CN-118956134-B - PC composition and preparation method and application thereof

Abstract

The invention discloses a PC composition, a preparation method and application thereof, belonging to the technical field of high polymer materials, wherein the PC composition is prepared by optimizing the arrangement of inorganic filler introduced into components and simultaneously compounding a specific kind of lubricant, the high-strength and low-linear expansion coefficient can be realized under the condition of high filling quantity of the filling material, meanwhile, the anisotropy is small, the difference of the linear expansion coefficients in the horizontal and vertical directions is small, the appearance is good, and the comprehensive performance is excellent.

Inventors

• CHEN YONGWEN
• CHEN PINGXU
• YE NANBIAO
• AI JUNWEI
• YU LIANG
• Cen yin

Assignees

• 天津金发新材料有限公司

Dates

Publication Date

20260512

Application Date

20240828

Claims (12)

1. 1. The PC composition is characterized by comprising the following components in parts by weight: 40-55 parts of PC resin, 5-15 parts of flame retardant, 1-10 parts of glass fiber, 28-48 parts of inorganic filler particles and 0.01-1 part of lubricant; The glass fibers and inorganic filler particles satisfy: 0.4≤R/D≤1.8; Wherein R is the retention length-diameter ratio of the glass fiber, D is the retention average particle diameter of the inorganic filler particles, and the unit is mu m; the acid value of the lubricant is 15-32 mKOH/g.
2. 2. The PC composition of claim 1, wherein the glass fibers and inorganic filler particles satisfy: 0.6≤R/D≤0.9。
3. 3. The PC composition of claim 1, wherein the glass fibers have a retained aspect ratio of (20-42): 1.
4. 4. The PC composition of claim 3, wherein the glass fibers have a retention average diameter of 9 to 15 μm and a retention average length of 280 to 460 μm.
5. 5. The PC composition of claim 1 wherein the inorganic filler particles are at least one of talc, kaolin, wollastonite, and mica.
6. 6. The PC composition according to claim 5, wherein the inorganic filler particles preferably have a retention average particle diameter of 15 to 80 μm.
7. 7. The PC composition of claim 1, wherein the PC resin has a number average molecular weight of 15000 to 30000.
8. 8. The PC composition of claim 1 wherein the lubricant is an oxidized polyethylene wax.
9. 9. The PC composition according to claim 1, wherein the ratio of the total mass of the glass fiber and the inorganic filler particles to the mass of the lubricant is (150-225): 1.
10. 10. The method for preparing a PC composition according to any one of claims 1 to 9, comprising the steps of: and adding the components into a screw extruder, and carrying out melt extrusion granulation to obtain the PC composition.
11. 11. Use of a PC composition according to any one of claims 1 to 9 for the manufacture of office equipment parts.
12. 12. The application of claim 11, wherein the office equipment components include at least one of a printer internal support, a printer cartridge, and a device housing.

Description

PC composition and preparation method and application thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a PC composition and a preparation method and application thereof. Background PC (polycarbonate) has excellent mechanical properties and flame retardant properties, is a very ideal thermoplastic engineering material in theory, but in some application fields with higher requirements on rigidity and dimensional stability, PC materials can meet the requirements after inorganic materials (such as glass fibers, talcum powder and the like) are introduced for compounding modification, but the anisotropy of products can be greatly increased by the way, and especially after glass fibers are introduced, the mechanical properties of the products can be effectively improved compared with other inorganic materials, but the linear expansion degree difference of the products in different directions is increased during processing. On the other hand, high inorganic filler loading can give PC composites with good dimensional stability and mechanical strength, but can also give rise to poor appearance. Disclosure of Invention Based on the defects existing in the prior art, the invention aims to provide the PC composition, and the PC composition has the advantages that the arrangement of inorganic filler is introduced into the optimized components, meanwhile, the lubricant with a specific acid value is compounded, so that higher mechanical strength and low linear expansion coefficient can be realized under the condition of high filler filling quantity, meanwhile, the anisotropy is small, the difference of the linear expansion coefficients in the horizontal and vertical directions is small, the appearance is good, and the comprehensive performance is excellent. In order to achieve the above purpose, the invention adopts the following technical scheme: The PC composition comprises the following components in parts by weight: 40-55 parts of PC resin, 5-15 parts of flame retardant, 1-10 parts of glass fiber, 28-48 parts of inorganic filler particles and 0.01-1 part of lubricant; The glass fibers and inorganic filler particles satisfy: 0.4≤R/D≤1.8; Wherein R is the retention length-diameter ratio of the glass fiber, D is the retention average particle diameter of the inorganic filler particles, and the unit is mu m; the acid value of the lubricant is 15-32 mKOH/g. The PC composite material filled with the inorganic filler with high filling amount of the glass fiber composite is not fresh in the market, and the main reason is that the glass fiber composite inorganic filler has larger improvement range of mechanical property (especially bending modulus) and dimensional stability of the PC composite material compared with other filling systems, but the fiber morphology of the glass fiber can increase the anisotropism of the PC composite material, and the problem of poor appearance can be caused by filling the inorganic filler with high filling amount, therefore, in the technical scheme of the invention, the product introduces glass fiber with specific content and inorganic filler into PC resin matrix for compounding, and optimizes the size parameters of the glass fiber and the inorganic filler, so that the product can keep the flexural modulus to more than 10000MPa under the high inorganic material filling quantity, the dimensional stability is high, the linear expansion coefficient is low, and meanwhile, the glass fiber is fully embedded into inorganic filler particles to form uniformly distributed dispersion effect, the anisotropy of the glass fiber is inhibited, and the difference of the linear expansion coefficients of the product in different directions is small; if the size ratio of the glass fiber to the inorganic filler cannot meet the limit range, the product cannot necessarily maintain good isotropy and appearance at the high filling amount, and if the addition amount ratio of the glass fiber to the inorganic filler particles is not within the range, the expected effect cannot be achieved even if the regulation range of the size parameters thereof is met. On the other hand, under the arrangement of the inorganic material, the contact area of the inorganic material and the organic resin can be obviously increased, which leads to that the glass fiber, the surface of the inorganic filler particles or hydroxyl groups contained in the inorganic filler particles possibly migrate out in contact with the PC resin or in the subsequent use process, so that the PC resin is catalyzed to be degraded during high-temperature processing or use, the mechanical strength of the product can be reduced, even the linear expansion coefficient difference in different directions can be increased and the appearance problem can be caused, and therefore, an acidic lubricant is required to be introduced to lubricate and acidic modify the inorganic filler, however, if the acidic lubricant i