A polymethyl methacrylate composition, a method for producing the same, and a polymethyl methacrylate article

Abstract

The present application relates to the technical field of high polymer material preparation, in particular to a polymethyl methacrylate composition, a preparation method thereof and a polymethyl methacrylate product, wherein a cleaning agent containing a liquid alcohol substance is added to a polymethyl methacrylate base material and a colorant, and the mass ratio of the polymethyl methacrylate base material to the cleaning agent is controlled within a proper range, so that the polymethyl methacrylate base material and the colorant form granular substances during mixing, thereby effectively improving the wall sticking problem of the colorant, effectively shortening the time required for cleaning the equipment and reducing the labor cost.

Description

Technical Field

[0001] This invention relates to the field of polymer material preparation technology, specifically to a polymethyl methacrylate composition, its preparation method, and polymethyl methacrylate products. Background Technology

[0002] Polymethyl methacrylate (PMMA) is a high-transmittance polymer material, with a transmittance exceeding 90%. It also features low haze, ease of processing, and easy dyeing, making it widely used in automotive and motorcycle lighting, such as taillights. Most taillights are made by adding red, orange, or other colorants to PMMA and then blending, extruding, granulating, and injection molding. Furthermore, PMMA can be mixed with toughening agents to produce coloring alloys for decorative exterior parts of high-end vehicles or other products. The formulations of modified PMMA materials for automotive lighting often include antioxidants, light stabilizers, release agents, and colorants. For example, Chinese patent (CN 117417616A) describes a PMMA composition and its preparation method. CN107841077A improves heat resistance by adding SMA resin.

[0003] In the production of this type of material, PMMA base material, toughening agents, colorants, and various additives are typically uniformly mixed and then fed into a screw extruder via a loss-in-weight weigher or forced feeder. The mixture is melted, extruded, cooled, and granulated to produce plastic granules. These granules are then injection molded into the desired shape. Because colorants are added during the production process, a significant amount of colorant residue remains in the mixing equipment and conveying pipelines due to prolonged production time and the exothermic mixing process. This poses considerable difficulties for equipment cleaning during production transitions or switchovers, often requiring complete disassembly for thorough cleaning, which is time-consuming and severely impacts equipment efficiency.

[0004] Therefore, if it is possible to avoid the situation where a large amount of pigment sticks to the wall during the mixing process, thereby improving the current problems of difficult equipment cleaning and long cleaning cycles in the processing, it is an urgent technical problem to be solved in the production of polymethyl methacrylate products. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem of difficult equipment cleaning and long cleaning cycle caused by a large amount of residual colorant in polymethyl methacrylate compositions in the prior art.

[0006] The present invention provides a polymethyl methacrylate composition comprising a polymethyl methacrylate base, a colorant, and a cleaning agent, wherein the cleaning agent comprises a liquid alcohol, and the mass ratio of the polymethyl methacrylate base to the cleaning agent is 59.2–97.79:0.2–0.8; preferably 67.8–88.2:0.32–0.67.

[0007] Liquid alcohols refer to alcohols that are liquid at room temperature and pressure. In this invention, the liquid alcohol can be C1-C2. 10 It is one or more of monohydric or polyhydric alcohols, in which the H atoms of alkanes, alkenes, alkynes, or aromatic hydrocarbons are replaced by 1 to 3 hydroxyl groups. Examples of liquid alcohols include one or more of methanol, ethanol, ethylene glycol, isopropanol, n-butanol, isobutanol, n-hexanol, citronellol, geraniol, and n-decyl alcohol.

[0008] Polymethyl methacrylate can be synthesized using conventional methods in the field, or it can be commercially available.

[0009] Furthermore, the mass ratio of the polymethyl methacrylate base material to the colorant is 59.2–97.79:0.16–4.3; preferably 67.8–88.2:0.45–2.5.

[0010] The colorant comprises pigment powder; preferably, the colorant comprises one or more of carbon black, 4-(2-methylbutenyl)benzoic acid, iron oxide red, and iron oxide black. These reagents are commercially available or synthesized using conventional methods. For example, carbon black and 4-(2-methylbutenyl)benzoic acid are available from Aladdin Reagents, iron oxide red from Hubei Weideli Chemical Reagent Co., Ltd., and iron oxide black from Xinxiang Shuangqing Pigment Co., Ltd.

[0011] Furthermore, the liquid alcohol substance satisfies at least one of the following:

[0012] A. The liquid alcohols comprise liquid alcohols having a boiling point of 75–235°C under standard atmospheric pressure; preferably, they comprise monohydric alcohols having a boiling point of 105–225°C under standard atmospheric pressure.

[0013] B. The liquid alcohol comprises one or more of ethanol, n-decanol, n-butanol, isobutanol, n-hexanol, citronellol, ethylene glycol, and geraniol; preferably, the liquid alcohol comprises one or more of n-butanol, isobutanol, n-hexanol, citronellol, and ethylene glycol. These liquid alcohols are all available from Aladdin Reagents.

[0014] Furthermore, the polymethyl methacrylate (PMMA) base material comprises PMMA with a viscosity-average molecular weight of 8,000 to 18,000, preferably PMMA with a viscosity-average molecular weight of 10,000 to 15,000. Preferably, products such as HD01, HD03, HD04, and SF01 provided by Wanhua Chemical Group Co., Ltd. are used.

[0015] Furthermore, the polymethyl methacrylate composition also includes other additives.

[0016] Furthermore, the other additives include one or more of toughening agents, lubricants, antioxidants, and light stabilizers.

[0017] In some preferred embodiments, the other additives include toughening agents; preferably, the mass ratio of the toughening agent to the polymethyl methacrylate composition is 0–40.13:59.2–97.79.

[0018] Preferably, the toughening agent comprises a copolymer formed mainly of one or more monomers selected from methacrylate, acrylonitrile, styrene, and butadiene, or a copolymer formed mainly of one or more monomers selected from acrylate, acrylonitrile, styrene, and butadiene; more preferably, the toughening agent comprises one or more of ABS powder, MBS powder, SBS powder, and ASA powder.

[0019] Among them, methacrylates can be, but are not limited to, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, etc.

[0020] Acrylates can include, but are not limited to, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, etc.

[0021] ABS resin is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S). The relative contents of the three monomers can be varied to produce various types of adhesive powder.

[0022] MBS adhesive powder is a copolymer of butadiene, styrene, and methyl methacrylate. The relative contents of the three monomers can be varied to produce various types of adhesive powder.

[0023] SBS adhesive powder is a copolymer of butadiene and styrene. The relative contents of the two monomers can be varied to produce various types of adhesive powder.

[0024] ASA adhesive powder is made by copolymerizing butyl acrylate, styrene, and acrylonitrile. The ratio of the three monomers can be varied to produce various types of adhesive powder.

[0025] In some preferred embodiments, the other additives include lubricants; preferably, the mass ratio of the lubricant to the polymethyl methacrylate composition is 0.11–0.53: 59.2–97.79; more preferably, it is 0.18–0.42: 59.2–97.79.

[0026] Preferably, the lubricant comprises one or more of polyethylene glycol, polyethylene wax, and pentaerythritol stearate;

[0027] Preferably, the polymethyl methacrylate composition contains parts by weight of a lubricant.

[0028] These reagents are all commercially available or synthesized using conventional methods. For example, polyethylene glycol can be polyethylene glycol 4000 and / or polyethylene glycol 6000, where polyethylene glycol 4000 is available from Aladdin Reagents and polyethylene glycol 6000 is available from Xingtai Lanxing Technology Co., Ltd. Polyethylene wax is available from Honeywell, and pentaerythritol stearate is available from Aladdin Reagents.

[0029] In some preferred embodiments, the other additives include antioxidants; preferably, the mass ratio of the antioxidant to the polymethyl methacrylate composition is 0.05–0.75: 59.2–97.79; more preferably, it is 0.21–0.42: 59.2–97.79.

[0030] Preferably, the antioxidant includes one or more of the following: antioxidant 1076 (CAS No. 2082-79-3), antioxidant 330 (CAS No. 1709-70-2), antioxidant AO3352 (CAS No. 61167-58-6), antioxidant 1010 (CAS No. 6683-19-8), hydroquinone, and antioxidant 9228 (CAS No. 154862-43-8).

[0031] These reagents can all be purchased commercially or synthesized using conventional methods. For example, antioxidant 1076 can be purchased from BASF, antioxidant 330 from Rheinland, antioxidant AO3352 from Yantai Xintelu, antioxidant 1010 from BASF, and hydroquinone from Solvay.

[0032] In some preferred embodiments, the other additives include light stabilizers; preferably, the mass ratio of the antioxidant to the polymethyl methacrylate composition is 0.15–2.5: 59.2–97.79; more preferably, it is 0.34–1.7: 59.2–97.79.

[0033] Preferably, the light stabilizer includes one or more of 2-hydroxy-4-n-octyloxybenzophenone (UV-531), 2,4-dihydroxybenzophenone, HDPE (high-density polyethylene), and thermoplastic polyester elastomer.

[0034] These reagents can all be commercially available or synthesized using conventional methods. For example, UV-531 can be purchased from BASF, 2,4-dihydroxybenzophenone can be purchased from Nanjing Milan Chemical, HDPE can be HDPE P4808NA provided by SBIC, and thermoplastic polyester elastomer can be TPEE 4069 provided by DuPont.

[0035] The present invention also provides a method for preparing the polymethyl methacrylate composition described above, comprising mixing the components of the polymethyl methacrylate composition, melt extruding, and obtaining the polymethyl methacrylate composition;

[0036] Optionally, the initial temperature of the melt extrusion is 50–230℃, the middle temperature is 210–250℃, the tail temperature is 220–260℃, the tail vacuum is -0.4–-0.98MPa, and the rotation speed is 200–400rpm.

[0037] The present invention also provides a polymethyl methacrylate article comprising any of the polymethyl methacrylate compositions described above or the polymethyl methacrylate compositions described above.

[0038] Polymethyl methacrylate (PMMA) products can be manufactured using conventional injection molding processes.

[0039] The technical solution of this invention has the following advantages:

[0040] 1. The polymethyl methacrylate composition provided by the present invention comprises a polymethyl methacrylate base material, a colorant, and a cleaning agent. The cleaning agent contains a liquid alcohol. The mass ratio of the polymethyl methacrylate base material to the cleaning agent is 59.2–97.79:0.2–0.8; preferably 67.8–88.2:0.32–0.67. By adding a cleaning agent containing a liquid alcohol to the polymethyl methacrylate base material and the colorant and controlling the mass ratio of the polymethyl methacrylate base material to the cleaning agent within a suitable range, the polymethyl methacrylate base material and the colorant form particulate matter during the mixing process, thereby effectively improving the problem of colorant sticking to the wall, effectively shortening the time required for cleaning equipment, and reducing labor costs. In addition, by controlling the mass ratio of the polymethyl methacrylate base material to the cleaning agent within the preferred range, the cleaning effect can be further improved and cleaning time can be saved.

[0041] 2. The polymethyl methacrylate composition provided by this invention utilizes alcohols with boiling points of 105–230°C, particularly monohydric alcohols with boiling points of 105–225°C. These alcohols not only provide suitable viscosity for the colorant to form particles but also undergo transesterification with MMA remaining in the PMMA base material during heating, converting methyl methacrylate into other corresponding acrylates. These acrylates increase the gloss and transparency of the product. Furthermore, the exchanged methanol and excess cleaning agents can be removed using conventional melt extrusion processes and equipment. Among these alcohols, one or more of n-butanol, isobutanol, n-hexanol, and citronellol are particularly effective.

[0042] 3. The polymethyl methacrylate composition provided by the present invention further includes other additives. When processing aids, including toughening agents, are added, the composition can be guaranteed to have excellent mechanical properties and be less prone to cracking. Detailed Implementation

[0043] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0044] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0045] Among them, Wanhua HD01, Wanhua HD03, Wanhua HD04 and Wanhua SF01 are all provided by Wanhua Chemical Group Co., Ltd., with viscosity-average molecular weights of 18,000, 9,000, 8,000 and 13,000, respectively.

[0046] The ABS resin was supplied by Kumho Corporation, with the grade HR181.

[0047] MBS adhesive powder was supplied by Zhongyuan Company, with the grade name M711;

[0048] The SBS adhesive powder was supplied by LG Chem, with the brand name LG411;

[0049] The ASA adhesive powder was supplied by Kumho Corporation, and its grade was CX-5.

[0050] Polyethylene wax, supplied by Honeywell, brand name AC-6A; weight average molecular weight 3000-4000.

[0051] Example 1

[0052] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 1.

[0053] Table 1 Raw materials and their weight proportions

[0054]

[0055] Preparation method: Weigh the raw materials according to the weight proportions in the table, mix them, and then perform melt extrusion. The length-to-diameter ratio of the extruder is 40. The temperatures of the initial section (zones 1-3) are 50℃, 180℃, and 210℃, respectively; the temperatures of the middle section (zones 4-7) are 210℃, 210℃, 220℃, and 220℃, respectively; the temperatures of the tail section (zones 8-10) are 220℃, 220℃, and 220℃, respectively; the die head temperature is 220℃; the vacuum degree of the tail section is -0.4MPa; the screw speed is 200rpm; and the processing capacity is 180kg / h.

[0056] This embodiment provides a method for preparing polymethyl methacrylate (PMMA) products. The PMMA composition is used as raw material for injection molding (injection molding conditions: feeding zone 60℃-80℃; melt temperature 260℃; mold temperature 60℃; holding pressure 150MPa; back pressure 25MPa; screw linear speed 0.6m / s) to obtain the PMMA product.

[0057] Example 2

[0058] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 2.

[0059] Table 2 Raw materials and their weight proportions

[0060]

[0061] Preparation method: Weigh the raw materials according to the weight proportions in the table, mix them, and then perform melt extrusion. The length-to-diameter ratio of the extruder is 40. The temperatures of the initial section (zones 1-3) are 80℃, 180℃, and 210℃, respectively; the temperatures of the middle section (zones 4-7) are 210℃, 220℃, 220℃, and 220℃, respectively; the temperatures of the tail section (zones 8-10) are 230℃, 230℃, and 230℃, respectively; the die head temperature is 235℃; the vacuum degree of the tail section is -0.6MPa; the screw speed is 270rpm; and the processing capacity is 300kg / h.

[0062] This embodiment provides a method for preparing polymethyl methacrylate (PMMA) products, including injection molding using a PMMA composition as raw material (injection molding conditions: feed zone 60℃-80℃; melt temperature 250℃; mold temperature 60℃; holding pressure 130MPa; back pressure 20MPa; screw linear speed 0.6m / s) to obtain PMMA products.

[0063] Example 3

[0064] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 3.

[0065] Table 3 Raw materials and their weight proportions

[0066] type base material Pigment lubricant antioxidants Light stabilizers Cleaning agents raw material Wanhua HD04 Iron oxide red Polyethylene wax AO3352 HDPE P4808NA n-Hexyl alcohol weight 97.79 0.45 0.18 0.42 0.5 0.3

[0067] Preparation method: Weigh the raw materials according to the weight proportions in the table, mix them, and then perform melt extrusion. The length-to-diameter ratio of the extruder is 32. The temperatures of the initial section (zones 1-3) are 120℃, 180℃, and 200℃; the temperatures of the middle section (zones 4-7) are 220℃, 220℃, 230℃, and 240℃; the temperatures of the tail section (zones 8-9) are 240℃ and 240℃; the die head temperature is 250℃; the vacuum degree of the tail section is -0.7MPa; the screw speed is 300rpm; and the processing capacity is 500kg / h.

[0068] This embodiment provides a method for preparing polymethyl methacrylate (PMMA) products, including injection molding using a PMMA composition as raw material (feeding zone 60℃-80℃; melt temperature 245℃; mold temperature 60℃; holding pressure 120MPa; back pressure 23MPa; screw linear speed 0.6m / s) to obtain PMMA products.

[0069] Example 4

[0070] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 4.

[0071] Table 4 Raw materials and their weight proportions

[0072]

[0073] Preparation method: Weigh the raw materials according to the weight proportions in the table, mix them, and then perform melt extrusion. The length-to-diameter ratio of the extruder is 44. The temperatures of the initial section (zones 1-3) are 180℃, 200℃, and 220℃; the temperatures of the middle section (zones 4-7) are 220℃, 230℃, 230℃, and 240℃; the temperatures of the tail section (zones 8-11) are 250℃, 250℃, 260℃, and 260℃; the die head temperature is 260℃; the vacuum degree of the tail section is -0.95MPa; the screw speed is 250rpm; and the processing capacity is 800kg / h.

[0074] This embodiment provides a method for preparing polymethyl methacrylate (PMMA) products, including injection molding using a PMMA composition as raw material (injection molding conditions: feed zone 60℃-80℃; melt temperature 230℃; mold temperature 60℃; holding pressure 130MPa; back pressure 26MPa; screw linear speed 0.6m / s) to obtain PMMA products.

[0075] Example 5

[0076] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 5.

[0077] Table 5 Raw materials and their weight proportions

[0078]

[0079] Preparation method: Weigh the raw materials according to the weight proportions in the table, mix them, and then perform melt extrusion. The length-to-diameter ratio of the extruder is 36. The temperatures of the initial section (zones 1-3) are 180℃, 200℃, and 220℃; the temperatures of the middle section (zones 4-7) are 220℃, 230℃, 230℃, and 240℃; the temperatures of the tail section (zones 8-11) are 250℃, 250℃, 260℃, and 260℃; the die head temperature is 260℃; the vacuum degree of the tail section is -0.98MPa; the screw speed is 250rpm; and the processing capacity is 1500kg / h.

[0080] This embodiment provides a polymethyl methacrylate (PMMA) product, which is produced by injection molding using a PMMA composition as raw material (feeding zone 60℃-80℃; melt temperature 240℃; mold temperature 60℃; holding pressure 135MPa; back pressure 22MPa; screw linear speed 0.6m / s).

[0081] Example 6

[0082] This embodiment provides a polymethyl methacrylate composition and its preparation method, as well as a method for preparing polymethyl methacrylate products, which is basically the same as that in Example 1. The only difference is that the type of detergent in the polymethyl methacrylate composition is different. In this embodiment, n-butanol is replaced with the same mass of ethanol (boiling point 78.32°C).

[0083] Example 7

[0084] This embodiment provides a polymethyl methacrylate composition and its preparation method, as well as a method for preparing polymethyl methacrylate products, which is basically the same as that in Example 1. The only difference is that the type of detergent in the polymethyl methacrylate composition is different. In this embodiment, n-butanol is replaced with the same mass of ethylene glycol (boiling point 197.3°C).

[0085] Example 8

[0086] This embodiment provides a polymethyl methacrylate composition and its preparation method, as well as a method for preparing polymethyl methacrylate products, which is basically the same as that in Example 1. The only difference is that the type of detergent in the polymethyl methacrylate composition is different. In this embodiment, n-butanol is replaced with the same mass of n-decanol (boiling point 232.9°C).

[0087] Example 9

[0088] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 6.

[0089] Table 6 Formula Table

[0090] type base material Pigment Cleaning agents raw material Wanhua HD01 carbon black n-Butanol weight 80.3 4.3 0.8

[0091] The preparation method is the same as in Example 1.

[0092] This embodiment provides a polymethyl methacrylate product, which is basically the same as that in Example 1, except that the polymethyl methacrylate composition of this embodiment is used instead of the polymethyl methacrylate composition of Example 1.

[0093] Example 10

[0094] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 7.

[0095] Table 7 Formula Table

[0096] type base material Pigment Cleaning agents raw material Wanhua HD01 carbon black n-Butanol weight 80.3 4.3 0.47

[0097] The preparation method is the same as in Example 1.

[0098] This embodiment provides a polymethyl methacrylate product, which is basically the same as that in Example 1, except that the polymethyl methacrylate composition of this embodiment is used instead of the polymethyl methacrylate composition of Example 1.

[0099] Example 11

[0100] This embodiment provides a polymethyl methacrylate composition, the raw materials and the weight parts of each raw material are shown in Table 8.

[0101] Table 8 Formula Table

[0102] type base material Pigment Cleaning agents raw material Wanhua HD01 carbon black n-Butanol weight 80.3 4.3 0.2

[0103] The preparation method is the same as in Example 1.

[0104] This embodiment provides a polymethyl methacrylate product, which is basically the same as that in Example 1, except that the polymethyl methacrylate composition of this embodiment is used instead of the polymethyl methacrylate composition of Example 1.

[0105] Comparative Example 1

[0106] This embodiment provides a polymethyl methacrylate composition that is basically the same as that in Example 11, except that n-butanol is not added.

[0107] This embodiment provides a polymethyl methacrylate product, which is basically the same as that in Example 11, except that the polymethyl methacrylate composition of this embodiment is used instead of the polymethyl methacrylate composition of Example 11.

[0108] Comparative Example 2

[0109] This embodiment provides a polymethyl methacrylate composition, which is basically the same as that in Example 2, except that n-butanol is not added.

[0110] This embodiment provides a polymethyl methacrylate product, which is basically the same as that in Example 2, except that the polymethyl methacrylate composition of this embodiment is used instead of the polymethyl methacrylate composition of Example 2.

[0111] Comparative Example 3

[0112] This embodiment provides a polymethyl methacrylate composition, which is basically the same as that in Example 3, except that hexanol is not added.

[0113] This embodiment provides a polymethyl methacrylate product, which is basically the same as that in Example 3, except that the polymethyl methacrylate composition of this embodiment is used instead of the polymethyl methacrylate composition of Example 3.

[0114] Comparative Example 4

[0115] This embodiment provides a polymethyl methacrylate composition that is basically the same as that in Example 4, except that citronellol is not added.

[0116] This embodiment provides a polymethyl methacrylate product, which is basically the same as that in Example 4, except that the polymethyl methacrylate composition of this embodiment is used instead of the polymethyl methacrylate composition of Example 4.

[0117] Experimental Example 1

[0118] Ten tons of polymethyl methacrylate (PMMA) composition were produced according to the various embodiments and comparative examples. After production, the equipment was cleaned. The cleaning process was as follows: After production was stopped, all materials involved in the mixing process were swept out of the mixing equipment. Then, the inner walls and impellers of the equipment were wiped with a white cloth moistened with ethanol until no color residue remained on the cloth. The amount of ethanol used and the cleaning time depended on the amount of residual color powder adhering to the walls. After all the equipment was cleaned, the amount of ethanol used, the number of workers, and the wiping time were recorded. The equipment cleaning time was calculated based on this. The equipment wiping required two people to complete, and the total wiping time for both people was recorded as the cleaning time.

[0119] The results are shown in the table below:

[0120] Table 9 Cleanup Results

[0121] project Cleaning time / hour Ethanol usage / kg Example 1 10 15 Example 2 9.8 14 Example 3 8.5 13 Example 4 10 15 Example 5 9.5 13.5 Example 6 11 15 Example 7 10 15 Example 8 10 15 Example 9 8 15 Example 10 8 15 Example 11 12 16 Comparative Example 1 48 72 Comparative Example 2 25 22 Comparative Example 3 17 21 Comparative Example 4 28 23

[0122] As shown in Table 9, compared to Comparative Examples 1-4 which did not use detergent, the embodiments of the present invention significantly shortened the cleaning time and reduced the amount of ethanol used by adding detergent to the polymethyl methacrylate composition. Comparing Example 1 with Example 6, Example 1 further shortened the cleaning time by using an alcohol within its preferred boiling point range.

[0123] Experimental Example 2

[0124] The transmittance of the polymethyl methacrylate products prepared in each embodiment and comparative example was tested according to ASTM D1003-2007.

[0125] The polymethyl methacrylate products prepared in each embodiment and comparative example were subjected to notched impact strength test. The test method was in accordance with GB / T 1843-2008.

[0126] Table 10 Performance Results

[0127] project Light transmittance Notched impact strength Example 1 35.82％ 3.6 Example 2 14.4％ 4.7 Example 3 91.0％ 2.3 Example 4 24.1％ 4.3 Example 5 35.22％ 3.6 Example 6 32.8％ 3.6 Example 7 32.7％ 3.5 Example 8 35.6％ 3.5 Example 9 35.3％ 3.4 Example 10 36.1％ 3.8 Example 11 33.1％ 3.6 Comparative Example 1 32.4％ 3.4 Comparative Example 2 13.6％ 4.2 Comparative Example 3 90％ 2.0 Comparative Example 4 22.8％ 4.0

[0128] As shown in Table 10, for the same colorant, compared to Comparative Example 1, Examples 1 and 5-11 of the present invention, when using liquid alcohol as a cleaning agent, result in higher light transmittance and impact strength of the product. Compared to Comparative Example 2, Example 2, when using liquid alcohol as a cleaning agent, results in increased light transmittance and increased stamping strength of the product. Compared to Comparative Example 3, Example 3, when using liquid alcohol as a cleaning agent, results in increased light transmittance and increased stamping strength of the product. Compared to Comparative Example 4, Example 4, when using a cleaning agent, results in increased light transmittance and increased stamping strength of the product.

[0129] Compared to Examples 1 and 5-8, Example 6, using a cleaning agent with a relatively low boiling point, has slightly poorer light transmittance, but it is still better than the light transmittance of Comparative Example 1, which did not contain a cleaning agent. Low-boiling-point cleaning agents have little effect on impact strength, but Examples 5 and 8, using high-boiling-point cleaning agents, have slightly poorer light transmittance due to higher residue levels. Example 7, using a diol, has slightly poorer light transmittance, but it is still better than the light transmittance of Comparative Example 1, which did not contain a cleaning agent. Compared to Examples 9 and 11, Example 10 further improves light transmittance and impact strength by controlling the mass ratio of cleaning agent to base material within an optimal range. However, as the amount of cleaning agent used further increases, the light transmittance gradually decreases. In Examples 9 and 11, adding too little or too much cleaning agent will reduce the impact strength of the product.

[0130] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A polymethyl methacrylate composition, characterized in that, The product comprises a polymethyl methacrylate (PMMA) base material, a colorant, and a cleaning agent. The cleaning agent contains a liquid alcohol. The mass ratio of the PMMA base material to the cleaning agent is 80.3~97.79:0.3~0.

8. The liquid alcohol contains a monohydric alcohol with a boiling point of 105~225℃ at standard atmospheric pressure. The mass ratio of the PMMA base material to the colorant is 80.3~97.79:0.16~4.

3. The colorant includes one or more of carbon black, 4-(2-methylbutenyl)benzoic acid, iron oxide red, and iron oxide black. The liquid alcohol contains n-butanol or n-hexanol.

2. The polymethyl methacrylate composition according to claim 1, characterized in that, The mass ratio of the polymethyl methacrylate base material to the colorant is 80.3~97.79:0.45~2.

5.

3. The polymethyl methacrylate composition according to claim 1 or 2, characterized in that, The polymethyl methacrylate base material includes polymethyl methacrylate with a viscosity-average molecular weight of 8,000 to 18,000.

4. The polymethyl methacrylate composition according to claim 3, characterized in that, The polymethyl methacrylate base material includes polymethyl methacrylate with a viscosity-average molecular weight of 10,000 to 15,000.

5. The polymethyl methacrylate composition according to claim 1 or 2, characterized in that, The polymethyl methacrylate composition also includes other additives.

6. The polymethyl methacrylate composition according to claim 5, characterized in that, The other additives include one or more of toughening agents, lubricants, antioxidants, and light stabilizers.

7. The polymethyl methacrylate composition according to claim 6, characterized in that, The mass ratio of the toughening agent to the polymethyl methacrylate composition is 8.12~40.13:80.3~97.79; And / or, the toughening agent includes one or more of ABS powder, MBS powder, SBS powder, and ASA powder; And / or, the mass ratio of the lubricant to the polymethyl methacrylate composition is 0.11~0.53:80.3~97.79; And / or, the lubricant includes one or more of polyethylene glycol, polyethylene wax, and pentaerythritol stearate; And / or, the mass ratio of the antioxidant to the polymethyl methacrylate composition is 0.05~0.75:80.3~97.79; And / or, the antioxidant includes one or more of antioxidant 1076, antioxidant H3311, antioxidant AO3352, antioxidant 1010, and hydroquinone; And / or, the light stabilizer includes one or more of 2-hydroxy-4-n-octyloxybenzophenone, 2,4-dihydroxybenzophenone, HDPEP4808NA, and TPEE 4069.

8. The polymethyl methacrylate composition according to claim 6 or 7, characterized in that, The mass ratio of the lubricant to the polymethyl methacrylate composition is 0.18~0.42:80.3~97.79; And / or, the mass ratio of the antioxidant to the polymethyl methacrylate composition is 0.21~0.42:80.3~97.

79.

9. A method for preparing a polymethyl methacrylate composition according to any one of claims 1-8, characterized in that, This includes mixing the components of a polymethyl methacrylate composition, melting and extruding them to obtain the polymethyl methacrylate composition.

10. The method for preparing the polymethyl methacrylate composition according to claim 9, characterized in that, The initial temperature of the melt extrusion is 50~230℃, the middle temperature is 210~250℃, the tail temperature is 220~260℃, the tail vacuum degree is -0.4~-0.98MPa, and the rotation speed is 200~400rpm.

11. A polymethyl methacrylate product, characterized in that, This includes the polymethyl methacrylate composition according to any one of claims 1-8 or the polymethyl methacrylate composition prepared by the preparation method according to claim 9 or 10.

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