CN109111681B - Composite resin for casting filter screen, preparation method and application - Google Patents
Composite resin for casting filter screen, preparation method and application Download PDFInfo
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- CN109111681B CN109111681B CN201810955466.5A CN201810955466A CN109111681B CN 109111681 B CN109111681 B CN 109111681B CN 201810955466 A CN201810955466 A CN 201810955466A CN 109111681 B CN109111681 B CN 109111681B
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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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/086—Filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- 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
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
- C08G12/42—Chemically modified polycondensates by etherifying
- C08G12/424—Chemically modified polycondensates by etherifying of polycondensates based on heterocyclic compounds
- C08G12/425—Chemically modified polycondensates by etherifying of polycondensates based on heterocyclic compounds based on triazines
- C08G12/427—Melamine
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- 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
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Phenolic Resins Or Amino Resins (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to a composite resin for a casting filter screen, a preparation method and application thereof, and the preparation method comprises the following steps: the solid polyformaldehyde reacts with phenol under the action of an acid catalyst to obtain a thermoplastic phenolic resin alcohol solution and wastewater, the wastewater reacts with solid formaldehyde and an alkaline catalyst to obtain thermosetting phenolic resin, melamine and the alkaline catalyst are added into the obtained mixture to obtain melamine-formaldehyde resin, and then the thermoplastic phenolic resin alcohol solution is added to obtain methylated melamine-formaldehyde resin, so that a ternary composite resin solution is obtained. The heat resistance and ablation resistance of the composite resin are basically the same as those of single thermoplastic phenolic resin, and the flame retardant property is improved. No wastewater is discharged in the preparation process of the composite resin, and the composite resin basically has no free phenol and free aldehyde; when the composite resin is cured, a urotropine curing agent is not needed, so that the pollution of ammonia and formaldehyde generated during the decomposition of urotropine to the surrounding environment is avoided.
Description
Technical Field
The invention belongs to the technical field of composite resin preparation, and particularly relates to composite resin for a casting filter screen, a preparation method and application.
Background
The filter screen for casting is used for filtering various impurities, slag removing agents and slag caused by various non-metallic substances in high-temperature molten liquid metals such as iron, steel, aluminum and the like in the casting process under the high-temperature condition so as to obtain high-quality castings and reduce the rejection rate of the castings. At present, the filter screen for casting is obtained by using an alcoholic solution of thermoplastic phenolic resin and refractory aggregate as matrixes to impregnate high-silica glass fiber cloth, and then drying at low temperature, curing at high temperature and carbonizing and forming.
At present, the mole ratio of phenol to formaldehyde is less than 1, and the catalyst is an acid catalyst, so that the thermoplastic phenolic resin and the formaldehyde generate linear or branched macromolecules. If liquid formaldehyde is used as raw material, about 600-700 kg of waste water containing free phenol and free aldehyde can be generated per ton of solid thermoplastic phenolic resin, if paraformaldehyde is used as raw material, the waste water amount is only 1/3-1/4 of the amount of liquid formaldehyde, but the content of free phenol and free aldehyde is higher; although the wastewater can be treated by adding excessive formaldehyde to recover phenol into phenolic resin to the maximum extent, the wastewater containing high free aldehyde still needs chemical oxidation and other methods for harmless treatment, and the wastewater treatment process is complex and has higher cost.
Prior application publication No.: CN101235262 introduces an adhesive for a winding type casting filter screen and a preparation method thereof, the adhesive is composed of the following raw materials: 4-7 parts of thermoplastic phenolic resin, 0.3-3 parts of curing agent polyhexamethylene adipamide, 20 parts of industrial ethanol, 0.100-0.525 part of glycidyl methacrylate, 0.100-0.525 part of acrylate and 0.007-0.056 part of Y-chloropropyl methyl diethoxysilane.
Patent CN103214641 discloses a method for producing melamine formaldehyde resin, which solves the problem of wastewater treatment of phenol formaldehyde resin and melamine formaldehyde resin by adding wastewater, paraformaldehyde and methanol into a reaction kettle; patent CN1789327 provides an injection type melamine-phenol-formaldehyde plastic mold prepared by using melamine-phenol-formaldehyde copolymer resin or melamine-formaldehyde resin/phenolic resin blend as matrix resin, inorganic fiber and organic fiber as reinforcing agents, inorganic mineral as filler, and a composite crosslinking curing system; patent CN105315419A provides a preparation method of ablation-resistant boron modified thermoplastic phenolic resin, in the synthesis process, no solvent is used, an effective catalyst is used to make the boron-containing compound fully react, and the boron-containing compound is connected into the resin structure in a copolymerization manner, and the proper reaction temperature and time are controlled to synthesize the boron-containing thermoplastic phenolic resin.
Therefore, there is a need for a method of preparing heat and ablation resistant resins that do not generate waste water for use in the manufacture of casting screens while maintaining the performance requirements of casting screens.
Disclosure of Invention
In view of the problems in the prior art, it is an object of the present invention to provide a method for preparing a composite resin for a casting filter screen. The heat resistance and ablation resistance of the composite resin are basically the same as those of single thermoplastic phenolic resin, and the flame retardant property is improved. No wastewater is discharged in the preparation process of the composite resin, and the composite resin basically has no free phenol and free aldehyde; when the composite resin is cured, a urotropine curing agent is not needed, so that the pollution of ammonia and formaldehyde generated during the decomposition of urotropine to the surrounding environment is avoided.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a preparation method of composite resin for a filter screen for casting comprises the following specific steps:
1) preparation of thermoplastic phenolic resin
Reacting solid formaldehyde with phenol under the action of an acid catalyst to obtain thermoplastic phenolic resin, carrying out normal-pressure water diversion, vacuum dehydration and dephenolization to obtain wastewater A and thermoplastic phenolic resin, cooling the thermoplastic phenolic resin, and adding methanol to dissolve the thermoplastic phenolic resin to obtain a thermoplastic phenolic resin alcohol solution;
2) preparation of thermosetting phenolic resin
Adding solid formaldehyde and an alkaline catalyst into the wastewater A obtained in the step 1), reacting to obtain a mixture C of thermosetting phenolic resin and wastewater B, and adding melamine into the mixture C for reacting to obtain a mixture D of melamine-formaldehyde resin, binary resin of the thermosetting phenolic resin and wastewater;
3) preparation of methylated melamine formaldehyde resin
Adding the thermoplastic phenolic resin alcohol solution obtained in the step 1) into the mixture D, and carrying out a methyl etherification reaction on the melamine formaldehyde resin to obtain a methyl etherified melamine formaldehyde resin, thereby obtaining a ternary composite resin solution of the methyl etherified melamine formaldehyde resin, the thermoplastic phenolic resin and the thermosetting phenolic resin.
Preferably, the molar ratio of phenol to solid formaldehyde in the step 1) is 1: 0.6 to 1.0, adjusting the pH value of the reaction to be 1.0 to 3.0 by using an acid catalyst, controlling the reaction temperature to be 85 to 100 ℃, heating to 105-plus 110 ℃ for reaction after reacting for 1.5 to 2 hours, and carrying out normal-pressure water separation after the reaction; the water is divided under normal pressure until the temperature rises to 120-135 ℃, and then vacuum dephenolization and dehydration are carried out for 10-30 min; cooling to 50-65 deg.C, and adding methanol.
Further preferably, the molar ratio of phenol to solid formaldehyde in the step 1) is 1: 0.75 to 0.80.
Preferably, the main components of the wastewater A in the step 1) are free phenol, free aldehyde and water.
Preferably, the acid in the acidic catalyst in the step 1) is an inorganic acid or an organic acid, and the inorganic acid is hydrochloric acid, sulfuric acid and phosphoric acid; the organic acid is oxalic acid.
Further preferably, the acid catalyst is oxalic acid, hydrochloric acid or a mixture of the two, and the mass of the oxalic acid or the hydrochloric acid is 0.25% -1% of that of the phenol.
Preferably, the mass ratio of the wastewater A, the solid formaldehyde and the melamine in the step 2) is 100-150: 25-75: 50-100, adjusting the pH value to 9-10 by using an alkaline catalyst, and reacting: heating the wastewater and paraformaldehyde to 60-100 ℃, and reacting for 20min-2 hours; cooling to a temperature lower than 60 ℃, adding melamine, heating to 60-90 ℃, dissolving the melamine, and then preserving heat for 10-30 min; the main components of the wastewater B are formaldehyde and water.
Further preferably, the reaction temperature of the wastewater and the solid formaldehyde in the step 2) is 70-90 ℃, and the reaction time is 30min-1.5 h; the temperature at which melamine reacts with mixture C is 70-80 ℃.
Preferably, the base in the basic catalyst in step 2) is an inorganic base or an organic base, the inorganic base is an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide, and the organic base is an organic amine including primary, secondary and tertiary amines; further preferably, the organic amine is triethylamine or ethylenediamine.
Preferably, the temperature of the methyl etherification reaction in the step 3) is 40-70 ℃, and the reaction time is 20-60 min; further preferably, the temperature of the methyl etherification reaction is 50-60 ℃, and the reaction time is 30-50 min.
The ternary composite resin solution is prepared by the method.
The ternary composite resin solution is used as a binder in a casting filter screen.
A filter screen for casting is prepared from the ternary composite resin solution, methanol, refractory aggregate and high-silica glass fiber.
The invention has the beneficial effects that:
1) the invention prepares the ternary composite resin of methylated melamine formaldehyde resin, thermoplastic phenolic resin and thermosetting phenolic resin, the composite resin still keeps the heat resistance and ablation resistance of the original thermoplastic phenolic resin and has certain flame retardant property;
2) the preparation method of the ternary composite resin has no wastewater discharge in the process, and simultaneously the obtained composite resin basically has no free phenol and free aldehyde, the mass content of the free phenol in the obtained composite resin is less than 0.3 percent, and the mass content of the free aldehyde is less than 0.1 percent;
3) compared with the prior art that the thermoplastic phenolic resin takes the urotropine as the curing agent, the melamine-formaldehyde resin and the thermosetting phenolic resin are taken as the curing agent of the thermoplastic phenolic resin in the curing process of the ternary composite resin, so that the problem of environmental pollution caused by ammonia and formaldehyde generated when the urotropine is decomposed in the preparation process of the filter screen is avoided.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application.
The invention will be further illustrated by the following examples
EXAMPLE 1 Alcoholic solution of thermoplastic phenolic resin Single resin
(1) Adding 600g of phenol, 150g of 95% solid formaldehyde and 3.0g of oxalic acid into a reactor, heating to 85-90 ℃, preserving heat for reaction for 1.5-2 hours, heating to 105-110 ℃, preserving heat for 1-1.5 hours, after preserving heat for 1 hour, sampling, dripping into water, and depositing on the bottom in a diffusion shape, changing the device into normal pressure water separation, when the temperature rises to 130 ℃, changing the device into a vacuum state, dephenolizing and dehydrating, keeping the vacuum state, the temperature rises to 150 ℃ for about 20 minutes, cooling to 60 ℃, slowly adding 300g of methanol for dissolution while continuously keeping a cooling state, and finally adding 80 g of urotropine to obtain about 1030g of a thermoplastic phenolic resin methanol solution with the urotropine and simultaneously obtain about 100g of wastewater;
according to the type of the cast filter screen, the resin obtained in the embodiment 1, methanol and other refractory aggregates are used for preparing slurry according to the proportion required by the manufacturing process of an aluminum net, an iron net or a steel net, high silica glass fiber is impregnated, and then drying, curing and carbonizing are carried out under different temperature and time conditions, so that various cast filter screens are prepared.
Example 2 composite resin 1
(1) Adding 400g of phenol, 110g of 95% solid formaldehyde and 2.0g of oxalic acid into a reactor, heating to 85-90 ℃, preserving heat for reaction for 1.5-2 hours, heating to 105-90 ℃, preserving heat for 1-1.5 hours at 110 ℃, after preserving heat for 1 hour, sampling, dripping into water, and precipitating at the bottom in a diffusion manner, changing the device into normal-pressure water separation, when the temperature rises to 135 ℃, changing the device into a vacuum state, performing dephenolization and dehydration, keeping the vacuum state, raising the temperature to 145 ℃ for about 20 minutes, cooling to 55 ℃, and slowly adding 150g of methanol while continuously keeping the cooling state, finally obtaining about 600g of a thermoplastic phenolic resin methanol solution, and simultaneously obtaining about 60g of wastewater;
(2) 60g of wastewater and 50g of 95% paraformaldehyde, adjusting the pH value to 9-10 with liquid alkali, heating to 85-90 ℃, keeping the temperature, reacting for 1 hour, cooling to below 60 ℃, adding 65g of melamine, heating to 70-80 ℃, and keeping the temperature for 20 minutes after the melamine is dissolved;
(3) adding about 600g of thermoplastic phenolic resin alcoholic solution, keeping the temperature at 50-60 ℃ for about 30 minutes, cooling, and discharging to obtain the ternary composite resin.
According to the type of the cast filter screen, the composite resin 1 obtained in the embodiment 2, methanol and other refractory aggregate are used for preparing slurry according to the proportion required by the manufacturing process of an aluminum net, an iron net or a steel net, high silica glass fiber is impregnated, and then drying, curing and carbonizing are carried out under the conditions of different temperatures and time, so that various cast filter screens are prepared.
Example 3 composite resin 2
(1) To the reactor was added 600g phenol, 95% solid formaldehyde: 160g and 3.0g of oxalic acid are heated to 80-85 ℃ for heat preservation reaction for 1.5-2 hours, then the temperature is raised to 105-plus 110 ℃ for heat preservation for 1-1.5 hours, after the heat preservation is carried out for 1 hour, a sample is sampled and dripped into water to be diffused and sink to the bottom, the device is changed into normal pressure water diversion, when the temperature is raised to 125 ℃, the device is changed into a vacuum state for dephenolization and dehydration, the temperature is raised to 140 ℃ for about 20 minutes in the vacuum state, the temperature is lowered to 60 ℃, and 250g of methanol is slowly added under the condition of continuously keeping the cooling state, and finally about 900g of thermoplastic phenolic resin methanol solution is obtained, and about 100g of waste water is obtained at the same time;
(2) 100g of wastewater and 75g of 95% paraformaldehyde, adjusting the pH value to 9-10 with liquid alkali, heating to 85-90 ℃, keeping the temperature, reacting for 1 hour, cooling to below 60 ℃, adding 100g of melamine, heating to 70-80 ℃, and keeping the temperature for 20 minutes after the melamine is dissolved;
(3) adding about 900g of thermoplastic phenolic resin alcohol solution, keeping the temperature at 50-60 ℃ for about 30 minutes, cooling, and discharging to obtain the ternary composite resin.
According to the type of the cast filter screen, the composite resin 2 obtained in the embodiment 3, methanol and other refractory aggregate are used for preparing slurry according to the proportion required by the manufacturing process of an aluminum net, an iron net or a steel net, high silica glass fiber is impregnated, and then drying, curing and carbonizing are carried out under the conditions of different temperatures and time, so that various cast filter screens are prepared.
And (3) performance characterization:
the single resin and the composite resin prepared in the examples 1 to 3 were subjected to mesh detection in a muffle furnace at 800 ℃ in a 650 ℃ molten aluminum crucible for aluminum mesh and iron mesh prepared by different processes, and the normal temperature strength, toughness, high temperature ignition property, smoke generation amount and other indexes of the mesh were detected, and the results were as follows:
the result shows that the performance of the cast filter screen made of the composite resin is basically as good as that of the filter screen made of the existing thermoplastic phenolic resin, and the cast filter screen can meet the filtering use requirement of the existing casting industry.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (15)
1. A preparation method of composite resin for a filter screen for casting is characterized by comprising the following steps: the method comprises the following specific steps:
1) preparation of thermoplastic phenolic resin
Reacting solid formaldehyde with phenol under the action of an acid catalyst to obtain thermoplastic phenolic resin, carrying out normal-pressure water diversion, vacuum dehydration and dephenolization to obtain wastewater A and thermoplastic phenolic resin, cooling the thermoplastic phenolic resin, and adding methanol to dissolve the thermoplastic phenolic resin to obtain a methanol solution of the thermoplastic phenolic resin;
2) preparation of thermosetting phenolic resin
Adding polyformaldehyde and an alkaline catalyst into the wastewater A obtained in the step 1), reacting to obtain a mixture C of thermosetting phenolic resin and wastewater B, and adding melamine into the mixture C for reacting to obtain a mixture D of melamine-formaldehyde resin, binary resin of thermal solid phenolic resin and wastewater;
3) preparation of methylated melamine formaldehyde resin
Adding the methanol solution of the thermoplastic phenolic resin obtained in the step 1) into the mixture D, and carrying out a methyl etherification reaction on the melamine formaldehyde resin to obtain a methyl etherified melamine formaldehyde resin, thereby obtaining a ternary composite resin solution of the methyl etherified melamine formaldehyde resin, the thermoplastic phenolic resin and the thermosetting phenolic resin.
2. The method for preparing the composite resin for the casting filter screen according to claim 1, wherein the method comprises the following steps: the molar ratio of phenol to solid formaldehyde in the step 1) is 1: 0.6-1.0 percent of acid catalyst, the pH value of the reaction is 1.0-3.0, the reaction temperature is 85-100 ℃, the temperature is increased to 105-110 ℃ for reaction after the reaction is carried out for 1.5-2 hours, and normal pressure water diversion is carried out after the reaction; the water is divided under normal pressure until the temperature rises to 120-135 ℃, and then vacuum dephenolization and dehydration are carried out for 10-30 min; cooling to 50-65 deg.C, and adding methanol.
3. The method for preparing the composite resin for the casting filter screen according to claim 2, wherein the method comprises the following steps: the molar ratio of phenol to solid formaldehyde in the step 1) is 1: 0.75 to 0.80.
4. The method for preparing the composite resin for the casting filter screen according to claim 1, wherein the method comprises the following steps: the main components of the wastewater A in the step 1) are free phenol, free aldehyde and water.
5. The method for preparing the composite resin for the casting filter screen according to claim 1, wherein the method comprises the following steps: the acid catalyst in the step 1) is inorganic acid or organic acid, and the inorganic acid is hydrochloric acid, sulfuric acid and phosphoric acid; the organic acid is oxalic acid.
6. The method for preparing the composite resin for the casting filter screen according to claim 5, wherein the method comprises the following steps: the acid catalyst is oxalic acid and hydrochloric acid, and the mass of the oxalic acid or the hydrochloric acid is 0.25-1% of that of the phenol.
7. The method for preparing the composite resin for the casting filter screen according to claim 1, wherein the method comprises the following steps: the mass ratio of the wastewater A, the paraformaldehyde and the melamine in the step 2) is 100-150: 25-75: 50-100, the pH value of the reaction is 9-10, and the reaction process is as follows: heating to 60-100 ℃, reacting for 20min-2 h, cooling to a temperature less than 60 ℃, adding melamine for reaction, heating to 60-90 ℃, and preserving heat for 10-30min after dissolving the melamine; the main components of the wastewater B are formaldehyde and water.
8. The method for preparing the composite resin for the casting filter screen according to claim 1, wherein the method comprises the following steps: the reaction temperature of the wastewater A and the paraformaldehyde in the step 2) is 70-90 ℃, and the reaction time is 30min-1.5 h; the reaction temperature after the addition of melamine is 70-80 ℃.
9. The method for preparing the composite resin for the casting filter screen according to claim 1, wherein the method comprises the following steps: the alkaline catalyst in the step 2) is inorganic base or organic base, the inorganic base is sodium hydroxide or potassium hydroxide, the organic base is organic amine, and the organic amine is selected from primary amine, secondary amine and tertiary amine.
10. The method for preparing the composite resin for the casting filter screen according to claim 9, wherein the method comprises the following steps: the organic amine is triethylamine or ethylenediamine.
11. The method for preparing the composite resin for the casting filter screen according to claim 1, wherein the method comprises the following steps: the temperature of the methyl etherification reaction in the step 3) is 40-70 ℃, and the reaction time is 20-60 min.
12. The method for preparing the composite resin for the casting filter screen according to claim 11, wherein the method comprises the following steps: the temperature of the methyl etherification reaction in the step 3) is 50-60 ℃, and the reaction time is 30-50 min.
13. The method of preparing a composite resin according to any one of claims 1 to 12, to obtain a ternary composite resin solution.
14. Use of the ternary complex resin solution of claim 13 as a binder in a casting screen.
15. The utility model provides a filter screen is used in casting which characterized in that: prepared from the composite resin solution of claim 13, methanol, refractory aggregate and high silica glass fiber.
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2018
- 2018-08-21 CN CN201810955466.5A patent/CN109111681B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| US3932334A (en) * | 1973-09-24 | 1976-01-13 | Deuzeman Hendrik H J | Calcia catalyzed resins |
| EP1013684B1 (en) * | 1998-12-15 | 2003-04-23 | Nec Corporation | Flame retardant resin material and flame retardant resin composition |
| US7235613B2 (en) * | 2001-10-18 | 2007-06-26 | Akzo Nobel N.V. | Method of gluing wood based materials |
| CN104086947A (en) * | 2014-07-15 | 2014-10-08 | 上海欧亚合成材料有限公司 | Phenol aldehyde molding compound for commutators |
| CN106496927A (en) * | 2016-11-03 | 2017-03-15 | 华东理工大学 | A kind of low-density ablation heat insulation type composite and preparation method thereof |
| CN106751454A (en) * | 2016-12-30 | 2017-05-31 | 珠海邦瑞合成材料有限公司 | A kind of superthin section emery wheel liquid phenolic resin and preparation method thereof |
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| highly branched melamine-phenolic novolaks;Maciejewski, M et al;《POLYMER BULLETIN》;20020531;第48卷(第3期);第251-259页 * |
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