Special material for UHMWPE (Ultrahigh molecular weight polyethylene) alloy capacity increasing and toughening modified polypropylene corrugated pipe and preparation method of special material

Abstract

The invention discloses a special material for an UHMWPE (Ultrahigh molecular weight polyethylene) alloy capacity increasing and toughening modified polypropylene corrugated pipe and a preparation method of the special material. The special material comprises, by weight, 60-85 parts of block co-polypropylene granules, 5-10 parts of fillers, 5-30 parts of capacity increasing and toughening agents and 1-5 parts of flowability modifiers. The corrugated pipe produced by the special material has the advantages of good mechanical properties, better low-temperature impact resistance, high heat distortion temperature, high heat conductivity coefficient, good flame resistance, good surface glossiness, good production stability and the like.

Description

technical field [0001] The invention belongs to a UHMWPE alloy volume-increasing and toughening-modified polypropylene bellows special material and a preparation method thereof. Background technique [0002] The high performance and engineering plasticization of general plastics is one of the most important pursuit goals in the field of polymer science and engineering research. Plastic toughening is one of the main means. The most commonly used and most effective toughening method is to introduce flexible polymers into the toughened matrix. When the system is impacted by external forces, it will absorb a large amount of impact energy by inducing the silver craze and shear yield of the matrix around the rubber particles, thereby improving the toughness of the matrix. A typical example of toughness is rubber toughened plastics. However, this type of method also has a fatal weakness, that is, although the toughness of the plastic matrix is ​​improved, it often results in a de...

AI Technical Summary

Problems solved by technology

At present, corrugated pipes for electric power are generally HDPE pipes and MPP single-wall corrugated pipes, which are respectively made of HDPE (high-density polyethylene) and toughened and reinforced modified polypropylene materials. These two materials can only be used for circular pipes and cannot be used. Requirements for the use of modified polypropylene pipes for square electric power

HDPE pipes have the following disadvantages: 1. Low Vicat temperature, poor heat resistance, less than 80 ℃; 2. Low tensile strength, less than 18 MPa; 3. Low flexural modulus, less than 800 MPa; 4. Poor flame retardancy, easy 5. Poor processability, high viscosity of HDPE material, resulting in slow production speed and poor gloss of pipe appearance

[0004] The MPP single-wall corrugated pipe is made of reinforced modified polypropylene raw materials. The main mechanism is to increase the strength of the pipe by adding a large amount of inorganic reinforcing materials (the circular pipe is limited by the structure, and the compressive capacity in the vertical direction is higher than that of the pipe). It is much lower than the square pipe, so it is necessary to make up the structural defects through materials), but in this way, the toughness index and other indexes of the material are greatly damaged, so there are the following disadvantages: 1. The low temperature performance is poor, because it is necessary to make up for the structural defects. Defects in compressive strength, a large amount of inorganic reinforcing materials are added to the material, which seriously damages the toughness of the material, and the impact performance is greatly reduced; 2. The tensile strength is low, generally about 22 MPa; 3. The surface of the product is smooth 4. Poor flame retardancy, because in order to increase the modulus of the material, a large amount of inorganic powder material is added to the formula, and the inorganic powder material has a combustion-supporting effect on the product, so it cannot be flame-retardant; 5. The thermal conductivity is low, ranging from 0.28 to 0.32, resulting in slow cooling and forming speed, low production speed and high processing cost

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