CN111690107A - Liquid phenolic resin and preparation method thereof - Google Patents
Liquid phenolic resin and preparation method thereof Download PDFInfo
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- CN111690107A CN111690107A CN202010685812.XA CN202010685812A CN111690107A CN 111690107 A CN111690107 A CN 111690107A CN 202010685812 A CN202010685812 A CN 202010685812A CN 111690107 A CN111690107 A CN 111690107A
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- phenolic resin
- liquid phenolic
- grinding wheel
- resin
- silane coupling
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000005011 phenolic resin Substances 0.000 title claims abstract description 39
- 229920001568 phenolic resin Polymers 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims description 8
- 238000000227 grinding Methods 0.000 claims abstract description 43
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000005520 cutting process Methods 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 15
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 13
- 239000003054 catalyst Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004202 carbamide Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000005562 fading Methods 0.000 claims abstract description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000006068 polycondensation reaction Methods 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 3
- 229910001610 cryolite Inorganic materials 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 2
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 claims description 2
- 238000012643 polycondensation polymerization Methods 0.000 claims description 2
- 229920005989 resin Polymers 0.000 abstract description 16
- 239000011347 resin Substances 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 10
- 230000002209 hydrophobic effect Effects 0.000 abstract description 7
- 239000011230 binding agent Substances 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 4
- 239000004890 Hydrophobing Agent Substances 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 3
- 230000007935 neutral effect Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 6
- 239000002518 antifoaming agent Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000003377 acid catalyst Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 235000019253 formic acid Nutrition 0.000 description 3
- 239000004312 hexamethylene tetramine Substances 0.000 description 3
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000003483 aging Methods 0.000 description 2
- 229910001651 emery Inorganic materials 0.000 description 2
- 239000008098 formaldehyde solution Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- KAEAMHPPLLJBKF-UHFFFAOYSA-N iron(3+) sulfide Chemical compound [S-2].[S-2].[S-2].[Fe+3].[Fe+3] KAEAMHPPLLJBKF-UHFFFAOYSA-N 0.000 description 1
- -1 light Chemical compound 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
- C08G8/10—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with phenol
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
- B24D3/344—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent the bonding agent being organic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/12—Cut-off wheels
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention discloses a liquid phenolic resin which is prepared by mixing the following components in percentage by mass: 40-50% of phenol, 45-57% of formaldehyde, 0.5-1.0% of an alkaline catalyst, 1.0-3.0% of furfuryl alcohol, 0.5-2.0% of urea and 0.01-0.5% of a silane coupling agent. The liquid phenolic resin, the powder phenolic resin, the grinding material and the filler are mixed, molded and cured to prepare the cutting grinding wheel, the pH value of the liquid phenolic resin is adjusted to be neutral, the silane coupling agent can improve the interface performance between the resin and the inorganic grinding material, the hydrophobing agent powder phenolic resin with excellent hydrophobic performance and the hydrophobing agent powder phenolic resin are selected to be used as the binder of the grinding wheel, and the manufactured grinding wheel can prevent water vapor in the air from invading into the gap between the grinding material and the resin binder in the transportation and storage processes, so that the degradation speed and the interface stripping speed of the resin are reduced, and the anti-fading performance of the grinding wheel is greatly improved.
Description
Technical Field
The invention belongs to the technical field of industry, relates to the technical field of grinding tools, and particularly relates to a liquid phenolic resin for an anti-fading cutting grinding wheel and a preparation method thereof.
Background
The cutting grinding wheel is the most important grinding tool in the bonded grinding tools, and is the largest grinding tool in use amount and the widest use range. When the grinding wheel is used, the grinding wheel rotates at a high speed, and can perform grooving, cutting and the like on metal or nonmetal materials. The properties of the grinding wheel are mainly determined by the types and the granularity of the grinding materials, bonding agents, fillers, tissues, shapes, sizes and other factors. The abrasive is the main raw material for manufacturing the grinding wheel and is responsible for cutting work. Therefore, the abrasive must be sharp and have high hardness, good heat resistance and a certain toughness.
The cutting grinding wheel product made of the traditional phenolic resin generally has the problems of reduced cutting performance and the like of the grinding wheel product due to the action of external factors such as water vapor, light, ozone and the like in the transportation and storage processes. The cutting performance of the grinding wheel is reduced, namely grinding wheel recession, generally, the time span from production to use of a customer of the cutting wheel is from several weeks to several months, a period of some outlet grinding wheels is even from half a year to more than one year, due to the influence of ambient temperature, humidity and light in the transportation and storage processes, the cutting performance of the cutting wheel is reduced by 30-40% in one month after production, and is reduced by about 50% in three months, so that great loss is caused to both a manufacturer and the customer. At present, the mode of vacuum plastic package and preservation in the shade has been generally adopted in the market, and the recession speed of the grinding wheel is reduced, but the problem is not thoroughly solved by the method.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a liquid phenolic resin for an anti-recession abrasive cutting wheel and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions: the liquid phenolic resin is prepared by mixing the following components in percentage by mass: 40-50% of phenol, 45-57% of formaldehyde, 0.5-1.0% of an alkaline catalyst, 1.0-3.0% of furfuryl alcohol, 0.5-2.0% of urea and 0.01-0.5% of a silane coupling agent.
The alkaline catalyst is an inorganic catalyst, preferably NaOH, KOH or ammonia water.
The silane coupling agent is selected from one or a mixture of A151 (vinyl triethoxysilane), A171 (vinyl trimethoxysilane), A172 (vinyl tri (beta-methoxyethoxy) silane) and the like.
The invention also provides a preparation method of the liquid phenolic resin, which comprises the following steps:
(1) adding a certain amount of phenol, formaldehyde and an alkaline catalyst into a reaction container, carrying out addition condensation polymerization reaction at a constant temperature of 85 +/-1 ℃, cooling when the water solubility ratio reaches 80-100%,
(2) adjusting the pH value to 6.5-7.5, adding urea for polycondensation reaction, then dehydrating under vacuum and negative pressure until the viscosity is 1200-1600 cps,
(3) adding furfuryl alcohol for modification, adjusting the viscosity range to be unchanged, finally adding a silane coupling agent, uniformly stirring, cooling, discharging and storing to obtain the liquid phenolic resin.
In the step (1), the temperature is reduced to below 50 ℃; preferably 40 to 50 ℃, otherwise the free phenol and the solid content are too high or too low.
And (3) in the step (2), adding acid or alkali to adjust the pH value, and then adding urea to perform polycondensation reaction for 20-30 minutes, wherein the acid is selected from formic acid or boric acid.
In the invention, the addition amount of urea is 2.5-3.5% of the mass of phenol, so that free aldehyde in the resin is reduced to a great extent, but excessive urea-formaldehyde resin cannot be generated, and the product performance is reduced; the adding amount of the furfuryl alcohol is 2.5-3% of the mass of the resin, so that the dissolubility of the resin powder is effectively improved when the furfuryl alcohol is taken as a raw material and powder resin for ageing.
The furfuryl alcohol is colorless or light yellow transparent liquid; slightly pungent in taste, miscible with water, but unstable in water; it is very soluble in organic solvents such as alcohol and ether, but insoluble in paraffin. Furfuryl alcohol is easily resinated when it meets acid, and when it is stored in air, its colour becomes dark due to condensation.
The anti-fading cutting grinding wheel is prepared from the following components in parts by weight: 90-110 # of calcined brown corundum, 90-110 # of calcined brown corundum 60, 15-20% of cryolite powder, 8-12% of ferric sulfide, 0.5-1% of carbon black, 40-50% of powdered phenolic resin and 10-15% of liquid phenolic resin.
The powder phenolic resin is prepared by pulverizing solid resin and hexamethylenetetramine according to the mass ratio of 160-180: 20-30, preferably 173: 27, wherein the solid resin is prepared by mixing the following components in percentage by mass: 55-65% of phenol, 30-40% of formaldehyde, 1.0-1.5% of an acid catalyst, 3-5% of water and 0.1-0.5% of a hydrophobic agent.
The powder phenolic resin is prepared by crushing solid resin and hexamethylenetetramine according to the mass ratio of 173: 27, wherein the solid resin is prepared by mixing the following components in percentage by mass: 55-65% of phenol, 30-40% of formaldehyde, 1.0-1.5% of an acid catalyst, 3-5% of water, 0.05-0.2% of a defoaming agent and 0.1-0.5% of a hydrophobic agent.
The acidic catalyst is an organic catalyst, preferably oxalic acid or citric acid; the hydrophobic agent is selected from one or a mixture of more of fluorine-containing silicone oil, a reactive hydrophobic interface modifier and the like; (ii) a The defoaming agent is selected from silicone defoaming agents and polyether defoaming agents.
The preparation method of the powder phenolic resin comprises the following steps:
(1) putting a certain amount of phenol and an acid catalyst into a reaction vessel, adding formaldehyde at the temperature of 90-95 ℃, carrying out reflux reaction for 1.5-2.5 hours at the temperature of 100-102 ℃,
(2) then dehydrating under normal pressure until the temperature reaches 145-155 ℃, then dehydrating under vacuum until the temperature reaches 165-175 ℃, preserving the heat for 1.5-2.5 hours at 165-175 ℃, and meeting the requirements when the free phenol reaches less than or equal to 1.5 percent and the fluidity reaches 25-35 mm,
(3) adding a hydrophobing agent, uniformly stirring, discharging and flaking to obtain thermoplastic phenolic resin, adding hexamethylenetetramine, and powdering to obtain powdery phenolic resin for the grinding wheel;
preferably, after the vacuum dehydration in the step (2) is carried out until the temperature reaches 165-175 ℃, adding a proper amount of defoaming agent, and continuously carrying out heat preservation and vacuum for a period of time.
The invention has the advantages that:
the liquid phenolic resin, the powder phenolic resin, the grinding material and the filler are mixed, molded and cured to prepare the cutting grinding wheel, the pH value of the liquid phenolic resin is adjusted to be neutral, the silane coupling agent can improve the interface performance between the resin and the inorganic grinding material, the powder phenolic resin containing the hydrophobic agent with excellent hydrophobic performance and the powder phenolic resin are selected to be used as the binder of the grinding wheel, and the manufactured grinding wheel can prevent water vapor in the air from invading into the gap between the grinding material and the resin binder in the transportation and storage processes, so that the degradation speed and the interface stripping speed of the resin are reduced, and the anti-fading performance of the grinding wheel is greatly improved. The liquid phenolic resin of the invention is added with the silane coupling agent with the mass of 1.5-2.5 per mill of the resin, so that the caking property between the resin and the inorganic abrasive material is well enhanced during the material mixing, the stability of the grinding wheel product is stronger, and the rotary strength and the cutting performance of the cutting grinding wheel are improved.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.
Example (b): weighing 1000g of phenol into a reaction bottle, adding 50% of NaOH16.5g of solution and 1164g of 37% formaldehyde solution, heating to 85 +/-1 ℃, reacting at constant temperature for 1.5 hours, sampling to detect the water solubility ratio, cooling to below 50 ℃ when the ratio is 98%, adding 4.6g of 88% formic acid solution to adjust the pH to 7.26, adding 24g of urea to react for 30 minutes, dehydrating in vacuum until the viscosity is detected to be 1530cps, adding 40g of furfuryl alcohol, uniformly stirring, measuring the viscosity to be 1300cps, adding 3g of silane coupling agent, uniformly stirring, cooling, discharging and storing.
Comparative example: weighing 1000g of phenol into a reaction bottle, adding 50% of NaOH16.5g of solution and 1164g of 37% formaldehyde solution, heating to 85 +/-1 ℃, reacting at constant temperature for 1.5 hours, sampling to detect the water solubility ratio, cooling to below 50 ℃ when the ratio is 95%, adding 4.6g of 88% formic acid solution to adjust the pH to 7.35, adding 24g of urea to react for 30 minutes, dehydrating in vacuum until the viscosity is 1550cps, adding 40g of furfuryl alcohol, uniformly stirring, measuring the viscosity to 1325cps, cooling, discharging and storing.
And (3) comparison: the comparative example and the example are respectively subjected to material mixing, ageing, molding and high-temperature curing according to the following table 1 to prepare the cutting grinding wheel, and the specific method is the same as the prior art and is not repeated herein; after the ultra-thin cutting grinding wheel finished product with the specification of 125x1.2x22 is prepared, the cutting performance of the two grinding wheels for cutting the phi 16 steel bar at the beginning and after 50 days is tested.
TABLE 1 cutting wheel formulation table
| Raw materials | Weight (kilogram) |
| 46# calcined brown corundum | 50 |
| Calcined brown corundum No. 60 | 50 |
| Cryolite powder | 8 |
| Iron sulfide | 5 |
| Carbon black | 0.5 |
| Powder phenolic resin | 21 |
| Liquid phenolic resin | 6 |
TABLE 2 comparison of grinding wheel cutting performance
| Examples | Number of initial cuts | Number of cuts after 50 days | Reserved value |
| Comparative example | 124 | 87 | 70％ |
| Example 1 | 128 | 116 | 90.6％ |
Note: retention value 50 days later cutting times/initial cutting times 100%
From the comparison of the data in the above table, it can be concluded that:
as can be seen from Table 2, the liquid phenolic resin in the embodiment of the invention has neutral pH value, and is added with the silane coupling agent to prepare the cutting grinding wheel with better cutting performance than the comparative example; can prevent inside steam invades the emery wheel, can effectual improvement emery wheel's decay resistance ability.
In conclusion, the defect of performance decline of the phenolic resin for the grinding wheel is obviously improved by adding the silane coupling agent additive for modification.
The above examples are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. The liquid phenolic resin is prepared by mixing the following components in percentage by mass: 40-50% of phenol, 45-57% of formaldehyde, 0.5-1.0% of an alkaline catalyst, 1.0-3.0% of furfuryl alcohol, 0.5-2.0% of urea and 0.01-0.5% of a silane coupling agent.
2. The liquid phenolic resin of claim 1, wherein the basic catalyst is an inorganic catalyst.
3. The liquid phenolic resin of claim 1, wherein the basic catalyst is one or more of NaOH, KOH or ammonia water.
4. The liquid phenolic resin as claimed in claim 1, wherein the silane coupling agent is selected from one or more of vinyltriethoxysilane, vinyltrimethoxysilane and vinyltris (β -methoxyethoxy) silane.
5. A process for the preparation of a liquid phenolic resin according to any one of claims 1 to 4 comprising the steps of:
(1) adding a certain amount of phenol, formaldehyde and an alkaline catalyst into a reaction container, carrying out addition condensation polymerization reaction at a constant temperature of 85 +/-1 ℃, cooling when the water solubility ratio reaches 80-100%,
(2) adjusting the pH value to 6.5-7.5, adding urea for polycondensation reaction, then dehydrating under vacuum and negative pressure until the viscosity is 1200-1600 cps,
(3) adding furfuryl alcohol for modification, adjusting the viscosity range to be unchanged, finally adding a silane coupling agent, uniformly stirring, cooling, discharging and storing to obtain the liquid phenolic resin.
6. The method according to claim 5, wherein in the step (1), the temperature is reduced to 50 ℃ or lower.
7. The preparation method according to claim 5, wherein in the step (2), acid or alkali is added to adjust the pH value, and then urea is added to perform polycondensation reaction for 20-30 minutes.
8. The anti-fading cutting grinding wheel is prepared from the following components in parts by weight: 90-110 of No. 46 calcined brown corundum, 90-110 of No. 60 calcined brown corundum, 15-20 of cryolite powder, 8-12 of iron sulfide, 0.5-1 of carbon black, 40-50 of powdered phenolic resin and 10-15 of liquid phenolic resin according to any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010685812.XA CN111690107A (en) | 2020-07-16 | 2020-07-16 | Liquid phenolic resin and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112778478A (en) * | 2020-12-30 | 2021-05-11 | 广东省铸力铸材科技有限公司 | Furan resin and preparation method and application thereof |
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| CN107955116A (en) * | 2017-12-27 | 2018-04-24 | 珠海邦瑞合成材料有限公司 | A kind of high solid content resin grinding tool dedicated liquid phenolic resin and preparation method thereof |
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| CN103709349A (en) * | 2013-12-27 | 2014-04-09 | 山东圣泉化工股份有限公司 | Modified phenolic resin |
| CN104497247A (en) * | 2014-12-31 | 2015-04-08 | 珠海邦瑞合成材料有限公司 | Furfuralcohol and urea composite modified water-soluble phenol-formaldehyde resin for resin grinding tool and preparation method of furfuralcohol and urea composite modified water-soluble phenol-formaldehyde resin |
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| CN112778478A (en) * | 2020-12-30 | 2021-05-11 | 广东省铸力铸材科技有限公司 | Furan resin and preparation method and application thereof |
| CN112778478B (en) * | 2020-12-30 | 2023-09-29 | 广东省铸力铸材科技有限公司 | Furan resin and preparation method and application thereof |
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