Polymethylmethacrylate composition and preparation method thereof

Abstract

The invention provides a polymethylmethacrylate composition and a preparation method thereof. The polymethylmethacrylate composition comprises the following components in percentage by weight: 20-70% of polymethylmethacrylate resin, 5-25% of flexibilizer, 0.2-2% of compatilizer, 0.05-5% of flame retardant, 0.1-1% of lubricant, 0.1-1% of UV absorbent and 0.15-2% of antioxygen. The preparation method of the polymethylmethacrylate composition comprises the following steps: weighing the components of the polymethylmethacrylate composition according to the weight proportion; mixing the polymethylmethacrylate, the compatilizer and the flame retardant for 10-30 minutes, then adding the flexibilizer and mixing for 10-30 minutes, and finally adding the lubricant, the UV absorbent and the antioxygen and mixing for 10-30 minutes; and melting, mixing, extruding and granulating the well mixed raw materials in the eight regions of a twin-screw extruder. The polymethylmethacrylate composition of the invention has high processing yield, high light transmittance, high surface hardness, favorable toughness, chemical stability, weather resistance and fire resistance.

Description

technical field [0001] The invention relates to a polymethyl methacrylate composition and a preparation method thereof, in particular to a polymethyl methacrylate composition improved in toughness, transparency and flame retardancy and a preparation method thereof. Background technique [0002] Polymethyl methacrylate (PMMA) plastic material is colorless and transparent, has excellent chemical stability and weather resistance, high surface hardness and scratch resistance, but it has the disadvantages of high notch sensitivity, low impact toughness and large residual internal stress of the product , so it is easy to break and shatter and appear whitish defects during processing and use, and is not suitable for making products with complex structures. [0003] The use of toughening modification technology for PMMA plastic materials can improve its toughness, thereby expanding its application range. However, the selection of toughening additives and the improper design of the ...

AI Technical Summary

Problems solved by technology

However, the selection of toughening additives and improper design of product production process will reduce the performance of other items at the same time, such as the decrease of transparency, the decrease of weather resistance and the decrease of flame retardancy, etc.

The use of tougheners with a core-shell structure can generally ensure the maximum performance of the material, but it often still cannot meet all the performance requirements in practical applications.

For example, for PMMA plastic base material, the shell constituting material of this core-shell structure toughening agent can be the methyl methacrylate (MMA) that has good compatibility with base material and close refractive index, has played neither influence transparency. The property does not affect the effect of surface hardness, but on the other hand, its core constituent material is generally a rubber phase that can absorb impact energy and toughen it. It is a flammable material, so this type of toughening will generally reduce the material flame retardant performance

For PMMA plastics, pure PMMA has a certain flame retardancy, which can reach the flame retardancy HB level under the UL94 standard, while PMMA added with a core-shell structure toughening agent can ensure that the toughness can be improved. It will make the material not have flame retardancy; at the same time, if the core constituent material is butadiene rubber, etc., it will also reduce the weather resistance of the material

[0004] On the other hand, the direct addition of toughening agent in the product molding process also has the disadvantages of uneven dispersion of additives and easy agglomeration, which not only affects the toughening effect of the final product, but also has the defect of white spots in the finished product

Images