CN110564004B - Preparation method for reprocessing rubber and plastic filler by recycling waste resin molding sand - Google Patents
Preparation method for reprocessing rubber and plastic filler by recycling waste resin molding sand Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- 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
- C08K9/00—Use of pretreated ingredients
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
Abstract
The invention discloses a preparation method of reclaimed waste resin molding sand reprocessed rubber and plastic filler, belonging to the technical field of molding sand reclamation, and the invention discloses a preparation method of reclaimed waste resin molding sand reprocessed rubber and plastic filler, wherein the prepared reprocessed rubber and plastic filler has low cost, avoids the problems of pollution and low efficiency of the former reclamation mode, recycles the waste resin molding sand, ensures that the waste resin molding sand is properly utilized, has nearly 100 percent of reclamation rate, high reclamation efficiency, simple process, low cost and high added value, solves the outstanding problem of reclamation of the waste resin molding sand, indirectly prepares the rubber and plastic filler with good comprehensive performance and excellent comprehensive performance, and is suitable for large-scale popularization.
Description
Technical Field
The invention belongs to the technical field of molding sand recovery, and particularly relates to a preparation method for recovering waste resin molding sand and reprocessing rubber and plastic filler.
Background
The recovery of sand materials has become prevalent in the last decade. Due to the hope of reducing the cost of raw materials, the cost of cleaning, transporting and dumping waste, the waste treatment is increased according to environmental regulations, most waste sands contain toxic substances and other factors, and the technical requirements of recycling and reusing the molding sand are indirectly improved. Many foundries are equipped with reclamation to allow sand and clay to be recycled. However, the main recovery methods at present are: grinding, heat treatment, wet washing, pneumatic washing and grinding. Most of the technologies need to further process and segment the mineral particles so as to control the fineness of the reclaimed material and keep the maximum particle size distribution, but the above methods can not achieve the technical purpose of 100% recovery, and the recovery of reclaimed sand generates flue gas and has poor performance. The scrub sand is dewatered and re-classified many times after drying but effluent liquid waste treatment and large batch drying are still problematic. The mixed rotary grinding of multiple processing equipment can't get rid of the fine powder and carry out the sand grading, and waste molding sand does not obtain proper recycle, and pneumatic grinding scrubbing, waste water discharge problem etc. are showing the defect and are touching the amazing harm very big more, and the molding sand of retrieving must mix and add new sand and can obtain utilizing, and the purpose that the old and useless molding sand used can just be reluctantly reached in continuous replenishment. Therefore, a need exists in the art for a novel method for preparing a rubber-plastic filler reprocessed by recycling waste molding sand from waste molding sand, so as to solve the problem of recycling treatment of a large amount of waste molding sand in the market, and simultaneously, prepare a low-cost and efficient waste molding sand rubber-plastic filler for recycling, widen the recycling space of waste molding sand, and provide a rubber-plastic filler with excellent comprehensive properties and low cost.
Disclosure of Invention
The invention aims to provide a preparation method for recycling waste resin molding sand and reprocessing rubber and plastic filler aiming at the existing problems.
The invention is realized by the following technical scheme:
a preparation method for reprocessing rubber and plastic filler by recycling waste resin molding sand comprises the following steps:
(1) firstly, after resin molding sand waste is aged for 30-42 h in a xenon lamp at the temperature of-15-10 ℃, starting a ball mill device and grinding and crushing, then adding the ball mill device and a chloroform solvent, triethylamine, coconut oil fatty acid diethanolamide and an alkaline detergent composition into a reaction kettle, carrying out ultrasonic treatment and sealed heating to 30-50 ℃ under the stirring action, carrying out heat preservation for 1-2 hours, then cooling to room temperature, starting the ball mill device and grinding and crushing, and sieving by a 200-mesh sieve to obtain a powdery chloroform dispersion; the microwave heating power is 250-300W, the frequency is 40-60 kHz, and the microwave heating equipment comprises the following raw materials in parts by weight: 120-140 parts of resin molding sand waste, 65-83 parts of chloroform solvent, 3.5-4.5 parts of triethylamine, 0.8-1.2 parts of ethylene glycol, 30-50 parts of deionized water and 3-5 parts of alkaline detergent composition to obtain molding sand powder chloroform mixture;
(2) adding 110-135 parts of the molding sand powder chloroform mixture obtained in the step (1) into a reaction kettle, cooling to-5 ℃, adding 112-116 parts of water into the mixture, shaking for layering, removing a chloroform layer, putting the chloroform layer into a Soxhlet extractor for recycling, distilling and recycling chloroform, then leaving a water layer in the reaction kettle, filtering water to obtain a filtered water and molding sand solid mixture for later use, starting a stirring paddle at the bottom of the reaction kettle to uniformly disperse the powder dispersion, stirring for reaction for 1-2 h, adding a pickling solution, continuing to heat 22-33 parts of the chloroform layer, keeping the temperature of the system at 65-75 ℃, strongly stirring for 4-5 h, discharging when the temperature of the materials is reduced to below 30 ℃ after the reaction is finished, adding filtered water, stirring for 0.5-1 h, filtering to remove water to obtain solid molding sand, drying and dehydrating at the temperature of 50-60 ℃ and the pressure of 10-15 kPa for 1-3 h, finally obtaining molding sand powder;
(3) adding 100-110 parts of molding sand powder, 10-15 parts of silane coupling agent solution and 0.1-0.2 part of molybdenum sulfide dialkyl dithiocarbamate into a reaction kettle, connecting a corresponding stirring device and a corresponding heating device, slowly heating to 110-115 ℃, adding 1.8-2.5 parts of methacrylate preheated to 110-115 ℃ into a reaction kettle, carrying out heat preservation reaction for 1-2 h, then cooling to 80-85 ℃, adding 0.01-0.1 part of catalyst, carrying out heat preservation reaction for 30min, adding 0.01-0.1 part of chain extender, 0.01-0.2 part of dispersant and 0.01-0.2 part of heat stabilizer, stirring uniformly, discharging, curing for 2-3 h at 120-130 ℃, then sending into a 120-150 ℃ mixing roll, wherein the rotating speed of the mixing roll is 30-80 r/min, the top plug pressure is 1.8-2.3 kg/square centimeter, and the working capacity rate is 50-60%, thus obtaining the recycled waste resin molding sand reprocessed rubber and plastic filler.
Further, in the step (1), the xenon lamp and the ozone are aged to be 55-60W/m under the condition that the irradiance is 340nm2Relative humidity is 40-60%, rainfall period: and (3) drying for 18min in a spraying/102 min mode, wherein the ozone concentration is 50-300 ppm, and the double effects of the xenon lamp and the ozone are achieved.
Further, the catalyst in the step (3) is one of azobisisobutyrimidazoline hydrochloride and ammonium persulfate; the dispersant in the step (3) is one of monocarbodiimide and coconut oil fatty acid diethanolamide; and the chain extender in the step (3) is one of ethylene diamine sodium hexanesulfonate or polypropylene glycol-diamine-sulfopropyl sodium salt.
Further, the stabilizer in the step (3) is one or more of isopropyl palmitate, triphenyl phosphite and calcium ricinoleate.
Further, the silane coupling agent solution in the step (3) is a gamma-isocyanatopropyl trimethoxy silane ethanol solution with the mass fraction of 3-5%.
Further, the pickling solution in the step (2) is sodium periodate, sulfuric acid and nitric acid according to the weight ratio of 1-2: 2-3: 3-4, the sulfuric acid is a sulfuric acid solution with the mass fraction of 20-25%, the nitric acid is a nitric acid solution with the mass fraction of 15-20%, and the alkaline detergent composition is sodium hydroxide and sodium carbonate according to the weight ratio of 1: 1.
The invention has the beneficial effects that:
the invention provides a new recovery method aiming at the prior recovered waste resin molding sand from the waste resin containing high polymer raw materials such as resin and the like, which is not properly treated, has strong water and soil environmental pollution threats, and aims at the prior recovered waste resin molding sand according to the principle of swelling and dissolving of high polymer compounds, xenon lamps and ozone aging separate the framework material of the molding sand from polymer bonding components, the mechanical strength of the molding sand is quickly and efficiently reduced by utilizing the degradation characteristic of the high polymer compounds, the waste resin molding sand particles are softened by adopting monomer solvent chloroform, the polymer resin is loosened and partially swelled under the action of the chloroform under the low temperature condition, the silicon sand and the like comprising inorganic particles of the molding sand are separated from the polymer resin, and the waste resin type molding sand components are easier to separate, the abrasion resistance and strength of the resin molding sand component are reduced in the process, the resin molding sand can be ground in a ball mill to reduce the particle size, the triethylamine and the alkaline composition are added to promote the dispersion of particles, and then acid cleaning treatment is carried out, the resin molding sand containing furan resin and phenolic resin can be effectively treated, the resin molding sand can be well treated after acid and alkali treatment, ozone treatment and previous xenon lamp aging are carried out, chloroform, triethylamine and the alkaline composition, ethylene glycol can be used as a swelling aid, surface grafting polymerization modification and coupling agent surface treatment are carried out on the resin molding sand to block the movement of chain segments, the processing cost is reduced, the resin molding sand can be quickly ground, the resin molding sand with high recovery rate is recycled, and the resin molding sand serving as rubber and plastic filler contains a resin binder matrix component and can better disperse rubber and plastic, the method is simple and practical, has low cost and high return rate, not only solves the outstanding problem of recycling waste resin molding sand, but also indirectly prepares the rubber and plastic filler with good wear resistance and excellent comprehensive performance, and is favorable for large-scale popularization.
Compared with the prior art, the invention has the following advantages:
the rubber-plastic filler prepared by the preparation method disclosed by the invention has a very obvious reinforcing effect and low cost, avoids the problems of pollution and low efficiency of the conventional recovery mode, recycles the waste resin molding sand to ensure that the waste resin molding sand is properly utilized, has the recovery rate of nearly 100 percent, has high recovery efficiency, low cost and high added value, and mainly reflects the characteristics of the waste resin molding sand and the effect after surface modification. Because the molding sand has a resin matrix, after treatment, the void ratio of molding sand particles is increased, the capability of wrapping the filler by the rubber matrix is stronger, the specific surface area is increased, and the same effect is also generated after the resin which is not burnt out in the molding sand is treated by acid and alkali. And the surface graft polymerization and surface modification are carried out on the rubber filler, so that the rubber filler can play a certain reinforcing and crosslinking effect when being added into a rubber product, obtains better mechanical property, has prominent application effect, improves the mechanical property and heat resistance of rubber and plastic, and has good weather resistance.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
A preparation method for reprocessing rubber and plastic filler by recycling waste resin molding sand comprises the following steps:
(1) firstly, after resin molding sand waste is aged for 30 hours at the temperature of-15 ℃ by a xenon lamp and aged by ozone, starting a ball mill device and grinding and crushing, then adding the ball mill device, a chloroform solvent, triethylamine, coconut oil fatty acid diethanolamide and an alkaline detergent composition into a reaction kettle, carrying out ultrasonic treatment and sealed heating to 30 ℃ under the stirring action, cooling to room temperature after heat preservation for 1 hour, starting the ball mill device and grinding and crushing, and sieving by a 200-mesh sieve to obtain a powdery chloroform dispersion; the microwave heating power is 300W, the frequency is 60kHz, and the microwave heating equipment comprises the following raw materials in parts by weight: 140 parts of resin molding sand waste, 83 parts of chloroform solvent, 4.5 parts of triethylamine, 1.2 parts of ethylene glycol, 50 parts of deionized water and 5 parts of alkaline detergent composition to obtain molding sand powder chloroform mixture;
(2) adding 135 parts of the molding sand powder chloroform mixture obtained in the step (1) into a reaction kettle, cooling to 5 ℃, adding 116 parts of water into the mixture, shaking for layering, removing a chloroform layer, putting the chloroform layer into a Soxhlet extractor for recycling, distilling and recycling the chloroform, leaving a water layer in the reaction kettle, filtering the water to obtain a filtered water and molding sand solid mixture for later use, starting a stirring paddle at the bottom of the reaction kettle to uniformly disperse the powder dispersion, stirring for 1 hour, adding a pickling solution, continuing to heat 33 parts of the chloroform layer to keep the system temperature at 65 ℃, strongly stirring for 4 hours, after the reaction is finished, discharging when the material temperature is reduced to below 30 ℃, adding the filtered water, stirring for 0.5 hour, filtering again to remove the water to obtain solid molding sand, and drying and dehydrating at the temperature of 60 ℃ and the pressure of 10kPa for 1 hour to finally obtain molding sand powder;
(3) adding 100 parts of molding sand powder, 15 parts of silane coupling agent solution and 0.2 part of molybdenum sulfide dialkyl dithiocarbamate into a reaction kettle, connecting a corresponding stirring device and a corresponding heating device, slowly heating to 115 ℃, adding 2.5 parts of methacrylate preheated to 115 ℃ into the reaction kettle, carrying out heat preservation reaction for 2 hours, then cooling to 85 ℃, adding 0.1 part of catalyst, carrying out heat preservation reaction for 30 minutes, adding 0.1 part of chain extender, 0.2 part of dispersing agent and 0.2 part of heat stabilizer, uniformly stirring, discharging, curing for 3 hours at 130 ℃, then sending into a mixing mill at 150 ℃, rotating speed of the mixing mill being 80 r/min, top bolt pressure being 2.3 kg/cm and working capacity rate being 60%, and obtaining the recycled waste resin molding sand rubber and plastic filler.
Further, in the step (1), the xenon lamp and the ozone are aged to 60W/m at the irradiance of 340nm2Relative humidity 60%, rainfall period: spraying for 18min, drying for 102min, and subjecting to dual effects of xenon lamp and ozone under the condition of ozone concentration of 300 ppm.
Further, the catalyst in the step (3) is azobisisobutyrimidazoline hydrochloride; the dispersant in the step (3) is coconut oil fatty acid diethanolamide; and the chain extender in the step (3) is ethylenediamine hexanesulfonic acid sodium.
Further, the stabilizer in the step (3) is one or more of calcium ricinoleate.
Further, the silane coupling agent solution in the step (3) is a gamma-isocyanatopropyl trimethoxy silane ethanol solution with the mass fraction of 5%.
Further, the pickling solution in the step (2) is sodium periodate, sulfuric acid and nitric acid according to the weight ratio of 1: 2: 3, the sulfuric acid is a sulfuric acid solution with the mass fraction of 25%, the nitric acid is a nitric acid solution with the mass fraction of 20%, and the alkali wash composition is sodium hydroxide and sodium carbonate according to the weight ratio of 1: 1.
Example 2
A preparation method for reprocessing rubber and plastic filler by recycling waste resin molding sand comprises the following steps:
(1) firstly, after resin molding sand waste is aged for 42 hours at 10 ℃ by a xenon lamp and aged by ozone, starting a ball mill device and grinding and crushing, then adding the ball mill device, a chloroform solvent, triethylamine, coconut oil fatty acid diethanolamide and an alkaline detergent composition into a reaction kettle, carrying out ultrasonic treatment and sealed heating to 30 ℃ under the stirring action, cooling to room temperature after preserving heat for 2 hours, starting the ball mill device and grinding and crushing, and sieving by a 200-mesh sieve to obtain a powdery chloroform dispersion; the microwave heating power is 300W, the frequency is 60kHz, and the microwave heating equipment comprises the following raw materials in parts by weight: 140 parts of resin molding sand waste, 65 parts of chloroform solvent, 3.5 parts of triethylamine, 0.8 part of ethylene glycol, 30 parts of deionized water and 3 parts of alkaline detergent composition to obtain molding sand powder chloroform mixture;
(2) adding 135 parts of the molding sand powder chloroform mixture obtained in the step (1) into a reaction kettle, cooling to 5 ℃, adding 116 parts of water into the mixture, shaking for layering, removing a chloroform layer, putting the chloroform layer into a Soxhlet extractor for recycling, distilling and recycling the chloroform, leaving a water layer in the reaction kettle, filtering the water to obtain a filtered water and molding sand solid mixture for later use, starting a stirring paddle at the bottom of the reaction kettle to uniformly disperse the powder dispersion, stirring for 2 hours, adding a pickling solution, continuing to heat 33 parts of the chloroform layer to keep the system temperature at 75 ℃, strongly stirring for 5 hours, after the reaction is finished, discharging when the material temperature is reduced to below 30 ℃, adding the filtered water, stirring for 1 hour, filtering to remove the water to obtain solid molding sand, and drying and dehydrating at the temperature of 60 ℃ under the pressure of 15kPa for 3 hours to obtain molding sand powder;
(3) adding 110 parts of molding sand powder, 15 parts of silane coupling agent solution and 0.2 part of molybdenum sulfide dialkyl dithiocarbamate into a reaction kettle, connecting a corresponding stirring device and a corresponding heating device, slowly heating to 115 ℃, adding 2.5 parts of methacrylate preheated to 1115 ℃ into the reaction kettle, carrying out heat preservation reaction for 2 hours, then cooling to 85 ℃, adding 0.1 part of catalyst, carrying out heat preservation reaction for 30 minutes, adding 0.1 part of chain extender, 0.2 part of dispersing agent and 0.2 part of thermal stability, uniformly stirring, discharging, curing for 3 hours at 130 ℃, then sending into a mixing mill at 150 ℃, carrying out rotation speed of the mixing mill at 80 r/min, carrying out top plug pressure at 1.8 kg/cm and working capacity rate at 60%, thus obtaining the recycled waste resin molding sand rubber and plastic filler.
Further, in the step (1), the xenon lamp and the ozone are aged to 60W/m at the irradiance of 340nm2Relative humidity 40%, rainfall period: spraying for 18min, drying for 102min, and subjecting to dual effects of xenon lamp and ozone under the condition of ozone concentration of 50 ppm.
Further, the catalyst in the step (3) is ammonium persulfate; the dispersant in the step (3) is coconut oil fatty acid diethanolamide; and the chain extender in the step (3) is polypropylene glycol-diamine-sulfopropyl sodium salt.
Further, the stabilizer in the step (3) is isopropyl palmitate.
Further, the silane coupling agent solution in the step (3) is a gamma-isocyanatopropyl trimethoxy silane ethanol solution with the mass fraction of 3%.
Further, the pickling solution in the step (2) is sodium periodate, sulfuric acid and nitric acid according to the weight ratio of 2: 3: 4, the sulfuric acid is a sulfuric acid solution with the mass fraction of 20%, the nitric acid is a nitric acid solution with the mass fraction of 15%, and the alkali wash composition is sodium hydroxide and sodium carbonate according to the weight ratio of 1: 1.
Comparative example 1
This comparative example is compared with example 2, and in step (3), the silane coupling agent solution components are omitted, except that the process steps are the same.
Comparative example 2
In this comparative example, as compared with example 2, in step (2), the pickling solution was omitted, and the process steps were the same except for this.
Comparative example 3
In comparison with example 2, in step (1), xenon lamp aging and ozone aging were omitted, except that the other process steps were the same.
Comparative example 4
This comparative example compares to example 2 in step (3) the chain extender component is omitted except that the process steps are otherwise the same.
Comparative example 5
This comparative example compares to example 2 in step (1) the alkaline detergent composition is omitted except that the process steps are otherwise the same.
TABLE 1 Performance test results of recycled waste resin molding sand reprocessed rubber and plastic filler in examples and comparative examples
Oil absorption number according to GB 5211.15; the pH value is carried out according to GB/T1325 mesh screen residue GB/T5211.14-1988; the weight loss value at 105 ℃ is carried out according to GB/T5221.3-1985; the granularity is determined according to GB/T145632008 kaolin and the determination method of 5.3 physical property and moisture in the test method;
TABLE 2 Performance test results of recycled waste resin molding sand reprocessed rubber and plastic filler filled thermoplastic elastomer in each example and comparative example
Note: the testing method comprises the steps of placing 321.4 parts of the reclaimed waste resin molding sand reprocessing rubber and plastic filler of the molding sand of each proportion and embodiment in a constant-temperature oven at 120 ℃ for drying for 30min, taking out the filler, and placing the filler in a dryer for cooling to room temperature for later use. Adding 300 parts of paraffin oil 150 into SEBSYH-503, mixing and stirring for 1h, adding a rubber plastic filler and PPH-T03, uniformly mixing, standing for 3h, adding the mixed raw materials into a double-screw extruder, melting, extruding and granulating, wherein the extrusion processing temperature is 180 ℃, and then carrying out injection molding on the granules by a vertical injection molding machine to obtain standard sample strips, wherein the injection molding temperature is 210 ℃ for later use.
TABLE 3 Performance test results of reclaimed waste resin molding sand reprocessed rubber and plastic filler filled nitrile rubber in each example and comparative example
Note: the testing method adopts the high-temperature-resistant thermal shock casting molding sand filler of the comparative example and the embodiment, and adopts an SK-160B type two-roll rubber mixing mill produced by Shanghai rubber machinery factory to respectively pass 100 parts of nitrile rubber N220S through rolls at room temperature, adjust the roll gap, plasticate for 5 times, gradually add 30 parts of dioctyl phthalate, 90 parts of sand recovery waste resin molding sand reprocessing rubber and plastic filler, 1.5 parts of zinc oxide 5 stearic acid, 1.5 parts of N-cyclohexyl-2-benzothiazole sulfonamide, 1.5 parts of tetramethyl thiuram disulfide and 1.5 parts of 4,4' -dioctyl diphenylamine, thin pass for 10 times, finally add 0.3 parts of sulfur, thin pass for several times, roll up, stand for 24 hours in a room temperature environment, press the mixed green rubber into sheets, the first-stage vulcanization temperature is 165 ℃,10min and the pressure is 10 MPa; the secondary vulcanization temperature is 200 ℃,4h and normal pressure, the secondary vulcanization is carried out in a high-temperature oven, and the test is carried out after the state adjustment. Table 2 and table 3 reference standards are: measuring the tensile stress strain performance of GB/T528-2008 vulcanized rubber or thermoplastic rubber; determination of the tear Strength of the vulcanized rubber or thermoplastic rubber of GB/T529-2008 (trouser, Right Angle and crescent shaped test specimens); measuring the bonding strength between the GB/T532-2008 vulcanized rubber or thermoplastic rubber and the fabric; measuring the density of GB/T533-2008 vulcanized rubber or thermoplastic rubber; GB/T2410-2008 transparent plastic light transmittance and haze test method; GB/T2918-1998 Standard Environment for Condition Conditioning and testing of Plastic samples; measurement of hardness: measured according to the method specified in ASTM D240; determination of elongation at break: measured according to the method specified in ASTM D12; determination of tensile Strength: measured according to the method specified in ASTM D412; determination of 100% tensile Strength: measured according to the method specified in ASTM D412; determination of tear Strength: measured according to the method specified in ASTM D624; ASTM D412 standard test method for tensile strength of thermoplastic elastomers; ASTM D624 standard test method for tear strength of thermoplastic elastomers; GB/T1689 determination of vulcanized rubber wear resistance-with Akron wearing machine; heat resistance GB3512-2001 vulcanized rubber or thermoplastic rubber hot air accelerated aging and heat resistance tests; and (B) method for measuring the combustion performance of the flame-retardant GB/T10707-2008 rubber.
Claims (6)
1. A preparation method for reprocessing rubber and plastic filler by recycling waste resin molding sand is characterized by comprising the following steps:
(1) firstly, after resin molding sand waste is aged for 30-42 h in a xenon lamp at the temperature of-15-10 ℃, starting a ball mill device and grinding and crushing, then adding the ball mill device and a chloroform solvent, triethylamine, coconut oil fatty acid diethanolamide, ethylene glycol, deionized water and an alkali lotion composition into a reaction kettle, carrying out ultrasonic treatment and sealed microwave heating to 30-50 ℃ under the stirring action, carrying out heat preservation for 1-2 h, then cooling to room temperature, starting the ball mill device and grinding and crushing, and sieving by a 200-mesh sieve to obtain a powdery chloroform dispersion; the microwave heating power is 250-300W, the frequency is 40-60 kHz, and the microwave heating equipment comprises the following raw materials in parts by weight: 120-140 parts of resin molding sand waste, 65-83 parts of chloroform solvent, 3.5-4.5 parts of triethylamine, 0.8-1.2 parts of ethylene glycol, 30-50 parts of deionized water and 3-5 parts of alkaline detergent composition to obtain molding sand powder chloroform mixture;
(2) adding 110-135 parts of the molding sand powder chloroform mixture obtained in the step (1) into a reaction kettle, cooling to-5 ℃, adding 112-116 parts of water into the mixture, shaking for layering, removing a chloroform layer, putting the chloroform layer into a Soxhlet extractor for recycling, distilling and recycling chloroform, then leaving a water layer in the reaction kettle, filtering water to obtain a filtered water and molding sand solid mixture for later use, starting a stirring paddle at the bottom of the reaction kettle to uniformly disperse the powder dispersion, stirring for reaction for 1-2 h, then adding 22-33 parts of pickling solution, continuing heating to keep the temperature of the system at 65-75 ℃, intensively stirring for 4-5 h, discharging when the temperature of the materials is reduced to below 30 ℃ after the reaction is finished, then adding filtered water, stirring for 0.5-1 h, then filtering to remove water to obtain solid molding sand, drying and dehydrating at the temperature of 50-60 ℃ and the pressure of 10-15 kPa for 1-3 h, finally obtaining molding sand powder;
(3) adding 100-110 parts of molding sand powder, 10-15 parts of silane coupling agent solution and 0.1-0.2 part of molybdenum sulfide dialkyl dithiocarbamate into a reaction kettle, connecting a corresponding stirring device and a corresponding heating device, slowly heating to 110-115 ℃, adding 1.8-2.5 parts of methacrylate preheated to 110-115 ℃ into a reaction kettle, carrying out heat preservation reaction for 1-2 h, then cooling to 80-85 ℃, adding 0.01-0.1 part of catalyst, carrying out heat preservation reaction for 30min, adding 0.01-0.1 part of chain extender, 0.01-0.2 part of dispersant and 0.01-0.2 part of heat stabilizer, stirring uniformly, discharging, curing for 2-3 h at 120-130 ℃, then sending into a 120-150 ℃ mixing roll, wherein the rotating speed of the mixing roll is 30-80 r/min, the top plug pressure is 1.8-2.3 kg/square centimeter, and the working capacity rate is 50-60%, thus obtaining the recycled waste resin molding sand reprocessed rubber and plastic filler.
2. The method for preparing the recycled waste resin molding sand reprocessed rubber and plastic filler according to claim 1, wherein in the step (1), the xenon lamp and the ozone are aged to 55-60W/m under the irradiance of 340nm2Relative humidity is 40-60%, rainfall period: and (3) drying for 18min in a spraying/102 min mode, wherein the ozone concentration is 50-300 ppm, and the double effects of the xenon lamp and the ozone are achieved.
3. The method for preparing the reclaimed waste resin molding sand reprocessed rubber and plastic filler according to claim 1, wherein the catalyst in the step (3) is one of azobisisobutyrimidazoline hydrochloride and ammonium persulfate; the dispersant in the step (3) is one of monocarbodiimide and coconut oil fatty acid diethanolamide; and the chain extender in the step (3) is one of ethylene diamine sodium hexanesulfonate or polypropylene glycol-diamine-sulfopropyl sodium salt.
4. The method for preparing recycled waste resin molding sand reprocessed rubber and plastic filler according to claim 1, wherein the heat stabilizer in step (3) is one or more of isopropyl palmitate, triphenyl phosphite and calcium ricinoleate.
5. The method for preparing the recycled waste resin molding sand reprocessed rubber and plastic filler according to claim 1, wherein the silane coupling agent solution in the step (3) is a gamma-isocyanatopropyltrimethoxysilane ethanol solution with a mass fraction of 3-5%.
6. The preparation method of the recycled waste resin molding sand reprocessed rubber and plastic filler according to claim 1, wherein the pickling solution in the step (2) is composed of sodium periodate, sulfuric acid and nitric acid according to a weight ratio of 1-2: 2-3: 3-4, the sulfuric acid is a sulfuric acid solution with a mass fraction of 20-25%, the nitric acid is a nitric acid solution with a mass fraction of 15-20%, and the alkali wash composition is composed of sodium hydroxide and sodium carbonate according to a weight ratio of 1: 1.
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| CN201910875618.5A CN110564004B (en) | 2019-09-17 | 2019-09-17 | Preparation method for reprocessing rubber and plastic filler by recycling waste resin molding sand |
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| CN101801561A (en) * | 2007-09-12 | 2010-08-11 | 花王株式会社 | Method for production of regenerated foundry sand |
| CN102000764A (en) * | 2010-12-17 | 2011-04-06 | 重庆长江造型材料（集团）有限公司 | Chemical regeneration method in casting waste sand disposing process |
| CN102807914A (en) * | 2012-08-02 | 2012-12-05 | 江阴浩博科技有限公司 | Environment-friendly mortar recovering process |
| CN106607546A (en) * | 2016-08-31 | 2017-05-03 | 圣固（江苏）机械有限公司 | Coated sand recycling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101801561A (en) * | 2007-09-12 | 2010-08-11 | 花王株式会社 | Method for production of regenerated foundry sand |
| CN102000764A (en) * | 2010-12-17 | 2011-04-06 | 重庆长江造型材料（集团）有限公司 | Chemical regeneration method in casting waste sand disposing process |
| CN102807914A (en) * | 2012-08-02 | 2012-12-05 | 江阴浩博科技有限公司 | Environment-friendly mortar recovering process |
| CN106607546A (en) * | 2016-08-31 | 2017-05-03 | 圣固（江苏）机械有限公司 | Coated sand recycling method |
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