Method for reducing processing temperature of calcium carbonate granule filling ultra-high molecular polyethylene composite material

Abstract

A method for reducing the processing temperature of calcium carbonate particles in filling ultra-high molecular weight polyethylene material is characterized in that the following steps are included: (1) the calcium carbonate particles with two different particle sizes are mixed according to specific particle size and mass ratio; (2) the mixture is used for filling the ultra-high molecular weight polyethylene material according to the mass ratio of 20-50 percent; wherein the calcium carbonate particles with two different particle sizes are: calcium carbonate I: 200 meshes to 600 meshes; calcium carbonate II: 800 meshes to 2500 meshes; and the mass ratio of the calcium carbonate I and the calcium carbonate II stuffing is 30: 70 to 70: 30. The calcium carbonate stuffing with two different particle sizes in the optimal proposal undergoes surface treatment by 1-3 percent stearic acid. The method can remarkably reduce the processing temperature of polymer composite material (around 30 DEG C), ensure the color and luster of the composite material not to have yellow discoloration, improve the mechanical performance of the composite material by more than 25 percent and achieve the purposes of reducing energy consumption and lowering cost.

Description

technical field [0001] The invention relates to a chemical process, in particular to a method for reducing the processing temperature of ultra-high molecular weight polyethylene material (UHMWPE) filled with calcium carbonate particles. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a new type of engineering plastic with a molecular weight of more than 1.5 million. UHMWPE has excellent properties such as corrosion resistance, impact resistance, wear resistance and self-lubrication, especially its wear resistance is among the major plastics. Crowns, as materials for artificial joints, are widely used in cutting-edge fields such as medicine and microelectronics. However, it also has disadvantages such as poor temperature resistance, low modulus, and poor processing fluidity, so it must be modified. The modification of UHMWPE filled with inorganic particles is the most widely used method. The addition of inorganic particles It can effectivel...

AI Technical Summary

Problems solved by technology

However, it also has disadvantages such as poor temperature resistance, low modulus, and poor processing fluidity, so it must be modified. Inorganic particle filling modified UHMWPE is one of the most widely used methods. The addition of inorganic particles It can effectively improve the stiffness, modulus, dimensional stability and temperature resistance of UHMWPE, and UHMWPE filled with calcium carbonate particles is one of the most widely used composite materials

[0003] At present, the processing method of UHMWPE filled with calcium carbonate particles is basically obtained by twin-screw melt blending. Due to the high molecular weight of UHMWPE, the melt has a high processing viscosity, which seriously affects the processing performance of UHMWPE, and is very high. The melt viscosity requires that the processing temperature must be above 280°C.

Excessive processing temperature will often cause the degradation of UHMWPE, leading to the decline of the comprehensive performance of the composite material, making it difficult to reflect the superior performance of UHMWPE itself, and affecting the product quality and service life. In severe cases, it will also cause coking and carbonization of HDPE. As a result, the color of the product turns yellow and damages the appearance of the product, and the deposition of carbides on the processing equipment will also cause a decrease in the performance and service life of the processing equipment

At the same time, excessive processing temperature will consume a lot of energy, resulting in an increase in production costs.