High-impact-resistance transparent chemical-resistant PC / PCTG alloy and preparation method thereof

Abstract

The invention discloses a high-impact-resistance transparent chemical-resistant PC / PCTG alloy and a preparation method thereof, and belongs to the technical field of polymer composite materials. The PC / PCTG alloy is prepared from the following raw materials in parts by weight: 10 to 50 parts of PC, 20 to 90 parts of PCTG, 1 to 5 parts of a toughening agent, 0.3 to 0.5 part of an antioxidant, 0.2 to 0.5 part of a lubricating agent and 0.2 to 0.4 part of an ester exchange inhibitor. The PC / PCTG alloy prepared from the preparation raw materials has high transparency, high impact, heat resistance and chemical resistance, and is wide in application scene. The preparation method comprises the following steps: carrying out extrusion, cooling, granulation, drying and injection molding on the preparation raw materials mixed according to the ratio. The method is simple and easy to control and can be used for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of polymer composite materials, and in particular to a highly impact-resistant, transparent and chemically resistant PC / PCTG alloy and a preparation method thereof. Background Art

[0002] Polycarbonate (PC) is a high-strength, high-transmittance thermoplastic resin material with comprehensive properties such as heat resistance and electrical resistance. It also has the characteristics of impact resistance, dimensional stability, and flame retardancy. It is widely used in glass assembly, automotive industry, electronic appliances, mechanical parts, optical disks, packaging, computers and other office equipment, medical and health care, films, leisure and protective equipment, etc. However, due to the shortcomings of PC such as difficult processing and poor chemical resistance, its application in some environments that require chemical resistance, transparency, a certain degree of drop resistance, and certain heat resistance is limited, such as in household appliances such as sweeping robots.

[0003] At present, the most common way to improve the chemical resistance of PC is to add PET, ABS, PETG, PBT and other polymer materials with good oil resistance, but PET, PBT, ABS and other materials will affect the transparency of PC. In other words, it is difficult for existing PC alloy products to have high transparency, high impact, heat resistance and chemical resistance.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The object of the present invention is to provide a highly impact-resistant, transparent and chemically resistant PC / PCTG alloy and a preparation method thereof, so as to solve or improve the above-mentioned technical problems.

[0006] The present invention can be implemented like this:

[0007] In a first aspect, the present invention provides a high-impact, transparent and chemical-resistant PC / PCTG alloy. The raw materials for preparing the high-impact, transparent and chemical-resistant PC / PCTG alloy include, by weight, 10 to 50 parts of PC, 20 to 90 parts of PCTG, 1 to 5 parts of a toughening agent, 0.3 to 0.5 parts of an antioxidant, 0.2 to 0.5 parts of a lubricant and 0.2 to 0.4 parts of an ester exchange inhibitor.

[0008] In an optional embodiment, the mass ratio of PC to PCTG is 3:6.5 to 3:7.5.

[0009] In an optional embodiment, the raw materials for preparation include 30 parts of PC, 65-68 parts of PCTG, 1-4.1 parts of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0010] In an optional embodiment, the above-mentioned raw materials include 30 parts of PC, 67.1 parts of PCTG, 2 parts of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0011] In an optional embodiment, PC is transparent bisphenol A polycarbonate with a light transmittance of ≥89%.

[0012] In an optional embodiment, the toughening agent includes at least one of methyl methacrylate-butadiene styrene copolymer, ethylene-methyl acrylate-glycidyl methacrylate terpolymer, ethylene-acrylic plastic, ethylene-butyl acrylate-glycidyl methacrylate copolymer, glycidyl methacrylate, styrene-butadiene thermoplastic elastomer and methyl methacrylate-styrene-silicone-butyl acrylate.

[0013] In an alternative embodiment, the toughening agent includes methyl methacrylate-butadiene styrene copolymer and ethylene-methyl acrylate-glycidyl methacrylate terpolymer.

[0014] In an optional embodiment, the mass ratio of the methyl methacrylate-butadiene styrene copolymer to the ethylene-methyl acrylate-glycidyl methacrylate terpolymer is 1:1 to 2.5:1.

[0015] In an optional embodiment, the antioxidant includes at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), tris[2,4-di-tert-butylphenyl]phosphite, (3,5-di-tert-butyl-4-hydroxyphenyl)propionate oxalyl(diimino-2,1-ethylene ester), and bis(2,4-dicumylphenyl)pentaerythritol-diphosphite.

[0016] In an optional embodiment, the antioxidant includes at least two of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), tris[2,4-di-tert-butylphenyl]phosphite, (3,5-di-tert-butyl-4-hydroxyphenyl)propionate oxalyl(diimino-2,1-ethylene ester), and bis(2,4-dicumylphenyl)pentaerythritol-diphosphite.

[0017] In an alternative embodiment, the antioxidant includes pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and bis(2,4-dicumylphenyl)pentaerythritol-diphosphite.

[0018] In an optional embodiment, the mass ratio of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate to bis(2,4-dicumylphenyl)pentaerythritol diphosphite is 1:1 to 1:2.5.

[0019] In an alternative embodiment, the lubricant includes at least one of polyethylene wax, OP wax, PETS, montan wax and calcium stearate.

[0020] In an alternative embodiment, the lubricant comprises PETS.

[0021] In an optional embodiment, the transesterification inhibitor includes at least one of sodium dihydrogen phosphate, sodium pyrophosphate, sodium metaphosphate, ethyl orthosilicate, triethyl phosphite, triphenyl phosphite, diisooctyl phosphate, and alkyl phosphates.

[0022] In an alternative embodiment, the transesterification inhibitor comprises triphenyl phosphite.

[0023] In a second aspect, the present invention provides a method for preparing a highly impact-resistant, transparent and chemically-resistant PC / PCTG alloy as described in any of the aforementioned embodiments, comprising the following steps: extruding, cooling, granulating, drying and injection molding the raw materials mixed according to a ratio.

[0024] In an optional embodiment, extrusion is carried out using a twin-screw extruder having 11 temperature zones, and the temperatures of the 11 temperature zones are 118°C to 122°C, 228°C to 232°C, 228°C to 232°C, 228°C to 232°C, 228°C to 232°C, 228°C to 232°C, 228°C to 232°C, 228°C to 232°C, 228°C to 232°C, 228°C to 232°C, and 238°C to 242°C, and the rotation speed of the twin-screw extruder is 200rpm to 300rpm.

[0025] The beneficial effects of the present invention include:

[0026] The present invention compounds PC and PCTG according to a specific ratio, and on this basis, further compounds a toughening agent, an antioxidant, a lubricant and an ester exchange inhibitor in a specific ratio, so that the PC / PCTG alloy can have good impact strength and transparency while being heat-resistant (100° C.) and chemical-resistant. That is, a PC / PCTG alloy with high transparency, high impact, heat resistance and chemical resistance can be obtained, thereby expanding the application scope of the corresponding products. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0028] The highly impact-resistant, transparent and chemical-resistant PC / PCTG alloy provided by the present invention and its preparation method are specifically described below.

[0029] The invention provides a high-impact-resistant, transparent and chemical-resistant PC / PCTG alloy. The raw materials for preparing the high-impact-resistant, transparent and chemical-resistant PC / PCTG alloy include, by weight, 10 to 50 parts of PC, 20 to 90 parts of PCTG, 1 to 5 parts of a toughening agent, 0.3 to 0.5 parts of an antioxidant, 0.2 to 0.5 parts of a lubricant and 0.2 to 0.4 parts of an ester exchange inhibitor.

[0030] The amount of PC can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts, or other values ​​within the range of 10 to 50 parts.

[0031] The amount of PCTG can be 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or 90 parts, etc., or other values ​​within the range of 20 to 90 parts.

[0032] The amount of toughening agent used can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc., or other values ​​within the range of 1 to 5 parts.

[0033] The amount of the antioxidant can be 0.3 part, 0.35 part, 0.4 part, 0.45 part or 0.5 part, etc., or other values ​​within the range of 0.3 to 0.5 part.

[0034] The amount of lubricant used can be 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts or 0.5 parts, etc., and can also be other values ​​within the range of 0.2 to 0.5 parts.

[0035] The amount of the transesterification inhibitor used may be 0.2 parts, 0.3 parts, 0.35 parts, 0.4 parts, etc., or may be other values ​​within the range of 0.2 to 0.4 parts.

[0036] In some typical embodiments, the mass ratio of PC to PCTG can be 3:6.5 to 3:6.8, such as 3:6.5, 3:6.7 or 3:6.8, or other values ​​within the range of 3:6.5 to 3:6.8. In some more typical embodiments, the mass ratio of PC to PCTG is 3:6.71.

[0037] In some preferred embodiments, the raw materials for preparing the PC / PCTG alloy provided by the present invention include 30 parts of PC, 65-68 parts of PCTG, 1-4.1 parts of a toughening agent, 0.4 parts of an antioxidant, 0.2 parts of a lubricant and 0.3 parts of an ester exchange inhibitor.

[0038] In some more preferred embodiments, the raw materials for preparing the PC / PCTG alloy provided by the present invention include 30 parts of PC, 67.1 parts of PCTG, 2 parts of a toughening agent, 0.4 parts of an antioxidant, 0.2 parts of a lubricant and 0.3 parts of an ester exchange inhibitor.

[0039] In the present invention, PC may be, for example, transparent bisphenol A polycarbonate with a light transmittance of ≥89%, so that the alloy product can have a good light transmittance.

[0040] It should be noted that polyethylene terephthalate-1,4-cyclohexanedimethanol (PCTG) has high transparency, high impact strength and excellent chemical resistance, but its heat resistance is poor, which limits its use in environments requiring heat resistance (such as 100°C). The present invention compounds PC and PCTG according to the above conditions, which can maintain high impact performance of the PC / PCTG alloy without affecting transparency, and can improve the chemical resistance and processing performance of the product under certain heat resistance (such as 100°C) conditions.

[0041] In the present invention, the toughening agent may exemplarily but not limitatively include at least one of methyl methacrylate-butadiene styrene copolymer (MBS), ethylene-methyl acrylate-glycidyl methacrylate terpolymer, ethylene-acrylic acid plastic (EAA), ethylene-butyl acrylate-glycidyl methacrylate copolymer (PTW), glycidyl methacrylate (GMA), styrene-butadiene thermoplastic elastomer (SBS) and methyl methacrylate-styrene-silicone-butyl acrylate.

[0042] In some typical embodiments, the toughening agent includes methyl methacrylate-butadiene styrene copolymer (MBS) and ethylene-methyl acrylate-glycidyl methacrylate terpolymer. The mass ratio of methyl methacrylate-butadiene styrene copolymer to ethylene-methyl acrylate-glycidyl methacrylate terpolymer is 1.1:1 to 2.5:1, such as 1:1, 2:1 or 2.5:1, and may be other values ​​within the range of 1:1 to 2.5:1, preferably 1:1.

[0043] The refractive index of MBS used in the above toughening agent is close to that of PC and PCTG, and it hardly affects the transparency of PC / PCTG alloy. In addition, MBS has a small particle size and can be evenly distributed in the alloy material, which is beneficial to improving the impact strength of the alloy material. The ethylene-methyl acrylate-glycidyl methacrylate used in the above toughening agent has high reactivity, which can increase the compatibility of PC and PCTG and further improve the impact strength of the alloy product. Compounding methyl methacrylate-butadiene styrene copolymer and ethylene-methyl acrylate-glycidyl methacrylate terpolymer in the above ratio is beneficial to making the alloy product have better comprehensive performance.

[0044] In the present invention, the antioxidant may exemplarily but not limitatively include at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester (referred to as antioxidant 1010), N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide) (referred to as antioxidant 1098), tris[2,4-di-tert-butylphenyl]phosphite (referred to as antioxidant 168), (3,5-di-tert-butyl-4-hydroxyphenyl)propionate oxalyl(diimino-2,1-ethylene ester) (referred to as antioxidant 697), and bis(2,4-dicumylphenyl)pentaerythritol-diphosphite (referred to as antioxidant 608), and preferably includes at least two of the above substances.

[0045] In some typical embodiments, the antioxidant includes antioxidant 1010 and antioxidant 608. The mass ratio of antioxidant 1010 to antioxidant 608 may be 1:1 to 1:2.5, such as 1:1, 1:2 or 1:2.5, preferably 1:1.

[0046] In the present invention, the lubricant may illustratively but not limitatively include at least one of polyethylene wax, OP wax, PETS, montan wax and calcium stearate.

[0047] In some more typical embodiments, the lubricant includes PETS.

[0048] In the present invention, the transesterification inhibitor may illustratively but not limitatively include at least one of sodium dihydrogen phosphate, sodium pyrophosphate, sodium metaphosphate, ethyl orthosilicate, triethyl phosphite, triphenyl phosphite, diisooctyl phosphate, and alkyl phosphates.

[0049] In some typical embodiments, the transesterification inhibitor includes triphenyl phosphite.

[0050] As mentioned above, the PC / PCTG alloy prepared according to the above-mentioned raw materials provided in this application can have high transparency, high impact, heat resistance, and chemical resistance, and is applicable to a wide range of scenarios.

[0051] Correspondingly, the present invention also provides a method for preparing the above-mentioned highly impact-resistant, transparent and chemically resistant PC / PCTG alloy, comprising the following steps: extruding, cooling, granulating, drying and injection molding the raw materials mixed according to the ratio.

[0052] Among them, extrusion is carried out by a twin-screw extruder, the twin-screw extruder has 11 temperature zones, and the temperatures of the 11 temperature zones are 118°C-122°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C and 238°C-242°C, and the rotation speed of the twin-screw extruder is 200rpm-300rpm.

[0053] In some typical embodiments, the temperatures of the 11 temperature zones of the twin-screw extruder are 120°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C and 240°C, respectively, and the speed of the twin-screw extruder is 240rpm.

[0054] It should be noted that the preparation process not described in detail above can refer to the relevant existing technology and will not be elaborated or limited in detail here.

[0055] In addition, the present invention also provides applications of the above-mentioned highly impact-resistant, transparent and chemically resistant PC / PCTG alloy. For example, it can be used not only in the glass assembly industry, the automotive industry, electronic appliances, mechanical parts, optical disks, packaging, computers and other office equipment, medical and health care, films, leisure and protective equipment and other fields, but also in environments requiring chemical resistance, transparency, a certain degree of drop resistance, and certain heat resistance, such as in household appliances such as sweeping robots.

[0056] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0057] Example 1

[0058] The present embodiment provides a high impact resistant, transparent and chemical resistant PC / PCTG alloy material, wherein the raw materials for its preparation include, by weight, 30 parts of PC resin, 67.1 parts of PCTG, 2 parts of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0059] The PC resin is a transparent bisphenol A polycarbonate with a light transmittance of 89%. The toughening agent is methyl methacrylate-styrene-organic silicon-butyl acrylate. The antioxidant is composed of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and bis(2,4-dicumylphenyl) pentaerythritol-diphosphite in a mass ratio of 1:1. The lubricant is PETS. The ester exchange inhibitor is triphenyl phosphite.

[0060] The preparation of the PC / PCTG alloy material comprises: mixing the raw materials in a high-speed mixer according to a proportion, feeding them into a twin-screw extruder for extrusion, followed by water cooling for granulation, and drying for injection molding. The temperatures of 11 zones of the twin-screw extruder are respectively set to 120°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, and 240°C, and the main engine speed is 240rpm.

[0061] Example 2

[0062] The difference between this embodiment and embodiment 1 is that the toughening agent is methyl methacrylate-butadiene styrene copolymer.

[0063] Example 3

[0064] The difference between this embodiment and embodiment 1 is that the toughening agent is ethylene-methyl acrylate-glycidyl methacrylate copolymer.

[0065] Example 4

[0066] The difference between this embodiment and embodiment 1 is that the toughening agent is a terpolymer of methyl methacrylate-butadiene styrene copolymer and ethylene-methyl acrylate-glycidyl methacrylate in a mass ratio of 1:1.

[0067] Example 5

[0068] The difference between this embodiment and embodiment 4 is that the raw materials for preparation include 30 parts of PC resin, 65 parts of PCTG, 4.1 parts of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0069] Example 6

[0070] The difference between this embodiment and embodiment 4 is that the raw materials for preparation include 30 parts of PC resin, 68 parts of PCTG, 1.1 parts of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0071] Example 7

[0072] The difference between this embodiment and embodiment 4 is that methyl methacrylate-butadiene styrene copolymer is replaced by an equal amount of methyl methacrylate-styrene-silicone-butyl acrylate, that is, the toughening agent of this embodiment is composed of a terpolymer of methyl methacrylate-styrene-silicone-butyl acrylate and ethylene-methyl acrylate-glycidyl methacrylate.

[0073] Example 8

[0074] The difference between this embodiment and embodiment 4 is that: the PC resin is a transparent bisphenol A polycarbonate with a light transmittance of 89%. The toughening agent is ethylene-acrylic acid plastic. The antioxidant is N,N'-hexamethylene bis (3,5-di-tert-butyl-4-hydroxyphenylpropionamide). The lubricant is polyethylene wax. The ester exchange inhibitor is sodium dihydrogen phosphate.

[0075] The preparation of the PC / PCTG alloy material comprises: mixing the raw materials in a high-speed mixer according to a proportion, feeding them into a twin-screw extruder for extrusion, followed by water cooling for granulation, and drying for injection molding. The temperatures of 11 zones of the twin-screw extruder are respectively set to 118°C, 228°C, 228°C, 228°C, 228°C, 228°C, 228°C, 228°C, 228°C, 228°C, and 238°C, and the main engine speed is 200rpm.

[0076] Comparative Example 1

[0077] The difference between this comparative example and Example 4 is that the preparation raw materials include 99.4 parts of PC resin, 0.4 parts of antioxidant and 0.2 parts of lubricant.

[0078] Comparative Example 2

[0079] The difference between this comparative example and Example 4 is that the preparation raw materials include 99.4 parts of PCTG, 0.4 parts of antioxidant and 0.2 parts of lubricant.

[0080] Comparative Example 3

[0081] The difference between this comparative example and Example 4 is that the raw materials for preparation include 30 parts of PC resin, 69.1 parts of PCTG, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of transesterification inhibitor. That is, this comparative example does not contain a toughening agent.

[0082] Comparative Example 4

[0083] The difference between this comparative example and Example 4 is that the raw materials for preparation include 10 parts of PC resin, 88.1 parts of PCTG, 1 part of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0084] Comparative Example 5

[0085] The difference between this comparative example and Example 4 is that the raw materials for preparation include 20 parts of PC resin, 78.1 parts of PCTG, 1 part of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0086] Comparative Example 6

[0087] The difference between this embodiment and embodiment 4 is that the raw materials for preparation include 30 parts of PC resin, 68.1 parts of PCTG, 1 part of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0088] Comparative Example 7

[0089] The difference between this embodiment and embodiment 4 is that the raw materials for preparation include 40 parts of PC resin, 58.1 parts of PCTG, 1 part of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0090] Comparative Example 8

[0091] The difference between this embodiment and embodiment 4 is that the raw materials for preparation include 50 parts of PC resin, 48.1 parts of PCTG, 1 part of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

[0092] Test example

[0093] The materials prepared in Examples 1 to 8 and Comparative Examples 1 to 8 were subjected to the following performance tests, and the results are shown in Table 1.

[0094] Among them, the test conditions for chemical corrosion resistance are: temperature is 20℃±5℃; relative humidity ≤75%; air pressure is in the normal atmospheric pressure range of 86KPa~106KPa; the reagents of floor cleaner, alcohol, Blue Moon laundry detergent, Mr. Muscle, and 84 disinfectant are applied on the specimens respectively, and the specimens are kept bent with a stress test fixture, placed for 7 days, and the samples are checked after being restored at room temperature for 2 hours.

[0095] The light transmittance is measured by a light transmittance tester; the haze is measured by a light transmittance tester; the notched impact strength at room temperature is measured in accordance with ISO 179.

[0096] Table 1 Test results

[0097]

[0098]

[0099] It can be seen from Table 1 that the high impact resistant transparent chemical resistant PC / PCTG alloy material provided by the present invention has higher heat resistance and excellent chemical resistance than ordinary PC without affecting the transmittance and impact resistance. In the present invention, when the mass ratio of PC to PCTG is about 3:6.5 to 3:6.8, the requirements of heat resistance and chemical resistance are met. If the PC content is too high, the transparency of the system will be reduced, the chemical resistance will be insufficient, and the impact strength will be reduced; if the PCTG content is too high, the heat resistance of the alloy material will be reduced.

[0100] The methyl methacrylate-butadiene styrene copolymer selected in Example 4 is a transparent toughening agent, and its refractive index is close to that of PC and PCTG, and does not affect the transparency of the PC / PCTG alloy. If the refractive index difference is too large, it will cause light scattering and affect the transparency; and the methyl methacrylate-butadiene styrene copolymer has a small particle size and is more evenly distributed in the system, which improves the impact strength of the system; the ethylene-methyl acrylate-glycidyl methacrylate selected in this scheme has high reactivity, which can further increase the compatibility of PC and PCTG and further improve the impact strength. The two are used in combination to make the alloy product corresponding to Example 4 have the best comprehensive performance, and can have both high transparency, high impact, heat resistance and chemical resistance.

[0101] By comparing Examples 2 to 4 and Example 7, it can be seen that the methyl methacrylate-butadiene styrene copolymer and the ethylene-methyl acrylate-glycidyl methacrylate terpolymer in the toughening agent have a certain synergistic effect.

[0102] In summary, the raw material combination and ratio of the PC / PCTG alloy provided by the present invention are conducive to the preparation of PC / PCTG alloy products with high transparency, high impact, heat resistance and chemical resistance. The PC / PCTG alloy products can be used not only in the glass assembly industry, automobile industry, electronic appliances, mechanical parts, optical disks, packaging, computers and other office equipment, medical and health care, films, leisure and protective equipment and other fields, but also in environments requiring chemical resistance, transparency, a certain degree of drop resistance and certain heat resistance, such as household appliances such as sweeping robots.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly impact-resistant, transparent and chemically resistant PC / PCTG alloy, characterized in that: The raw materials for preparing the high-impact, transparent and chemical-resistant PC / PCTG alloy include, by weight, 10 to 50 parts of PC, 20 to 90 parts of PCTG, 1 to 5 parts of a toughening agent, 0.3 to 0.5 parts of an antioxidant, 0.2 to 0.5 parts of a lubricant and 0.2 to 0.4 parts of an ester exchange inhibitor.

2. The high impact resistant transparent chemical resistant PC / PCTG alloy according to claim 1, characterized in that: The mass ratio of the PC to the PCTG is 3:6.5 to 3:6.

8.

3. The high impact resistant, transparent and chemical resistant PC / PCTG alloy according to claim 2, characterized in that: The raw materials for preparation include 30 parts of PC, 65-68 parts of PCTG, 1-4.1 parts of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor; Preferably, the raw materials for preparation include 30 parts of PC, 67.1 parts of PCTG, 2 parts of toughening agent, 0.4 parts of antioxidant, 0.2 parts of lubricant and 0.3 parts of ester exchange inhibitor.

4. The highly impact-resistant, transparent and chemically resistant PC / PCTG alloy according to any one of claims 1 to 3, characterized in that: The PC is transparent bisphenol A polycarbonate with a light transmittance of ≥89%.

5. The highly impact-resistant, transparent and chemically resistant PC / PCTG alloy according to any one of claims 1 to 3, characterized in that: The toughening agent includes at least one of methyl methacrylate-butadiene styrene copolymer, ethylene-methyl acrylate-glycidyl methacrylate terpolymer, ethylene-acrylic acid plastic, ethylene-butyl acrylate-glycidyl methacrylate copolymer, glycidyl methacrylate, styrene-butadiene thermoplastic elastomer and methyl methacrylate-styrene-organic silicon-butyl acrylate; Preferably, the toughening agent comprises methyl methacrylate-butadiene styrene copolymer and ethylene-methyl acrylate-glycidyl methacrylate terpolymer; Preferably, the mass ratio of the methyl methacrylate-butadiene styrene copolymer to the ethylene-methyl acrylate-glycidyl methacrylate terpolymer is 1:1 to 2.5:

1.

6. The highly impact-resistant, transparent and chemically resistant PC / PCTG alloy according to any one of claims 1 to 3, characterized in that: The antioxidant comprises at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), tris[2,4-di-tert-butylphenyl]phosphite, (3,5-di-tert-butyl-4-hydroxyphenyl) propionate oxalyl(diimino-2,1-ethylene ester), and bis(2,4-dicumylphenyl)pentaerythritol-diphosphite; Preferably, the antioxidant comprises at least two of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), tris[2,4-di-tert-butylphenyl]phosphite, (3,5-di-tert-butyl-4-hydroxyphenyl) propionate oxalyl(diimino-2,1-ethylene ester), and bis(2,4-dicumylphenyl)pentaerythritol-diphosphite; More preferably, the antioxidant includes pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and bis(2,4-dicumylphenyl)pentaerythritol-diphosphite; More preferably, the mass ratio of the pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate to the bis(2,4-dicumylphenyl)pentaerythritol diphosphite is 1:1 to 1:2.

5.

7. The highly impact-resistant, transparent and chemically resistant PC / PCTG alloy according to any one of claims 1 to 3, characterized in that: The lubricant comprises at least one of polyethylene wax, OP wax, PETS, montan wax and calcium stearate; Preferably, the lubricant comprises PETS.

8. The high impact resistant, transparent and chemical resistant PC / PCTG alloy according to any one of claims 1 to 3, characterized in that: The transesterification inhibitor includes at least one of sodium dihydrogen phosphate, sodium pyrophosphate, sodium metaphosphate, ethyl orthosilicate, triethyl phosphite, triphenyl phosphite, diisooctyl phosphate, and alkyl phosphates; Preferably, the transesterification inhibitor comprises triphenyl phosphite.

9. A method for preparing a highly impact-resistant, transparent and chemically resistant PC / PCTG alloy as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: extruding, cooling, granulating, drying and injection molding the prepared raw materials mixed according to a proportion.

10. The preparation method according to claim 9, characterized in that: Extrusion is carried out using a twin-screw extruder having 11 temperature zones, and the temperatures of the 11 temperature zones are 118°C-122°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C, 228°C-232°C and 238°C-242°C, and the rotation speed of the twin-screw extruder is 200rpm-300rpm.

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