Innovation of plastic processing technology of the

2022-08-10
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Ultra microporous plastics - innovation in plastic processing technology

ultra microporous plastics (MCP) is an important innovation in plastic processing technology, which has a major impact on the world plastic industry. Almost all plastic materials can be made into ultra microporous plastics

advantages of ultra microporous plastics compared with conventional (coarse pore) foamed plastics:

first of all, the pores of conventional foamed plastics are large, and it is impossible to foam into very thin films or sheets; Microcellular foamed plastics can achieve this goal. If the micropore size can be as small as 0.1 micron, it can successfully foam 20 micron thick sheets or films with good overall physical properties that are easy to heat after long-term operation of many household appliances. Similarly, it can also foam very fine ultra microporous fibers

the tested ultra microporous plastic shows better physical properties. Many ultra microporous plastics have better toughness and longer fatigue life. The mechanical strength is also much better than that of conventional coarse cell foamed plastics. Although the lowest density limit is not yet known, the density of ultra microporous plastics can be as low as 0.03 grams per cubic centimeter. At such a low density level, because the micropore size is very small, the thermal insulation performance of ultra microporous plastics is very excellent

due to the small pore size, foamed plastic is similar to non foamed plastic from the outside, but its internal quality has good physical properties. No. 2 ④ when the national quality supervision and inspection institution puts forward the requirements for type tests, the conventional foamed plastics with titanium oxide and other pigments are also opaque. What deserves great attention in the field of plastic processing is that the existing successful technology can produce transparent ultra microporous plastics with micropore size less than 0.05 microns

70% of the cost of plastic products of foamed plastics is material cost; In many applications, it is hopeful and possible to reduce the weight by more than 50%. Using this technology can reduce the cost of plastic products by more than 35%, which is of great practical significance. This technology can also improve the physical properties of plastic products while reducing the cost of materials. As the weight of the products is reduced, other costs such as transportation are also reduced

ultra microporous plastics can specially manufacture materials with open and closed pores according to the needs of applications. Open cell ultra microporous plastics have been produced from homopolymers or mixtures of two incompatible polymers

ultra microporous plastics are environmentally friendly products, because carbon dioxide or nitrogen is used in production to replace hydrocarbon or fluorine blowing agents. The products provided contain less plastic than conventional products, and less materials need to be recycled or discarded than conventional products. Furthermore, to produce the same plastic products, the ultra microporous plastic technology uses less materials and consumes less energy to eliminate the perfect protective effect

several conditions that must be met to manufacture ultra microporous Plastics:

-- the plastic must be saturated with enough gas and nucleate into a large number of ultra-fine micropores at the same time. Because the solubility of gas increases with the increase of pressure, higher pressure is required

-- in the development stage of micropore, the temperature must be controlled to control the stability of plastic matrix

-- a gas with suitable solubility and diffusibility for the selected plastic must be selected

-- in order to form a large number of ultra micropores, uniform nucleation must be dominant in the nucleation process, even if there is uneven nucleation

-- ultra microporous plastic can be classified as foamed plastic, but its micropore or cell size is less than 30 microns

-- the size of micropore or bubble is calculated by the average value of micropore

-- the density of foam can be defined as the specific gravity of foamed plastic

-- micropore density can be defined as the number of bubbles per cubic meter of unfoamed plastic (number of bubbles/per cubic meter of unfoamed plastic). The cell density can be calculated by counting the number of cells in the 100 micron long range along two orthogonal directions, which need to be replaced at the first time. Take the average value and calculate the number of cells in the three-dimensional direction by extrapolation

in ideal ultra microporous plastics, the cell size can be directly related to the cell density

in an ideal, closely arranged hexagonal or face centered cubic structure, the volume occupied by circular bubbles is about 74%, and the volume occupied by plastic between cavities is 26%. Therefore, the micropore density of an ideal round microporous plastic with precise arrangement is equal to (1/micropore size) x (1/0.26). The cell density of a 1 micron microporous plastic is 3.85 × 1012/unfoamed plastic per cubic centimeter. In addition to closed cell ultra microporous plastics, it can also produce open cell ultra microporous plastics

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