CN-122011717-A - PC/ABS composition, and preparation method and application thereof

Abstract

The invention discloses a PC/ABS composition, a preparation method and application thereof. The PC/ABS composition comprises, by weight, 35-51 parts of polycarbonate, 29.5-40.5 parts of siloxane copolycarbonate, 12-16 parts of ABS resin, 1-20 parts of phosphorus flame retardant, 1-10 parts of organosilicon-acrylic rubber and 1-10 parts of nano silicon dioxide. According to the invention, the siloxane copolycarbonate, the nano silicon dioxide and the organic silicon-acrylic rubber are added into the phosphorus flame-retardant PC/ABS system, so that the obvious improvement of stress cracking resistance is realized, the flame retardance of the thin wall is not greatly influenced, and the flame retardant grade of 1.5mmV-0 can be still realized.

Inventors

• LIANG HUIQIANG
• Cen yin
• DING CHAO
• YU LIANG
• Peng minle
• WANG PEITAO
• JIANG GANGJUN
• ZHANG ZHIMING

Assignees

• 金发科技股份有限公司

Dates

Publication Date

20260512

Application Date

20260206

Claims (10)

1. 1. The PC/ABS composition is characterized by comprising the following components in parts by weight: 35-51 parts of polycarbonate; 29.5-40.5 parts of siloxane copolycarbonate; 12-16 parts of ABS resin; 1-20 parts of a phosphorus flame retardant; 1-10 parts of organic silicon-acrylic rubber; 1-10 parts of nano silicon dioxide.
2. 2. The PC/ABS composition according to claim 1, wherein the nanosilica has an average particle size of 3-500 nm, preferably 7-200 nm.
3. 3. The PC/ABS composition according to claim 1, wherein the silicone copolycarbonate comprises a dimethicone copolycarbonate, preferably wherein the dimethicone copolycarbonate comprises 3-12 wt% dimethicone.
4. 4. The PC/ABS composition according to claim 1, wherein the silicone-acrylate rubber comprises 30-85 wt% of silicone.
5. 5. The PC/ABS composition according to claim 1, wherein the phosphorus-based flame retardant comprises phosphazene and/or phosphate, preferably the phosphate comprises one or more of triphenyl phosphate, bisphenol A bis (diphenyl phosphate) or resorcinol (diphenyl phosphate).
6. 6. The PC/ABS composition according to claim 1 wherein at least one of the following five is satisfied: (a) The ABS resin comprises bulk ABS and/or emulsion ABS; (b) The butadiene content in the ABS resin is 5-30wt%; (c) The melt flow rate of the ABS resin at 220 ℃ under 10kg load is 1-25 g/10min; (d) The melt flow rate of the polycarbonate is 3-35 g/10min under the load of 1.2kg at the temperature of 300 ℃; (e) The number average molecular weight of the polycarbonate is 20000-30000.
7. 7. The PC/ABS composition of claim 1 further comprising 0.1 to 5 parts of a processing aid.
8. 8. A method of preparing the PC/ABS composition according to any one of claims 1 to 7 comprising the steps of: and uniformly mixing the components to obtain a premix, and extruding and granulating the premix to obtain the PC/ABS composition.
9. 9. Use of the PC/ABS composition according to any one of claims 1 to 7 in the automotive industry, electronic appliances, new energy, information communication, medical industry, including quadruped robots, humanoid robots.
10. 10. A robot comprising a power supply unit made using the PC/ABS composition according to any one of claims 1 to 7.

Description

PC/ABS composition, and preparation method and application thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a PC/ABS composition, a preparation method and application thereof. Background At present, a halogen-free flame retardant PC/ABS composition system generally adopts a phosphorus flame retardant as a main flame retardant, however, the introduction of the phosphorus flame retardant can reduce acting force among PC molecular chains, and the affinity effect of phosphorus flame retardant groups and ester solvents in the molecular structure of the PC/ABS composition system leads to remarkable degradation of stress cracking resistance of the material. The conventional modification technology improves the stress crack resistance by introducing methyl methacrylate-butadiene-styrene copolymer (MBS), but the addition of MBS damages the gas-condensed phase synergy of the phosphorus flame retardant, resulting in a decrease in flame retardant effect. However, with the development of industry, the requirements for materials are continuously upgraded, for example, automotive upholstery needs to withstand the long-term action of mediums such as cleaning agents and sweat, medical equipment shells are required to maintain dimensional stability and appearance integrity after being wiped by sterilized alcohol, in addition, the excellent stress cracking resistance of the peripheral component products of the power supply of the humanoid robot or the quadruped robot reduces the performance attenuation rate of the materials in the service environment, early failure caused by uneven stress is reduced, the service life is prolonged, and the like. In the prior art, the research on stress cracking resistance is single, for example, a certain amount of siloxane copolycarbonate and epoxy modified silicon-acrylic acid copolymerized resin are added in a non-flame-retardant PC resin system in CN 112980171A, so that the edible oil resistance of the PC resin can be improved, and good impact resistance and heat resistance are maintained. Therefore, there is a need in the art to develop a PC/ABS composition that has better stress crack resistance, while having good flame retardant properties. Disclosure of Invention The invention aims to overcome the defects or shortcomings of poor stress cracking resistance and difficult combination with flame retardant property in a phosphorus flame retardant PC/ABS composition system in the prior art, and provide a PC/ABS composition. It is another object of the present invention to provide a method for preparing the PC/ABS composition. It is a further object of the present invention to provide the use of said PC/ABS composition. In order to achieve the above purpose, the invention adopts the following technical scheme: The PC/ABS composition comprises the following components in parts by weight: 35-51 parts of polycarbonate; 29.5-40.5 parts of siloxane copolycarbonate; 12-16 parts of ABS resin; 1-20 parts of a phosphorus flame retardant; 1-10 parts of organic silicon-acrylic rubber; 1-10 parts of nano silicon dioxide. The PC/ABS composition provided by the invention has the advantages that specific content of siloxane copolycarbonate, nano silicon dioxide and organic silicon-acrylic rubber are introduced into a phosphorus flame-retardant PC/ABS composition system, so that the improvement of cracking resistance is realized, meanwhile, the flame retardance of a thin wall is not greatly influenced, and the flame retardance grade of 1.5mM V0 can be still realized, specifically, the siloxane copolycarbonate can reduce the internal stress level of the composition on the one hand, and can improve the hydrophobicity and oleophobicity of the surface of the composition and reduce the expansion rate caused by chemical agents on the other hand, the nano silicon dioxide can homogenize the stress level of the system, reduce the cracking risk of the composition, and meanwhile, the synergistic flame retardance can be realized through the synergistic effect of the siloxane copolycarbonate and the organic silicon-acrylic rubber, so that the flame retardance can be realized under the condition of reducing the addition amount of the phosphorus flame retardant. The PC/ABS composition of the present invention preferably contains not less than 30wt% of polycarbonate. In the present invention, the polycarbonate is 35 to 51 parts, for example, but not limited to 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts or 51 parts, etc., and specific point values among the above point values are limited to the space and for the sake of brevity, and the specific point values included in the range are not exhaustive. Preferably, the polycarbonate comprises bisphenol a type polycarbonate. Preferably, the melt flow rate of the polycarbonate is 3-35 g/10min