing And Decoration,Pet Training Raincoat,Pet Waterproof Clothing,Dog Spring Clothing
NINGBO DAC ARTS & CRAFTS COMPANY , http://www.dacpets.com