Solvent-resistant infrared-penetrable PC alloy composite material and preparation method thereof

Abstract

The invention discloses a solvent-resistant infrared-penetrable PC alloy composite material and a preparation method thereof, and the solvent-resistant infrared-penetrable PC alloy composite material comprises the following components in parts by weight: 60-90 parts of PC, 10-40 parts of PCT, 0.01-0.4 part of a transesterification inhibitor and 0.001-0.3 part of an infrared penetrating agent. According to the chemical-solvent-resistant infrared-penetrable PC alloy material disclosed by the invention, the transmittance of PC in a near-infrared region is improved by adding the infrared penetrating agent, and meanwhile, the transmittance of PC in a visible region is reduced; by adding the PCT, the transparency of the PC can be improved, the chemical solvent resistance of the PC can be improved, and the stress cracking of the PC is avoided. The method is suitable for infrared detection, monitoring, remote controllers and intelligent door locks.

Description

Technical Field

[0001] The invention relates to a PC alloy modified plastic, in particular to a PC alloy material resistant to chemical solvents and capable of infrared penetration and a preparation method thereof. Background Art

[0002] Infrared is an electromagnetic wave between visible light and microwaves, with the characteristics of long wavelength, strong penetrating ability and high energy. Infrared has been widely used in signal transmission and energy transmission. Infrared penetrating materials refer to materials that can transmit infrared radiation.

[0003] PC is a high molecular polymer containing carbonate groups in its molecular chain. It is colorless, transparent, heat-resistant, impact-resistant, has high light transmittance and good optical properties. After adding infrared transmitting materials to polycarbonate materials, it is modified into infrared penetrating PC materials, which can transmit infrared radiation.

[0004] Common infrared penetrating PC materials are often used to make components of infrared instruments, such as windows of infrared detectors, lenses and prisms of infrared instrument optical systems, smart door locks, home monitoring, etc.

[0005] The transmittance of PC resin (400-1200nm) is greater than 88%. In the field of infrared remote control and rear camera, PC near-infrared penetration efficiency is required to be greater than 80% at 800nm-1200nm, and visible light shielding efficiency is less than 1% at 400-760nm. Existing PC resin cannot achieve this.

[0006] Chinese patent CN116285292A discloses "an infrared-transmissive PC material and its preparation method", which proposes to use special effect dyes to achieve visible light shielding and improve infrared penetration of the material; patent CN117820834A 'a high-hardness, scratch-resistant, infrared-transmissive PC material and its preparation method' proposes to improve the surface hardness, scratch resistance and infrared penetration of PC by adding special wear-resistant agents, scratch-resistant agents and infrared penetrants.

[0007] After long-term operation of the infrared detection devices that use infrared-penetrating PC, the surface of the shell will be polluted by long-term immersion in sweat, hand sanitizer, and disinfectant, and the PC will easily crack when it comes into contact with chemical solvents. The silicon PC developed by SABIC can partially improve the material's resistance to chemical solvents, but transparency and price have become obstacles to large-scale applications. Traditional PC / ABS, PC / PE and other alloys will cause PC transparency to drop rapidly and cannot meet the requirements. Therefore, finding an infrared-penetrating material that is resistant to chemical solvents and does not affect the transmittance of PC resin has great application prospects in infrared applications. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the existing infrared penetrating PC technology, the technical problem to be solved by the present invention is to improve the chemical solvent resistance of infrared penetrating PC without affecting the transparency of the PC material, so as to achieve the goal of PC alloy material having a near-infrared penetration efficiency of greater than 80% at 800nm-1200nm and a visible light shielding efficiency of less than 1% at 400-760nm after adding an infrared penetrant.

[0009] The inventors unexpectedly discovered that adding PCT to PC only slightly reduces the transparency of PC, but effectively improves the chemical resistance of PC materials; at the same time, they found that adding a very small amount of ester exchange inhibitor can appropriately improve the transmittance and impact strength of PC / PCT alloy materials.

[0010] The technical problem to be solved by the present invention is achieved through the following technical solutions: A chemical solvent-resistant infrared-transmissive PC alloy material comprises the following components by weight: 60-90 parts of PC, 10-40 parts of PCT, 0.01-0.4 parts of ester exchange inhibitor, and 0.001-0.3 parts of infrared penetrant.

[0011] The PC resin has a melt index of 7-20 g / 10 min under the test conditions of ISO1133-1-2011 at 300° C. and 1.2 kg, a light transmittance (2 mm) of greater than 88%, and a haze (2 mm) of less than 1%.

[0012] The PCT resin is fully called poly(1,4-cyclohexane dimethanol terephthalate), and has a light transmittance (2 mm) greater than 88% and a haze (2 mm) less than 1%.

[0013] The transesterification inhibitor is one or both of sodium dihydrogen phosphate and triphenyl phosphite.

[0014] The infrared penetrant is a composite of one or more of carbon black, aniline black and platinum series dyes.

[0015] The chemical solvent-resistant infrared-transmitting PC alloy material of the present invention can be prepared by a common method in the industry, for example: each component is weighed according to a proportion, mixed evenly, melt-mixed, extruded and granulated to obtain the anti-aging PC / PCT plastic alloy.

[0016] Specifically, each component can be weighed according to the ratio, and the speed is controlled at 400-500 rpm at room temperature in a mixer, mixed for 5 minutes, taken out and transferred to a screw extruder, extruded and granulated at a temperature of 220-260° C., and the main engine speed is controlled at 200-500 rpm, preferably 200 rpm in the present invention, to obtain the chemical solvent-resistant infrared-transmissive PC alloy material.

[0017] Obviously, in order to improve other properties of the product in the present invention, other additives such as flame retardants, colorants and antistatic agents can be adaptively added.

[0018] The invention discloses a PC alloy material that is resistant to chemical solvents and can transmit infrared light. The PC alloy material improves the chemical solvent resistance of PC by adding PCT to avoid PC cracking. The PC / PTT transparency is improved by adding an ester exchange inhibitor and a special extrusion process, and the chemical resistance of PC can also be improved. The PC alloy material is suitable for infrared detection, monitoring, remote control, and smart door locks. DETAILED DESCRIPTION

[0019] Examples 1-10 Weigh the raw materials according to the data of Examples 1-10 in Table 1. Add the components into a high-speed mixer, control the speed at 450 rpm at room temperature, and mix for 5 minutes; transfer to a screw extruder, extrude and granulate at a temperature of 220-260° C., and control the speed of the screw main engine at 200 rpm to obtain a chemical solvent-resistant infrared-transmissive PC alloy material.

[0020] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 PC 99.7 65 85 65 75 85 65 65 65 65 PCT 34.7 14.7 34.7 24.7 14.7 34.7 34.7 34.7 34.7 Transesterification inhibitor NaH2PO4 0.15 0.15 0.15 0.25 0.5 Transesterification inhibitor TPPI 0.15 0.15 0.15 0.25 0.5 Infrared penetrant carbon black 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Infrared penetrant aniline black 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Infrared penetrant platinum dyes 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 PC resin uses the injection-molding grade PC resin of Japanese Teijin Co., Ltd. with the grade of 1250Y; PCT resin uses PCT resin with brand 0502 from SK Company of South Korea; The ester exchange inhibitor sodium dihydrogen phosphate (NaH2PO4) was selected from Zhangjiagang Yarui Chemical; The transesterification inhibitor TPPI was selected from Zhangjiagang Yarui Chemical; Infrared penetrant carbon black is selected from Korean KCB 900L; Infrared penetrant carbon black is selected from German BASF L0080; The infrared penetrant is selected from the American Eplin platinum dye DT19-25A DYE Comparative Example 1-10: Increase the screw main engine speed to 500 rpm Weigh each raw material according to the data of the corresponding proportions 1-10 in Table 2. Add each component into a high-speed mixer, control the speed at 450 rpm at room temperature, and mix for 5 minutes; transfer to a screw extruder, extrude and granulate at a temperature of 220-260°C, and control the speed of the screw main engine at 500 rpm to obtain a chemical solvent-resistant infrared-transmissive PC alloy material.

[0021] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 PC 99.7 65 85 65 75 85 65 65 65 65 PCT 34.7 14.7 34.7 24.7 14.7 34.7 34.7 34.7 34.7 Transesterification inhibitor NaH2PO4 0.15 0.15 0.15 0.25 0.5 Transesterification inhibitor TPPI 0.15 0.15 0.15 0.25 0.5 Infrared penetrant carbon black 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Infrared penetrant aniline black 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Infrared penetrant platinum dyes 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 PC resin uses the injection-molding grade PC resin of Japanese Teijin Co., Ltd. with the grade of 1250Y; PCT resin uses PCT resin with brand 0502 from SK Company of South Korea; The ester exchange inhibitor sodium dihydrogen phosphate (NaH2PO4) was selected from Zhangjiagang Yarui Chemical; The transesterification inhibitor TPPI was selected from Zhangjiagang Yarui Chemical; Infrared penetrant carbon black is selected from Korean KCB 900L; Infrared penetrant carbon black is selected from German BASF L0080; The infrared penetrant is selected from the Eplin platinum dye DT19-25A DYE In order to verify the performance of the chemical solvent-resistant and penetrable PC alloy materials of the present invention as shown in Table 1 and Table 2, the example products (1-10) and the comparative example products (1-10) were injection molded with 70x50x2mm discs and simply supported beam impact specimens at 260-270°C using an injection molding machine. Half of the simply supported beam notched impact specimens were also soaked in chemical solvents for 30 minutes, then taken out and dried for later use. Subsequently, the transmittance of the samples at different wavelengths was tested using an ultraviolet spectrophotometer, and the simply supported beam notched impact specimens were tested at 23°C using a simply supported beam impact tester. Specific test results are shown in Tables 3 and 4 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Transmittance% (400-760nm) 0.9 0.38 0.40 0.52 0.50 0.52 0.55 0.45 0.62 0.54 Transmittance% (800-1200nm) 84.1 72.5 74.5 83.2 82.8 84.1 83.2 74.5 82.5 73.1 <![CDATA[Notched impact of simply supported beam KJ / m 2 > 50.2 36.3 37.4 44.5 45.4 44.8 46.2 38.4 43.2 33.8 <![CDATA[(84 disinfectant) Simply supported beam notched impact KJ / m 2 > 10.3 23.2 22.4 26.5 24.5 24.8 24.5 19.8 24.5 20.3 <![CDATA[(Household cleaner) Notched Izod impact KJ / m 2 > 12.2 23.8 21.8 24.7 23.4 23.9 24.8 22.4 23.2 21.4 <![CDATA[(Sunscreen) Notched Izod impact KJ / m 2 > 13.1 21..5 21.2 24.8 23.7 21.9 23.7 21.7 23.4 22.1 <![CDATA[(3% hydrogen peroxide) Notched Izod impact KJ / m 2 > 10.4 21.8. 23.4 25.4 23.4 22.8 23.4 21.4 22.7 18.4 <![CDATA[(Rapeseed oil) Notched Izod impact KJ / m 2 > 8.5 22.5 20.5 22.8 22.6 21.4 23.5 22.5 23.8 22.7 Note: 84 disinfectant, household cleaner, sunscreen, 3% hydrogen peroxide, and rapeseed oil are all commercially available. Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Transmittance% (400-760nm) 0.78 0..68 0.66 0.52 0.50 0.49 0.53 0.48 0.63 0.57 Transmittance% (800-1200nm) 84.8 68.5 70.8 79.2 78.8 80.5 79.2 69.3 78.2 67.8 <![CDATA[Notched impact of simply supported beam KJ / m 2 > 55 35.3 36.4 40.5 40.4 39.8 42.2 35.4 39.2 28.8 <![CDATA[(84 disinfectant) Simply supported beam notched impact KJ / m 2 > 10.4 19.2. 17.4 23.5 21.5 21.8 20.5 17.8 20.2 17.8 <![CDATA[(Household cleaner) Simple supported beam notched impact KJ / m 2 > 11.2 19.5 18.2 20.1 19.4 19.9 20.8 18.4 20.2 18.4 <![CDATA[(Sunblock) Notched Izod impact KJ / m 2 > 12.1 18.5 17.5 20.7 20.4 18.7 23.7 17.1 19.4 18.0 <![CDATA[(3% hydrogen peroxide) Notched Izod impact KJ / m 2 > 10.2 18.9 18.4 21.2 20.4 18.8 19.8 17.8 18.7 16.4 <![CDATA[(Rapeseed oil) Notched Izod impact KJ / m 2 > 8.7 17.5 16.5 17.8 18.6 17.4 19.5 18.5 19.8 18.7 Note: 84 disinfectant, household cleaner, sunscreen, 3% hydrogen peroxide, and rapeseed oil are all commercially available. It can be seen from Table 3 Example 1 that the transmittance of the infrared-transmissive PC with the addition of infrared absorber meets the standard, but when the PC material is exposed to various chemical solvents, its notched impact strength decreases rapidly, with a decrease of more than 80%; the infrared-transmissive PC / PCT alloys in Table 3 Examples 2 and 3 have significantly better chemical resistance than ordinary infrared-transmissive PC, and their notched impact strength decreases less after being immersed in various chemical solvents, basically maintaining about 50%, while the infrared transmittance is slightly lower than that of pure PC.

[0022] From Table 3, Examples 4-10, it can be seen that the infrared-transmissive PC / PCT with added ester exchange inhibitors has a chemical resistance similar to that of Examples 2-3, but its infrared transmittance is improved to a certain extent compared with PC / PCT without added ester exchange inhibitors. However, the maximum addition amount of these two ester exchange inhibitors is about 0.3%. Once it exceeds 0.5%, its infrared transmittance will decrease.

[0023] From the comparison of Table 4 Comparative Example 1 and Table 3 Example 1, it can be seen that the screw speed (500 rpm) has no significant effect on the infrared permeable PC properties and the screw speed (200 rpm); from the comparison of Table 4 Comparative Examples 2-10 and Table 3 Examples 2-10, it can be seen that the screw speed (500 rpm) has a significant effect on the infrared permeable PC properties and the screw speed (200 rpm), which is mainly reflected in the significant decrease in infrared transmittance, and its initial notched impact strength and solvent soaking notched impact strength also decrease. Therefore, a lower screw speed is more conducive to improving the chemical resistance and infrared permeability of PC / PCT alloy than a higher screw speed.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the protection scope of the present invention. Although the present invention is described in detail with reference to the preferred solution, those skilled in the art should understand that the technical solution of the present invention can be modified and replaced without departing from the essence and scope of the present invention.

Claims

1. A chemical solvent resistant infrared penetrable PC alloy material, characterized in that: By weight, it comprises the following components: 60-90 parts of PC, 10-40 parts of PCT, 0.01-0.4 parts of ester exchange inhibitor, 0.001-0.3 parts of infrared penetrant.

2. The infrared-transmissive PC alloy material resistant to chemical solvents as claimed in claim 1, characterized in that: The PC resin has a melt index of 7-20 g / 10 min, a light transmittance (2 mm) of greater than 88%, and a haze (2 mm) of less than 1%.

3. The infrared-transmissive PC alloy material resistant to chemical solvents as claimed in claim 1, characterized in that: The PCT resin is fully called poly(1,4-cyclohexane dimethanol terephthalate). Its light transmittance (2mm) is greater than 88%, and its haze (2mm) is less than 1%.

4. The infrared-transmissive PC alloy material resistant to chemical solvents as claimed in claim 1, characterized in that: The transesterification inhibitor is one or two of sodium dihydrogen phosphate (Na2H2PO4) and triphenyl phosphite (TPPI).

5. The infrared-transmissive PC alloy material resistant to chemical solvents as claimed in claim 1, characterized in that: The infrared penetrant is a composite of one or more of carbon black, aniline black and platinum series dyes.

6. The method for preparing a chemical solvent-resistant infrared-transmissive PC alloy material according to claims 1-4, characterized in that: Contains the following steps: The components are mixed evenly, and then transferred into a twin-screw extruder for melt mixing and extrusion, and then cooled and pelletized to obtain the chemical solvent-resistant infrared-transmitting PC material.

7. The infrared-transmissive PC alloy material resistant to chemical solvents as described in claims 1 to 4 is used for outdoor detection, monitoring, remote control, and smart door locks.