A PC / PBT composition suitable for spraying and preparation method thereof

Abstract

The invention discloses a polycarbonate (PC) / polybutylene terephthalate (PBT) composition suitable for spraying and a preparation method thereof. The composition mainly comprises the following components: 30-70 parts by weight of PC; 30-70 parts by weight of PBT; 5-20 parts by weight of polyarylate; and 0.1-2 parts by weight of triphenyl phosphite. Products formed by the PC / PBT composition are suitable for spraying.

Description

Technical Field

[0001] The invention relates to a PC / PBT composition suitable for spraying and a preparation method thereof. A product formed by the PC / PBT composition is suitable for spraying and belongs to the field of materials. Background Art

[0002] PC / PBT composites, which are prepared by blending PC and PBT in a certain ratio, are currently widely used materials. PC / PBT composites achieve good complementarity between the performance of PC and PBT and have good comprehensive performance. On the one hand, PC improves the heat resistance and impact resistance of PBT; on the other hand, PBT improves the chemical resistance of PC.

[0003] However, the use of PC / PBT compositions in the field of spraying is limited. Conventional products need to be baked in an oven at high temperature (80-90°C) after spraying. PC / PBT sprayed products are prone to obvious deformation after high-temperature baking, which not only affects the size and assembly, but also poses the risk of unreliable use. Summary of the invention

[0004] The purpose of the present invention is to provide a PC / PBT composition suitable for spraying and a preparation method thereof. The PC / PBT spraying product of the present invention has no obvious deformation after high-temperature baking.

[0005] In order to achieve the above invention object, the technical solution adopted by the present invention is as follows:

[0006] A PC / PBT composition suitable for spraying, comprising the following components:

[0007] 30-70 parts by weight of PC;

[0008] 30-70 parts by weight of PBT;

[0009] 5-20 parts by weight of polyarylate;

[0010] 0.1-2 parts by weight of triphenyl phosphite.

[0011] The PC / PBT composition suitable for spraying of the present invention, wherein the PC, under the test conditions of 300°C and 1.2kg, has a melt flow index of 3-65g / 10min, preferably 5-50g / 10min, and more preferably 7-35g / 10min. The higher the melt index of PC, the better the fluidity of PC, and the better the fluidity of the composition; however, the higher the PC melt index, the lower the PC molecular weight, and the worse the impact performance of the composition. Therefore, the advantage of limiting the PC melt index is to comprehensively balance the fluidity and impact performance of the composition.

[0012] The PC / PBT composition suitable for spraying of the present invention, wherein the PBT has a melt flow index of 3-50 g / 10 min, preferably 5-40 g / 10 min, and more preferably 10-30 g / 10 min, when tested at 240° C. and 5 kg.

[0013] The PC / PBT composition suitable for spraying of the present invention, wherein the polyarylate has a melt flow index of 5-40 g / 10 min, preferably 8-35 g / 10 min, and more preferably 10-30 g / 10 min, when tested at 330° C. and 1.2 kg.

[0014] The PC / PBT composition suitable for spraying of the present invention preferably has a purity of triphenyl phosphite of ≥95%.

[0015] Furthermore, the PC / PBT composition suitable for spraying of the present invention may optionally contain 0-5 parts of other additives; the other additives are selected from one or more combinations of flame retardants, toughening agents, compatibilizers, antioxidants, lubricants, ultraviolet absorbers, light stabilizers, heat stabilizers, metal passivators, plasticizers, anti-adhesive agents, colorants, coupling agents, nucleating agents, foaming agents, antibacterial agents, mildew inhibitors, acid scavengers, hydrolysis resistant agents, chain extenders, flow modifiers, matting agents, antistatic agents, reinforcing agents, fillers, antifogging agents, light diffusers, infrared absorbers, fluorescent brighteners and laser marking agents;

[0016] Wherein, the compatibilizer is any one or more of a maleic anhydride grafted polyolefin (PO-MAH), a maleic anhydride grafted hydrogenated styrene-butadiene block copolymer (SEBS-MAH), a maleic anhydride grafted acrylonitrile-styrene-butadiene copolymer (ABS-MAH), a styrene-maleic anhydride copolymer (SMA), a styrene-maleic anhydride-acrylonitrile copolymer (SMAH), ethylene-methyl acrylate (EMA), ethylene-butyl acrylate (EBA), and ethylene-butyl acrylate-glycidyl methacrylate copolymer (PTW);

[0017] The antioxidants are, for example, one or more combinations of hindered phenols, phosphites, thioesters, benzofurans, acryl-modified phenols, and hydroxylamine antioxidants;

[0018] The lubricant is, for example, a combination of one or more of fatty alcohols, metal soaps, fatty acids, fatty acid esters, montanic acid and its derivatives, amide waxes, saturated hydrocarbons, polyolefin waxes and its derivatives, silicone and silicone powder, and organic fluorine;

[0019] The ultraviolet absorber is, for example, a combination of one or more of benzophenone, benzotriazole, triazine, benzoate, cyanoacrylate, and phenylimidazole;

[0020] The antistatic agent is, for example, a combination of one or more of distearyl hydroxylamine, triphenylamine, tri-n-octylphosphine oxide, triphenylphosphine oxide, pyridine N-oxide, and ethoxylated sorbitan monolaurate;

[0021] Other additives can be selected conventionally in the art;

[0022] The PC / PBT composition suitable for spraying described in the present invention can be selectively used with the above-mentioned additives by those skilled in the art according to the product performance characteristics.

[0023] The present invention also provides a method for preparing the above-mentioned PC / PBT composition suitable for spraying, comprising the following steps:

[0024] (1) Premixing: PC, PBT, polyarylate, triphenyl phosphite and other optional additives are weighed and mixed according to the proportion.

[0025] (2) Extrusion: The mixture is extruded and granulated through a twin-screw extruder to obtain a PC / PBT composition suitable for spraying.

[0026] Furthermore, in a specific embodiment, in the above preparation method, the temperature of the conveying section of the twin-screw extruder is set to 210-220°C, the temperature of the plasticizing section is set to 225-270°C, the temperature of the metering section is set to 225-260°C, the screw speed is controlled to 200-600rpm, and the vacuum degree of the vacuum device of the twin-screw metering section is controlled to be less than -0.7 bar.

[0027] The positive effect of the present invention is that with the co-addition of polyarylate and triphenyl phosphite, the rigidity of the PC / PBT composition at high temperature is significantly enhanced, and the ability to resist deformation becomes stronger, so the PC / PBT spray product has no obvious deformation after high-temperature baking. DETAILED DESCRIPTION

[0028] For better understanding and implementation, the present invention is further described below in conjunction with embodiments, but the present invention is not limited to the listed embodiments, and should also include any other known changes within the scope of the rights claimed by the present invention.

[0029] The test method is as follows:

[0030] 1. The PC / PBT composition was injection molded into a plate with a size of 200 mm*100 mm*5 mm.

[0031] 2. Spray paint evenly on the PC / PBT sheet. The paint is C-691 from Kansai Paint Co., Ltd.

[0032] 3. Place the sprayed PC / PBT sheet in a 90°C oven and bake for 0.5 hours.

[0033] 4. After baking, observe the deformation and warping of the PC / PBT sheet to determine whether it is suitable for spraying.

[0034] Some of the raw materials for the comparative examples and embodiments are as follows:

[0035] 2150: PC, melt flow index is 15g / 10min (300℃, 1.2kg), produced by Wanhua Chemical;

[0036] 1100-211M: PBT, melt flow index is 22g / 10min (240℃, 5kg), produced in Changchun, Taiwan, China;

[0037] U-100-1: polyarylate, melt flow index is 20g / 10min (330℃, 1.2kg), produced by Unigene;

[0038] Triphenyl phosphite: purity 98%, produced by Aladdin;

[0039] AX8900: Ethylene-butyl acrylate-glycidyl methacrylate copolymer, produced by Arkema;

[0040] 1010: Antioxidant, produced by BASF AG;

[0041] 168: Antioxidant, produced by BASF AG;

[0042] PETS: Pentaerythritol stearate, lubricant, produced by Lonza Company, USA.

[0043] Examples 1-5 and Comparative Examples 1-3

[0044] The material preparation process is as follows: PC, PBT, polyarylate, triphenyl phosphite and additives are put into a high-speed mixer for mixing and stirring, and the mixture is added to a weightless feeder above the feeding port of a twin-screw extruder, and the temperature of the conveying section of the twin-screw extruder is controlled to be 210-220°C, the temperature of the plasticizing section is 225-270°C, the temperature of the metering section is 225-260°C, the screw speed is 200-600rpm, and the vacuum degree of the vacuum device of the twin-screw metering section is less than -0.7 bar. The mixture is subjected to the processes of blending, stranding, water cooling, air drying, pelletizing and drying to obtain the product.

[0045] The formulations (the amounts in the table refer to parts by mass) and properties of the PC / PBT compositions of Comparative Examples 1-3 and Examples 1-5 are detailed in Table 1.

[0046] Table 1 Formulation and properties of PC / PBT compositions of Comparative Examples 1-3 and Examples 1-5

[0047]

[0048] Note: The number of “+” indicates the deformation. The more “+”, the more serious the deformation. “O” indicates no deformation.

[0049] By comparing Examples 1-5 and Comparative Examples 1-3, it can be found that PC / PBT is obviously deformed and is not suitable for spraying; after adding polyarylate alone or triphenyl phosphite alone, PC / PBT is still obviously deformed and is not suitable for spraying; after adding polyarylate and triphenyl phosphite at the same time, PC / PBT has no obvious deformation and is suitable for spraying, indicating that polyarylate and triphenyl phosphite have a synergistic effect.

[0050] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments, and that various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and that these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A PC / PBT composition suitable for spraying, characterized in that: The composition comprises the following components: 30-70 parts by weight of PC; 30-70 parts by weight of PBT; wherein PC and PBT together account for 100 parts by weight; 5-20 parts by weight of polyarylate; 0.1-2 parts by weight of triphenyl phosphite; 0-5 parts of other additives; the other additives are selected from one or more of flame retardants, toughening agents, compatibilizers, antioxidants, lubricants, light stabilizers, metal passivators, plasticizers, anti-adhesive agents, colorants, coupling agents, nucleating agents, foaming agents, antibacterial agents, mildew inhibitors, acid scavengers, hydrolysis resistant agents, chain extenders, flow modifiers, matting agents, antistatic agents, reinforcing agents, fillers, anti-fogging agents, light diffusing agents, and laser marking agents.

2. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The PC has a melt flow index of 3-65 g / 10 min when the test conditions are 300° C. and 1.2 kg.

3. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The PC has a melt flow index of 5-50 g / 10 min when the test conditions are 300° C. and 1.2 kg.

4. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The PC has a melt flow index of 7-35 g / 10 min when the test conditions are 300° C. and 1.2 kg.

5. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The PBT has a melt flow index of 3-50 g / 10 min when the test conditions are 240° C. and 5 kg.

6. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The PBT has a melt flow index of 5-40 g / 10 min when the test conditions are 240° C. and 5 kg.

7. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The PBT has a melt flow index of 10-30 g / 10 min when the test conditions are 240° C. and 5 kg.

8. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The polyarylate has a melt flow index of 5-40 g / 10 min when the test conditions are 330° C. and 1.2 kg.

9. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The polyarylate has a melt flow index of 8-35 g / 10 min when the test conditions are 330° C. and 1.2 kg.

10. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The polyarylate has a melt flow index of 10-30 g / 10 min when the test conditions are 330° C. and 1.2 kg.

11. The PC / PBT composition suitable for spraying according to claim 1, characterized in that: The purity of triphenyl phosphite is ≥95%.

12. A method for preparing a PC / PBT composition suitable for spraying according to any one of claims 1 to 11, comprising the following steps: (1) Premixing: mixing PC, PBT, polyarylate, triphenyl phosphite and other optional additives; (2) Extrusion: The mixture is extruded and granulated through a twin-screw extruder to obtain a PC / PBT composition suitable for spraying.

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