CN116285321A - Method for eliminating surface dermatoglyph defect of MCA flame-retardant nylon molded product and molded product - Google Patents
Method for eliminating surface dermatoglyph defect of MCA flame-retardant nylon molded product and molded product Download PDFInfo
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- CN116285321A CN116285321A CN202211715429.XA CN202211715429A CN116285321A CN 116285321 A CN116285321 A CN 116285321A CN 202211715429 A CN202211715429 A CN 202211715429A CN 116285321 A CN116285321 A CN 116285321A
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 76
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 239000004677 Nylon Substances 0.000 title claims abstract description 64
- 229920001778 nylon Polymers 0.000 title claims abstract description 64
- 230000007547 defect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 63
- 239000011347 resin Substances 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 47
- 238000001746 injection moulding Methods 0.000 claims abstract description 28
- 239000012763 reinforcing filler Substances 0.000 claims abstract description 11
- 239000004033 plastic Substances 0.000 claims abstract description 10
- 229920003023 plastic Polymers 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 239000003365 glass fiber Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007649 pad printing Methods 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000010456 wollastonite Substances 0.000 claims description 4
- 229910052882 wollastonite Inorganic materials 0.000 claims description 4
- 230000032798 delamination Effects 0.000 claims description 3
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 229910052570 clay Inorganic materials 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 2
- 239000010459 dolomite Substances 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 239000010445 mica Substances 0.000 claims description 2
- 229910052618 mica group Inorganic materials 0.000 claims description 2
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 23
- 239000007924 injection Substances 0.000 abstract description 23
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000000243 solution Substances 0.000 abstract description 7
- 239000010985 leather Substances 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract description 5
- 230000010076 replication Effects 0.000 abstract description 2
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 description 52
- 230000000052 comparative effect Effects 0.000 description 16
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000012545 processing Methods 0.000 description 7
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000012946 outsourcing Methods 0.000 description 4
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 3
- 235000013539 calcium stearate Nutrition 0.000 description 3
- 239000008116 calcium stearate Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229920006351 engineering plastic Polymers 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- QSRJVOOOWGXUDY-UHFFFAOYSA-N 2-[2-[2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoyloxy]ethoxy]ethoxy]ethyl 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CCC(=O)OCCOCCOCCOC(=O)CCC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 QSRJVOOOWGXUDY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- LXWPJAGZRHTAOO-UHFFFAOYSA-N [Sb].[Br] Chemical compound [Sb].[Br] LXWPJAGZRHTAOO-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 1
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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
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34928—Salts
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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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
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- C08L2203/20—Applications use in electrical or conductive gadgets
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Abstract
The invention discloses a method for eliminating the surface dermatoglyph defect of an MCA flame-retardant nylon molded product, wherein the molded product is prepared by injection molding an MCA flame-retardant nylon material under the condition of not externally connecting a mold temperature machine, and the MCA flame-retardant nylon material comprises the following raw material components in parts by weight: 40-65 parts of nylon resin, 5-13 parts of MCA flame retardant, 10-40 parts of reinforcing filler and 0.5-3 parts of other auxiliary agents; the nylon resin is PA6 resin with relative viscosity of 2.4-3.2. According to the invention, the PA6 resin system with specific viscosity is constructed as the matrix resin of the MCA flame-retardant nylon material, so that the MCA flame-retardant nylon material is endowed with good leather pattern replication capability of an injection mold, and a good apparent product without leather pattern defects on the surface can be obtained without an external mold temperature machine when the leather pattern part is injection molded, thereby saving energy and reducing consumption, saving the purchase cost of the mold temperature machine for plastic product manufacturers and providing hydropower cost for corresponding mold temperatures; the traditional solution of sacrificing the injection molding production efficiency of the molded product and replacing the good appearance quality of the molded product is abandoned.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a method for eliminating the surface dermatoglyph defect of an MCA flame-retardant nylon molded product and the molded product.
Background
The halogen-free flame retardant Melamine Cyanurate (MCA) can generate non-combustible gases such as NH3, H2O, N2, CO2, H2NCN and the like when being heated and decomposed due to high nitrogen content, has the functions of absorbing heat, reducing temperature and diluting the concentration of the combustible gases and oxygen, is commonly used as a flame retardant modifier of thermoplastic resin, and is particularly suitable for flame retardant nylon systems. Meanwhile, compared with the traditional bromine-antimony flame retardant and the traditional organophosphorus flame retardant, the MCA flame retardant has higher cost performance, so that the MCA flame retardant nylon material is widely used for manufacturing electrical equipment shells, such as Miniature Circuit Breaker (MCB) shell parts, socket shell parts and the like, in the industry of piezoelectric devices.
The surface of the existing plastic MCB shell piece is not smooth, but is designed to be a matt surface with dermatoglyph, based on the appearance quality of the product and the injection molding efficiency. The design of the dermatoglyph on the surface of the shell part can avoid the defect that the smooth surface is easy to be stained with ash or the fingerprint affects the attractiveness, and can improve the injection molding property, such as: in the injection molding process, a small amount of air can be contained between the surface of the product and the surface of the die cavity, so that vacuum adsorption is not formed, and the subsequent demolding is easier; the stability during ejection is improved, shadows and the like caused by sliding blocks or inclined ejection are avoided, and the qualification rate of injection molding products is improved. Taking an MCB shell as an example, in view of production efficiency and processing cost of products, when the MCB shell is processed by adopting MCA flame-retardant nylon material injection molding, a breaker manufacturer and an outsourcing processing party do not need to be externally connected with a die temperature machine, or a waterway of a die temperature machine connected with a die Wen Jishi is directly connected with cooling water to carry out injection molding in a low-die-temperature state (below 40 ℃), so that the injection molding cycle is shortened, and the production capacity is improved. However, as early as 2017, when domestic well-known manufacturers of electric appliances such as Zhengtai corporation and De Li xi corporation sequentially feed back and adopt MCA flame retardant nylon materials to perform injection molding on MCB shell parts, massive dermatoglyph defects with inconsistent color, texture and reflection degree often appear on the surface of the shell, particularly, the logo mark position of the manufacturer with striking pad printing color is farthest from a glue inlet during injection molding, the surface is more prone to the dermatoglyph defects with inconsistent color and texture, obvious layering problems appear after pad printing, and the visual aesthetic feeling of the MCB shell parts is seriously affected. For this reason, the zhengtai and deluxe companies spend a long time and effort with several MCA flame retardant nylon material manufacturers seeking solutions to overcome this dermatoglyph defect, ultimately ending with raising the mold temperature above 60 ℃ to ensure the apparent mass of the MCB housing pieces. However, for the circuit breaker manufacturer and the outsourcing processing party, the solution is to increase the purchase cost of the mold temperature machine and the electricity consumption of water, and mainly, the injection molding period of the product is correspondingly prolonged by increasing the temperature of the mold, so that the production efficiency of the MCB shell part is reduced. According to statistics of the Zhengtai company, the Del-xi company and the outsourcing processing formulas of the Zhengtai company and the Del-xi company, compared with the production mode that a die temperature is controlled below 40 ℃ without an external die temperature machine or the die temperature, the average production efficiency of producing the MCB shell part by injection molding processing through the mode is reduced by about 15 percent.
Over the course of 5 years, injection molding of MCB housing parts from MCA flame retardant nylon materials has also been to eliminate MCB housing part skin defects at the cost of increasing mold temperature and reducing production efficiency. As a modified engineering plastic manufacturer, on the premise of ensuring that the material cost is acceptable, the material formula design can be used for eliminating the defects of uneven surface color, texture and reflection degree of products existing when the MCB shell part is processed by a non-external mold temperature machine or low-mold temperature injection molding, so that the modified engineering plastic is naturally favored by the manufacturers of the circuit breaker and outsourcing processing parties thereof, and has important research significance and application value.
With respect to the production sellers of the modified engineering plastics, at the present of gradual homogenization of commodities, between similar competing products, the molding processing period of a certain material is shortened by even 1-2 s, so that more cooperation opportunities can be obtained from a downstream client to obtain more orders, and great advantages are occupied in the aspect of market popularization. Therefore, the material formula design is adopted to eliminate the surface skin defects of the injection molding product of the MCA flame-retardant nylon material at a low mold temperature or in a state of not externally connecting a mold temperature machine, and the method has very important practical significance.
Disclosure of Invention
The invention aims to solve the technical problem that the existing MCA flame-retardant nylon material is difficult to overcome and the plastic molded product injection molded at a low mold temperature or without an external mold temperature machine is easy to cause the surface dermatoglyph defect of the product, and provides a method for eliminating the surface dermatoglyph defect of the MCA flame-retardant nylon molded product.
The above object of the present invention is achieved by the following technical solutions:
the method for eliminating the surface dermatoglyph defect of the MCA flame-retardant nylon molded product comprises the following raw material components in parts by weight: 40-65 parts of nylon resin, 5-13 parts of MCA flame retardant, 10-40 parts of reinforcing filler and 0.5-3 parts of other auxiliary agents; the nylon resin is a medium-high viscosity PA6 resin with a relative viscosity of 2.4-3.2.
In the present invention, relative viscosity test referring to GB12006.1-2009, a polyamide viscosity number measurement method was used to measure the relative viscosity of a nylon solution having a concentration of 10 mg/mL in concentrated sulfuric acid of 96% + -0.20% (mass fraction) solution at 25 ℃.
Wherein the reinforcing filler is glass fiber or a compound of glass fiber and powder reinforcing filler.
Optionally, the MCA flame-retardant nylon material comprises the following raw material components in parts by weight: 40-65 parts of PA6 resin, 5-13 parts of MCA flame retardant, 10-30 parts of glass fiber and 0.5-3 parts of other auxiliary agents.
Optionally, the MCA flame-retardant nylon material comprises the following raw material components in parts by weight: 40-65 parts of PA6 resin, 5-13 parts of MCA flame retardant, 15-25 parts of glass fiber, 10-20 parts of powder reinforcing filler and 0.5-3 parts of other auxiliary agents; the PA6 resin is a blend of two or more PA6 resins with relative viscosity of 2.4-3.2.
In the technical scheme, the PA6 resin is a blend of PA6 resin with relative viscosity of 2.4 and PA6 resin with relative viscosity of 2.8, and the weight percentage of the PA6 resin with relative viscosity of 2.4 to the PA6 resin with relative viscosity of 2.8 is 5:1-1:3.
In the technical scheme, the PA6 resin is a blend of PA6 resin with relative viscosity of 2.4 and PA6 resin with relative viscosity of 3.2, and the weight percentage of the PA6 resin with relative viscosity of 2.4 to the PA6 resin with relative viscosity of 3.2 is 6:1-1:1.
Preferably, the powder reinforcing filler is selected from one or more of wollastonite, kaolin, mica, talcum, clay, bentonite, montmorillonite, titanium oxide, calcium carbonate, magnesium carbonate, dolomite, calcium sulfate, barium sulfate, glass beads, glass powder, ceramic beads and milled glass fibers.
Another object of the present invention is to provide a plastic molded product prepared by the above method for eliminating the surface skin defects of the MCA flame retardant nylon molded product.
In a specific application, the plastic molded product protected by the invention is a circuit breaker shell part, and the surface of the circuit breaker shell part has no dermatoglyph defect; after the surface of the circuit breaker shell part is subjected to pad printing identification, the problem of layering of dermatoglyph does not exist.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the PA6 resin system with specific viscosity is constructed as the matrix resin of the MCA flame-retardant nylon material, so that the MCA flame-retardant nylon material is endowed with good leather pattern replication capability of an injection mold, and a good apparent product without leather pattern defects on the surface can be obtained without an external mold temperature machine when the leather pattern part is injection molded, thereby saving energy and reducing consumption, saving the purchase cost of the mold temperature machine for plastic product manufacturers and providing hydropower cost for corresponding mold temperatures; the traditional solution of sacrificing the injection molding production efficiency of the molded product and replacing the good appearance quality of the molded product is abandoned.
Drawings
FIG. 1 is a schematic view of the surface of an MCB housing part injection molded by the method of example 1.
FIG. 2 is a schematic view of the surface of an MCB housing part injection molded by the method of comparative example 1.
Fig. 3 is a schematic representation of the rear surface of the MCB housing member obtained by the methods of comparative example 1 and example 1.
Fig. 4 is a schematic view of the surface of an MCB housing part injection molded by the method of example 2.
Fig. 5 is a schematic view of the surface of an MCB housing part injection molded by the method of example 3.
Fig. 6 is a schematic view of the surface of an MCB housing member injection molded by the method of example 4.
Fig. 7 is a surface view of an MCB housing member injection molded by the method of comparative example 2.
Fig. 8 is a schematic view of the surface of an MCB housing member injection molded by the method of example 5.
Fig. 9 is a schematic view of the surface of an MCB housing member injection molded by the method of example 6.
Fig. 10 is a surface view of an MCB housing member injection molded by the method of comparative example 3.
Detailed Description
The invention is further described below with reference to the drawings and detailed description. The following examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the following examples. Raw materials reagents used in the examples of the present invention are conventionally purchased raw materials reagents unless otherwise specified.
The method for evaluating the dermatoglyph defect of the product comprises the following steps:
MCB shell parts with matte surface dermatoglyph are respectively injection molded by using the methods of the examples and the comparative examples, and the surface condition of the shell is observed by adopting a visual method to evaluate dermatoglyph defects.
Example 1
For the first time, preparing an MCA flame-retardant nylon material, namely: 64 parts of PA6 resin (relative viscosity is 2.4), 6 parts of MCA flame retardant, 0.5 part of calcium stearate and 0.6 part of antioxidant 1098 are premixed according to parts by weight, then added from a main feeding port of a double-screw extruder, 30 parts of glass fiber is added from a side feeding port of the double-screw extruder, and the MCA flame retardant nylon material is obtained through melt blending, extrusion, bracing, cooling and granulating. Wherein, the length-diameter ratio of the screw of the double screw extruder is 40-48:1, the melting plasticizing temperature is 220-265 ℃, and the screw rotating speed is 220-400 r/min.
Then, the prepared MCA flame-retardant nylon material is put into an injection molding machine, and the MCB shell piece is injection molded under the state that a mold temperature machine is not externally connected, and the surface condition of the MCB shell piece is shown in figure 1.
Comparative example 1
The relative viscosity of the PA6 resin in comparative example 1 was 2.0 compared to example 1, and the rest was exactly the same as in example 1. The surface condition of the MCB housing member obtained in the comparative document 1 is shown in fig. 2.
Pad printing marks were carried out on the MCB housing parts prepared by the methods of example 1 and comparative example 1, and the surface conditions of pad printing portions of the MCB housing parts of comparative example 1 and example 1 are shown in FIG. 3.
Example 2
Firstly, preparing an MCA flame-retardant nylon material, namely: 40 parts of PA6 resin (relative viscosity is 2.4), 20 parts of PA6 resin (relative viscosity is 2.8), 10 parts of MCA flame retardant, 20 parts of glass fiber, 0.5 part of calcium stearate and 0.6 part of antioxidant 245 are premixed, then a twin-screw extruder is added from a main feeding port, 10 parts of wollastonite is added from a side feeding port, and the mixture is melted, blended, extruded, bracing, cooled and pelletized to obtain the MCA flame retardant nylon material. Wherein, the length-diameter ratio of the screw of the double screw extruder is 40-48:1, the melting plasticizing temperature is 220-265 ℃, and the screw rotating speed is 220-400 r/min.
Then, the prepared MCA flame-retardant nylon material is put into an injection molding machine, and the MCB shell piece is injection molded under the state that a mold temperature machine is not externally connected, and the surface condition of the MCB shell piece is shown in fig. 4.
Example 3
Firstly, preparing an MCA flame-retardant nylon material, namely: 54 parts of PA6 resin (relative viscosity is 2.8), 11 parts of MCA flame retardant, 5 parts of glass fiber, 0.5 part of calcium stearate and 0.6 part of antioxidant 245 are premixed according to parts by weight, then the mixture is added into a double-screw extruder from a main feeding port, 30 parts of wollastonite is added into the double-screw extruder from a side feeding port, and the mixture is melted, blended, extruded, bracing, cooled and pelletized to obtain the MCA flame retardant nylon material. Wherein, the length-diameter ratio of the screw of the double screw extruder is 40-48:1, the melting plasticizing temperature is 220-265 ℃, and the screw rotating speed is 220-400 r/min.
Then, the prepared MCA flame-retardant nylon material is put into an injection molding machine, and the MCB shell piece is injection molded under the state that a mold temperature machine is not externally connected, and the surface condition of the MCB shell piece is shown in figure 5.
Example 4
Firstly, preparing an MCA flame-retardant nylon material, namely: 50 parts of PA6 resin (relative viscosity is 2.4), 10 parts of PA6 resin (relative viscosity is 3.2), 10 parts of MCA flame retardant, 10 parts of glass fiber, 0.5 part of lubricant A-C540A and 0.6 part of antioxidant 1098 are premixed, then a twin-screw extruder is added from a main feeding port, 20 parts of glass powder is added from a side feeding port, and the twin-screw extruder is subjected to melting, blending, extrusion, bracing, cooling and granulating to obtain the MCA flame retardant nylon material. Wherein, the length-diameter ratio of the screw of the double screw extruder is 40-48:1, the melting plasticizing temperature is 220-265 ℃, and the screw rotating speed is 220-400 r/min.
Then, the prepared MCA flame-retardant nylon material is put into an injection molding machine, and the MCB shell piece is injection molded under the state that the mold temperature machine is not externally connected, and the surface condition of the MCB shell piece is shown in figure 6.
Comparative example 2
The PA6 resin in comparative example 2 was a single PA6 resin having a relative viscosity of 2.3, compared with example 4, and the surface condition of the MCB housing member obtained in comparative example 2 was shown in fig. 7, except that the mold temperature of 40 ℃ was used in injection molding the MCB housing member, which was the same as in example 4.
Example 5
Firstly, preparing an MCA flame-retardant nylon material, namely: 21 parts of PA6 resin (relative viscosity is 2.4), 42 parts of PA6 resin (relative viscosity is 2.8), 7 parts of MCA flame retardant, 15 parts of glass fiber, 0.5 part of lubricant A-C540A and 0.6 part of antioxidant 1098 are premixed, then a twin-screw extruder is added from a main feeding port, 20 parts of glass powder is added from a side feeding port, and the twin-screw extruder is subjected to melting, blending, extrusion, bracing, cooling and granulating to obtain the MCA flame retardant nylon material. Wherein, the length-diameter ratio of the screw of the double screw extruder is 40-48:1, the melting plasticizing temperature is 220-265 ℃, and the screw rotating speed is 220-400 r/min.
Then, the prepared MCA flame-retardant nylon material is put into an injection molding machine, and the MCB shell piece is injection molded under the state that a mold temperature machine is not externally connected, and the surface condition of the MCB shell piece is shown in figure 8.
Example 6
Firstly, preparing an MCA flame-retardant nylon material, namely: 30 parts of PA6 resin (relative viscosity 2.4), 30 parts of PA6 resin (relative viscosity 2.8), 10 parts of MCA flame retardant, 20 parts of glass fiber, 0.5 part of lubricant A-C540A, 0.6 part of antioxidant 1098 and 1 part of black masterbatch are premixed, then a twin-screw extruder is added from a main feeding port, 10 parts of glass powder is added from a side feeding port into the twin-screw extruder, and the MCA flame retardant nylon material is obtained through melting, blending, extrusion, bracing, cooling and granulating. Wherein, the length-diameter ratio of the screw of the double screw extruder is 40-48:1, the melting plasticizing temperature is 220-265 ℃, and the screw rotating speed is 220-400 r/min.
Then, the prepared MCA flame-retardant nylon material is put into an injection molding machine, and the MCB shell member is injection molded under the state that the mold temperature machine is not externally connected, and the surface condition of the MCB shell member is shown in figure 9.
Comparative example 3
The PA6 resin in comparative example 3 was a single PA6 resin having a relative viscosity of 2.0, compared with example 6, and a mold temperature of 40 ℃ was used in injection molding of the MCB housing member, and the rest was exactly the same as in example 6. The surface condition of the MCB housing member obtained in comparative example 3 is shown in fig. 10.
As is apparent from fig. 1, fig. 4, fig. 5, fig. 6, fig. 8 and fig. 9, when the PA6 resin with higher viscosity (the relative viscosity value is 2.4-3.2) is selected as the matrix resin in the preparation of the MCA flame-retardant nylon material, the surface color, texture and reflection degree of the injection molded MCB shell piece are consistent without an external mold temperature machine, and the problem of skin-pattern defect is avoided; when PA6 resin with a relative viscosity value lower than 2.4 is selected as matrix resin (as shown in figures 2, 7 and 10) to prepare the MCA flame-retardant nylon material and the MCB shell piece is subjected to injection molding by using the material, the surface of the injection molded MCB shell piece has uneven skin defects with obvious watermark-like color and luster under the condition of not externally connecting a mold temperature machine or setting the mold temperature to 40 ℃. It can be seen that the preparation of the MCA flame-retardant PA6 material by constructing the PA6 resin system with specific viscosity can indeed eliminate the surface dermatoglyph defect of the MCA flame-retardant PA6 material molded product.
As is apparent from fig. 3, after the MCB shell member obtained by the technical scheme is subjected to pad printing, no delamination appears on the surface of the pad printed part (fig. 3 b), while the MCA shell member is prepared by injection molding of the MCA flame retardant nylon material by using PA6 resin with a relative viscosity value lower than 2.4 as a matrix resin, and the pad printed part has obvious watermark-like dermatoglyph defects before pad printing, and obvious delamination phenomenon appears after pad printing (fig. 3 a).
Variations and modifications to the above would be obvious to persons skilled in the art to which the invention pertains from the foregoing description and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (10)
1. The method for eliminating the surface dermatoglyph defect of the MCA flame-retardant nylon molded product is characterized in that the molded product is prepared by injection molding an MCA flame-retardant nylon material under the condition of not externally connecting a mold temperature machine, and the MCA flame-retardant nylon material comprises the following raw material components in parts by weight: 40-65 parts of nylon resin, 5-13 parts of MCA flame retardant, 10-40 parts of reinforcing filler and 0.5-3 parts of other auxiliary agents; the nylon resin is PA6 resin with relative viscosity of 2.4-3.2.
2. The method for eliminating surface skin defects of an MCA flame retardant nylon molded article according to claim 1, wherein the reinforcing filler is glass fiber or a compound of glass fiber and a powder reinforcing filler.
3. The method for eliminating the surface dermatoglyph defect of the MCA flame-retardant nylon molded product according to claim 2, wherein the MCA flame-retardant nylon material comprises the following raw material components in parts by weight: 40-65 parts of PA6 resin, 5-13 parts of MCA flame retardant, 10-30 parts of glass fiber and 0.5-3 parts of other auxiliary agents.
4. The method for eliminating the surface dermatoglyph defect of the MCA flame-retardant nylon molded product according to claim 2, wherein the MCA flame-retardant nylon material comprises the following raw material components in parts by weight: 40-65 parts of PA6 resin, 5-13 parts of MCA flame retardant, 15-25 parts of glass fiber, 10-20 parts of powder reinforcing filler and 0.5-3 parts of other auxiliary agents; the PA6 resin is a blend of two or more PA6 resins with relative viscosity of 2.4-3.2.
5. The method for eliminating surface skin defects of an MCA flame retardant nylon molded article according to claim 4, wherein the PA6 resin is a blend of PA6 resin with a relative viscosity of 2.4 and PA6 resin with a relative viscosity of 2.8, and the weight percentage of the PA6 resin with a relative viscosity of 2.4 and the PA6 resin with a relative viscosity of 2.8 is 5:1 to 1:3.
6. The method for eliminating surface skin defects of an MCA flame-retardant nylon molded article according to claim 4, wherein the nylon resin is a blend of PA6 resin with a relative viscosity of 2.4 and PA6 resin with a relative viscosity of 3.2, and the weight percentage of the PA6 resin with a relative viscosity of 2.4 and the PA6 resin with a relative viscosity of 3.2 is 6:1-1:1.
7. The method for eliminating surface skin defects of an MCA flame-retardant nylon molded article according to any one of claims 4 to 6, wherein the powder reinforcing filler is one or more selected from wollastonite, kaolin, mica, talc, clay, bentonite, montmorillonite, titanium oxide, calcium carbonate, magnesium carbonate, dolomite, calcium sulfate, barium sulfate, glass beads, glass powder, ceramic beads, and milled glass fibers.
8. A plastic molded article characterized in that the molded article is produced by the method for eliminating the surface skin defects of the MCA flame retardant nylon molded article according to any one of claims 1 to 7.
9. The plastic molded article according to claim 8, wherein the plastic molded article is a circuit breaker housing member, and wherein the circuit breaker housing member has no skin defects on a surface thereof.
10. The plastic molded product according to claim 9, wherein after pad printing the surface of the circuit breaker housing member, the circuit breaker housing member is free of the problem of skin delamination.
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| CN202211715429.XA CN116285321A (en) | 2022-12-30 | 2022-12-30 | Method for eliminating surface dermatoglyph defect of MCA flame-retardant nylon molded product and molded product |
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| CN202211715429.XA CN116285321A (en) | 2022-12-30 | 2022-12-30 | Method for eliminating surface dermatoglyph defect of MCA flame-retardant nylon molded product and molded product |
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