A kind of pmma/ionomer/pc ternary alloy and preparation method thereof

Abstract

The invention discloses a PMMA / ionomer / PC ternary alloy, which comprises the following components in parts by weight: 5-60 parts of carboxylic acid-based ionomer; 5-95 parts of polycarbonate; 1-35 parts of PMMA . Through the compounding of three resins, not only the pearlescent defects of PMMA / PC alloy can be significantly improved, but also the ternary alloy has the advantage of low forming stress, which is conducive to the preparation of high-toughness products with complex structures.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a PMMA / ionomer / PC ternary alloy and a preparation method thereof. Background technique [0002] Polycarbonate (referred to as PC) is a high molecular polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it can be divided into aliphatic, aromatic, aliphatic-aromatic and other types. Due to the special structure of polycarbonate, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics. Polycarbonate is a synthetic material that began to be developed in the late 1950s. Polycarbonate resin has outstanding impact resistance, creep resistance, and dimensional stability. It is widely used in the fields of electronic appliances, rail transit, and aerospace. In recent years, the amount of polycarbonate resin has surpassed that of nylon, ranking first. [0003] However,...

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Problems solved by technology

[0003] However, polycarbonate also has defects such as surface gloss, surface scratch resistance, and insufficient strength. The general solution is to blend with PMMA (polymethyl methacrylate) to form PMMA / PC alloy

However, due to the different refractive index of the PMMA / PC resin matrix, the light is refracted in the resin matrix and the pearlescent effect occurs.

Chinese patent application 2018108054686 discloses a PC / PMMA composite material, which uses the difference in gloss between the two to produce a pearlescent effect, avoiding the formation of conventional silver pearlescent spray-free materials due to the addition of aluminum powder or pearlescent powder. Flow mark or weld line problem

Chinese patent application 2016104106339 discloses a transparent scratch-resistant PC / PMMA alloy, by using a metal-organic compound stabilizer A, a phosphorus-containing compound stabilizer B, and adding the stabilizer B to the molten system by side feeding , can solve the pearlescent, yellowing and other problems existing in the preparation of transparent scratch-resistant PC resin composition in the prior art

Chinese patent application 2018106764638 discloses a transparent high-hardness PC composition. By blending polyester copolymer, styrene copolymer and PC, it solves the problems of poor compatibility, poor toughness and opacity between PC and PMMA alloy in the prior art. Pearlescent problem

[0004] Regarding the molding stress, the polycarbonate molecular main chain is relatively rigid, and the adjustment of the molecular chain will be relatively slow during the injection molding process, resulting in a higher molding stress

Generally, there are three main ways to reduce stress: 1. Reduce the viscosity of polycarbonate, but it will lead to a significant drop in mechanical properties; 2. Reduce stress by adjusting molding parameters during the molding process; 3. Introduce ABS resin It is made into PC / ABS alloy, but the alloy has low surface hardness and poor scratch resistance

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