PC composite material with chemical resistance and flame retardance

Abstract

The invention provides a PC (polycarbonate) composite material with chemical resistance and flame retardance, which comprises the following components in parts by weight: 42.8-82.8 parts of polycarbonate (PC); 10 to 50 parts of composite fiber; 5 to 15 parts of a flame retardant; 0.2 to 3 parts of a chemical resistance modifier; and 2-8 parts of an impact modifier. The composite material has the beneficial effects that the composite material does not contain dangerous halogen compounds, the risk of secondary pollution can be reduced when the composite material is recycled, and when the composite material is applied to an electronic product shell, no additional processing or other reinforcing pieces are needed to cover the contact between a barrier material and a solvent, so that the composite material has good environmental chemical resistance, and the service life of the composite material is prolonged. And the material has good mechanical properties and flame retardancy.

Description

Technical field

[0001] The present invention relates to the technical field of PC composite materials, and in particular to a PC composite material with both chemical resistance and flame retardancy. [Background Technology]

[0002] In the manufacturing process of many 3C products, plastic materials are one of the most commonly used, inexpensive and widely used materials. However, in subsequent processing and use in end products, they are often exposed to large amounts of chemical solvents (such as ejector oil, lubricating oil, hinge oil, etc.) due to processing requirements. Therefore, they are prone to physical property degradation under the dual influence of long-term environmental stress and chemical solvents, resulting in defects such as material damage.

[0003] Currently, chemical-resistant plastics used in home appliances and 3C products typically undergo surface treatment before post-processing, or are covered with additional reinforcements made of other materials to protect the plastic from the effects of chemicals. However, this complicates the manufacturing process, significantly increasing the number of steps and costs, and easily leading to defective products and additional costs.

[0004] In view of this, the present invention provides a PC composite material with both chemical resistance and flame retardancy to solve the above problems. [Summary of the invention]

[0005] In order to solve the problems that the chemical-resistant plastic products currently used in home appliances and 3C products have complex production processes, high costs, and are prone to defective products, the present invention provides a PC composite material with both chemical resistance and flame retardancy to solve the above problems.

[0006] The present invention solves the technical problem by providing a PC composite material having both chemical resistance and flame retardancy, comprising the following components in parts by weight:

[0007] Polycarbonate (PC), 42.8 to 82.8 parts;

[0008] Composite fiber, 10-50 parts;

[0009] Flame retardant, 5-15 parts;

[0010] Chemical resistance modifier, 0.2-3 parts;

[0011] Impact modifier, 2 to 8 parts.

[0012] Preferably, the polycarbonate is a composite of two or more of bisphenol A linear polycarbonate, polyester polycarbonate, silicone copolymer polycarbonate, cyclohexane bisphenol A polycarbonate, and polycarbonate synthesized from bisphenol TMC, and the polycarbonate has a melt mass flow rate MI of (3-25) g / 10 min (300°C / 1.2 kg) and an impact strength IS of (15-72) kJ / m 2 , the weight average molecular weight is between 10,000 and 50,000, and the molecular weight distribution is between 1 and 3.

[0013] Preferably, the composite fiber is a combination of one or more of glass fiber, carbon fiber, mineral fiber, and natural plant fiber.

[0014] Preferably, the flame retardant is a compound of a phosphate flame retardant or a sulfonate flame retardant and an organosilicon flame retardant.

[0015] Preferably, the phosphate flame retardant can be selected from one of 1,3-phenylene (2,6-methylphenyl)tetraphosphate, tetraphenylbisphenol A diphosphate and its derivative flame retardant (BDP), tetraphenylresorcinol diphosphate and its derivative (RDP) flame retardant, and triphenyl phosphate (TPP) flame retardant.

[0016] Preferably, the sulfonate flame retardant can be selected from potassium phenylsulfonylbenzenesulfonate (KSS), potassium perfluorobutylsulfonate (PPFBS), and sodium 2,4,5-trichlorobenzenesulfonate (STB).

[0017] Preferably, the organic silicon flame retardant can be selected from one of polysilicon borane and its derivative flame retardants, cross-linked polydimethylsiloxane (PDMS) and its derivative flame retardants.

[0018] Preferably, the chemical resistance modifier is a combination of one or more of a hindered phenol type modifier, a hindered amine type modifier, a phosphite type modifier, an inorganic type modifier, a 4,4-bismethylstyrene type modifier and derivatives thereof.

[0019] Preferably, the impact modifier is a combination of one or more of a core-shell acrylate-PMMA toughening agent, a core-shell acrylate-SAN toughening agent, a core-shell silicone-PMMA toughening agent, a core-shell silicone-SAN toughening agent, a cross-linked methacrylate-methyl methacrylate toughening agent, a maleic anhydride grafted polyurethane toughening agent, a butadiene-styrene-methyl methacrylate toughening agent, and a silicone rubber-methyl methacrylate toughening agent.

[0020] A method for preparing a PC composite material with both chemical resistance and flame retardancy is characterized in that the components are mixed evenly and then put into an extruder for extrusion and granulation. The extruder is a twin-screw extruder, and the processing temperature range of the extruder is set to 260°C to 300°C.

[0021] The beneficial effects of the present invention are: the composite material of the present invention does not contain hazardous halogen compounds, and the risk of secondary pollution can be reduced when recycled and reused. When the composite material is applied to the housing of an electronic product, no additional processing or other reinforcement parts are required to cover the barrier material from contact with the solvent. It has good environmental chemical resistance, and has good mechanical properties and flame retardancy. [Specific implementation method]

[0022] To further illustrate the technical means and effects adopted by the present invention, the following is a detailed description in conjunction with the embodiments of the present invention.

[0023] The present invention provides a PC composite material having both chemical resistance and flame retardancy, comprising the following components in parts by weight:

[0024] Polycarbonate (PC), 42.8 to 82.8 parts;

[0025] Composite fiber, 10-50 parts;

[0026] Flame retardant, 5-15 parts;

[0027] Chemical resistance modifier, 0.2-3 parts;

[0028] Impact modifier, 2 to 8 parts.

[0029] The polycarbonate is a composite of two or more of bisphenol A linear polycarbonate, polyester polycarbonate, silicone copolymer polycarbonate, cyclohexane bisphenol A polycarbonate, and polycarbonate synthesized from bisphenol TMC, and the polycarbonate has a melt mass flow rate MI of (3-25) g / 10 min (300° C. / 1.2 kg) and an impact strength IS of (15-72) kJ / m 2 , the weight average molecular weight is between 10,000 and 50,000, and the molecular weight distribution is between 1 and 3.

[0030] The composite fiber is a combination of one or more of glass fiber, carbon fiber, mineral fiber (silicon dioxide, aluminum oxide, magnesium oxide, basalt fiber, asbestos, etc.), and natural plant fiber (straw stalks, wood chips, bagasse, coffee grounds, etc.).

[0031] The flame retardant is a compound of a phosphate flame retardant or a sulfonate flame retardant and an organosilicon flame retardant.

[0032] Among them, the phosphate flame retardant can be selected from one of 1,3-phenylene (2,6-methylphenyl) tetraphosphate, tetraphenyl bisphenol A diphosphate and its derivative flame retardant (BDP), tetraphenyl resorcinol diphosphate and its derivative (RDP) flame retardant, and triphenyl phosphate (TPP) flame retardant.

[0033] The sulfonate flame retardant may be selected from potassium phenylsulfonylbenzenesulfonate (KSS), potassium perfluorobutylsulfonate (PPFBS), and sodium 2,4,5-trichlorobenzenesulfonate (STB).

[0034] The organic silicon flame retardant can be selected from one of polysilicon borane and its derivative flame retardants, cross-linked polydimethylsiloxane (PDMS) and its derivative flame retardants.

[0035] The chemical resistance modifier is a combination of one or more of hindered phenol type modifiers, hindered amine type modifiers, phosphite type modifiers, inorganic type modifiers, 4,4-bismethylstyrene type modifiers and derivatives thereof.

[0036] The impact modifier is a combination of one or more of a core-shell acrylate-PMMA toughening agent, a core-shell acrylate-SAN toughening agent, a core-shell silicone-PMMA toughening agent, a core-shell silicone-SAN toughening agent, a cross-linked methacrylate-methyl methacrylate toughening agent, a maleic anhydride grafted polyurethane toughening agent, a butadiene-styrene-methyl methacrylate toughening agent, and a silicone rubber-methyl methacrylate toughening agent.

[0037] Example 1

[0038] A PC composite material with both chemical resistance and flame retardancy comprises the following components in parts by weight: 54.2 parts of polycarbonate (PC), 30 parts of composite fiber, 9.8 parts of a flame retardant, 3 parts of a chemical resistance modifier, and 3 parts of an impact modifier.

[0039] The polycarbonate (PC) is a compound of 30 parts of bisphenol A linear polycarbonate and 24.2 parts of cyclohexane bisphenol A polycarbonate, wherein the melt mass flow rate MI of the bisphenol A linear polycarbonate is (4-6) g / 10 min (300°C / 1.2 kg), and the impact strength IS is 60 kJ / m 2 The weight average molecular weight is between 10,000 and 50,000, the molecular weight distribution is between 1 and 3, the melt mass flow rate MI of the cyclohexane bisphenol A polycarbonate is (12 to 19) g / 10 min (300°C / 1.2 kg), and the impact strength IS is 20 kJ / m 2, the weight average molecular weight is between 10,000 and 50,000, and the molecular weight distribution is between 1 and 3.

[0040] Wherein, the composite fiber is a mineral fiber, and the mineral fiber is selected from basalt fiber.

[0041] The flame retardant is a compound of 9 parts of a phosphate flame retardant and 0.8 parts of a silicone flame retardant, wherein the phosphate flame retardant is (1,3-phenylene (2,6-tolyl) tetraphosphate, and the silicone flame retardant is polysilicon borane.

[0042] The chemical-resistant modifier is a compound of 0.5 parts of a hindered phenol-type modifier and 2.5 parts of an inorganic modifier, wherein the hindered phenol-type modifier is BASF 1010 antioxidant and the inorganic modifier is molybdenum disulfide powder.

[0043] Wherein, the impact modifier is a core-shell acrylate-SAN type toughening agent.

[0044] To prepare the PC composite material with both chemical resistance and flame retardancy, the components in corresponding weight parts are weighed according to the above ratio, the components are mixed evenly, and then put into an extruder for extrusion and granulation. The extruder is a twin-screw extruder, and the processing temperature range of the extruder is set to 260°C to 300°C.

[0045] Example 2

[0046] A PC composite material with both chemical resistance and flame retardancy comprises the following components in parts by weight: 54.2 parts of polycarbonate (PC), 30 parts of composite fiber, 9.8 parts of a flame retardant, 3 parts of a chemical resistance modifier, and 3 parts of an impact modifier.

[0047] The polycarbonate (PC) is a compound of 30 parts of bisphenol A linear polycarbonate and 24.2 parts of cyclohexane bisphenol A polycarbonate, and the melt mass flow rate MI of the bisphenol A linear polycarbonate is (4-6) g / 10 min (300°C / 1.2 kg), and the impact strength IS is 60 kJ / m 2 The weight average molecular weight is between 10,000 and 50,000, the molecular weight distribution is between 1 and 3, the melt mass flow rate MI of the cyclohexane bisphenol A polycarbonate is (12 to 19) g / 10 min (300°C / 1.2 kg), and the impact strength IS is 20 kJ / m 2 , the weight average molecular weight is between 10,000 and 50,000, and the molecular weight distribution is between 1 and 3.

[0048] Wherein, the composite fiber is glass fiber.

[0049] The flame retardant is a compound of 9 parts of a phosphate flame retardant and 0.8 parts of a silicone flame retardant, wherein the phosphate flame retardant is (1,3-phenylene (2,6-tolyl) tetraphosphate, and the silicone flame retardant is polysilicon borane.

[0050] The chemical-resistant modifier is a compound of 0.5 parts of a hindered phenol-type modifier and 2.5 parts of an inorganic modifier, wherein the hindered phenol-type modifier is BASF 1010 antioxidant and the inorganic modifier is molybdenum disulfide powder.

[0051] Wherein, the impact modifier is a core-shell acrylate-SAN type toughening agent.

[0052] When preparing the PC composite material with both chemical resistance and flame retardancy, the components in corresponding weight parts are weighed according to the above ratio, the components are mixed evenly, and then put into an extruder for extrusion and granulation. The extruder is a twin-screw extruder, and the processing temperature range of the extruder is set to 260°C to 300°C.

[0053] Example 3

[0054] A PC composite material with both chemical resistance and flame retardancy comprises the following components in parts by weight: 72.4 parts of polycarbonate (PC), 20 parts of composite fiber, 1.6 parts of a flame retardant, 3 parts of a chemical resistance modifier, and 3 parts of an impact modifier.

[0055] The polycarbonate (PC) is a compound of 40 parts of bisphenol A linear polycarbonate and 32.4 parts of cyclohexane bisphenol A polycarbonate, and the melt mass flow rate MI of the bisphenol A linear polycarbonate is (4-6) g / 10 min (300°C / 1.2 kg), and the impact strength IS is 60 kJ / m 2 The weight average molecular weight is between 10,000 and 50,000, the molecular weight distribution is between 1 and 3, the melt mass flow rate MI of the cyclohexane bisphenol A polycarbonate is (12 to 19) g / 10 min (300°C / 1.2 kg), and the impact strength IS is 20 kJ / m 2 , the weight average molecular weight is between 10,000 and 50,000, and the molecular weight distribution is between 1 and 3.

[0056] Wherein, the composite fiber is carbon fiber.

[0057] The flame retardant is a mixture of 0.8 parts of a sulfonate flame retardant and 0.8 parts of an organosilicon flame retardant. The sulfonate flame retardant is potassium perfluorobutylsulfonate (PPFBS), and the organosilicon flame retardant is polysilicon borane.

[0058] The chemical-resistant modifier is a compound of 0.5 parts of a hindered phenol-type modifier and 2.5 parts of an inorganic modifier, wherein the hindered phenol-type modifier is BASF 1010 antioxidant and the inorganic modifier is molybdenum disulfide powder.

[0059] Wherein, the impact modifier is a core-shell acrylate-SAN type toughening agent.

[0060] When preparing the PC composite material with both chemical resistance and flame retardancy, the components in corresponding weight parts are weighed according to the above ratio, the components are mixed evenly, and then put into an extruder for extrusion and granulation. The extruder is a twin-screw extruder, and the processing temperature range of the extruder is set to 260°C to 300°C.

[0061] The particles in Examples 1, 2, and 3 were injection molded into standard test specimens on an injection molding machine. The test specimens were subjected to relevant physical properties and ESC (environmental stress cracking) tests according to the standards. The test results are shown in Table 1:

[0062] Table 1 Test results

[0063]

[0064] The test results of Examples 1, 2, and 3 show that the present invention achieves the preparation of a PC composite material with both chemical resistance and flame retardancy by adding composite fibers, flame retardants, chemical resistance modifiers, and impact modifiers to polycarbonate (PC). The prepared composite material has the following advantages: it does not contain hazardous halogen compounds, which can reduce the risk of secondary pollution when recycled and reused. When the composite material is applied to the housing of an electronic product, no additional processing or other reinforcements are required to cover the barrier material from contact with the solvent, and it can achieve good chemical resistance (elongation greater than 80% and tensile strength greater than 80% after 24 hours of ESC (environmental stress cracking) testing) and good flame retardancy.

[0065] It should be pointed out that the present invention is not limited to the above-mentioned implementation mode, and any simple modification, equivalent change and modification made to the above-mentioned embodiment based on the technical solution of the present invention by any technician familiar with the profession shall fall within the protection scope of the present invention.

Claims

1. A PC composite material with both chemical resistance and flame retardancy, characterized in that: The composition comprises the following components in parts by weight: Polycarbonate (PC), 42.8 to 82.8 parts; Composite fiber, 10-50 parts; Flame retardant, 5-15 parts; Chemical resistance modifier, 0.2-3 parts; Impact modifier, 2 to 8 parts.

2. The PC composite material having both chemical resistance and flame retardancy according to claim 1, characterized in that: The polycarbonate is a composite of two or more of bisphenol A linear polycarbonate, polyester polycarbonate, silicone copolymer polycarbonate, cyclohexane bisphenol A polycarbonate, and polycarbonate synthesized from bisphenol TMC. The polycarbonate has a melt mass flow rate MI of (3-25) g / 10 min (300° C. / 1.2 kg) and an impact strength IS of (15-72) kJ / m 2 , the weight average molecular weight is between 10,000 and 50,000, and the molecular weight distribution is between 1 and 3.

3. The PC composite material having both chemical resistance and flame retardancy according to claim 1, characterized in that: The composite fiber is a combination of one or more of glass fiber, carbon fiber, mineral fiber and natural plant fiber.

4. The PC composite material having both chemical resistance and flame retardancy according to claim 1, wherein: The flame retardant is a compound of one of a phosphate flame retardant or a sulfonate flame retardant and an organosilicon flame retardant.

5. The PC composite material with both chemical resistance and flame retardancy according to claim 4, characterized in that: The phosphate flame retardant can be selected from one of 1,3-phenylene (2,6-methylphenyl) tetraphosphate, tetraphenylbisphenol A diphosphate and its derivative flame retardant (BDP), tetraphenylresorcinol diphosphate and its derivative (RDP) flame retardant, and triphenyl phosphate (TPP) flame retardant.

6. The PC composite material with both chemical resistance and flame retardancy according to claim 4, characterized in that: The sulfonate flame retardant can be selected from potassium phenylsulfonylbenzenesulfonate (KSS), potassium perfluorobutylsulfonate (PPFBS), and sodium 2,4,5-trichlorobenzenesulfonate (STB).

7. The PC composite material with both chemical resistance and flame retardancy according to claim 4, characterized in that: The organic silicon flame retardant can be selected from one of polysilicon borane and its derivative flame retardants, cross-linked polydimethylsiloxane (PDMS) and its derivative flame retardants.

8. The PC composite material with both chemical resistance and flame retardancy according to claim 1, characterized in that: The chemical resistance modifier is a combination of one or more of hindered phenol type modifiers, hindered amine type modifiers, phosphite type modifiers, inorganic type modifiers, 4,4-bismethylstyrene type modifiers and derivatives thereof.

9. The PC composite material with both chemical resistance and flame retardancy according to claim 1, characterized in that: The impact modifier is a combination of one or more of core-shell acrylate-PMMA toughening agents, core-shell acrylate-SAN toughening agents, core-shell silicone-PMMA toughening agents, core-shell silicone-SAN toughening agents, cross-linked methacrylate-methyl methacrylate toughening agents, maleic anhydride grafted polyurethane toughening agents, butadiene-styrene-methyl methacrylate toughening agents, and silicone rubber-methyl methacrylate toughening agents.

10. The method for preparing a PC composite material having both chemical resistance and flame retardancy according to any one of claims 1 to 9, characterized in that: After mixing the components evenly, the mixture is put into an extruder for extrusion and granulation. The extruder is a twin-screw extruder, and the processing temperature range of the extruder is set at 260° C. to 300° C.

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