Polymethyl methacrylate composition, preparation method thereof and polymethyl methacrylate product

Abstract

The invention 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. A cleaning agent containing liquid alcohol substances is added into a polymethyl methacrylate base material and a coloring agent, and the mass ratio of the polymethyl methacrylate base material to the cleaning agent is controlled to be within a proper range, so that the polymethyl methacrylate base material and the coloring agent form granular substances in the mixing process; therefore, the problem that the coloring agent adheres to the wall is effectively solved, the time required for cleaning equipment is effectively shortened, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of polymer material preparation, and in particular to a polymethyl methacrylate composition and a preparation method thereof, and a polymethyl methacrylate product. Background Art

[0002] Polymethyl methacrylate (PMMA) is a high-transmittance polymer material. Due to its transmittance of more than 90%, low haze, easy processing, and easy dyeing, it can be widely used in automobile and motorcycle vehicle lamps, such as vehicle taillights. Most of them are PMMA that has been added with colorants of red, orange and other colors and blended, extruded, granulated, and injection molded to make vehicle taillights. In addition, PMMA can also be mixed with a toughening agent to produce a dyed alloy, which is used as a decorative exterior part for high-end vehicles or other products. Antioxidants, light stabilizers, release agents, and toners are often used in the formulation of PMMA modified materials for headlights. For example, a PMMA composition and its preparation method are introduced in the Chinese patent (CN 117417616A). CN107841077A improves heat resistance by adding SMA resin.

[0003] In the production process of this type of material, PMMA base material, toughening agent, color powder and various additives are usually used to mix evenly, and then fed into a screw extruder through a loss-in-weight scale or a forced feeder, melted and extruded in the extruder, and granulated after cooling to prepare plastic particles. The particles are injection molded into the desired shape. Since colorants are added during the production process of this type of material, as the production time increases and the mixing process releases heat, more colorants will remain in the mixing equipment and conveying pipelines. Once the production is changed or switched, it will cause great difficulties in cleaning the equipment. Usually, the entire set of equipment needs to be disassembled for thorough cleaning, and the cleaning cycle is long, which seriously affects the efficiency of the equipment.

[0004] Therefore, if it is possible to avoid the situation in which a large amount of toner sticks to the wall during the mixing process, thereby improving the problems of difficult equipment cleaning and long cleaning cycle in the current processing process, it is a technical problem that urgently needs 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 the polymethyl methacrylate composition in the prior art.

[0006] The invention provides a polymethyl methacrylate composition, comprising a polymethyl methacrylate base material, a colorant and a detergent, wherein the detergent comprises a liquid alcohol substance, and the mass ratio of the polymethyl methacrylate base material to the detergent 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 the present invention, liquid alcohols can be C1-C 10 One or more of monohydric alcohols or polyhydric alcohols, wherein the H atoms in these alcohols may be replaced by 1 to 3 hydroxyl groups in alkanes, alkenes, alkynes or aromatic hydrocarbons. For example, the liquid alcohol substances include one or more of methanol, ethanol, ethylene glycol, isopropanol, n-butanol, isobutanol, n-hexanol, citronellol, geraniol and n-decanol.

[0008] Polymethyl methacrylate can be synthesized by conventional synthesis methods in the art, or can be purchased commercially.

[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 includes toner; preferably, the colorant includes one or more of carbon black, 4-(2-methylbutenyl)benzoic acid, red iron oxide, and black iron oxide. These reagents can be purchased from the market or synthesized according to conventional methods. For example, carbon black and 4-(2-methylbutenyl)benzoic acid can be purchased from Aladdin Reagent, red iron oxide can be purchased from Hubei Weideli Chemical Reagent Co., Ltd., and black iron oxide can be purchased from Xinxiang Shuangqing Pigment Co., Ltd.

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

[0012] A. The liquid alcohol substance comprises a liquid alcohol substance having a boiling point of 75 to 235° C. under standard atmospheric pressure; preferably, it comprises a monohydric alcohol having a boiling point of 105 to 225° C. under standard atmospheric pressure;

[0013] B. The liquid alcohol substance comprises one or more of ethanol, n-decanol, n-butanol, isobutanol, n-hexanol, citronellol, ethylene glycol, and geraniol; preferably, the liquid alcohol substance comprises one or more of n-butanol, isobutanol, n-hexanol, citronellol, and ethylene glycol. These liquid alcohol substances can be purchased from Aladdin Reagent.

[0014] Further, the polymethyl methacrylate base material includes polymethyl methacrylate with a viscosity average molecular weight of 8000 to 18000, preferably, polymethyl methacrylate with a viscosity average molecular weight of 10000 to 15000. Products HD01, HD03, HD04, SF01, etc. provided by Wanhua Chemical Group Co., Ltd. are preferred.

[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 auxiliary agents include a toughening agent; 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 includes a copolymer mainly formed by copolymerization of one or more monomers of methacrylate, acrylonitrile, styrene, and butadiene, or a copolymer formed by copolymerization of one or more monomers of acrylate, acrylonitrile, styrene, and butadiene; more preferably, the toughening agent includes one or more of ABS rubber powder, MBS rubber powder, SBS rubber powder, and ASA rubber powder;

[0019] The methacrylate may be, but is not limited to, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, and the like.

[0020] The acrylate may be, but is not limited to, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, and the like.

[0021] Among them, ABS resin is a ternary copolymer of acrylonitrile (A), butadiene (B) and styrene (S). The relative content of the three monomers can be changed arbitrarily to make various rubber powders.

[0022] MBS rubber powder is a copolymer of butadiene, styrene and methyl methacrylate. The relative contents of the three monomers can be changed arbitrarily to make various rubber powders.

[0023] SBS rubber powder is a copolymer made from two monomers, butadiene and styrene. The relative content of the two monomers can be changed arbitrarily to make various rubber powders.

[0024] ASA rubber powder is made by copolymerization of butyl acrylate, styrene and acrylonitrile. The proportion of the three monomers can be changed arbitrarily to make various rubber powders.

[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 0.18-0.42:59.2-97.79;

[0026] Preferably, the lubricant includes 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 can be purchased from the market or synthesized according to conventional methods. For example, polyethylene glycol can be polyethylene glycol 4000 and / or polyethylene glycol 6000, wherein polyethylene glycol 4000 can be purchased from Aladdin Reagents, and polyethylene glycol 6000 can be purchased from Xingtai Bluestar Technology Co., Ltd. Polyethylene wax can be purchased from Honeywell, and pentaerythritol stearate can be purchased 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 0.21-0.42:59.2-97.79;

[0030] Preferably, the antioxidant includes one or more of 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 be purchased from the market or synthesized according to conventional methods. For example, antioxidant 1076 can be purchased from BASF, antioxidant 330 can be purchased from Lianlong, antioxidant AO3352 can be purchased from Yantai Xintelu, antioxidant 1010 can be purchased from BASF, and hydroquinone can be purchased from Solvay.

[0032] In some preferred embodiments, the other additives include a light stabilizer; preferably, the mass ratio of the antioxidant to the polymethyl methacrylate composition is 0.15-2.5:59.2-97.79; more preferably 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 be purchased from the market or synthesized according to 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 Sabic, and thermoplastic polyester elastomer can be TPEE 4069 provided by DuPont.

[0035] The present invention also provides a method for preparing any of the above-mentioned polymethyl methacrylate compositions, comprising mixing the components of the polymethyl methacrylate composition, and melt-extruding to obtain the polymethyl methacrylate composition;

[0036] Optionally, the temperature of the initial stage of melt extrusion is 50-230°C, the temperature of the middle stage is 210-250°C, the temperature of the final stage is 220-260°C, the vacuum degree of the final stage is -0.4-0.98MPa, and the rotation speed is 200-400rpm.

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

[0038] Among them, polymethyl methacrylate products can be made through conventional injection molding technology.

[0039] The technical solution of the present 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 detergent, wherein the detergent comprises a liquid alcohol substance, and the mass ratio of the polymethyl methacrylate base material to the detergent is 59.2-97.79:0.2-0.8; preferably 67.8-88.2:0.32-0.67. By adding the detergent comprising the liquid alcohol substance to the polymethyl methacrylate base material and the colorant and controlling the mass ratio of the polymethyl methacrylate base material to the detergent within a suitable range, the polymethyl methacrylate base material and the colorant form a granular substance during the mixing process, thereby effectively improving the problem of the 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 detergent within a preferred range, the cleaning effect can be further improved and the cleaning time can be saved.

[0041] 2. The polymethyl methacrylate composition provided by the present invention adopts alcohols with a boiling point of 105 to 230° C., especially monohydric alcohols with a boiling point of 105 to 225° C. These alcohols not only provide appropriate viscosity for the colorant to form particles, but also undergo an ester exchange reaction with the MMA remaining in the PMMA base material during heating, converting methyl acrylate into corresponding other acrylates, which can increase the gloss and transparency of the product. In addition, the exchanged methanol and excess detergent can be removed from the system through conventional melt extrusion processes and equipment. Among these alcohols, one or more of n-butyl alcohol, isobutyl alcohol, n-hexanol, and citronellol have better effects.

[0042] 3. The polymethyl methacrylate composition provided by the present invention further comprises other additives. When processing additives including toughening agents are added, the mechanical properties of the composition can be ensured to be excellent and not prone to cracking. DETAILED DESCRIPTION

[0043] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0044] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[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] ABS resin is provided by Kumho Corporation, with the brand name HR181;

[0047] MBS rubber powder is provided by Zhongyuan Company, brand name is M711;

[0048] SBS rubber powder is provided by LG Chemical, brand LG411;

[0049] ASA rubber powder is provided by Kumho Corporation, brand name CX-5;

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

[0051] Example 1

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

[0053] Table 1 Raw materials and their weight parts

[0054]

[0055] Preparation method: According to the weight parts in the table, weigh each raw material, mix them and then melt extrude them. The aspect ratio of the extruder is 40. The temperatures of the initial section (zones 1 to 3) are 50°C, 180°C, and 210°C, respectively; the temperatures of the middle section (zones 4 to 7) are 210°C, 210°C, 220°C, and 220°C, respectively; the temperatures of the tail section (8 to 10) are 220°C, 220°C, and 220°C, respectively, and the head temperature is 220°C; the vacuum degree of the tail section is -0.4MPa; the screw speed is 200rpm; the processing capacity is 180kg / h.

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

[0057] Example 2

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

[0059] Table 2 Raw materials and their weight parts

[0060]

[0061] Preparation method: According to the weight parts in the table, weigh each raw material, mix them and then melt extrude them. The aspect ratio of the extruder is 40. The temperatures of the initial section (zones 1 to 3) are 80°C, 180°C, and 210°C, respectively; the temperatures of the middle section (zones 4 to 7) are 210°C, 220°C, 220°C, and 220°C, respectively; the temperatures of the tail section (8 to 10) are 230°C, 230°C, and 230°C, respectively, and the head temperature is 235°C; the vacuum degree of the tail section is -0.6MPa; the screw speed is 270rpm; the processing capacity is 300kg / h.

[0062] The present embodiment provides a method for preparing a polymethyl methacrylate product, comprising: performing injection molding on a polymethyl methacrylate composition as a raw material (injection molding conditions: feeding zone 60°C-80°C; melt temperature 250°C; mold temperature 60°C; holding pressure 130MPa; back pressure 20MPa; screw linear speed 0.6m / s) to obtain a polymethyl methacrylate product.

[0063] Example 3

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

[0065] Table 3 Raw materials and their weight parts

[0066] type Base material Toner Lubricants Antioxidants Light Stabilizer Cleaning Agents raw material Wanhua HD04 Iron oxide red Polyethylene wax AO3352 HDPE P4808NA n-Hexanol Weight 97.79 0.45 0.18 0.42 0.5 0.3

[0067] Preparation method: According to the weight parts in the table, weigh each raw material, mix them and then melt extrude them. The aspect ratio of the extruder is 32. The temperature of the initial section (zones 1 to 3) is 120°C, 180°C, and 200°C; the temperature of the middle section (zones 4 to 7) is 220°C, 220°C, 230°C, and 240°C; the temperature of the tail section (8 to 9) is 240°C and 240°C; the head temperature is 250°C; the vacuum degree of the tail section is -0.7MPa; the screw speed is 300rpm; the processing capacity is 500kg / h.

[0068] The present embodiment provides a method for preparing a polymethyl methacrylate product, comprising: performing injection molding using a polymethyl methacrylate composition as a raw material (feeding zone 60°C-80°C; melt temperature 245°C; mold temperature 60°C; holding pressure 120MPa; back pressure 23MPa; screw linear speed 0.6m / s) to obtain a polymethyl methacrylate product.

[0069] Example 4

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

[0071] Table 4 Raw materials and their weight parts

[0072]

[0073] Preparation method: According to the weight parts in the table, weigh each raw material, mix it and then melt extrude it. The aspect ratio of the extruder is 44. The temperature of the initial section (zones 1 to 3) is 180°C, 200°C, and 220°C; the temperature of the middle section (zones 4 to 7) is 220°C, 230°C, 230°C, and 240°C; the temperature of the tail section (8 to 11) is 250°C, 250°C, 260°C, and 260°C; the head temperature is 260°C; the vacuum degree of the tail section is -0.95MPa; the screw speed is 250rpm; the processing capacity is 800kg / h.

[0074] The present embodiment provides a method for preparing a polymethyl methacrylate product, comprising: performing injection molding using a polymethyl methacrylate composition as a raw material (injection molding conditions: feeding zone 60°C-80°C; melt temperature 230°C; mold temperature 60°C; holding pressure 130MPa; back pressure 26MPa; screw linear speed 0.6m / s) to obtain a polymethyl methacrylate product.

[0075] Example 5

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

[0077] Table 5 Raw materials and their weight parts

[0078]

[0079] Preparation method: According to the weight parts in the table, weigh each raw material, mix them and then melt extrude them. The aspect ratio of the extruder is 36. The temperature of the initial section (zones 1 to 3) is 180°C, 200°C, and 220°C; the temperature of the middle section (zones 4 to 7) is 220°C, 230°C, 230°C, and 240°C; the temperature of the tail section (8 to 11) is 250°C, 250°C, 260°C, and 260°C; the head temperature is 260°C; the vacuum degree of the tail section is -0.98MPa; the screw speed is 250rpm; the processing capacity is 1500kg / h.

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

[0081] Example 6

[0082] This embodiment provides a polymethyl methacrylate composition and a preparation method thereof and a preparation method of a polymethyl methacrylate product, which are basically the same as those in Example 1, except that the type of detergent in the polymethyl methacrylate composition is different. In this embodiment, n-butanol is replaced with ethanol (boiling point 78.32° C.) of the same mass.

[0083] Example 7

[0084] This embodiment provides a polymethyl methacrylate composition and a preparation method thereof and a preparation method of a polymethyl methacrylate product, which are basically the same as those in Example 1, except that the type of detergent in the polymethyl methacrylate composition is different. In this embodiment, n-butanol is replaced with ethylene glycol (boiling point 197.3° C.) of the same mass.

[0085] Example 8

[0086] This embodiment provides a polymethyl methacrylate composition and a preparation method thereof and a preparation method of a polymethyl methacrylate product, which are basically the same as those in Example 1, except that the type of detergent in the polymethyl methacrylate composition is different. In this embodiment, n-butanol is replaced by n-decanol (boiling point 232.9° C.) of the same mass.

[0087] Example 9

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

[0089] Table 6 Recipe

[0090] type Base material Toner 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 that of Example 1.

[0092] This embodiment provides a polymethyl methacrylate product, which is basically the same as that of Embodiment 1, except that the polymethyl methacrylate composition of Embodiment 1 is replaced by the polymethyl methacrylate composition of this embodiment.

[0093] Example 10

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

[0095] Table 7 Recipe

[0096] type Base material Toner 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 that of Example 1.

[0098] This embodiment provides a polymethyl methacrylate product, which is basically the same as that of Embodiment 1, except that the polymethyl methacrylate composition of Embodiment 1 is replaced by the polymethyl methacrylate composition of this embodiment.

[0099] Embodiment 11

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

[0101] Table 8 Recipe

[0102] type Base material Toner 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 that of Example 1.

[0104] This embodiment provides a polymethyl methacrylate product, which is basically the same as that of Embodiment 1, except that the polymethyl methacrylate composition of Embodiment 1 is replaced by the polymethyl methacrylate composition of this embodiment.

[0105] Comparative Example 1

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

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

[0108] Comparative Example 2

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

[0110] This embodiment provides a polymethyl methacrylate product, which is basically the same as that of Embodiment 2, except that the polymethyl methacrylate composition of Embodiment 2 is replaced by the polymethyl methacrylate composition of this embodiment.

[0111] Comparative Example 3

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

[0113] This embodiment provides a polymethyl methacrylate product, which is basically the same as that of Embodiment 3, except that the polymethyl methacrylate composition of Embodiment 3 is replaced by the polymethyl methacrylate composition of this embodiment.

[0114] Comparative Example 4

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

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

[0117] Experimental Example 1

[0118] According to each embodiment and comparative example, 10 tons of polymethyl methacrylate composition was produced, and the equipment was cleaned after the production was completed. The cleaning process was specifically as follows: after stopping production, all the participating materials in the mixing equipment were swept out, and then the inner wall and the blades of the equipment were wiped with a white cloth moistened with ethanol until there was no color mark on the white cloth after the inner wall and the blades were wiped with the white cloth. The amount of ethanol used and the cleaning time depended on the residual amount of the wall-adhering toner. After wiping everything clean, the amount of ethanol used, the number of workers and the wiping time were recorded. The equipment cleaning time was calculated in this way. The equipment wiping requires two people to complete, and the sum of the wiping time of the two people is calculated and recorded as the cleaning time.

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

[0120] Table 9 Cleaning results table

[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 Embodiment 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 with Comparative Examples 1-4 which do not use a cleaning agent, each embodiment of the present invention significantly shortens the cleaning time and reduces the amount of ethanol by adding a cleaning agent to the polymethyl methacrylate composition. Comparing Example 1 with Example 6, it can be seen that Example 1 can further shorten the cleaning time by using an alcohol within the preferred boiling point range.

[0123] Experimental Example 2

[0124] The polymethyl methacrylate products prepared in the examples and comparative examples were tested for light transmittance, and the test method was as follows: refer to ASTM D1003-2007.

[0125] The polymethyl methacrylate products prepared in the examples and comparative examples were subjected to notched impact strength tests, and the test method was as follows: refer to 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 Embodiment 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] It can be seen from Table 10 that for the same colorant, compared with Comparative Example 1, when Examples 1, 5-11 of the present invention use liquid alcohol substances as cleaning agents, the light transmittance of the product becomes larger and the impact strength is high. Compared with Comparative Example 2, Example 2 uses liquid alcohol substances as cleaning agents to increase the light transmittance of the product and improve the punching strength. Compared with Comparative Example 3, Example 3 uses liquid alcohol substances as cleaning agents to increase the light transmittance of the product and improve the punching strength. Compared with Comparative Example 4, Example 4 uses a cleaning agent to increase the light transmittance of the product and improve the punching strength.

[0129] Compared with Examples 1, 5-8, the finished product obtained by Example 6 using a detergent with a relatively low boiling point has a slightly worse light transmittance effect, but is better than the light transmittance effect of Comparative Example 1 without adding a detergent. Low-boiling-point detergents have little effect on impact strength, but Examples 5 and 8 use high-boiling-point detergents, so the light transmittance effect is slightly worse due to the high residue. Example 7 uses diols, and the light transmittance effect is slightly worse, but better than the light transmittance effect of Comparative Example 1 without adding a detergent. Compared with Examples 9 and 11, Example 10 further improves the light transmittance and impact strength by controlling the mass ratio of detergent to base material within a preferred range. However, as the amount of detergent used increases further, the light transmittance will gradually decrease. If the detergent is added too little or too much in Examples 9 and 11, the impact strength of the product will be reduced.

[0130] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A polymethyl methacrylate composition, characterized in that The invention comprises a polymethyl methacrylate base material, a colorant and a detergent, wherein the detergent comprises a liquid alcohol substance, and the mass ratio of the polymethyl methacrylate base material to the detergent is 59.2-97.79:0.2-0.8, and preferably 67.8-88.2:0.32-0.

67.

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 59.2-97.79:0.16-4.3; preferably 67.8-88.2:0.45-2.

5.

3. The polymethyl methacrylate composition according to claim 1 or 2, characterized in that The colorant includes toner; preferably, the colorant includes one or more of carbon black, 4-(2-methylbutenyl)benzoic acid, red iron oxide, and black iron oxide.

4. The polymethyl methacrylate composition according to any one of claims 1 to 3, characterized in that: The liquid alcohol substance satisfies at least one of the following: A. The liquid alcohol substance comprises a liquid alcohol substance having a boiling point of 75 to 235° C. under standard atmospheric pressure; preferably, it comprises a monohydric alcohol having a boiling point of 105 to 225° C. under standard atmospheric pressure; B. The liquid alcohol substance comprises one or more of ethanol, n-decanol, n-butanol, isobutanol, n-hexanol, citronellol, ethylene glycol, and geraniol; preferably, the liquid alcohol substance comprises one or more of n-butanol, isobutanol, n-hexanol, and citronellol.

5. The polymethyl methacrylate composition according to any one of claims 1 to 4, characterized in that: The polymethyl methacrylate base material includes polymethyl methacrylate with a viscosity average molecular weight of 8000 to 18000, and preferably includes polymethyl methacrylate with a viscosity average molecular weight of 10000 to 15000.

6. The polymethyl methacrylate composition according to any one of claims 1 to 5, characterized in that: The polymethyl methacrylate composition also includes other auxiliary agents.

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

8. The polymethyl methacrylate composition according to claim 7, characterized in that The polymethyl methacrylate composition satisfies one or more of the following: (1) The other auxiliary agents include a toughening agent; preferably, the mass ratio of the toughening agent to the polymethyl methacrylate composition is 0-40.13:59.2-97.79; Preferably, the toughening agent includes a copolymer mainly formed by copolymerization of one or more monomers of methacrylate, acrylonitrile, styrene, and butadiene, or a copolymer formed by copolymerization of one or more monomers of acrylate, acrylonitrile, styrene, and butadiene; more preferably, the toughening agent includes one or more of ABS rubber powder, MBS rubber powder, SBS rubber powder, and ASA rubber powder; (2) 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, 0.18-0.42:59.2-97.79; Preferably, the lubricant includes one or more of polyethylene glycol, polyethylene wax, and pentaerythritol stearate; Preferably, the polymethyl methacrylate composition contains parts by weight of a lubricant; (3) 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 0.21-0.42:59.2-97.79; Preferably, the antioxidant includes one or more of antioxidant 1076, antioxidant H3311, antioxidant AO3352, antioxidant 1010, and hydroquinone; (4) 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, 0.34-1.7:59.2-97.79; Preferably, the light stabilizer includes one or more of 2-hydroxy-4-n-octyloxybenzophenone, 2,4-dihydroxybenzophenone, HDPE, and thermoplastic polyester elastomer.

9. A method for preparing the polymethyl methacrylate composition according to any one of claims 1 to 8, characterized in that: The method comprises mixing various components of the polymethyl methacrylate composition, and melt-extruding the mixture to obtain the polymethyl methacrylate composition; Optionally, the temperature of the initial stage of melt extrusion is 50-230°C, the temperature of the middle stage is 210-250°C, the temperature of the final stage is 220-260°C, the vacuum degree of the final stage is -0.4-0.98MPa, and the rotation speed is 200-400rpm.

10. A polymethyl methacrylate product, characterized in that: The invention comprises the polymethyl methacrylate composition according to any one of claims 1 to 8 or the polymethyl methacrylate composition according to claim 9.

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