CN112322014B - Low-temperature-resistant PC alloy material and preparation method thereof - Google Patents

Low-temperature-resistant PC alloy material and preparation method thereof Download PDF

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CN112322014B
CN112322014B CN202011048590.7A CN202011048590A CN112322014B CN 112322014 B CN112322014 B CN 112322014B CN 202011048590 A CN202011048590 A CN 202011048590A CN 112322014 B CN112322014 B CN 112322014B
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parts
alloy material
antioxidant
flame retardant
low temperature
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CN112322014A (en
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董相茂
陈勇文
田征宇
艾军伟
岑茵
佟伟
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Tianjin Kingfa Advanced Materials Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Abstract

The invention provides a low-temperature-resistant PC alloy material and a preparation method thereof, wherein the low-temperature-resistant PC alloy material comprises the following components in parts by weight: 70.0-90.0 parts of PC resin; 25.0-35.0 parts of PBT resin; 5.0-15.0 parts of flame retardant; 2.0-10.0 parts of auxiliary flame retardant; 2.0-15.0 parts of a first toughening agent; 1.0 to 5.0 parts of a second toughening agent; 0.01-2.0 parts of antioxidant; 0.01-1.2 parts of other auxiliary agents. The low-temperature-resistant PC alloy material has excellent low-temperature resistance, and is particularly suitable for occasions with higher requirements on use environment, especially the fields of household appliances, industrial machines and the like which are contacted with greasy dirt and solvents and have requirements on low-temperature toughness.

Description

Low-temperature-resistant PC alloy material and preparation method thereof
Technical Field
The invention belongs to the field of engineering plastics, and particularly relates to a low-temperature-resistant PC alloy material and a preparation method thereof.
Background
Polycarbonate resin is a general engineering plastic and has the advantages of transparency, impact resistance, heat resistance, dimensional stability and the like, but PC also has the problems of large internal stress, solvent intolerance and difficult processing. The PBT resin is a crystalline polymer and has excellent solvent resistance and molding processability. The PBT is added into the PC resin, so that the processing performance and solvent resistance of the PC can be obviously improved; the improvement of the solvent resistance is beneficial to the formation of an interpenetrating network of the PBT, and the solvent resistance of the PC/PBT alloy is greatly improved only when the crystallized PBT resin reaches a certain proportion.
When the flame retardant is applied to shells of household appliances, electric appliances or industrial machines, the flame retardant requirement of V-0 is generally required to be met, in addition, when the flame retardant is used outdoors, the high toughness and low temperature resistance of the material are required, and the toughness or low temperature resistance of the material is greatly reduced by the conventional flame retardant of PC or PBT, so that the application range of the material is limited. In order to compensate the damage of the flame retardant to the toughness of the resin, a toughening agent is usually added to improve the toughness, but a common toughening agent MBS or a common toughening agent EBA-GMA for PBT for PC can seriously influence the flame retardant property of the resin, and the contradiction exists between the flame retardance and the toughness, especially the low-temperature toughness, so that the flame retardance and the toughness are difficult to realize simultaneously.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art, and provides a low-temperature-resistant PC alloy material and a preparation method thereof.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the low-temperature-resistant PC alloy material comprises the following components in parts by weight:
preferably, the low-temperature-resistant PC alloy material comprises the following components in parts by weight:
preferably, the first toughening agent is at least one of methyl methacrylate-butadiene-styrene copolymer, methyl methacrylate-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer, acrylic toughening agent, acrylonitrile-styrene-acrylate copolymer, and silicone rubber graft toughening agent.
More preferably, the first toughening agent is a silicone rubber graft toughening agent, and the volume average particle diameter of the rubber component of the silicone rubber graft toughening agent is 150-1500nm, more preferably 200-1200nm; the content of the rubber component is 5-40%, more preferably 30-40%, and the toughening efficiency can be remarkably improved.
Further preferably, the volume average particle diameter of the rubber component of the silicone rubber graft toughening agent is 300 to 800nm, and impact resistance can be significantly improved.
Preferably, the second toughening agent is a reactive toughening agent, in particular at least one of ethylene-acrylic ester-glycidyl methacrylate terpolymer, maleic anhydride functionalized ethylene-vinyl acetate copolymer, ethylene-octene-glycidyl methacrylate terpolymer, preferably ethylene-octene-glycidyl methacrylate terpolymer.
Preferably, the polycarbonate resin has at least one of aromatic polycarbonates having a viscosity average molecular weight of 10000 to 40000, more preferably 12000 to 25000.
Preferably, the flame retardant is a halogen flame retardant, a phosphorus flame retardant, a siloxane flame retardant, a metal salt flame retardant or a boron-based flame retardant, more preferably a halogen flame retardant, and still more preferably a brominated polycarbonate.
Preferably, the auxiliary flame retardant is antimony white, talcum powder or organic silicon flame retardant synergist, more preferably organic silicon flame retardant synergist, and the use content of the flame retardant and the influence on the toughness of the material, particularly the low-temperature toughness, can be effectively reduced.
Preferably, the antioxidant is in a mass ratio of 1.0: (0.5-1.0) or only the primary antioxidant, wherein the primary antioxidant and the secondary antioxidant are selected from one of an acrylic antioxidant, a phosphite antioxidant or an alkylated monophenol or polyphenol, and an alkylated reaction product of polyphenol and diene.
Preferably, the propylene ester antioxidant is octadecyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate; the phosphite antioxidant is tris (nonylphenyl) phosphite, bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite and distearyl pentaerythritol diphosphite; the alkylated monophenol or polyphenol, the reaction product of alkylation of polyphenol and diene is tetrakis [ methylene (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate) ] methane, the butylated reaction product of p-cresol or dicyclopentadiene, alkylated hydroquinone, hydroxylated thiodiphenyl ether, alkylidenebisphenol, benzyl compound, ester of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) -propionic acid with mono-or polyhydric alcohol, ester of beta- (5-tert-butyl-4-hydroxy-3-methylphenyl) -propionic acid with mono-or polyhydric alcohol, ester of thioalkyl or thioaryl compound or amide of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) -propionic acid.
More preferably, the ester of a thioalkyl or thioaryl compound is distearyl thiopropionate, dilaurylthiopropionate, tricosylthiodipropionate, pentaerythritol-tetrakis [3- (3, 5-di-tert-butyl 4-hydroxyphenyl) propionate.
Further preferably, the primary antioxidant is Chinox1076 and the secondary antioxidant is THANOX 168.
Preferably, the other auxiliary agent is a lubricant and/or an anti-dripping agent. The lubricant is glyceryl stearate, and the anti-dripping agent is AS coated PTFE.
The invention also provides a preparation method of the low-temperature-resistant PC alloy material, which comprises the following steps:
(1) Weighing raw materials according to a formula, and sequentially adding the raw materials into a mixer to be blended until the raw materials are uniform to obtain a premix;
(2) Putting the premix prepared in the step (1) into a double-screw extruder, and carrying out melt mixing, extrusion and granulation in the double-screw extruder to obtain the product;
the length-diameter ratio of the screw of the double screw extruder in the step (2) is (40-45): 1, the temperature of the screw barrel is 250-280 ℃, and the rotating speed of the screw rod is 400-500rpm.
Compared with the prior art, the invention has the following advantages:
according to the invention, the PBT is added into the PC, so that the solvent resistance of the PC is greatly improved, the efficient bromine flame retardant is used, the flame retardant property of the alloy is improved, the V-0 flame retardant grade is improved, the use amount of the bromine flame retardant is reduced by matching with a special organosilicon synergist, and the toughness of the alloy, especially the low-temperature toughness, is less influenced. In addition, the high-efficiency first toughening agent organic silicon is used, so that the high-efficiency toughening effect is achieved, the PC phase in the high-efficiency first toughening agent organic silicon is mainly toughened, the addition amount of the high-efficiency first toughening agent organic silicon is smaller than that of the conventional toughening agent, the influence on the flame retardant property is reduced, and the low-temperature toughness of the material is improved. The second toughening agent ethylene-octene-glycidyl methacrylate has high-efficiency toughening effect on PBT, ethylene-octene has better toughening effect on PC compared with ethylene-n-butyl acrylate (EBA) or ethylene-methyl acrylate (EMA), glycidyl methacrylate has compatibility on a phase interface between PC and PBT, interface cavitation is reduced, and toughness and low-temperature toughness of PC/PBT alloy are greatly improved in cooperation with the first toughening agent. The alloy material is especially suitable for occasions with high requirements on use environment, especially the fields of household appliances, industrial machines and the like which are contacted with oil stains and solvents and have requirements on low-temperature toughness.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concepts pertain. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The invention will be described in detail with reference to examples.
PC S-2000F (Mitsubishi Japanese) with viscosity average molecular weight of 22000 is selected as PC resin; the PBT resin is middle-viscosity PBT GX121 (ceremony petrochemical); RDT-7 (Wei Dong chemical industry) is selected as the flame retardant; other flame retardants are F-2100 (ICL) and FP-600 (Ai Dike); the first toughening agent is S-170H (volume average particle diameter is 350nm, rubber content is 32%) of Taulong chemical industry; other first toughening agents are S-2001 of Mitsubishi Li yang; SOG-03 with good compatibility is selected as the second toughening agent; the other second toughening agents are DuPont PTW; the antioxidant is Chinox1076, namely beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester (CAS No.: [ 2082-79-3 ]); the lubricant in other adjuvants is UNISER-M9676 (Japanese day oil), and the anti-dripping agent is A3800 (Mitsubishi Li yang).
Respectively weighing the polycarbonate resin, the PBT resin, the flame retardant, the synergistic flame retardant, the toughening agent, the antioxidant and other auxiliary agents according to the dosage of each raw material in the formula shown in the table 1, and sequentially adding the raw materials into a mixer to be uniformly mixed to obtain a premix; and then the premix is put into a double-screw extruder for melt mixing and extrusion granulation, and the low-temperature-resistant PC/PBT alloy material is prepared. Wherein the length-diameter ratio of the screw of the double-screw extruder is 40:1, the temperature of the screw cylinder is 230-250 ℃, and the rotating speed of the screw is 400-500rpm.
The prepared low temperature resistant PC/PBT alloy material is respectively tested for notched Izod impact strength, heat resistance and 60 DEG gloss, and the test reference standard or method is as follows.
(1) Solvent resistance: the change in appearance was observed after applying peanut oil to a test piece for tensile strength test (test piece thickness 3.2 mm) using a 1.0% strain clamp according to ASTM D543, and the specimens were classified into a (no crack), B (crack), C (severe crack) to D (fracture) grades according to the weight of crack occurrence.
(2) Method for measuring impact strength of cantilever beam (normal temperature): notched Izod impact strength was measured using a 4.0mm thick molded notched Izod impact bar. Notched Izod impact strength measured in kJ/m according to ISO 180 2 The results were recorded and the test was performed at room temperature (23 ℃).
(3) Method for measuring impact strength of cantilever beam (low temperature): notched Izod impact strength was measured using a 4.0mm thick molded notched Izod impact bar. Notched Izod impact strength measured in kJ/m according to ISO 180 2 The results were recorded and the test was performed at room temperature (-40 ℃).
(4) Method for measuring UL94 flame retardancy:
flammability testing was performed following the protocol "flammability test of plastics materials, UL 94". Flame retardant rating is derived based on the burn rate, the extinguishing time, the ability to resist dripping, and whether or not dripping (drop) is burning. Sample for testing: bars with dimensions 125mm length by 13mm width by no more than 13mm thickness were selected for the thickness of the bars at the time of testing according to the invention to be 2.0mm. According to the UL94 protocol, and based on test results obtained for five samples, the material flame retardant rating can be classified as (UL 94-HB): v0, V1, V2, 5VA and/or 5VB; in the present invention, however, only the flame retardant rating of the material is classified as: v0, V1 and V2, and the classification criteria for each flame retardant rating are:
v0: in the sample placed so that the long axis thereof is 180 degrees with respect to the flame, the period of burning and/or smoldering after the ignition flame is removed does not exceed 10 seconds, and the vertically placed sample does not produce dripping of burning particles that ignite absorbent cotton. The flame out time of the fifth rod is the flame out time of the five rods, each of which ignites twice, wherein the sum of the flame out time of the first ignition (t 1) and the flame out time of the second ignition (t 2), i.e. the maximum flame out time (t1+t2), is less than or equal to 50 seconds.
V1: in the specimen placed so that the long axis thereof is 180 degrees with respect to the flame, the period of burning and/or smoking after the ignition flame is removed does not exceed 30 seconds, and the vertically placed specimen does not produce dripping of burning particles that ignite absorbent cotton. The flame out time of the fifth rod is the flame out time of the five rods, each of which ignites twice, wherein the sum of the flame out time of the first ignition (t 1) and the flame out time of the second ignition (t 2), i.e. the maximum flame out time (t1+t2), is less than or equal to 250 seconds.
V2: in the samples placed such that their long axis is 180 degrees relative to the flame, the average period of burning and/or smoldering after the ignition flame is removed does not exceed 30 seconds, but the vertically placed samples produce drips of burning particles that ignite cotton. The flame out time of the fifth rod is the flame out time of the five rods, each of which ignites twice, wherein the sum of the flame out time of the first ignition (t 1) and the flame out time of the second ignition (t 2), i.e. the maximum flame out time (t1+t2), is less than or equal to 250 seconds.
The results of the above test are shown in Table 1.
TABLE 2 amounts (unit: parts by weight) and performance test results for examples 1-2 and comparative examples 1-6
It can be seen that the comparative example 1 uses the PBT conventional toughening agent PTW, which has good normal temperature toughness but lower low temperature toughness, compared with the composite materials prepared in the comparative examples 1-7; comparative example 2 addition of conventional silicon toughening agent has lower toughening efficiency and notch impact strength at-30 ℃ of less than 20kJ/m 2 The method comprises the steps of carrying out a first treatment on the surface of the When the content of the toughening agent is more and the low-temperature toughness is improved, the flame retardant property is seriously reduced, see comparative example 3; the conventional antimony white synergistic flame retardant is used in comparative example 4, the antimony white is free of oxide, the influence on the toughness of the material, especially the low-temperature toughness is large, in addition, the flame retardant synergistic effect is relatively poor, and the flame retardance is only V-1 grade; comparative example 5, using other bromine flame retardants, the flame retardant efficiency was lower, and only V-2 flame retardant grade was achieved in the PC/PBT alloy with higher PBT content; similarly, the halogen-free flame retardant FP-600 has lower flame retardant efficiency (comparative example 6), can realize V-0 flame retardance in PC/PBT with lower PBT content, but has poorer low-temperature toughness, solvent resistance and other performances.
The low-temperature-resistant PC/PBT alloy material product prepared by the invention can be widely applied to the fields of household appliances, charging pile shells, electric vehicle parts, residential materials, automobile materials, parts manufacturing materials in other industrial fields, and the like, and is particularly suitable for the fields of household appliances, industrial machines, and the like which are contacted with greasy dirt and solvents and have requirements on low-temperature toughness.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A low temperature resistant PC alloy material is characterized in that: comprises the following components in parts by weight:
70.0-90.0 parts of PC resin;
25.0-35.0 parts of PBT resin;
5.0-15.0 parts of flame retardant;
2.0-10.0 parts of auxiliary flame retardant;
2.0-15.0 parts of a first toughening agent;
1.0 to 5.0 parts of a second toughening agent;
0.01-2.0 parts of antioxidant;
0.01-1.2 parts of other auxiliary agents;
the flame retardant is brominated polycarbonate, and the brand of the auxiliary flame retardant is DC8008; the brand of the first toughening agent is S-6720, and the second toughening agent is SOG-03 which is easy to produce.
2. The low temperature resistant PC alloy material according to claim 1, wherein: the low-temperature-resistant PC alloy material comprises the following components in parts by weight:
70.0-90.0 parts of PC resin;
27.0-35.0 parts of PBT resin;
8.0-15.0 parts of flame retardant;
2.0-8.0 parts of auxiliary flame retardant;
2.0-12.0 parts of a first toughening agent;
1.0 to 4.0 parts of a second toughening agent;
0.01-2.0 parts of antioxidant;
0.01-1.2 parts of other auxiliary agents.
3. The low temperature resistant PC alloy material according to claim 1 or 2, characterized in that: at least one of aromatic polycarbonates having a viscosity average molecular weight of 10000 to 40000.
4. The low temperature resistant PC alloy material according to claim 1 or 2, characterized in that: the polycarbonate resin has a viscosity average molecular weight of 12000-25000.
5. The low temperature resistant PC alloy material according to claim 1 or 2, characterized in that: the antioxidant is prepared from the following components in percentage by mass: (0.5-1.0) or only the primary antioxidant, wherein the primary antioxidant and the secondary antioxidant are selected from one of an acrylic antioxidant, a phosphite antioxidant or an alkylated monophenol or polyphenol, and an alkylated reaction product of polyphenol and diene.
6. The low temperature resistant PC alloy material according to claim 5, wherein: the propylene ester antioxidant is octadecyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate; the phosphite antioxidant is tris (nonylphenyl) phosphite, bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite and distearyl pentaerythritol diphosphite; the alkylated monophenol or polyphenol, the reaction product of alkylation of polyphenol and diene is tetrakis [ methylene (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate) ] methane, the butylated reaction product of p-cresol or dicyclopentadiene, alkylated hydroquinone, hydroxylated thiodiphenyl ether, alkylidenebisphenol, benzyl compound, ester of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) -propionic acid with mono-or polyhydric alcohol, ester of beta- (5-tert-butyl-4-hydroxy-3-methylphenyl) -propionic acid with mono-or polyhydric alcohol, ester of thioalkyl or thioaryl compound or amide of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) -propionic acid.
7. The low temperature resistant PC alloy material as claimed in claim 6, wherein: the ester of the thioalkyl or thioaryl compound is distearyl thiopropionate, dilauryl thiopropionate, tricosyl thiopropionate, pentaerythritol-tetrakis [3- (3, 5-di-tert-butyl 4-hydroxyphenyl) propionate.
8. The low temperature resistant PC alloy material according to claim 1 or 2, characterized in that: the primary antioxidant is Chinox1076 and the secondary antioxidant is THANOX 168.
9. The low temperature resistant PC alloy material according to claim 1 or 2, characterized in that: the other auxiliary agent is a lubricant and/or an anti-dripping agent. The lubricant is glyceryl stearate, and the anti-dripping agent is AS coated PTFE.
10. The method for preparing the low temperature resistant PC alloy material according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
(1) Weighing raw materials according to a formula, and sequentially adding the raw materials into a mixer to be blended until the raw materials are uniform to obtain a premix;
(2) Putting the premix prepared in the step (1) into a double-screw extruder, and carrying out melt mixing, extrusion and granulation in the double-screw extruder to obtain the product;
the length-diameter ratio of the screw of the double screw extruder in the step (2) is (40-45): 1, the temperature of the screw barrel is 250-280 ℃, and the rotating speed of the screw rod is 400-500rpm.
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