PC / ABS spot spraying-free material for projector shell containing PCR and preparation method thereof

Abstract

The invention relates to the field of spraying-free plastic materials, and particularly discloses a PC / ABS spot spraying-free material for a projector shell containing PCR and a preparation method of the PC / ABS spot spraying-free material. According to the spraying-free material, o-chlorobenzoyl chloride, the accelerant and hexamethylene diisocyanate are adopted for synergistic interaction, a cross-linked net structure is formed, the mechanical property is improved, spots can be formed on the dyed bishexa-nylon, and the spraying-free material has the advantages that the color fastness is good; the flame retardant, the flexibilizer, the compatilizer and the anti-dripping agent further improve the comprehensive performance of the PC / ABS spot spraying-free material for the projector shell containing PCR. The preparation method provided by the invention comprises the steps of dyeing double hexa-nylon, crushing double hexa-nylon dyed particles, drying, reacting, extruding and granulating the material and the like. The prepared PC / ABS spot spraying-free material is good in mechanical property, suitable for a projector shell, convenient for subsequent processing, relatively simple in process, and beneficial to saving resources, protecting the environment, developing circular economy and reducing the cost.

Description

Technical Field

[0001] The present application relates to the field of spray-free plastic materials, and more specifically, to a PC / ABS spot spray-free material for a projector housing containing PCR and a preparation method thereof. Background Art

[0002] PC refers to polycarbonate, and ABS refers to acrylonitrile-butadiene-styrene copolymer. PC / ABS is a mixture of polycarbonate and acrylonitrile-butadiene-styrene copolymer. It is a thermoplastic plastic made by combining polycarbonate and acrylonitrile-butadiene-styrene copolymer. It combines the excellent properties of the two materials and can be widely used in automotive interior parts, business machines, communication equipment, home appliances and lighting equipment.

[0003] PCR, or Post-Consumer Recycled material, refers to post-consumer recycled plastics. Plastic products are indispensable in life. As the global use of plastic products increases year by year, plastic waste has caused irreversible damage and pollution to the earth's environment. In order to protect the environment, reduce plastic pollution, and reduce carbon emissions, people are paying more and more attention to the use of PCR. Adding recycled materials to virgin materials can meet environmental protection requirements and is an environmentally friendly way to handle PCR.

[0004] After injection molding, plastic products usually need to be sprayed and cured by baking paint to meet the requirements of plastic surface performance and aesthetics. However, paint solvents are volatile, causing great environmental pollution, and most of them are harmful to people's health. Secondly, the spraying defect rate is high, which increases production costs and production cycles. The paint skin of the sprayed products is difficult to remove, resulting in the inability to recycle plastic products and harming the environment. Spray-free plastics are formed in one step, do not require spraying, shorten the production cycle, are environmentally friendly, and meet aesthetic requirements. Spray-free plastics are constantly replacing spray materials in some fields.

[0005] In the related art, PC / ABS spot spray-free materials usually add large-particle minerals, glitter powder, aluminum flakes, etc. to PC / ABS materials, and imitate the appearance of natural marble, starry sky, snowflakes, etc. through design. Due to the addition of large-particle effect powder, poor compatibility and dispersibility with the matrix, the material is prone to produce stress points, which seriously damages the mechanical properties of the material, and the sprinkled effect powder is easy to fall off. In addition, since the performance of PCR is often worse than that of the original new material, the mechanical properties of PC / ABS spot spray-free materials with PCR added are usually worse. Summary of the invention

[0006] In order to improve the problem of poor mechanical properties of PC / ABS spot spray-free materials with added PCR, the present application provides a PC / ABS spot spray-free material for a projector housing containing PCR and a preparation method thereof.

[0007] The present application provides a PC / ABS spot spray-free material for a projector housing containing PCR and a preparation method thereof, which adopts the following technical solutions: In the first aspect, the present application provides a PC / ABS spot spray-free material for a projector housing containing PCR, which adopts the following technical solution: A PC / ABS spot spray-free material for a projector shell containing PCR comprises the following components by weight: 31-43 parts of consumer recycled polycarbonate resin PCR-PC, 25-45 parts of consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, 60-90 parts of polycarbonate resin PC, 24-36 parts of double hexamethylene nylon, 0.2-0.4 parts of pigment, 8-14 parts of o-chlorobenzoyl chloride, 7-13 parts of accelerator, 15-33 parts of hexamethylene diisocyanate, 5-9 parts of flame retardant, 2-9 parts of toughening agent, 6-9 parts of compatibilizer and 0.8-1.2 parts of anti-dripping agent.

[0008] By adopting the above technical scheme, the molecular chains of the consumer recycled polycarbonate resin PCR-PC and the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS are broken, the molecular weight decreases, and the molecular weight distribution becomes wider. In addition, due to the decomposition and oxidation of the groups in the consumer recycled polycarbonate resin PCR-PC and the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, some oxygen-containing groups such as carboxyl, aldehyde, ketone, and hydroxyl groups are generated. Ortho-chlorobenzoyl chloride can react with hydroxyl groups to generate ester groups, and hexamethylene diisocyanate can cross-link with ester groups, nitrile groups, carboxyl groups, etc. under the promotion of accelerators, thereby making the consumer recycled polycarbonate resin PCR-PC, the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and the polycarbonate resin PC cross-linked to form a cross-linked network structure. Double six nylon is an engineering plastic made of polyamide resin, which has the characteristics of good toughness, wear resistance, and high temperature resistance. The melting point of double six nylon is 260-265℃, which is higher than that of PC and ABS. Pigments can dye double six nylon, and the dyed double six nylon is added into the cross-linked network formed by cross-linking of consumer recycled polycarbonate resin PCR-PC, consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and polycarbonate resin PC to form spots. Since o-chlorobenzoyl chloride can replace part of the amide group, double six nylon can also be cross-linked with the nodes of the cross-linked network, thereby making the cross-linked network formed by double six nylon and consumer recycled polycarbonate resin PCR-PC, consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and polycarbonate resin PC have good compatibility, good stability, and the structure is not easily destroyed. Therefore, the mechanical properties of the PC / ABS spot spray-free material for projector housing are improved. Flame retardants, toughening agents, compatibilizers, and anti-dripping agents further improve the comprehensive performance of the PC / ABS spot spray-free material for projector housing containing PCR of the present application, so that the flame retardancy of the PC / ABS spot spray-free material for projector housing meets the standard. Therefore, the PC / ABS spot spray-free material for projector housing containing PCR in this application has good mechanical properties and can meet the standards for producing projector housings; moreover, the flame retardancy of the PC / ABS spot spray-free material for projector housing containing PCR in this application can also meet the standards for producing projector housings. This application reuses the consumer recycled polycarbonate resin PCR-PC and the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS for the production of projector housings, which has good mechanical properties, is conducive to saving resources, protecting the environment, developing a circular economy, and reducing costs.

[0009] Optionally, the flame retardant is a combination of one or more of hydroquinone bis(phenyl phosphate), triphenyl phosphate, and ammonium polyphosphate.

[0010] By adopting the above technical scheme, hydroquinone bis (phenyl phosphate) and triphenyl phosphate have good compatibility with PC and ABS, and have the dual functions of flame retardant and plasticizer, and have the advantages of halogen-free and good stability. The plasticizer function can improve the flow processability of plastic during molding. Ammonium polyphosphate decomposes phosphoric acid, metaphosphoric acid and water when heated, and promotes carbonization to cover the surface of the substrate to play a flame retardant effect. It has the advantages of halogen-free, low toxicity, stability and long-lasting effect.

[0011] Optionally, the toughening agent is a combination of one or more of an organic silicon toughening agent and an epoxy resin.

[0012] By adopting the above technical solution, the organosilicon toughening agent can form a three-dimensional network structure in the polymer matrix, thereby improving the dispersion performance of the polymer and preventing crack propagation. The chemical bond between the organosilicon toughening agent and the polymer matrix can also effectively enhance the mechanical properties of the material, improve the tensile strength, tear resistance and other properties. Furthermore, the organosilicon toughening agent itself has a high energy absorption capacity, and can absorb part of the energy when it is impacted or vibrated, slow down the propagation of stress and improve the toughness of the material. In addition, the organosilicon toughening agent can improve the compatibility between double hexagonal nylon and consumer recycled polycarbonate resin PCR-PC, consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and polycarbonate resin PC, reduce the stress concentration of double hexagonal nylon in the cross-linked network, and reduce the brittleness of the material.

[0013] The glass transition temperature of the silicone component in the silicone toughening agent is -120°C, and the glass transition temperature of the butadiene component in ABS is -80°C. Since the glass transition temperature of the silicone component is lower than that of the butadiene component in ABS, the silicone toughening agent has better low temperature resistance. Epoxy resin contains active epoxy groups, which can undergo a ring-opening reaction with the hydroxyl end groups of PC. While toughening, it has almost no effect on the tensile properties of the material, so that the rigidity and toughness of the material are balanced, and the mechanical properties of PCR are improved.

[0014] Optionally, the toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:(1-2).

[0015] By adopting the above technical solution, the action mechanism of organosilicon toughening agent and epoxy resin toughening is different. When used together, they can increase the intermolecular force, thereby synergizing and further improving the toughening effect. The test found that the weight ratio of organosilicon toughening agent to epoxy resin is 1: (1-2), and the mechanical properties of the material are good.

[0016] Optionally, the compatibilizer is selected from a combination of one or more of methyl methacrylate-butadiene-styrene terblock copolymer and styrene-maleic anhydride copolymer.

[0017] By adopting the above technical solution, the methyl methacrylate-butadiene-styrene ternary block copolymer is a high molecular polymer with a typical "core-shell" structure. It is a ternary copolymer formed by emulsion grafting polymerization of methyl methacrylate, butadiene and styrene. Its core is a rubber phase polymerized from butadiene or butadiene-styrene, and the outer shell is a hard shell layer formed by grafting styrene and methyl methacrylate. Each layer in the unique molecular structure of the methyl methacrylate-butadiene-styrene ternary block copolymer will play a unique function. The methyl methacrylate and styrene shell grafted on the outer shell will have excellent compatibility with consumer recycled polycarbonate resin PCR-PC, consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and polycarbonate resin PC, and can play a good role in increasing the capacity. The butadiene rubber phase of the core layer can play a role in toughening.

[0018] Optionally, the anti-dripping agent is polytetrafluoroethylene; the accelerator is a combination of one or more of N-tert-butyl-2-benzothiazole sulfonamide, dibutyltin dilaurate, triethylamine, and dimethylcyclohexylamine.

[0019] By adopting the above technical solution, polytetrafluoroethylene can be fiberized in plastic processing to play an anti-dripping role, reduce the continuous spread of flames, and thus improve the flame retardant effect of the material. The above-mentioned accelerator can promote the cross-linking reaction between hexamethylene diisocyanate and ester groups, nitrile groups, carboxyl groups and other groups, thereby making the consumer recycled polycarbonate resin PCR-PC, consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and polycarbonate resin PC cross-linked to form a cross-linked network structure.

[0020] In the second aspect, the present application provides a method for preparing a PC / ABS spot spray-free material for a projector housing containing PCR, using the following technical solution: A method for preparing the above-mentioned PC / ABS spot spray-free material for a projector housing containing PCR comprises the following steps: Double six nylon dyeing: heat the double six nylon to 260-265℃, add pigment, mix evenly, extrude and granulate to obtain double six nylon dyed granules; Crushing double hexagonal nylon dyeing particles: crushing double hexagonal nylon dyeing particles into particles to obtain double hexagonal nylon dyeing particles for standby use; drying: drying the consumer recycled polycarbonate resin PCR-PC and polycarbonate resin PC at a temperature of 115-125° C., and drying 25-45 parts of the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS at a temperature of 80-90° C.; reacting: adding double hexagonal nylon dyeing particles, o-chlorobenzoyl chloride, accelerator, hexamethylene diisocyanate, flame retardant, toughening agent, compatibilizer, and anti-dripping agent to the dried consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC, and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and melt-mixing at a temperature of 235-245° C., and reacting in the process of melt-mixing to obtain a mixed reactant; Material extrusion granulation: the mixed reactants are extruded, pulled and granulated to obtain PC / ABS spot spray-free material for projector housing.

[0021] By adopting the above technical scheme, the color of double six nylon after dyeing can be distinguished from that of consumer recycled polycarbonate resin PCR-PC, consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and polycarbonate resin PC, and the particle size of double six nylon dyed particles can be adjusted to a suitable size by crushing the double six nylon dyed particles. The drying step can remove the moisture in the consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC, and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and reduce the influence of moisture on the cross-linking effect. In the reaction step, at a temperature of 235-245°C, the two-color nylon dyed particles will not melt, and stably exist in the cross-linked network system generated by the reaction of consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC, and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, forming a spot effect. The material is extruded and granulated to form particles, which is convenient for subsequent processing into a projector shell. Through the steps of double hexagon nylon dyeing, crushing double hexagon nylon dyeing particles, drying, reaction, material extrusion granulation and other steps, the PC / ABS spot spray-free material has good mechanical properties and is suitable for projector shells. The process is relatively simple, which is beneficial to saving resources, protecting the environment, developing a circular economy and reducing costs.

[0022] Optionally, in the step of crushing the double hexagonal nylon dyeing particles, the particle size of the particles is 100-2500 μm.

[0023] By adopting the above technical solution, when the particle size of the particles is 100-2500μm, the cross-linking system formed by the double hexagonal nylon dyed particles and the consumer recycled polycarbonate resin PCR-PC, consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and polycarbonate resin PC has good compatibility.

[0024] Optionally, in the reaction step, the melt mixing time is 6-8 minutes.

[0025] By adopting the above technical scheme, the melt mixing time is 6-8min, the cross-linking reaction of consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC, and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS is sufficient, and the reaction with o-chlorobenzoyl chloride, accelerator, hexamethylene diisocyanate, flame retardant, toughening agent, compatibilizer, and anti-dripping agent is also sufficient, which is beneficial to improve the mechanical properties of PC / ABS spot spray-free material for projector shell containing PCR.

[0026] Optionally, in the material extrusion granulation step, the extrusion temperature is 220-230° C. and the main engine speed is 190-220 r / min.

[0027] The test found that when the extrusion temperature is 220-230℃ and the main engine speed is 190-220r / min, the mechanical properties of the PC / ABS spot spray-free material for the projector shell containing PCR are good.

[0028] In summary, this application has the following beneficial effects: 1. The present application adopts o-chlorobenzoyl chloride, accelerator, and hexamethylene diisocyanate to synergistically enhance the efficiency, so that the consumer recycled polycarbonate resin PCR-PC, the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and the polycarbonate resin PC form a cross-linked network structure, and the dyed double hexagonal nylon can form spots. The flame retardant, toughening agent, compatibilizer, and anti-dripping agent further improve the comprehensive performance of the projector housing of the present application, so that the PC / ABS spot spray-free material for the projector housing containing PCR in the present application has better mechanical properties.

[0029] 2. The toughening agent in this application preferably adopts a combination of an organosilicon toughening agent and an epoxy resin, and the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:(1-2). Since the organosilicon toughening agent and the epoxy resin have different toughening mechanisms, when used together, they can increase the intermolecular force, thereby synergizing and further improving the toughening effect. The experiment found that the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:(1-2), and the mechanical properties of the material are good.

[0030] 3. The preparation method of the present application, through the steps of double hexagonal nylon dyeing, crushing double hexagonal nylon dyeing particles, drying, reaction, material extrusion granulation and the like, obtains PC / ABS spot spray-free material with good mechanical properties, is suitable for projector housing, is convenient for subsequent processing, has a relatively simple process, is conducive to saving resources, protecting the environment, developing a circular economy, and reducing costs. DETAILED DESCRIPTION

[0031] The present application is described in further detail below.

[0032] Raw materials introduction The following is an introduction to the raw materials.

[0033] Table 1 Raw materials introduction Example

[0034] Example 1 A PC / ABS spot spray-free material for a projector shell containing PCR comprises the following components in parts by weight: 31g of consumer recycled polycarbonate resin PCR-PC, 45g of consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, 60g of polycarbonate resin PC, 36g of double hexamethylene nylon, 0.2g of pigment, 14g of o-chlorobenzoyl chloride, 7g of accelerator, 33g of hexamethylene diisocyanate, 5g of flame retardant, 9g of toughening agent, 6g of compatibilizer and 1.2g of anti-dripping agent.

[0035] The accelerator is N-tert-butyl-2-benzothiazole sulfenamide.

[0036] The flame retardant is hydroquinone bis(phenyl phosphate).

[0037] The toughening agent is a silicone toughening agent.

[0038] The compatibilizer is a combination of methyl methacrylate-butadiene-styrene ternary block copolymer and styrene-maleic anhydride copolymer, and the weight ratio of methyl methacrylate-butadiene-styrene ternary block copolymer and styrene-maleic anhydride copolymer is 1:3.

[0039] The anti-drip agent is polytetrafluoroethylene.

[0040] The method for preparing the PC / ABS spot spray-free material for a projector housing containing PCR comprises the following steps: Double hexagonal nylon dyeing: heat the double hexagonal nylon to 265°C, add pigment, mix evenly, use twin-screw extrusion to granulate, and obtain double hexagonal nylon dyed granules; Crushing the double hexagonal nylon dyeing particles: crushing the double hexagonal nylon dyeing particles into particles with a particle size of 100 μm using a crusher to obtain double hexagonal nylon dyeing particles for later use; Drying: Use a forced air drying oven to dry the recycled polycarbonate resin PCR-PC and polycarbonate resin PC at 125°C for 4 hours, and the recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS at 80°C for 5 hours; Reaction: using a plasticizer, add double hexamethylene dyeing particles, o-chlorobenzoyl chloride, accelerator, hexamethylene diisocyanate, flame retardant, toughening agent, compatibilizer and anti-dripping agent to the dried consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and melt mix them at a temperature of 245°C, and react to obtain a mixed reactant during the melt mixing process; the melt mixing time is 6 minutes.

[0041] Material extrusion granulation: Use a twin-screw extruder to extrude, pull and granulate the mixed reactants. The extrusion temperature is 230° C. and the main engine speed is 190 r / min to obtain PC / ABS spot spray-free material for projector housing.

[0042] Example 2 A PC / ABS spot spray-free material for a projector shell containing PCR comprises the following components in parts by weight: 43g of consumer recycled polycarbonate resin PCR-PC, 25g of consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, 90g of polycarbonate resin PC, 24g of double hexamethylene nylon, 0.4g of pigment, 8g of o-chlorobenzoyl chloride, 13g of accelerator, 15g of hexamethylene diisocyanate, 9g of flame retardant, 2g of toughening agent, 9g of compatibilizer and 0.8g of anti-dripping agent.

[0043] The accelerator is dibutyltin dilaurate.

[0044] The flame retardant is a combination of hydroquinone bis(phenyl phosphate), triphenyl phosphate and ammonium polyphosphate, and the weight ratio of hydroquinone bis(phenyl phosphate), triphenyl phosphate and ammonium polyphosphate is 1:0.5:2.

[0045] The toughening agent is epoxy resin.

[0046] The compatibilizer is styrene-maleic anhydride copolymer.

[0047] The anti-drip agent is polytetrafluoroethylene.

[0048] The method for preparing the PC / ABS spot spray-free material for a projector housing containing PCR comprises the following steps: Double hexagonal nylon dyeing: heat the double hexagonal nylon to 260℃, add pigment, mix evenly, use twin-screw extrusion to granulate, and obtain double hexagonal nylon dyed granules; Crushing the double hexagonal nylon dyeing particles: crushing the double hexagonal nylon dyeing particles into particles with a particle size of 2500 μm using a crusher to obtain double hexagonal nylon dyeing particles for later use; Drying: Use a forced air drying oven to dry the consumer recycled polycarbonate resin PCR-PC and polycarbonate resin PC at a temperature of 115°C for 4 hours, and the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS at a temperature of 90°C for 5 hours; Reaction: Use a plasticizer to add double hexamethylene dyeing particles, o-chlorobenzoyl chloride, accelerator, hexamethylene diisocyanate, flame retardant, toughening agent, compatibilizer and anti-dripping agent to the dried consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and melt mix them at a temperature of 235°C. The mixed reactants are obtained by reaction during the melt mixing process; the melt mixing time is 8 minutes.

[0049] Material extrusion granulation: Use a twin-screw extruder to extrude, pull and granulate the mixed reactants. The extrusion temperature is 220° C. and the main engine speed is 220 r / min to obtain PC / ABS spot spray-free material for projector housing.

[0050] Example 3 A PC / ABS spot spray-free material for a projector shell containing PCR comprises the following components in parts by weight: 37g of consumer recycled polycarbonate resin PCR-PC, 35g of consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, 75g of polycarbonate resin PC, 30g of double hexamethylene nylon, 0.3g of pigment, 11g of o-chlorobenzoyl chloride, 10g of accelerator, 24g of hexamethylene diisocyanate, 7g of flame retardant, 5.5g of toughening agent, 7.5g of compatibilizer and 1.0g of anti-dripping agent.

[0051] The accelerator is N-tert-butyl-2-benzothiazole sulfenamide.

[0052] The flame retardant is a combination of hydroquinone bis(phenyl phosphate) and ammonium polyphosphate, and the weight ratio of hydroquinone bis(phenyl phosphate) to ammonium polyphosphate is 1:1.

[0053] The toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and the ratio of the organosilicon toughening agent to the epoxy resin is 1:3.

[0054] The compatibilizer is a methyl methacrylate-butadiene-styrene ternary block copolymer.

[0055] The anti-drip agent is polytetrafluoroethylene.

[0056] The method for preparing the PC / ABS spot spray-free material for a projector housing containing PCR comprises the following steps: Double hexagonal nylon dyeing: heat the double hexagonal nylon to 262.5℃, add pigment, mix evenly, use twin-screw extrusion to granulate, and obtain double hexagonal nylon dyed granules; Crushing the double hexagonal nylon dyeing particles: crushing the double hexagonal nylon dyeing particles into particles with a particle size of 1300 μm using a crusher to obtain double hexagonal nylon dyeing particles for later use; Drying: Use a forced air drying oven to dry the consumer recycled polycarbonate resin PCR-PC and polycarbonate resin PC at a temperature of 120°C for 4 hours, and the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS at a temperature of 85°C for 5 hours; Reaction: Use a plasticizer to add double hexamethylene dyeing particles, o-chlorobenzoyl chloride, accelerator, hexamethylene diisocyanate, flame retardant, toughening agent, compatibilizer and anti-dripping agent to the dried consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and melt mix them at a temperature of 240°C. The mixed reactants are obtained by reaction during the melt mixing process; the melt mixing time is 7 minutes.

[0057] Material extrusion granulation: Use a twin-screw extruder to extrude, pull and granulate the mixed reactants. The extrusion temperature is 225° C. and the main engine speed is 205 r / min to obtain PC / ABS spot spray-free material for projector housing.

[0058] Example 4 The difference between Example 4 and Example 3 is that the toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:1.

[0059] Example 5 The difference between Example 5 and Example 3 is that the toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:2.

[0060] Example 6 The difference between Example 6 and Example 3 is that the toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:1.5.

[0061] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that in Comparative Example 1, o-chlorobenzoyl chloride is not added.

[0062] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that: Comparative Example 2 does not add N-tert-butyl-2-benzothiazole sulfenamide.

[0063] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that in Comparative Example 3, hexamethylene diisocyanate is not added.

[0064] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that: Comparative Example 4 does not add o-chlorobenzoyl chloride, N-tert-butyl-2-benzothiazole sulfenamide, and hexamethylene diisocyanate.

[0065] Comparative Example 5 A PC / ABS spot spray-free material comprises the following components by weight: 35g acrylonitrile-butadiene-styrene copolymer resin ABS, 112g polycarbonate resin PC, 30.3g glitter powder, 7g flame retardant, 5.5g toughening agent, 7.5g compatibilizer and 1.0g anti-dripping agent.

[0066] The flame retardant is a combination of hydroquinone bis(phenyl phosphate) and ammonium polyphosphate, and the weight ratio of hydroquinone bis(phenyl phosphate) to ammonium polyphosphate is 1:1.

[0067] The toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and the ratio of the organosilicon toughening agent to the epoxy resin is 1:3.

[0068] The compatibilizer is a methyl methacrylate-butadiene-styrene ternary block copolymer.

[0069] The anti-drip agent is polytetrafluoroethylene.

[0070] The above-mentioned method for preparing a PC / ABS spot spray-free material comprises the following steps: Drying: Use a forced air drying oven to dry the polycarbonate resin PC at 120°C for 4 hours, and the acrylonitrile-butadiene-styrene copolymer resin ABS at 85°C for 5 hours; Reaction: Use a plasticizer to add glitter powder, flame retardant, toughening agent, compatibilizer and anti-dripping agent to the dried acrylonitrile-butadiene-styrene copolymer resin ABS and polycarbonate resin PC, and melt mix them at a temperature of 240°C. During the melt mixing process, a mixed reactant is obtained; the melt mixing time is 7 minutes.

[0071] Material extrusion granulation: Use a twin-screw extruder to extrude, pull and granulate the mixed reactants. The extrusion temperature is 225° C. and the main engine speed is 205 r / min to obtain PC / ABS spot spray-free material.

[0072] Performance Testing The PC / ABS spot spray-free material for the projector housing containing PCR of Examples 1-6 and the PC / ABS spot spray-free material of Comparative Examples 1-5 were dried at 100°C for 4 hours, and then injection molded into standard specimens required for various tests using an injection molding machine. The temperature of the injection molding machine was 240°C and the mold temperature was 50°C.

[0073] Melt index: tested according to ASTM D1238; Specific gravity: Tested according to ASTM D792; Tensile strength: tested according to ASTM D638; Elongation: Tested according to ASTM D638; Bending strength: tested according to ASTM D790; Flexural elastic modulus: tested according to ASTM D790; Impact strength: tested according to ASTM D256; Hardness: Tested according to ASTM D785; Heat deformation temperature: Tested according to ASTM D648; Shrinkage: Tested according to ASTM D955; UL combustion grade: Tested in accordance with ANSI / UL94-2003 vertical combustion method test.

[0074] The test conditions are as follows: Table 2 Test conditions Mechanical properties tests such as tensile strength, elongation, flexural strength, flexural elastic modulus, impact strength, and hardness were performed on the PC / ABS spot spray-free materials for projector housings containing PCR in Examples 1-6 and the PC / ABS spot spray-free materials in Comparative Examples 1-5.

[0075] The PC / ABS spot spray-free material for the projector housing containing PCR in Example 3 was tested for performance such as melt index, specific gravity, tensile strength, elongation, flexural strength, flexural elastic modulus, impact strength, hardness, heat deformation temperature, shrinkage, and UL combustion grade.

[0076] The test results are as follows: Table 3 Mechanical properties test results Table 4 Performance test results of Example 3 project Test Results Melt index (g / 10min) 27 proportion 1.18 <![CDATA[Tensile strength (kg / cm 2 )]]> 592 Elongation(%) 25 <![CDATA[Flexural strength (kg / cm 2 )]]> 923 <![CDATA[Flexural modulus of elasticity (kg / cm 2 )]]> 26540 Impact strength (kg-cm / cm) 40 Hardness(RScale) 110 Heat deformation temperature(℃) 80 Shrinkage rate (%) 0.5 UL combustion grade 1.5mm (UL94) V0 UL combustion grade 3.0mm (UL94) V0 It can be seen from Table 3 that the tensile strength, elongation, bending strength, bending elastic modulus, impact strength, hardness and other mechanical properties of Examples 1-6 are all good. This shows that the present application uses PCR to produce PC / ABS spot spray-free material for projector housing, and the obtained PC / ABS spot spray-free material for projector housing containing PCR has good mechanical properties, which is beneficial to saving resources, protecting the environment, developing a circular economy and reducing costs.

[0077] Compared with Example 3, the tensile strength, elongation, bending strength, bending elastic modulus, impact strength, hardness and other mechanical properties of Examples 4-6 are all better, indicating that the toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and when the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:(1-2), the mechanical properties of the PC / ABS spot spray-free material for the projector housing containing PCR are better. This is because the toughening mechanism of the organosilicon toughening agent and the epoxy resin are different. When used together, they can increase the intermolecular force, thereby synergistically enhancing the toughening effect, and further improving the mechanical properties.

[0078] Comparing Example 3 with Comparative Example 1, the various mechanical properties of Example 3 are significantly better than those of Comparative Example 1, indicating that o-chlorobenzoyl chloride plays an important role in improving the mechanical properties of the PC / ABS spot spray-free material for the projector housing containing PCR.

[0079] Comparing Example 3 with Comparative Example 2, the various mechanical properties of Example 3 are significantly better than those of Comparative Example 2, indicating that the accelerator plays an important role in improving the mechanical properties of the PC / ABS spot spray-free material for the projector housing containing PCR.

[0080] Comparing Example 3 with Comparative Example 3, the mechanical properties of Example 3 are significantly better than those of Comparative Example 3, indicating that hexamethylene diisocyanate plays an important role in improving the mechanical properties of PC / ABS spot spray-free material for projector housing containing PCR.

[0081] Comparing Example 3 with Comparative Example 4, the various mechanical properties of Example 3 are significantly better than those of Comparative Example 4, indicating that o-chlorobenzoyl chloride, accelerator, and hexamethylene diisocyanate play an important role in improving the mechanical properties of the PC / ABS spot spray-free material for the projector housing containing PCR.

[0082] In summary, since o-chlorobenzoyl chloride, accelerator, and hexamethylene diisocyanate can synergistically enhance the mechanical properties of PC / ABS spot spray-free materials for projector shells containing PCR. This is because the groups in the consumer recycled polycarbonate resin PCR-PC and the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS decompose and oxidize to generate some oxygen-containing groups, such as carboxyl, aldehyde, ketone, and hydroxyl groups. o-chlorobenzoyl chloride can react with hydroxyl groups to generate ester groups, and hexamethylene diisocyanate can cross-link with ester groups, nitrile groups, carboxyl groups, and other groups under the promotion of accelerators, thereby making the consumer recycled polycarbonate resin PCR-PC, the consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, and the polycarbonate resin PC cross-linked to form a cross-linked network structure, thereby improving the mechanical properties.

[0083] Comparing Example 3 with Comparative Example 5, various mechanical properties of Example 3 are better than those of Comparative Example 5, indicating that the mechanical properties of the PC / ABS spot spray-free material for the projector housing containing PCR in the present application are better than those of the general-purpose PC / ABS spot spray-free material.

[0084] It can be seen from Table 4 that the melt index, specific gravity, tensile strength, elongation, flexural strength, flexural elastic modulus, impact strength, hardness, heat deformation temperature, shrinkage rate, UL combustion and other properties of Example 3 are all good, indicating that the PC / ABS spot spray-free material for the projector housing containing PCR in this application has excellent performance and is suitable for making projector housings.

[0085] The above specific embodiments are merely explanations of the present application and are not limitations of the present application. After reading this specification, those skilled in the art may make modifications to the present application without any creative contribution as needed, but all modifications shall be included in the scope of protection of the present application.

Claims

1. A PC / ABS spot spray-free material for a projector housing containing PCR, characterized in that: The invention comprises the following components by weight: 31-43 parts of consumer recycled polycarbonate resin PCR-PC, 25-45 parts of consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, 60-90 parts of polycarbonate resin PC, 24-36 parts of double hexamethylene nylon, 0.2-0.4 parts of pigment, 8-14 parts of o-chlorobenzoyl chloride, 7-13 parts of accelerator, 15-33 parts of hexamethylene diisocyanate, 5-9 parts of flame retardant, 2-9 parts of toughening agent, 6-9 parts of compatibilizer and 0.8-1.2 parts of anti-dripping agent.

2. The PC / ABS spot spray-free material for projector housing containing PCR according to claim 1, characterized in that: The flame retardant is selected from one or more of hydroquinone bis(phenyl phosphate), triphenyl phosphate, and ammonium polyphosphate.

3. The PC / ABS spot spray-free material for projector housing containing PCR according to claim 1, characterized in that: The toughening agent is selected from a combination of one or more of an organic silicon toughening agent and an epoxy resin.

4. The PC / ABS spot spray-free material for projector housing containing PCR according to claim 3, characterized in that: The toughening agent is a combination of an organosilicon toughening agent and an epoxy resin, and the weight ratio of the organosilicon toughening agent to the epoxy resin is 1:(1-2).

5. The PC / ABS spot spray-free material for projector housing containing PCR according to claim 1, characterized in that: The compatibilizer is selected from a combination of one or more of methyl methacrylate-butadiene-styrene ternary block copolymer and styrene-maleic anhydride copolymer.

6. The PC / ABS spot spray-free material for projector housing containing PCR according to claim 1, characterized in that: The anti-dripping agent is polytetrafluoroethylene; the accelerator is a combination of one or more of N-tert-butyl-2-benzothiazole sulfenamide, dibutyltin dilaurate, triethylamine, and dimethylcyclohexylamine.

7. A method for preparing the PC / ABS spot spray-free material for projector housing containing PCR according to any one of claims 1 to 6, characterized in that: The following steps are included: Double six nylon dyeing: heat the double six nylon to 260-265℃, add pigment, mix evenly, extrude and granulate to obtain double six nylon dyed granules; Crushing the double hexagonal nylon dyeing particles: crushing the double hexagonal nylon dyeing particles into particles to obtain double hexagonal nylon dyeing particles for later use; Drying: Dry the recycled polycarbonate resin PCR-PC and polycarbonate resin PC at 115-125°C, and dry the recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS at 80-90°C; Reaction: adding bis(hexyl) nylon dyeing particles, o-chlorobenzoyl chloride, accelerator, hexamethylene diisocyanate, flame retardant, toughening agent, compatibilizer and anti-dripping agent to dried consumer recycled polycarbonate resin PCR-PC, polycarbonate resin PC and consumer recycled acrylonitrile-butadiene-styrene copolymer resin PCR-ABS, melting and mixing at a temperature of 235-245° C., and reacting in the process of melting and mixing to obtain a mixed reactant; Material extrusion granulation: the mixed reactants are extruded, pulled and granulated to obtain PC / ABS spot spray-free material for projector housing.

8. The method for preparing a PC / ABS spot spray-free material for a projector housing containing PCR according to claim 7, characterized in that: In the step of crushing the double hexagonal nylon dyed particles, the particle size of the particles is 100-2500 μm.

9. The method for preparing a PC / ABS spot spray-free material for a projector housing containing PCR according to claim 7, characterized in that: In the reaction step, the melt mixing time is 6-8 minutes.

10. The method for preparing a PC / ABS spot spray-free material for a projector housing containing PCR according to claim 7, characterized in that: In the material extrusion granulation step, the extrusion temperature is 220-230° C. and the main engine speed is 190-220 r / min.

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