A textured, multi-colored PC-PMMA composite board and its preparation method

Abstract

This invention discloses a textured, multi-colored PC-PMMA composite board and its preparation method, relating to the technical field of textured boards. A textured, multi-colored PC-PMMA composite board includes a PMMA layer and a PC layer. The PC layer comprises PC granules I and a textured color masterbatch. The textured color masterbatch is formed by melt extrusion granulation of at least a carrier resin, a compatibilizer II, and pigments and fillers. Specifically, the carrier resin is a mixture of ABS, PC granules II, and PEC in a mass ratio of (1-3.5):6:(0.5-3). By using a specific ratio of ABS, PC, and PEC as the carrier resin for the textured color masterbatch and controlling a significant difference in melt flow between the textured color masterbatch and the PC layer base material, a clear, smooth, and natural textured effect can be effectively formed. Furthermore, the textured effect is long-lasting, and the problem of the textured effect gradually weakening or even disappearing due to material accumulation and heat buildup in the equipment after prolonged production is also solved.

Description

Technical Field

[0001] This invention relates to the technical field of textured sheet materials, and in particular to a textured multicolor PC-PMMA composite sheet and its preparation method. Background Technology

[0002] Plastic sheets with a flowing, multi-colored texture are widely used in architectural decoration, furniture, advertising, and decorative accessories due to their combination of decorative and functional properties. Currently, these sheets are typically produced using multi-layer co-extrusion, calendering, or injection molding processes. Unique color patterns are created by controlling the melting and flow rates of different color masterbatches. Among these, PC-PMMA composite sheets, combining the impact resistance and toughness of PC with the high gloss and weather resistance of PMMA, and enhanced with flowing textures that mimic natural stone, wood, or abstract art patterns, have become a popular alternative to traditional flowing stone, coated metal sheets, and single-color plastic sheets.

[0003] However, due to the immaturity of existing flow pattern forming technology, coupled with the fact that most flow pattern masterbatches on the market are not fully compatible with the preparation processes of PC-PMMA composite boards, it is difficult to achieve the layered and random flow patterns of natural materials. Especially in the continuous production of large-area boards, repetitive units or harsh and blurred flow pattern boundaries are prone to occur, failing to create a large-area, natural, smooth, and clearly transitioning flow pattern effect. Furthermore, after prolonged production, the flow pattern masterbatches on the market gradually melt with the matrix resin due to factors such as material accumulation and heat buildup in the production equipment, causing the flow pattern effect of the produced boards to gradually weaken or even disappear. Secondly, due to compatibility and weather resistance mismatches between some flow pattern masterbatches and the substrate, the produced boards are prone to flow pattern fading or color migration after long-term use, making it difficult to meet the stringent requirements of long-term outdoor decoration and high-end furniture decorative panels. Summary of the Invention

[0004] In order to create a smooth, natural, and long-lasting natural flow pattern effect on PC-PMMA composite boards, and to ensure that PC-PMMA composite boards with good flow pattern effects can still be produced after a long period of production, this application provides a flow pattern multicolor PC-PMMA composite board and its preparation method.

[0005] Firstly, the technical solution adopted in this application for a textured, multi-colored PC-PMMA composite board is as follows:

[0006] A textured, multi-colored PC-PMMA composite board includes a PMMA layer and a PC layer that are stacked sequentially and formed by multi-layer co-extrusion, wherein the thickness ratio of the PMMA layer to the PC layer is 1:(4-9).

[0007] The PMMA layer comprises the following parts by weight of raw materials:

[0008] 88-92 parts PMMA granules, 6-9 parts compatibilizer I, 0.8-1.2 parts antioxidant, 1.2-1.8 parts light stabilizer I;

[0009] The PC layer comprises the following raw materials by weight:

[0010] 91-97.5 parts PC granules I, 0.5-6 parts flow pattern color masterbatch, 1-1.5 parts antioxidant, 1-1.5 parts light stabilizer I;

[0011] The masterbatch for color flow includes at least a carrier resin, compatibilizer II, pigments and fillers, lubricant, coupling agent and light stabilizer II, and is formed by melt extrusion granulation. The carrier resin is specifically a mixture of ABS, PC granules II and PEC in a mass ratio of (1-3.5):6:(0.5-3). The compatibilizer II is specifically maleic anhydride-grafted ABS. The PEC is specifically a random block copolymer of polyarylate and polycarbonate.

[0012] The melt flow rate of PC granules I is 6-8 g / 10 min under the test conditions of 300℃ / 1.2 kg, and the melt flow rate of PC granules II is 2-3 g / 10 min under the test conditions of 300℃ / 1.2 kg.

[0013] By employing the above technical solution, a specific ratio of ABS, PC, and PEC composition is used as the carrier resin for the flow pattern masterbatch. By controlling a certain melt flow difference between the flow pattern masterbatch and the PC layer base material, a clear, smooth, and natural flow pattern effect can be effectively formed in the PC layer. Furthermore, the flow pattern effect is long-lasting, maintaining its colorfastness, colorfastness, and sharp edges even after prolonged aging. In addition, the resulting flow pattern masterbatch can maintain a good flow pattern effect even after long-term production, solving the problem of the flow pattern effect gradually weakening or even disappearing due to material accumulation and heat buildup in the equipment after prolonged production.

[0014] Optionally, the flow pattern masterbatch includes base color material and flow pattern material of different colors, and the mass ratio of the base color material to the flow pattern material is (6-9):(1-4).

[0015] The base colorant comprises the following raw materials in parts by weight:

[0016] 70-85 parts carrier resin I, 2-4 parts compatibilizer II, 8-12 parts pigment and filler I, 0.8-1 part lubricant, 2.5-4 parts coupling agent, 1.5-3 parts light stabilizer II;

[0017] Wherein, the carrier resin I is a mixture of ABS, PC granules II and PEC mixed in a mass ratio of (2.5-3.5):6:(0.5-1.5);

[0018] The flow-textured material comprises the following raw materials in parts by weight:

[0019] 75-85 parts carrier resin II, 3-5 parts compatibilizer II, 10-15 parts pigments and fillers II, 0.3-0.5 parts lubricant, 3-4 parts coupling agent, 1.5-3 parts light stabilizer II;

[0020] The carrier resin II is a mixture of ABS, PC granules II and PEC in a mass ratio of (0.5-1.5):6:(2.5-3.5).

[0021] Optionally, the flow pattern masterbatch includes base color materials of different colors and flow pattern materials of no less than two colors.

[0022] By adopting the above technical solution, the flow pattern masterbatch can simultaneously form a base color with a large coverage area and a flow pattern effect.

[0023] Optionally, pigment I and pigment II are one or more of titanium dioxide, nano calcium carbonate, carbon black, fast red, phthalocyanine blue, phthalocyanine green, macromolecular red, macromolecular yellow, permanent yellow, permanent violet, and azo red.

[0024] By adopting the above technical solution, not only is the coloring performance high, but the colors are also bright, which is conducive to achieving a bright color flow pattern effect on PC-PMMA composite boards.

[0025] Optionally, the lubricant is a composition of pentaerythritol stearate and polyethylene wax, wherein the mass ratio of pentaerythritol stearate to polyethylene wax is 1:(1-2); the coupling agent is a silane coupling agent; and the light stabilizer II is a composition of UV-P and UV-1577, wherein the mass ratio of UV-P to UV-1577 is 1:(2-4).

[0026] By adopting the above technical solution, using a composition of pentaerythritol stearate and polyethylene wax as a lubricant for the flow pattern masterbatch is beneficial to optimizing the melt flow performance of the masterbatch and improving the flow pattern effect of the PC-PMMA composite board. Secondly, since the pigments and fillers used in the flow pattern masterbatch are mostly a combination of inorganic fillers and some organic pigments, using a silane coupling agent as a coupling agent is beneficial to improving the compatibility of pigments and fillers in the carrier resin, which is beneficial to improving the color fineness and gloss of the flow pattern masterbatch, thereby improving the flow pattern effect of the PC-PMMA composite board. In addition, the composition of UV-P and UV-1577 can synergistically achieve full-band ultraviolet shielding, which is beneficial to improving the aging resistance of the flow pattern masterbatch and ensuring that the subsequent flow pattern effect is not easily discolored or faded due to long-term aging.

[0027] Optionally, the compatibilizer I is a composition of styrene-acrylonitrile copolymer and ethylene-methyl acrylate copolymer, and the mass ratio of the styrene-acrylonitrile copolymer to the ethylene-methyl acrylate copolymer is 1:(1-2); the light stabilizer I is ultraviolet absorber UV-P.

[0028] By adopting the above technical solution, using a composition of styrene-acrylonitrile copolymer and ethylene-methyl acrylate copolymer as compatibilizer I is beneficial to improving the compatibility of the PMMA layer and PC layer, preventing defects caused by poor compatibility at the composite interface during melt co-extrusion, and thus effectively ensuring the mechanical and appearance properties of the PC-PMMA composite board. Furthermore, using UV-P as a light stabilizer in the PMMA and PC layers not only effectively improves the aging resistance of the PMMA and PC layers, but also, the addition of UV-P alone has little impact on the color of the transparent matrix, which is beneficial to ensuring the color performance of the PC-PMMA composite board.

[0029] Optionally, the PMMA layer further includes 0.1-1 parts of a holographic additive, wherein the holographic additive is at least one of brocade powder, opal powder, pearlescent powder, luminescent powder, or glitter powder.

[0030] By adopting the above technical solution, the iridescent additive can achieve a translucent iridescent effect in the PMMA layer. At the same time, combined with the PC layer with a multicolored flow pattern effect, it can achieve a colorful visual effect, which is conducive to further improving the appearance performance of PC-PMMA composite board.

[0031] Secondly, the preparation method of the textured multicolor PC-PMMA composite board provided in this application adopts the following technical solution:

[0032] A method for preparing a textured, multi-colored PC-PMMA composite board includes the following steps:

[0033] By weight, the raw materials for the PMMA layer and the PC layer are weighed separately and placed in a hot air circulating drying oven for 6-8 hours to dry thoroughly. After thorough mixing, PMMA layer mixture and PC layer mixture are obtained. Then, the PMMA layer mixture is sent to the first extruder and the PC layer mixture is sent to the second extruder for compounding and extrusion. The mixture is then collected in the layer distributor through its respective flow channel. The layer distributor then sends the melt of each layer into the die head for co-extrusion according to the proportion of each layer, forming a double-layer composite board with PMMA layer-PC layer arrangement. Finally, the textured multicolor PC-PMMA composite board is obtained by calendering, traction, edge trimming, and fixed-length cutting.

[0034] Optionally, the temperature range of the first extruder is 230-250℃; the temperature of the second extruder is set in three segments: the first segment has a temperature range of 260-275℃, the second segment has a temperature range of 275-285℃, and the third segment has a temperature range of 285-290℃; the temperature range of the die head is 270-275℃.

[0035] By adopting the above technical solution, it is beneficial to ensure that the PMMA layer mixture and the PC layer mixture are fully melted and mixed in the first extruder and the second extruder, respectively. Simultaneously, by setting three gradually increasing temperatures in the second extruder, and using a flow-pattern color masterbatch with a wide melting point range and gradual melting point change, the flow-pattern color masterbatch can exhibit different melting conditions at different extrusion stages, thus facilitating the formation of a colored flow-pattern effect in the PC layer. Furthermore, controlling the die temperature to be maintained at 270-275℃ can suppress excessive heating of the PMMA layer and maintain the fluidity of the PC while extruding the PMMA and PC layers. This not only helps prevent internal stress at the interface due to excessive temperature differences, but also allows the PMMA layer surface to maintain high gloss and light transmittance, further improving the appearance performance of the PC-PMMA composite board.

[0036] Optionally, the extruders 1 and 2 need to adjust their extrusion speeds according to the thickness ratio of the PMMA layer to the PC layer and the melt flow rate of each layer of raw material.

[0037] By adopting the above technical solution, it is possible to effectively ensure that the extrusion speeds of the PMMA layer and the PC layer are matched, which helps to prevent sharkskin patterns or flow lines from forming at the composite interface due to the difference in extrusion speeds between the PMMA layer and the PC layer. This also helps to improve the composite strength of the PMMA layer and the PC layer and improve product quality.

[0038] In summary, the technical solution of this application includes at least one of the following beneficial effects:

[0039] 1. By using a specific ratio of ABS, PC and PEC composition as the carrier resin for the flow pattern masterbatch, and controlling the obvious melt flow difference between the flow pattern masterbatch and the PC layer base material, not only can a clear, smooth and natural flow pattern effect be effectively formed in the PC layer, but the flow pattern effect also has long durability. At the same time, it also solves the problem that the flow pattern effect of the board gradually weakens or even disappears due to the accumulation of material and heat in the equipment after long-term production.

[0040] 2. By adding iridescent additives to the PMMA layer, not only can an iridescent visual effect be formed on the surface of the PC-PMMA composite board, but the flow pattern effect of the PC layer is also not affected, which is conducive to further improving the appearance performance of the PC-PMMA composite board. Attached Figure Description

[0041] Figure 1 This is a cross-sectional view of a textured, multi-colored PC-PMMA composite panel according to Embodiment 1 of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. PMMA layer; 2. PC layer. Detailed Implementation

[0044] The present application will be further described in detail below with reference to the accompanying drawings, preparation examples, embodiments and comparative examples.

[0045] The PMMA granules were specifically purchased from Evonik in Germany, with the brand name ACRYLITE PMMA H12. This brand of PMMA has a melt flow rate of 7.0 g / 10 min (230℃ / 3.8 kg).

[0046] The PC pellets were specifically purchased from Covestro, with the grades being PC ET3117, PC ET3227, and PC 2407. The melt flow rate of PC ET3117 was 6.5 g / 10 min (300℃ / 1.2 kg), that of PC ET3227 was 3 g / 10 min (300℃ / 1.2 kg), and that of PC 2407 was 20 g / 10 min (300℃ / 1.2 kg).

[0047] PEC specifically selects polyester carbonate from Covestro, which is a random block copolymer of polyarylate (bisphenol A phthalate) and polycarbonate, with a glass transition temperature of 160-210℃.

[0048] Both the antioxidants and photooxidants were purchased from Tianjin Lialong.

[0049] The ABS granules were specifically purchased from LG Chem, with the specific grade being ABS XR401. The melt flow rate of this grade is 9 g / 10 min (220℃ / 1.2 kg).

[0050] Preparation Example

[0051]

Preparation Example 2-1

[0052] A flow pattern color masterbatch is produced by melting and granulating a mixture of the following raw materials:

[0053] 8 kg carrier resin, 0.4 kg compatibilizer II, 1 kg pigment and filler, 0.1 kg lubricant, 0.3 kg coupling agent and 0.2 kg light stabilizer II.

[0054] In this preparation example, the carrier resin is specifically a composition of ABS, PC granules II, and PEC, wherein the mass ratio of ABS, PC granules II, and PEC is 2:6:2, that is, it includes 1.6 kg of ABS, 4.8 kg of PC granules II, and 1.6 kg of PEC. Specifically, the PC granules II are selected from grades PC ET3227.

[0055] In this preparation example, compatibilizer II is specifically selected as maleic anhydride-grafted ABS; pigment and filler is specifically a composition of titanium dioxide and phthalocyanine blue, including 0.2 kg of titanium dioxide and 0.8 kg of phthalocyanine blue; lubricant is specifically a composition of pentaerythritol stearate and polyethylene wax, including 0.04 kg of pentaerythritol stearate and 0.06 kg of polyethylene wax; coupling agent is specifically silane coupling agent KH-550; and light stabilizer II is specifically a composition of UV-P and UV-1577, including 0.05 kg of UV-P and 0.15 kg of UV-1577.

[0056]

Preparation Example 2-2

[0057] A flow pattern masterbatch is composed of a mixture of base colorants and flow patternants of different colors, wherein the mass ratio of the base colorants to the flow patternants is 8:2.

[0058] In this preparation example, the base colorant is prepared by melt granulation of the following raw materials:

[0059] 7.6 kg carrier resin I, 0.4 kg compatibilizer II, 1.2 kg pigments and fillers, 0.15 kg lubricant, 0.35 kg coupling agent, and 0.3 kg light stabilizer II.

[0060] The carrier resin I is specifically a composition of ABS, PC granules II, and PEC, wherein the mass ratio of ABS, PC granules II, and PEC is 3.5:6:0.5, which includes 2.45 kg of ABS, 4.2 kg of PC granules II, and 0.35 kg of PEC. Specifically, the PC granules II are selected from grades PC ET3227.

[0061] In the base color formulation of this preparation example, compatibilizer II is specifically selected as maleic anhydride-grafted ABS; pigments and fillers specifically include 0.2 kg titanium dioxide, 0.2 kg nano calcium carbonate, and 0.8 kg carbon black; lubricant specifically includes 0.05 kg pentaerythritol stearate and 0.1 kg polyethylene wax; coupling agent specifically is silane coupling agent KH-550; and light stabilizer II specifically includes 0.1 kg UV-P and 0.2 kg UV-1577.

[0062] In this preparation example, the flow material is prepared by melt granulation of a mixture of the following raw materials:

[0063] 8.5 kg carrier resin, 0.5 kg compatibilizer II, 0.5 kg pigments and fillers, 0.08 kg lubricant, 0.27 kg coupling agent, and 0.15 kg light stabilizer II.

[0064] The carrier resin II is specifically a composition of ABS, PC granules II, and PEC, wherein the mass ratio of ABS, PC granules II, and PEC is 1:6:3, comprising 0.85 kg ABS, 5.1 kg PC granules II, and 2.55 kg PEC. Specifically, the PC granules II are selected from grades PC ET3227.

[0065] In the flow material formulation of this preparation example, compatibilizer II is specifically selected as maleic anhydride-grafted ABS; pigments and fillers specifically include 0.4 kg titanium dioxide and 0.1 kg nano calcium carbonate; lubricant specifically includes 0.04 kg pentaerythritol stearate and 0.04 kg polyethylene wax; coupling agent specifically is silane coupling agent KH-550; and light stabilizer II specifically includes 0.05 kg UV-P and 0.1 kg UV-1577.

[0066]

Preparation Examples 2-3

[0067] A flow pattern masterbatch is composed of a base colorant of different colors, flow pattern material I and flow pattern material II, wherein the mass ratio of the base colorant to the flow pattern material is 6:2:2.

[0068] In this preparation example, the base colorant is the same as that in [Preparation Example 2-2]; the flow texture material I is the same as that in [Preparation Example 2-2]; the difference between flow texture material II and that in [Preparation Example 2-2] lies in the different pigments and fillers.

[0069] Specifically, in the formulation of the flow material II in this preparation example, the pigments and fillers specifically include 0.35 kg of phthalocyanine blue and 0.15 kg of titanium dioxide.

[0070]

Preparation Examples 2-4

[0071] A flow pattern masterbatch, which differs from [Preparation Example 2-1] in that it uses a different carrier resin.

[0072] In this preparation example, the carrier resin is specifically PC granules II. Specifically, the grade of PC granules II selected is PC2407.

[0073]

Preparation Examples 2-5

[0074] A flow pattern masterbatch, which differs from [Preparation Example 2-1] in that the PC granules II in the carrier resin are different.

[0075] In this preparation example, the PC granules II in the carrier resin are specifically selected from grades PC 2047.

[0076]

Preparation Examples 2-6

[0077] A flow pattern masterbatch, which differs from [Preparation Example 2-1] in that it does not contain compatibilizer II. Example

[0078]

Example 1

[0079] A textured, multi-colored PC-PMMA composite board, as shown in the reference. Figure 1 The composite board includes a PMMA layer 1 and a PC layer 2 formed by multi-layer co-extrusion and stacked in sequence. In this embodiment, the overall thickness of the PC-PMMA composite board is 1 mm, wherein the thickness of the PMMA layer 1 is 0.1 mm and the thickness of the PC layer 2 is 0.9 mm.

[0080] Specifically, PMMA layer 1 includes the following materials:

[0081] 92kg PMMA granules, 6kg compatibilizer I, 0.8kg antioxidant, 1.2kg light stabilizer I.

[0082] PC layer 2 comprises the following materials:

[0083] 91kg PC granules I, 6kg flow pattern masterbatch, 1.5kg antioxidant, 1.5kg light stabilizer I.

[0084] Among them, the PMMA granules are specifically designated as PMMA H12, the PC granules are specifically designated as PE ET3117, and the flow pattern masterbatch is specifically selected from the flow pattern masterbatch prepared in [Preparation Example 2-1].

[0085] Specifically, compatibilizer I is a composition of styrene-acrylonitrile copolymer and ethylene-methyl acrylate copolymer, and includes 3 kg of styrene-acrylonitrile copolymer and 3 kg of ethylene-methyl acrylate copolymer.

[0086] Specifically, the antioxidant is a composition of antioxidant 1010 and antioxidant 168, wherein the antioxidant in PMMA layer 1 includes 0.2 kg of antioxidant 1010 and 0.6 kg of antioxidant 168, and the antioxidant in PC layer 2 includes 0.5 kg of antioxidant 1010 and 1 kg of antioxidant 168.

[0087] Among them, light stabilizer I is ultraviolet absorber UV-P.

[0088] A method for preparing a textured, multi-colored PC-PMMA composite board includes the following steps:

[0089] By weight, the raw materials of PMMA layer 1 and PC layer 2 are weighed separately and placed in a hot air circulating drying oven for 6 hours to dry thoroughly. After thorough mixing, PMMA layer 1 mixture and PC layer 2 mixture are obtained. Then, PMMA layer 1 mixture is sent to the first extruder and PC layer 2 mixture is sent to the second extruder for compounding and extrusion. The mixtures are then collected in the layer distributor through their respective flow channels. The layer distributor then sends the melt of each layer into the die head for co-extrusion according to the proportion of each layer, forming a double-layer composite board arranged in PMMA layer 1-PC layer 2. Finally, the board is obtained by calendering, traction, edge trimming, and fixed-length cutting.

[0090] In this embodiment, the temperature range of the first extruder is 230-250℃; the temperature of the second extruder is set in three sections: the first section has a temperature range of 260-275℃, the second section has a temperature range of 275-285℃, and the third section has a temperature range of 285-290℃; the temperature range of the die head is 260-280℃. Furthermore, the extrusion speeds of the first and second extruders need to be adjusted according to the thickness ratio of PMMA layer 1 to PC layer 2 and the melt flow rate of each layer's raw material. This reduces the sharkskin pattern or misaligned flow lines that may occur at the composite interface of PMMA layer 1 and PC layer 2 due to differences in extrusion speed, thus ensuring stable bonding of PMMA layer 1 and PC layer 2 and maintaining the appearance performance of the PC-PMMA composite board.

[0091]

Example 2

[0092] A textured, multi-colored PC-PMMA composite board differs from [Example 1] in the thickness of PMMA layer 1 and PC layer 2, as well as the raw materials used for each layer. Specifically, in this embodiment, the overall thickness of the PC-PMMA composite board is 0.5 mm, with PMMA layer 1 having a thickness of 0.1 mm and PC layer 2 having a thickness of 0.4 mm.

[0093] Specifically, PMMA layer 1 includes the following materials:

[0094] 88kg PMMA granules, 9kg compatibilizer I, 1.2kg antioxidant, 1.8kg light stabilizer I.

[0095] PC layer 2 comprises the following materials:

[0096] 95kg PC granules I, 3kg flow pattern masterbatch, 1kg antioxidant, 1kg light stabilizer I.

[0097] Among them, the PMMA granules are specifically designated as PMMA H12, the PC granules are specifically designated as PE ET3117, and the flow pattern masterbatch is specifically selected from the flow pattern masterbatch prepared in [Preparation Example 2-1].

[0098] Specifically, compatibilizer I is a composition of styrene-acrylonitrile copolymer and ethylene-methyl acrylate copolymer, and includes 3 kg of styrene-acrylonitrile copolymer and 6 kg of ethylene-methyl acrylate copolymer.

[0099] Specifically, the antioxidant is a composition of antioxidant 1010 and antioxidant 168, wherein the antioxidant in PMMA layer 1 includes 0.4 kg of antioxidant 1010 and 0.8 kg of antioxidant 168, and the antioxidant in PC layer 2 includes 0.25 kg of antioxidant 1010 and 0.75 kg of antioxidant 168.

[0100] Among them, light stabilizer I is ultraviolet absorber UV-P.

[0101] A method for preparing a textured, multi-colored PC-PMMA composite board is the same as the method in [Example 1].

[0102]

Example 3

[0103] A textured, multi-colored PC-PMMA composite board differs from [Example 1] in that the raw material used for the PC layer 2 is different.

[0104] In this embodiment, the flow pattern masterbatch in PC layer 2 is specifically selected from the flow pattern masterbatch prepared in [Preparation Example 2-2].

[0105]

Example 4

[0106] A textured, multi-colored PC-PMMA composite board differs from [Example 1] in that the raw material used for the PC layer 2 is different.

[0107] In this embodiment, the flow pattern masterbatch in PC layer 2 is specifically selected from the flow pattern masterbatch prepared in [Preparation Examples 2-3].

[0108]

Example 5

[0109] A textured, multi-colored PC-PMMA composite board differs from [Example 2] in that the PMMA layer 1 uses different raw materials.

[0110] In this embodiment, PMMA layer 1 comprises the following raw materials:

[0111] 91kg PMMA granules, 6kg compatibilizer I, 0.8kg antioxidant, 1.2kg light stabilizer I, 1kg iridescent additive.

[0112] The iridescent additive is specifically brocade powder.

[0113] Comparative Example

[0114] Comparative Example 1

[0115] A PC-PMMA composite board differs from [Example 1] in that the masterbatch material in the PC layer 2 is different.

[0116] In this comparative example, the flow pattern masterbatch was specifically selected from the flow pattern masterbatch prepared in [Preparation Examples 2-4].

[0117] Comparative Example 2

[0118] A PC-PMMA composite board differs from [Example 1] in that the masterbatch material in the PC layer 2 is different.

[0119] In this comparative example, the flow pattern masterbatch was specifically selected from the flow pattern masterbatch prepared in [Preparation Examples 2-5].

[0120] Comparative Example 3

[0121] A PC-PMMA composite board differs from [Example 1] in that the masterbatch material in the PC layer 2 is different.

[0122] In this comparative example, the flow pattern masterbatch was specifically selected from the flow pattern masterbatch prepared in [Preparation Examples 2-6].

[0123] Performance test data

[0124] 1. Appearance performance: The appearance of the PC-PMMA composite boards prepared in each embodiment and comparative example was directly observed by visual inspection. With PMMA layer 1 as the surface and PC layer 2 as the bottom, the visual effects of surface gloss, composite interface and flow pattern were recorded.

[0125] 2. Durability of flow pattern effect: The automatic cyclic exposure test was carried out in accordance with the provisions of Method A, Cycle No. 1 in Table 3 of GB / T 16422.2-2014 Plastics Laboratory Light Source Exposure Test Method. The film was facing the light source side, and the exposure time was 1000h. After aging, the appearance performance was tested again.

[0126] 3. Stability of Flow Texture Production: After continuous and stable production using the same equipment for 4 hours, the flow texture effect of the PC-PMMA composite boards produced in each example and comparative example was observed visually and compared with that produced after 0.5 hours of stable production. The retention of the flow texture effect was judged and recorded. If the subjective perception of the flow texture effect is not much different, it is recorded as 100%; if the flow texture edge becomes blurred or faded, it is recorded as 75%; if the flow texture edge becomes further blurred or faded, some areas are significantly faded, and the color tends to be uniform, it is recorded as 50%; if the flow texture effect is mostly faded, and the overall color is relatively uniform, it is recorded as 25%; if the flow texture effect completely disappears and the overall color is uniform, it is recorded as 0%.

[0127] Table 1. Partial performance test data of PC-PMMA composite board

[0128]

[0129] Combining [Example 1] and [Comparative Examples 1]-[Comparative Examples 3] with the data in Table 1, it can be seen that by using a composition of ABS, PC and PEC mixed in a specific ratio as the carrier resin of the flow pattern masterbatch, and in combination with specific compatibilizers, conventional pigments and fillers and other processing aids, a clear flow pattern effect can be effectively formed in the PC layer 2. Moreover, after long-term aging treatment, the flow pattern effect of the board can still maintain a clear color, without fading, discoloration, or blurring of the edges. In addition, after long-term production extrusion, the extruded board can still maintain a good flow pattern effect.

[0130] This is likely because the key to generating flow patterns lies in the fluidity and melting properties between the flow pattern masterbatch and the substrate material. Firstly, as shown in Example 1 and Comparative Example 1, when using PC material with only fluidity differences as the carrier resin for the flow pattern masterbatch, its melting point is close to that of the substrate material in PC layer 2, making it difficult to achieve a gradual melting effect. Furthermore, the high fluidity of the flow pattern masterbatch means it easily melts completely during the mixing and extrusion stage and mixes with the PC granules in PC layer 2, resulting in a uniform light blue extruded substrate that does not produce a flow pattern effect. Secondly, as shown in Example 1 and Comparative Example 2, when using a composition of ABS, PC, and PEC with different melting points as the carrier resin, but replacing an equal amount of PC granules in the carrier resin with PC granules having a higher melt index, the flow pattern effect on the extruded substrate is poor, and the retention rate of the flow pattern effect decreases significantly after prolonged extrusion. This indicates that a high melt flow rate easily leads to the flow pattern effect fading or even disappearing during prolonged extrusion. Furthermore, as can be seen from Example 1 and Comparative Example 3, when no compatibilizer is added to the flow pattern masterbatch, the flow pattern effect of the extruded sheet is similar to that of Comparative Example 1, and most of the black spots appear. This is likely because ABS is only partially compatible with PC and PEC, and the compatibility is not good. If no compatibilizer is added, ABS is difficult to fully mix with PC and PEC, which can easily lead to some unmelted particles when the sheet is mixed and extruded in the subsequent process, affecting the overall appearance.

[0131] Combining Examples 1 and 3-5 with the data in Table 1, it can be seen that by controlling the proportions of ABS, PC, and PEC in the base color material and the flow texture material to adjust the melting of the carrier resin, and by using different colored pigments and fillers, the flow texture masterbatch can simultaneously form a base color with a large coverage area and a flow texture effect. Furthermore, by adding a small amount of iridescent additive to PMMA layer 1, PMMA layer 1 can exhibit a certain iridescent effect. Combined with the flow texture effect of PC layer 2, an iridescent flow texture visual effect can be effectively formed during observation, which is beneficial for further improving the appearance performance of the PC-PMMA composite board.

[0132] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A textured, multi-colored PC-PMMA composite board, characterized in that: It includes a PMMA layer (1) and a PC layer (2) that are stacked in sequence and formed by multi-layer co-extrusion; The PMMA layer (1) comprises the following parts by weight of raw materials: 88-92 parts PMMA granules, 6-9 parts compatibilizer I, 0.8-1.2 parts antioxidant, 1.2-1.8 parts light stabilizer I; The PC layer (2) comprises the following parts by weight of raw materials: 91-97.5 parts PC granules I, 0.5-6 parts flow pattern color masterbatch, 1-1.5 parts antioxidant, 1-1.5 parts light stabilizer I; The masterbatch for color flow includes at least a carrier resin, compatibilizer II, pigments and fillers, lubricant, coupling agent and light stabilizer II, and is formed by melt extrusion granulation. The carrier resin is specifically a mixture of ABS, PC granules II and PEC in a mass ratio of (1-3.5):6:(0.5-3). The compatibilizer II is specifically maleic anhydride-grafted ABS. The PEC is specifically a random block copolymer of polyarylate and polycarbonate. The melt flow rate of PC granules I is 5-8 g / 10 min under the test conditions of 300℃ / 1.2 kg, and the melt flow rate of PC granules II is 2-4 g / 10 min under the test conditions of 300℃ / 1.2 kg.

2. The textured multicolor PC-PMMA composite board according to claim 1, characterized in that: The flow pattern masterbatch includes base colorants and flow patternants of different colors, and the mass ratio of the base colorant to the flow patternant is (6-9):(1-4). The base colorant comprises the following raw materials in parts by weight: 70-85 parts carrier resin I, 2-4 parts compatibilizer II, 8-12 parts pigment and filler I, 0.8-1 part lubricant, 2.5-4 parts coupling agent, 1.5-3 parts light stabilizer II; Wherein, the carrier resin I is a mixture of ABS, PC granules II and PEC mixed in a mass ratio of (2.5-3.5):6:(0.5-1.5); The flow-textured material comprises the following raw materials in parts by weight: 75-85 parts carrier resin II, 3-5 parts compatibilizer II, 10-15 parts pigments and fillers II, 0.3-0.5 parts lubricant, 3-4 parts coupling agent, 1.5-3 parts light stabilizer II; The carrier resin II is a mixture of ABS, PC granules II and PEC in a mass ratio of (0.5-1.5):6:(2.5-3.5).

3. The textured multicolor PC-PMMA composite board according to claim 2, characterized in that: The flow pattern masterbatch includes base color materials of different colors and flow pattern materials of no less than two colors.

4. The textured multicolor PC-PMMA composite board according to claim 2, characterized in that: The pigment filler I and the pigment filler II are one or more of the following: titanium dioxide, nano calcium carbonate, carbon black, fast red, phthalocyanine blue, phthalocyanine green, macromolecular red, macromolecular yellow, permanent yellow, permanent violet, and azo red.

5. The textured multicolor PC-PMMA composite board according to claim 4, characterized in that: The lubricant is specifically a composition of pentaerythritol stearate and polyethylene wax, and the mass ratio of pentaerythritol stearate to polyethylene wax is 1:(1-2); the coupling agent is a silane coupling agent; the light stabilizer II is a composition of UV-P and UV-1577, and the mass ratio of UV-P to UV-1577 is 1:(2-4).

6. A textured, multi-colored PC-PMMA composite board according to any one of claims 1-5, characterized in that: The compatibilizer I is a composition of styrene-acrylonitrile copolymer and ethylene-methyl acrylate copolymer, and the mass ratio of the styrene-acrylonitrile copolymer to the ethylene-methyl acrylate copolymer is 1:(1-2); the light stabilizer I is ultraviolet absorber UV-P.

7. A textured, multi-colored PC-PMMA composite board according to any one of claims 1-5, characterized in that: The PMMA layer (1) also includes 0.1-1 parts of iridescent additive, which is at least one of brocade powder, opal powder, pearl powder, luminescent powder, and glitter powder.

8. A method for preparing a textured, multi-colored PC-PMMA composite board as described in any one of claims 1-7, characterized in that, Includes the following steps: By mass, the raw materials of PMMA layer (1) and PC layer (2) are weighed separately and placed in a hot air circulating drying oven for 6-8 hours to dry fully. After thorough mixing, PMMA layer (1) mixture and PC layer (2) mixture are obtained. Then, PMMA layer (1) mixture is sent to the first extruder and PC layer (2) mixture is sent to the second extruder for mixing and extrusion. They are then collected in the layer distributor through their respective flow channels. The layer distributor sends the melt of each layer into the die head for co-extrusion according to the proportion of each layer to form a double-layer composite board arranged in PMMA layer (1)-PC layer (2). Finally, the flow pattern multicolor PC-PMMA composite board is obtained by calendering, traction, edge trimming and fixed length cutting.

9. The method for preparing a textured, multi-colored PC-PMMA composite board according to claim 8, characterized in that: The temperature range of the first extruder is 230-250℃; the temperature of the second extruder is set in three sections: the first section has a temperature range of 260-275℃, the second section has a temperature range of 275-285℃, and the third section has a temperature range of 285-290℃; the temperature range of the die head is 270-275℃.

10. The method for preparing a textured, multi-colored PC-PMMA composite board according to claim 8, characterized in that: The first extruder and the second extruder need to adjust the extrusion speed according to the thickness ratio of PMMA layer (1) to PC layer (2) and the melt flow rate of each layer of raw material.

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