CN114031891A - Phenolic molding plastic with good tracking resistance and preparation method thereof - Google Patents
Phenolic molding plastic with good tracking resistance and preparation method thereof Download PDFInfo
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- CN114031891A CN114031891A CN202111434569.5A CN202111434569A CN114031891A CN 114031891 A CN114031891 A CN 114031891A CN 202111434569 A CN202111434569 A CN 202111434569A CN 114031891 A CN114031891 A CN 114031891A
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- 238000000465 moulding Methods 0.000 title claims abstract description 33
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000004033 plastic Substances 0.000 title claims description 10
- 229920003023 plastic Polymers 0.000 title claims description 10
- 238000002360 preparation method Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 32
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 23
- 150000001875 compounds Chemical class 0.000 claims abstract description 21
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000013078 crystal Substances 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims abstract description 15
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000006184 cosolvent Substances 0.000 claims abstract description 13
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 13
- 239000005011 phenolic resin Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000012745 toughening agent Substances 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 9
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000010445 mica Substances 0.000 claims abstract description 8
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 15
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical group [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 14
- 239000000347 magnesium hydroxide Substances 0.000 claims description 14
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 14
- 239000003677 Sheet moulding compound Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 7
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 7
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical group C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 5
- 229920000459 Nitrile rubber Polymers 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 4
- 239000002023 wood Substances 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 3
- 239000004312 hexamethylene tetramine Substances 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 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 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 101100008047 Caenorhabditis elegans cut-3 gene Proteins 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a phenolic molding compound with good tracking resistance, which is prepared from the following components in parts by weight: 350-380 parts of phenolic resin, 75-85 parts of curing agent, 40-50 parts of nano reinforcing powder, 20-25 parts of talcum powder, 190-200 parts of organic reinforcing fiber, 15-25 parts of inorganic reinforcing fiber, 60-70 parts of calcium sulfate whisker, 20-30 parts of toughening agent, 50-90 parts of crystal water-containing filler, 30-40 parts of cosolvent and 50-60 parts of mica powder, wherein the phenolic resin is prepared from proper raw materials, wherein, the calcium sulfate crystal whisker can improve the tracking resistance of the material, and the fiber structure is utilized to achieve the effects of strengthening and toughening, the addition of the filler containing the crystal water can resolve water molecules from the filler containing the crystal water at the high temperature generated during discharging in the process of electric marking and flush carbon particles on the surface of the material, thereby improving the electric marking resistance of the material, in addition, the addition of the cosolvent is beneficial to plugging the conductive channel, so that the tracking resistance of the material is improved.
Description
Technical Field
The invention relates to the technical field of phenolic moulding plastic, in particular to phenolic moulding plastic with good tracking resistance and a preparation method thereof.
Background
The phenolic moulding plastic is powder plastic powder which is prepared by taking wood powder as a main filler and other additives, and is suitable for the hot-pressing method for moulding bottle caps, buttons and other daily necessities and common mechanical parts.
The process of gradually forming a conductive path on the surface of the solid insulating material under the combined action of an electric field and an electrolyte is called tracking. The tracking resistance of the surface of the insulating material is called tracking resistance, and is also called tracking resistance. The development of tracking in polymer insulation is determined by the formation and accumulation of free carbon on the surface of the material. The phenolic molding compound is easy to form a conductive substance similar to a graphite structure after being electrically-scratched due to the aromatic molecular structure of the phenolic resin, so that a conductive path is easily formed on the surface of the material, and the tracking resistance of the phenolic molding compound is poor. When the phenolic molding compound is used on the shell of an electric appliance accessory, particularly when the electrical tracking performance of part of product application requirements is higher, the existing phenolic molding compound cannot meet the requirements.
Disclosure of Invention
The invention provides a phenolic moulding plastic with good tracking resistance and a preparation method thereof, which solve the problems in the prior art in the using process.
The technical scheme of the invention is realized as follows: the phenolic molding compound with good tracking resistance performance is characterized in that: the composition is prepared from the following components in parts by weight: 350-380 parts of phenolic resin, 75-85 parts of curing agent, 40-50 parts of nano reinforcing powder, 20-25 parts of talcum powder, 190-200 parts of organic reinforcing fiber, 15-25 parts of inorganic reinforcing fiber, 60-70 parts of calcium sulfate whisker, 20-30 parts of toughening agent, 50-90 parts of crystal water-containing filler, 30-40 parts of cosolvent and 50-60 parts of mica powder.
Preferably, the crystal water-containing filler is magnesium hydroxide and/or aluminum hydroxide.
Preferably, the curing agent is hexamethylenetetramine.
Preferably, the nano reinforcing powder is nano calcium carbonate.
Preferably, the organic reinforcing fiber is wood flour and/or bamboo flour.
Preferably, the inorganic reinforcing fibers are alkali-free glass fibers.
Preferably, the toughening agent is nitrile rubber or polyvinyl butyral.
Preferably, the cosolvent is one or a combination of zinc borate, ceramic zinc borate and low-melting-point glass powder.
Preferably, the particle size of the magnesium hydroxide is between 700-850 meshes.
The invention also provides a preparation method of the phenolic molding compound with good tracking resistance, which comprises the following steps:
s1, adding phenolic resin, a curing agent, nano reinforcing powder, talcum powder, organic reinforcing fiber, inorganic reinforcing fiber, calcium sulfate whisker, a toughening agent, crystal water-containing filler and a cosolvent into a mixer for mixing, wherein the materials are sequentially added into the mixer according to the sequence of the organic reinforcing fiber, other materials and the phenolic resin, the mixing time is not less than 20 minutes, the moisture of the mixed mixture is controlled to be 6-7%, and in addition, sampling and rolling are carried out in advance in the material mixing process, so that the accidents caused by wrong ingredients are prevented;
s2, plasticating the mixture obtained in the step S1 in a plasticating machine at the plasticating temperature of 120-160 ℃ for 3-5min, rolling by using double rollers on a rolling machine to obtain sheet molding compound, wherein the distance between the double rollers is 1.5-2.5 mm, the temperature of an operating roller is 85-95 ℃, and the rolling time is 2-3 min;
and S3, after the sheet molding compound obtained in the S2 is cooled, crushing, batch mixing and magnetic separation are carried out on the sheet molding compound to obtain the phenolic molding compound with good tracking resistance, wherein the fineness of crushing is 3.5-4.0 mm, and the batch mixing time is not less than 30 minutes.
In conclusion, the beneficial effects of the invention are as follows:
1. the invention adopts proper raw materials, wherein, the calcium sulfate whisker can improve the tracking resistance of the material, and the fiber structure is utilized to achieve the effect of strengthening and toughening, and the addition of the filler containing crystal water can resolve water molecules from the filler containing crystal water at high temperature generated during discharging in the tracking process, so as to wash away carbon particles on the surface of the material, thereby improving the tracking resistance of the material, and the addition of the mica powder can effectively improve the insulating property and the flame retardant property of the material, thereby improving the tracking resistance of the material, and in addition, the addition of the cosolvent is beneficial to plugging a conductive channel, thereby improving the tracking resistance of the material.
Detailed Description
The following description is only a preferred embodiment of the present invention, and the protection scope is not limited to the embodiment, and any technical solution that falls under the idea of the present invention should fall within the protection scope of the present invention. It should also be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention.
The invention discloses a phenolic moulding plastic with good tracking resistance, which is prepared from the following components in parts by weight: 350-380 parts of phenolic resin, 75-85 parts of curing agent, 40-50 parts of nano reinforcing powder, 20-25 parts of talcum powder, 190-200 parts of organic reinforcing fiber, 15-25 parts of inorganic reinforcing fiber, 60-70 parts of calcium sulfate whisker, 20-30 parts of toughening agent, 50-90 parts of crystal water-containing filler, 30-40 parts of cosolvent and 50-60 parts of mica powder.
In a preferred embodiment of the invention, the crystal water-containing filler is magnesium hydroxide and/or aluminum hydroxide, the magnesium hydroxide and the aluminum hydroxide have flame retardant and smoke suppression effects, the magnesium hydroxide and the aluminum hydroxide can be decomposed to separate out water molecules at high temperature generated during discharging in the process of electrotracking, carbon particles deposited on the surface of the material can be washed away by the formed steam airflow, and volatile carbon is formed during electrotracking due to the fact that the magnesium hydroxide and the aluminum hydroxide are rich in oxygen, so that residual carbon is reduced, and the improvement of the anti-tracking performance of the material is facilitated.
In a preferred embodiment of the present invention, the curing agent is hexamethylenetetramine.
In a preferred embodiment of the invention, the nano reinforcing powder is nano calcium carbonate, which improves the rheological property and the formability of the material, and has the functions of toughening and reinforcing the material, improving the bending strength and the bending elastic modulus of the material, the heat distortion temperature and the dimensional stability, and simultaneously endowing the plastic with heat hysteresis.
In a preferred embodiment of the invention, the organic reinforcing fiber is wood powder and/or bamboo powder, and a certain amount of organic reinforcing fiber is added to increase the molding shrinkage of the material, so that the material can be rapidly and smoothly demoulded after being molded, and the production efficiency is improved.
In a preferred embodiment of the present invention, the inorganic reinforcing fibers are alkali-free glass fibers, which can enhance the electrical insulation performance and mechanical strength of the material, but it should be noted that the alkali-free glass fibers can increase the roughness of the surface of the material, thereby forming electrical stress concentration points, and easily generating electric discharge, so that reducing the exposure of the glass fibers during the reproduction molding process can help to improve the tracking resistance of the material.
In a preferred embodiment of the invention, the toughening agent is nitrile rubber or polyvinyl butyral, and the nitrile rubber and the polyvinyl butyral can enhance the plasticizing effect of the material, enhance the flexibility and facilitate the processing.
Mica powder is added in the material, and the mica powder has good elasticity and toughness. The mica powder mainly contains silicon dioxide, and the silicon dioxide powder can greatly reduce electric corrosion, thereby improving the tracking resistance.
In a preferred embodiment of the invention, the cosolvent is one or a combination of several of zinc borate, zinc ceram borate and low-melting glass powder, the phenolic molding compound is easy to form a conductive substance similar to a graphite structure after electroshocking due to the aromatic molecular structure of the phenolic resin as the high-voltage discharge continuously shocks the surface of the insulating material, and the added magnesium hydroxide and aluminum hydroxide are also decomposed into aluminum oxide and magnesium oxide, the residual powder can be piled up to form a 'conductive path' and is finally broken down, and the addition of one or a combination of more of cosolvent zinc borate, ceramic zinc borate and low-melting-point glass powder can help residual alumina, magnesium oxide, talcum powder, calcium carbonate and the like, a continuous glass or ceramic substance is formed on the surface of the insulator, thereby blocking the 'conductive path'.
In a preferred embodiment of the present invention, the particle size of the magnesium hydroxide is between 700-850 mesh, the particle size of the magnesium hydroxide is too large to meet the requirement of improving the tracking resistance, and if the particle size of the magnesium hydroxide is too small, the viscosity coefficient of the system is increased, and the magnesium hydroxide is not easy to be uniformly dispersed, so the particle size of the magnesium hydroxide is most preferably between 700-850 mesh.
The invention also provides a preparation method of the phenolic molding compound with good tracking resistance, which comprises the following steps:
s1, adding phenolic resin, a curing agent, nano reinforcing powder, talcum powder, organic reinforcing fiber, inorganic reinforcing fiber, calcium sulfate whisker, a toughening agent, crystal water-containing filler and a cosolvent into a mixer for mixing, wherein the materials are sequentially added into the mixer according to the sequence of the organic reinforcing fiber, other materials and the phenolic resin, the mixing time is not less than 20 minutes, the moisture of the mixed mixture is controlled to be 6-7%, and in addition, sampling and rolling are carried out in advance in the material mixing process, so that the accidents caused by wrong ingredients are prevented;
s2, plasticating the mixture obtained in the step S1 in a plasticating machine at the plasticating temperature of 120-160 ℃ for 3-5min, rolling by using double rollers on a rolling machine to obtain sheet molding compound, wherein the distance between the double rollers is 1.5-2.5 mm, the temperature of an operating roller is 85-95 ℃, and the rolling time is 2-3 min;
and S3, after the sheet molding compound obtained in the S2 is cooled, crushing, batch mixing and magnetic separation are carried out on the sheet molding compound to obtain the phenolic molding compound with good tracking resistance, wherein the fineness of crushing is 3.5-4.0 mm, and the batch mixing time is not less than 30 minutes.
The rolling process in the S2 comprises the following specific steps: (1) adjusting the distance and the temperature of the roller before rolling to meet the process requirements, and checking whether the equipment runs normally; (2) starting a mixture conveying switch, conveying a certain amount of materials into a cloth bag on the upper side of the roller for later use, lightly adding the materials in the cloth bag between the two rollers, avoiding flying as much as possible, and timely cleaning the materials leaked in the iron plate below the rollers in operation; (3) about 1 minute from the feeding, cut 3 ~4 kilograms of material down as the material of drawing of next operation, before next operation, should draw the material earlier and put into between the cylinder to reduce the material and fall by two roll gaps, the operation of being convenient for. (4) The material between the two rolls should be completely discharged within 1 minute and 30 seconds from the completion of the feeding. (5) After the materials are discharged, the materials are continuously cut and turned to be rolled uniformly, and raw powder, hard powder, oil stain and other impurities cannot be brought into the materials in the rolling process; (6) after the rolling time meets the requirement, starting a bottom conveyor belt, cutting the sheet molding compound, conveying the sheet molding compound onto the conveyor belt, cooling, rolling the sheet molding compound, and crushing until the water volatile matter is not more than 4.5%; (7) when different varieties are replaced, the roller is thoroughly cleaned to prevent influencing the product quality.
The present invention will now be described in detail by way of examples
Table 1 shows the composition (in parts by weight) and performance index of the phenolic molding materials of examples 1 to 6, which are excellent in tracking resistance. The test pieces for evaluation of properties were prepared by press molding under the following conditions: the preheating temperature is 95-115 ℃, the pressing mold temperature is 165-175 ℃, and the curing time is 1.0 min/mm.
Table 1:
the above experiments were carried out at 23 ℃. + -. 2 ℃.
As is clear from table 1, in any of examples 1 to 6, the materials are prepared according to the formulation specified in the present invention, and the main reason why the resin content is reduced and the mineral content is increased, the heat resistance of the material is improved, and the tracking resistance index of the material is improved in example 1 and example 2 compared with other examples.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The phenolic molding compound with good tracking resistance performance is characterized in that: the composition is prepared from the following components in parts by weight: 350-380 parts of phenolic resin, 75-85 parts of curing agent, 40-50 parts of nano reinforcing powder, 20-25 parts of talcum powder, 190-200 parts of organic reinforcing fiber, 15-25 parts of inorganic reinforcing fiber, 60-70 parts of calcium sulfate whisker, 20-30 parts of toughening agent, 50-90 parts of crystal water-containing filler, 30-40 parts of cosolvent and 50-60 parts of mica powder.
2. The phenolic molding compound with good tracking resistance as claimed in claim 1, wherein: the filler containing crystal water is magnesium hydroxide and/or aluminum hydroxide.
3. The phenolic molding compound with good tracking resistance as claimed in claim 1, wherein: the curing agent is hexamethylenetetramine.
4. The phenolic molding compound with good tracking resistance as claimed in claim 1, wherein: the nano reinforcing powder is nano calcium carbonate.
5. The phenolic molding compound with good tracking resistance as claimed in claim 1, wherein: the organic reinforced fiber is wood powder and/or bamboo powder.
6. The phenolic molding compound with good tracking resistance as claimed in claim 1, wherein: the inorganic reinforcing fiber is alkali-free glass fiber.
7. The phenolic molding compound with good tracking resistance as claimed in claim 1, wherein: the toughening agent is nitrile rubber or polyvinyl butyral.
8. The phenolic molding compound with good tracking resistance as claimed in claim 1, wherein: the cosolvent is one or a combination of zinc borate, ceramic zinc borate and low-melting-point glass powder.
9. The phenolic molding compound with good tracking resistance as claimed in claim 2, wherein: the particle size of the magnesium hydroxide is between 700 and 850 meshes.
10. A preparation method of the phenolic moulding plastic with good tracking resistance suitable for any one of claims 1 to 9 is characterized by comprising the following steps:
s1, adding phenolic resin, a curing agent, nano reinforcing powder, talcum powder, organic reinforcing fiber, inorganic reinforcing fiber, calcium sulfate whisker, a toughening agent, crystal water-containing filler and a cosolvent into a mixer for mixing, wherein the materials are sequentially added into the mixer according to the sequence of the organic reinforcing fiber, other materials and the phenolic resin, the mixing time is not less than 20 minutes, the moisture of the mixed mixture is controlled to be 6-7%, and in addition, sampling and rolling are carried out in advance in the material mixing process, so that the accidents caused by wrong ingredients are prevented;
s2, plasticating the mixture obtained in the step S1 in a plasticating machine at the plasticating temperature of 120-160 ℃ for 3-5min, rolling by using double rollers on a rolling machine to obtain sheet molding compound, wherein the distance between the double rollers is 1.5-2.5 mm, the temperature of operating rollers is 85-95 ℃, and the rolling time is 2-3 min;
and S3, after the sheet molding compound obtained in the S2 is cooled, crushing, batch mixing and magnetic separation are carried out on the sheet molding compound to obtain the phenolic molding compound with good tracking resistance, wherein the fineness of crushing is 3.5 mm-4.0 mm, and the batch mixing time is not less than 30 minutes.
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Citations (4)
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| JP2000063621A (en) * | 1998-08-25 | 2000-02-29 | Sumitomo Bakelite Co Ltd | Phenolic resin molding material |
| JP2000178408A (en) * | 1998-12-17 | 2000-06-27 | Sumitomo Bakelite Co Ltd | Phenolic resin molding material |
| CN102020827A (en) * | 2010-10-14 | 2011-04-20 | 常熟东南塑料有限公司 | Phenolic moulding plastic for low-voltage apparatus |
| CN110577718A (en) * | 2019-10-30 | 2019-12-17 | 上海欧亚合成材料股份有限公司 | aniline modified phenolic molding compound for low-voltage electrical apparatus and preparation method thereof |
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- 2021-11-29 CN CN202111434569.5A patent/CN114031891A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000063621A (en) * | 1998-08-25 | 2000-02-29 | Sumitomo Bakelite Co Ltd | Phenolic resin molding material |
| JP2000178408A (en) * | 1998-12-17 | 2000-06-27 | Sumitomo Bakelite Co Ltd | Phenolic resin molding material |
| CN102020827A (en) * | 2010-10-14 | 2011-04-20 | 常熟东南塑料有限公司 | Phenolic moulding plastic for low-voltage apparatus |
| CN110577718A (en) * | 2019-10-30 | 2019-12-17 | 上海欧亚合成材料股份有限公司 | aniline modified phenolic molding compound for low-voltage electrical apparatus and preparation method thereof |
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