CN116023758B - High-performance amino molding compound for structural part and preparation method thereof - Google Patents
High-performance amino molding compound for structural part and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of molding compound production, in particular to a high-performance amino molding compound for structural parts and a preparation method thereof, and the high-performance amino molding compound comprises the following raw materials in parts by weight: 30-70 parts of amino resin powder, 10-25 parts of inorganic filler, 0.3-1 part of dispersing agent, 0.5-1 part of lubricant, 0.5-1.5 parts of release agent, 0.1-1 part of coupling agent, 0.1-1 part of pigment, 0-1 part of accelerator, 1-3 parts of granulating auxiliary agent and 10-50 parts of glass fiber. The invention adopts a kettle type stirring granulation process technology to prepare the glass fiber reinforced granular amino molding compound, the molding compound is granular, and the glass fibers are wrapped by resin powder and the like at the outer layer. In the preparation process of the amino molding compound granule, amino resin powder and other powder are aggregated into granules by taking glass fiber as a core under the actions of polyvinyl alcohol aqueous solution, ethylene glycol and the like and stirring and back striking. The glass fiber is hardly damaged in the whole process, so that the prepared amino molding compound has high strength, particularly high rotational damage strength and good comprehensive performance.
Description
Technical Field
The invention relates to the technical field of molding compound production, in particular to a high-performance amino molding compound for structural parts and a preparation method thereof.
Background
The amino molding compound is a thermosetting plastic which is formed by copolycondensation of formaldehyde and urea or melamine and then compounding with various auxiliary agents, has the characteristics of good comprehensive performance, low price and the like, and can be widely applied to the aspects of electronic instruments, electrical appliance structural parts, daily necessities and the like. However, the amino molding compound has low strength and large brittleness, and limits the application of the amino molding compound in the field of high-grade electrical appliance materials.
With the rapid development of aircrafts, ships and high-end intelligent equipment in automobile manufacturing, amino molding compounds have limited the application of the amino molding compounds in the fields of high-end electric appliances, automobiles, aircrafts, ships and intelligent equipment spare and accessory parts due to lower strength and high brittleness. At present, UF molding compounds and MF molding compounds in China are all of general-purpose grades, basically have no serialization, and have few high-performance varieties. Development of high-performance products such as flame retardance, high strength, high pressure resistance, impact resistance, cracking resistance and the like is an important direction in the field of amino molding compounds in China, particularly, glass fiber reinforced type and carbon fiber reinforced type products of UF (urea formaldehyde) and MF (melamine) molding compounds are greatly developed, serialization of the products is particularly important, and the prior art adopts a screw extrusion process to mix, disperse and extrude amino resin, filler, auxiliary agent, glass fiber and the like; or grinding glass fiber, adding into amino molding compound powder, and dispersing. In both the above-mentioned processes, physical damages such as shearing are performed on the glass fibers, the lengths of the glass fibers are shortened, and the interfaces of the surfaces treated with the coupling agent and the like are damaged to different degrees, so that the reinforcing effect of the glass fibers is deteriorated.
Disclosure of Invention
The invention aims to provide a high-performance amino molding compound for structural members and a preparation method thereof, which are used for solving the problem that the reinforcing effect of glass fibers is poor in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a high-performance amino molding compound for structural parts comprises the following raw materials in parts by weight: 30-70 parts of amino resin powder, 10-25 parts of inorganic filler, 0.3-1 part of dispersing agent, 0.5-1 part of lubricant, 0.5-1.5 parts of release agent, 0.1-1 part of coupling agent, 0.1-1 part of pigment, 0-1 part of accelerator, 1-3 parts of granulating auxiliary agent and 10-50 parts of glass fiber.
Preferably, the amino resin powder is melamine resin powder, urea resin powder or melamine modified urea resin powder, the water content of the resin powder is less than or equal to 3%, and the water content of the melamine resin powder is preferably less than or equal to 1.5%.
Preferably, the inorganic filler is one or more of calcined kaolin, bentonite, calcium carbonate, mica powder, silica micropowder, aluminum hydroxide, magnesium hydroxide, barium sulfate, montmorillonite powder and calcium sulfate; the mesh number of the inorganic filler is more than or equal to 325 meshes, preferably more than or equal to 800 meshes, and more preferably more than or equal to 1250 meshes; the moisture of the inorganic filler is less than or equal to 3 percent, and the moisture of the inorganic filler is preferably less than or equal to 1.5 percent.
Preferably, the dispersing agent is one or more of sodium hexametaphosphate, sodium pyrophosphate, polyethylene glycol-200 polypropylene glycol-600, alkylphenol polyvinyl ether, butyl stearate and stearic acid amide; preferably one or more of polyethylene glycol-200, polypropylene glycol-600, alkylphenol polyvinyl ethers.
Preferably, the lubricant is one or more of polyethylene glycol-1000, polyethylene glycol 4000, polypropylene glycol-1000, polypropylene glycol-4000, polypropylene glycol-330N, stearic acid complex ester, oleamide and erucamide, PE wax and diethylene glycol dibenzoate; preferably one or more of polyethylene glycol-1000, polyethylene glycol 4000, polypropylene glycol-1000, polypropylene glycol-4000, and polypropylene glycol-330N.
Preferably, the release agent is one or more of zinc stearate, stearic acid, ethylene bis stearamide hard, calcium stearate, dimethyl silicone oil, methyl phenyl silicone oil and emulsified silicone oil.
Preferably, the coupling agent is one or more of a silane coupling agent, a zirconium coupling agent and a titanate coupling agent, preferably a silane coupling agent, and more preferably one or more of an epoxy silane coupling agent, a vinyl silane coupling agent and a melamine silane coupling agent, and even more preferably an epoxy silane coupling agent.
Preferably, the accelerator is one or more of ammonium sulfamate, ammonium chloride, ammonium p-toluenesulfonate, ammonium tartrate and the like, the pigment is one or more of titanium dioxide, iron oxide red, iron oxide yellow, carbon black and chrome green, and the granulating auxiliary is one or more of polyvinyl alcohol aqueous solution, ethylene glycol aqueous solution or polyethylene glycol aqueous solution and the like.
Preferably, the glass fiber is chopped glass fiber yarn, and the diameter of a monofilament is 3-50um, preferably 5-30um, more preferably 5-15um; the glass fiber is chopped into filaments with a length of 1.0-6cm, preferably 1.5-3mm, more preferably 1.5-2mm; the glass fiber is treated by a coupling agent, the coupling agent is one or more of a silane coupling agent, a zirconium coupling agent, a titanate coupling agent and the like, preferably the coupling agent is used, and more preferably the coupling agent contains melamine, vinyl and epoxy silane.
On the other hand, the invention also provides a preparation method of the high-performance amino molding compound for the structural part, which comprises the following steps of:
s10, preparing a granulating auxiliary agent: adding deionized water and polyvinyl alcohol or ethylene glycol and polyethylene glycol into a reaction kettle according to a required proportion, adding the mixture into the reaction kettle until the mixture is completely dissolved, cooling the mixture, and then barreling the mixture for later use;
s20, pretreatment of glass fibers, comprising:
s21: preparing a coupling agent into 10% -50% aqueous solution, wherein the pH value of the coupling agent which needs acid for hydrolysis needs to be adjusted to 3-5;
s22: uniformly spraying the coupling agent and water mixture on the glass fiber surface through a horizontal stirrer for standby;
s30, high-speed dispersion: putting melamine resin powder, inorganic filler, dispersing agent, lubricant, release agent, accelerator, pigment and the like into a high-speed stirrer, stirring and dispersing for 20-40 minutes and uniformly dispersing;
s40, stirring and granulating: putting the glass fiber chopped fibers pretreated in the step S10 and the amino resin mixture dispersed in the step S20 into a kettle type stirring granulation kettle with stirring feathers and lateral back striking feathers, starting the stirring feathers, and stirring for 5-15 minutes at a rotating speed of 50-80R/min; the granulating auxiliary agent is added dropwise, the rotating speed of the stirring feather is increased by 150-200R/min, and the granulating auxiliary agent is added dropwise within 3-6 minutes; after the granulating auxiliary agent is added dropwise, the rotation speed of the stirring feather is increased by 250-400R/min, meanwhile, the back striking feather is started, the rotation speed of the back striking feather is 100-300R/min, particles with larger back striking dispersion are subjected to granulating for 5-10 min in the state, sampling detection is carried out, the qualification rate of the particles reaches more than 80%, the back striking feather is closed, and the rotation speed of the stirring feather is adjusted to 10-30R/min, and then discharging is started;
s50, drying: the material discharging speed is controlled, the granulated material is evenly conveyed into a material tray of a vertical vibration tray type drying lifter, molding material particles continuously move upwards from the bottom material tray under the action of vibration, drying is carried out under the action of hot air, the temperature of the hot air is controlled to be 80-110 ℃, and the water content of the material at an outlet of the vertical vibration tray type drying lifter is controlled to be 2-4% as qualified;
s60, cooling, sieving, crushing and recycling: the dried material is cooled by a conveyer belt and then enters a vibrating screen for screening, the screen is divided into two layers, the mesh number of the upper layer screen is 5-10 meshes, and the mesh number of the lower layer screen is 40-60 meshes; the fine powder passing through the upper screen mesh is not higher than that passing through the lower screen mesh, but the crushed and screened upper screen mesh is qualified, and the fine powder passing through the lower screen mesh is recycled.
Compared with the prior art, the invention has the beneficial effects that: in the high-performance amino molding compound for structural members and the preparation method thereof, a kettle type stirring and granulating process technology is adopted, amino resin powder, filler, dispersing agent, release agent, lubricant, accelerator, pigment and the like are stirred and dispersed well through a high-speed stirrer, then glass fiber chopped filaments are added, granulating auxiliaries such as polyvinyl alcohol aqueous solution, ethylene glycol aqueous solution, polyethylene glycol aqueous solution and the like are dripped in a kettle type stirring and granulating kettle with stirring feathers and lateral impact feathers, and the granular amino molding compound reinforced by glass fibers is prepared through the technological means such as forward stirring at different speeds, lateral impact dispersing, drying, cooling, screening and the like, and the molding compound is granular, and the glass fibers are wrapped by outer resin powder and the like. In the preparation process of the amino molding compound granule, amino resin powder and other powder are aggregated into granules by taking glass fiber as a core under the actions of polyvinyl alcohol aqueous solution, ethylene glycol and the like and stirring and back striking. The glass fiber is hardly damaged in the whole process, so that the prepared amino molding compound has high strength, particularly high rotational damage strength and good comprehensive performance, can meet the requirements of high-end electric appliances, automobiles, aircrafts, ships, intelligent equipment and other parts for manufacturing the high-end amino molding compound, and is particularly suitable for manufacturing parts rotating at high speed.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, however, the invention.
FIG. 1 is a schematic illustration of a preparation flow of the present invention;
FIG. 2 is a schematic diagram of the product of example 1;
FIG. 3 is a schematic representation of the product of comparative example 1.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A high-performance amino molding compound for structural members, as shown in figures 1-3, comprises the following raw materials in parts by weight: 50 parts of amino resin powder, 20 parts of inorganic filler, 0.5 part of dispersing agent, 0.7 part of lubricant, 0.5 part of release agent, 0.5 part of coupling agent, 1.0 part of pigment, 0.3 part of accelerator, 1.5 parts of granulation auxiliary agent and 25 parts of glass fiber.
In this example, the amino resin powder is melamine resin powder, the water content is 1.2%, the inorganic filler is calcined kaolin and bentonite in a ratio of 1:1, a mixture of two or more of the above-mentioned materials; the mesh number of the inorganic filler is 1300 meshes; the water content of the inorganic filler is 1%, the dispersing agent is polyethylene glycol-200 and polypropylene glycol-600 in a ratio of 1:1, wherein the lubricant is a mixture of polyethylene glycol-1000 and polyethylene glycol 4000, the release agent is zinc stearate, the coupling agent is epoxy silane coupling agent KH-560, the accelerator is ammonium sulfamate, the pigment is titanium dioxide, the granulating auxiliary agent is polyvinyl alcohol-1788 fine powder, the glass fiber is chopped glass fiber, the diameter of a monofilament is 10um, and the length is 1.5mm; the glass fiber is treated by a coupling agent, and the coupling agent is a silane coupling agent containing amino, vinyl and epoxy groups.
The coupling agent is a silane coupling agent containing melamine, vinyl and epoxy groups.
On the other hand, the invention also provides a preparation method of the high-performance amino molding compound for the structural part, which comprises the following steps of:
s10, preparing a granulating auxiliary agent: adding deionized water and polyvinyl alcohol-1788 into a reaction kettle according to a required proportion, adding into the kettle to dissolve completely, preparing into 12% aqueous solution, cooling to 40 ℃, and barreling for later use;
s20, pretreatment of glass fibers, comprising:
s21: preparing a coupling agent into a 30% aqueous solution, adding formic acid to adjust the pH value to 4.5, and hydrolyzing;
s22: uniformly spraying the coupling agent and water mixture on the glass fiber surface through a horizontal stirrer for standby;
s30, high-speed dispersion: putting melamine resin powder, inorganic filler, dispersing agent, lubricant, release agent, accelerator, pigment and the like into a high-speed stirrer, stirring and dispersing for 40 minutes and uniformly dispersing;
s40, stirring and granulating: putting the glass fiber chopped fibers pretreated in the step S10 and the amino resin mixture dispersed in the step S20 into a kettle type stirring granulation kettle with stirring feathers and lateral back striking feathers, starting the stirring feathers, and stirring for 5 minutes at a rotating speed of 80R/min; the granulating auxiliary agent is dripped, the rotating speed of the stirring feather is increased by 150R/min, and the granulating auxiliary agent is dripped within 3 minutes; after the granulating auxiliary agent is added dropwise, the rotation speed of the stirring feather is increased by 400R/min, meanwhile, the back striking feather is started, the rotation speed of the back striking feather is 300R/min, particles with larger back striking dispersion are granulated for 10 minutes in the state, sampling detection is carried out, the particle qualification rate reaches more than 80%, the back striking feather is closed, and the rotation speed of the stirring feather is adjusted to 30R/min, and then discharging is started;
s50, drying: the material discharging speed is controlled, the granulated material is uniformly conveyed into a material tray of a vertical vibration tray type drying lifter, molding material particles continuously move upwards from the bottom material tray under the action of vibration, drying is carried out under the action of hot air, the temperature of the hot air is controlled to be 110 ℃, and the water content of the material at the outlet of the vertical vibration tray type drying lifter is controlled to be 3 percent to be qualified;
s60, cooling, sieving, crushing and recycling: the dried material is cooled by a conveyer belt and then enters a vibrating screen for screening, the screen is divided into two layers, the mesh number of the upper layer screen is 10 meshes, and the mesh number of the lower layer screen is 60 meshes; the fine powder passing through the upper screen mesh is not higher than that passing through the lower screen mesh, but the crushed and screened upper screen mesh is qualified, and the fine powder passing through the lower screen mesh is recycled.
The technical indexes of the superior product are as follows: tensile stress at break (σB), 80.58MPa; flexural strength (σfm), 135.47MPa; impact strength (acu) of simple beam 13.28KJ/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Notched impact strength (acA) of simply supported beams, 4.13KJ/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The load denaturation temperature Tff 1.8, 206 ℃; the rotational failure strength (180 ℃) was 45000rpm.
Example 2
A high-performance amino molding compound for structural members, as shown in figures 1-3, comprises the following raw materials in parts by weight: 48 parts of amino resin powder, 15 parts of inorganic filler, 0.6 part of dispersing agent, 0.6 part of lubricant, 0.8 part of release agent, 0.5 part of coupling agent, 1 part of pigment, 0.5 part of accelerator, 3 parts of granulation auxiliary agent and 30 parts of glass fiber.
The amino resin powder is urea resin powder, the water content is 1%, the inorganic filler is calcined kaolin and bentonite in a ratio of 1:1, a mixture of two or more of the above-mentioned materials; the mesh number of the inorganic filler is 1400 meshes; the water content of the inorganic filler is 1.5%, the dispersing agent is sodium hexametaphosphate and sodium pyrophosphate, and the ratio of the dispersing agent to sodium pyrophosphate is 1:1, wherein the lubricant is polypropylene glycol-1000, polypropylene glycol-4000, the release agent is ethylene bis stearamide hard, zinc stearate, the coupling agent is epoxy silane coupling agent KH-560, the accelerator is ammonium sulfamate, the pigment is titanium dioxide, the granulating auxiliary agent is polyethylene glycol-1000 water solution, the glass fiber is glass fiber chopped filaments, the diameter of the filaments is 12um, and the length is 2mm; the glass fiber is treated by a coupling agent, and the coupling agent is a silane coupling agent containing amino, vinyl and epoxy groups.
On the other hand, the invention also provides a preparation method of the high-performance amino molding compound for the structural part, which comprises the following steps of:
s10, preparing a granulating auxiliary agent: adding deionized water and polyethylene glycol-1000 into a reaction kettle according to a required proportion, adding the mixture into the reaction kettle to be completely dissolved, preparing 50% aqueous solution, cooling to 40 ℃ and then barreling for later use;
s20, pretreatment of glass fibers, comprising:
s21: preparing a coupling agent into a 30% aqueous solution, adding formic acid to adjust the pH value to 4.5, and hydrolyzing;
s22: uniformly spraying the coupling agent and water mixture on the glass fiber surface through a horizontal stirrer for standby;
s30, high-speed dispersion: putting melamine resin powder, inorganic filler, dispersing agent, lubricant, release agent, accelerator, pigment and the like into a high-speed stirrer, stirring and dispersing for 30 minutes, and uniformly dispersing;
s40, stirring and granulating: putting the glass fiber chopped fibers pretreated in the step S10 and the amino resin mixture dispersed in the step S20 into a kettle type stirring granulation kettle with stirring feathers and lateral back striking feathers, starting the stirring feathers, and stirring at a rotating speed of 60R/min for 5-15 minutes; the granulating auxiliary agent is dripped, the rotating speed of the stirring feather is increased by 180R/min, and the granulating auxiliary agent is dripped within 5 minutes; after the granulating auxiliary agent is added dropwise, the rotating speed of the stirring feather is increased by 300R/min, meanwhile, the back striking feather is started, the rotating speed of the back striking feather is 230R/min, particles with larger back striking dispersion are subjected to granulating for 8 minutes in the state, sampling detection is carried out, the particle qualification rate reaches more than 80%, the back striking feather is closed, the rotating speed of the stirring feather is adjusted to 20R/min, and discharging is started;
s50, drying: the material discharging speed is controlled, the granulated material is uniformly conveyed into a material tray of a vertical vibration tray type drying lifter, molding material particles continuously move upwards from the bottom material tray under the action of vibration, drying is carried out under the action of hot air, the temperature of the hot air is controlled to be 100 ℃, and the water content of the material at the outlet of the vertical vibration tray type drying lifter is controlled to be 3 percent to be qualified;
s60, cooling, sieving, crushing and recycling: the dried material is cooled by a conveyer belt and then enters a vibrating screen for screening, the screen is divided into two layers, the mesh number of the upper layer screen is 8 meshes, and the mesh number of the lower layer screen is 50 meshes; the fine powder passing through the upper screen mesh is not higher than that passing through the lower screen mesh, but the crushed and screened upper screen mesh is qualified, and the fine powder passing through the lower screen mesh is recycled.
The technical indexes of the products of the superior products are as follows: tensile stress at break (σB), 78.43MPa; flexural strength (σfm), 128.97MPa; impact strength (acu) of simple beam 12.58KJ/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Notched impact strength (acA) of simply supported beams, 3.86KJ/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The load denaturation temperature Tff 1.8, 186 ℃; the rotational breaking strength (150 ℃ C.) was 38000rpm.
Comparative example 1
The formulation of comparative example 1 was the same as that of example 1, and the preparation process was as follows:
(1) Preparing a coupling agent into a 30% aqueous solution, adding formic acid to adjust the pH value to 4.5, and hydrolyzing for later use;
(2) Putting melamine resin powder, inorganic filler, dispersing agent, lubricant, release agent, accelerator, pigment and the like into a high-speed stirrer, stirring and dispersing for 40 minutes and uniformly dispersing;
(3) Uniformly spraying the coupling agent and water mixture on the glass fiber surface by a horizontal stirrer, and then adding the powder material dispersed in the step (2);
(4) The rotating speed of the horizontal blade stirrer is adjusted to 45r/min, and the glass fiber chopped filaments are slowly stirred and mixed for 30min, so that the glass fiber chopped filaments are uniformly dispersed in the powder material.
(4) Starting a screw conveyor, adjusting the rotating speed of the screw conveyor to 20r/min, adjusting the rotating speed of the horizontal paddle stirrer to 10 r/min, opening a blanking valve of the horizontal paddle stirrer, and conveying the mixed materials into a hopper of a metering screw by using the screw conveyor.
(5) When the material of the metering screw hopper reaches 2/3, starting the double-screw mixing extruder, and starting the oil pump, the main machine screw, the lateral feeder screw and the metering screw in sequence. Before starting the host screw, the host screw needs to be preheated for at least 1h in advance, and the temperature of three areas is set: the first region is 50-60deg.C, the second region is 70-80deg.C, and the third region is 90-100deg.C.
(6) And (3) slowly adjusting the rotation speeds of the main machine screw and the metering screw to 150r/min and 15r/min, and starting conveying and granulating equipment such as a tablet press, a belt conveyor, an air cooler, a crushing granulator, a vibrating screen and the like after the materials are extruded and agglomerated from the double-screw mixing extruder.
7) Starting a cooling water circulating pump, wherein the first area is cooled by normal-temperature water, the temperature of the cooling water is lower than 35 ℃, the second area and the third area are cooled by chilled water, and the water temperature is lower than 10 ℃; the water pressure should be not lower than 0.8MPa, and the water quantity is intelligently controlled by an electromagnetic valve.
(8) Observing the temperature of the materials in the third area of the main machine screw, wherein the temperature of the materials in the first area is controlled to be 60-70 ℃, the temperature of the materials in the second area is controlled to be 80-90 ℃, and the temperature of the materials in the third area is controlled to be 105-115 ℃; and after the temperature of the materials in the three areas is stable, the rotating speeds of the main machine screw and the metering screw are slowly adjusted to 300r/min and 30r/min, and the production is carried out according to the process.
The melamine molding compound has the following performance indexes: tensile stress at break (σB), 70.49MPa; flexural strength (σfm), 123.62MPa; impact strength (acu) of simple beam 10.28KJ/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Notched impact strength (acA) of simply supported beams, 3.42KJ/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The load denaturation temperature Tff 1.8, 198 ℃; the rotational breaking strength (180 ℃) was 30000rpm.
By way of comparative example, example 1 was consistent with the formulation of comparative example 1, but the product of example 1 was higher in strength, load-carrying denaturation temperature and rotational failure strength than that of comparative example 1, and the molding compound of example 1 was more uniform in particles and less in fines than comparative example 1.
It is noted that the amino resin powder in the invention is from self-made or commercial sources, the inorganic filler, the dispersing agent, the lubricant, the release agent, the coupling agent, the accelerator, the pigment and the glass fiber are all from commercial sources, and the granulation auxiliary agent is prepared.
The high-performance amino molding compound for the structural part and the preparation method thereof have the following advantages: the preparation method comprises the steps of adopting a kettle type stirring granulation process technology, firstly stirring and dispersing amino resin powder, filler, dispersing agent, release agent, lubricant, accelerator, pigment and the like through a high-speed stirrer, then adding glass fiber short-cut filaments, dripping granulation auxiliaries such as polyvinyl alcohol aqueous solution, ethylene glycol aqueous solution, polyethylene glycol aqueous solution and the like into a kettle type stirring granulation kettle with stirring feather and lateral impact feather, and preparing glass fiber reinforced granular amino molding compound through the process means such as forward stirring at different rates, lateral impact dispersion, drying, cooling, screening and the like, wherein the molding compound is granular, and glass fibers are wrapped by outer resin powder and the like. In the preparation process of the amino molding compound granule, amino resin powder and other powder are aggregated into granules by taking glass fiber as a core under the actions of polyvinyl alcohol aqueous solution, ethylene glycol and the like and stirring and back striking. The glass fiber is hardly damaged in the whole process, so that the prepared amino molding compound has high strength, particularly high rotational damage strength and good comprehensive performance, can meet the requirements of high-end electric appliances, automobiles, aircrafts, ships, intelligent equipment and other parts for manufacturing the high-end amino molding compound, and is particularly suitable for manufacturing parts rotating at high speed.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A high-performance amino molding compound for structural parts is characterized in that: the material comprises the following raw materials in parts by weight: 30-70 parts of amino resin powder, 10-25 parts of inorganic filler, 0.3-1 part of dispersing agent, 0.5-1 part of lubricant, 0.5-1.5 parts of release agent, 0.1-1 part of coupling agent, 0.1-1 part of pigment, 0-1 part of accelerator, 1-3 parts of granulating auxiliary agent and 10-50 parts of glass fiber; the amino resin powder is melamine resin powder, urea resin powder or melamine modified urea resin powder, and the water content of the amino resin powder is less than or equal to 3%; the granulating auxiliary agent is one or more of polyvinyl alcohol aqueous solution, ethylene glycol aqueous solution or polyethylene glycol aqueous solution;
the preparation method of the high-performance amino molding compound for the structural part specifically comprises the following steps:
s10: preparing a granulating auxiliary agent: adding deionized water and polyvinyl alcohol or ethylene glycol or polyethylene glycol into a reaction kettle according to a required proportion, adding the mixture into the reaction kettle until the mixture is completely dissolved, cooling the mixture, and then barreling the mixture for later use;
s20: glass fiber pretreatment, comprising:
s21: preparing a coupling agent into 10% -50% aqueous solution, wherein the pH value of the coupling agent which needs acid for hydrolysis needs to be adjusted to 3-5;
s22: uniformly spraying a coupling agent and water mixture on the surface of the glass fiber by a horizontal stirrer for later use;
s30: high-speed dispersion: adding amino resin powder, inorganic filler, dispersing agent, lubricant, release agent, accelerator and pigment into a high-speed stirrer, stirring and dispersing for 20-40 min to uniformly disperse;
s40: stirring and granulating: putting the glass fiber chopped fibers pretreated in the step S10 and the amino resin mixture dispersed in the step S20 into a kettle type stirring granulation kettle with stirring feathers and lateral back striking feathers, starting the stirring feathers, and stirring for 5-15 minutes at a rotating speed of 50-80R/min; the granulating auxiliary agent is added dropwise, the rotating speed of the stirring feather is increased by 150-200R/min, and the granulating auxiliary agent is added dropwise within 3-6 minutes; after the granulating auxiliary agent is added dropwise, the rotation speed of the stirring feather is increased by 250-400R/min, meanwhile, the back striking feather is started, the rotation speed of the back striking feather is 100-300R/min, particles with larger back striking dispersion are subjected to granulating for 5-10 min in the state, sampling detection is carried out, the qualification rate of the particles reaches more than 80%, the back striking feather is closed, and the rotation speed of the stirring feather is adjusted to 10-30R/min, and then discharging is started;
s50: and (3) drying: the material discharging speed is controlled, the granulated material is evenly conveyed into a material tray of a vertical vibration tray type drying lifter, molding material particles continuously move upwards from the bottom material tray under the action of vibration, drying is carried out under the action of hot air, the temperature of the hot air is controlled to be 80-110 ℃, and the water content of the material at an outlet of the vertical vibration tray type drying lifter is controlled to be 2-4% as qualified;
s60: cooling, sieving, crushing and recovering: the dried material is cooled by a conveyer belt and then enters a vibrating screen for screening, the screen is divided into two layers, the mesh number of the upper layer screen is 5-10 meshes, and the mesh number of the lower layer screen is 40-60 meshes; the fine powder passing through the upper screen mesh is not higher than that passing through the lower screen mesh, but the crushed and screened upper screen mesh is qualified, and the fine powder passing through the lower screen mesh is recycled.
2. The high-performance amino molding compound for structural members according to claim 1, wherein: the inorganic filler is one or more of calcined kaolin, bentonite, calcium carbonate, mica powder, silica micropowder, aluminum hydroxide, magnesium hydroxide, barium sulfate, montmorillonite powder and calcium sulfate; the mesh number of the inorganic filler is more than or equal to 325 meshes; the moisture of the inorganic filler is less than or equal to 3 percent.
3. The high-performance amino molding compound for structural members according to claim 1, wherein: the dispersing agent is one or more of sodium hexametaphosphate, sodium pyrophosphate, polyethylene glycol-200, polypropylene glycol-600, alkylphenol polyvinyl ether, butyl stearate and stearic acid amide.
4. The high-performance amino molding compound for structural members according to claim 1, wherein: the lubricant is one or more of polyethylene glycol-1000, polyethylene glycol 4000, polypropylene glycol-1000, polypropylene glycol-4000, polypropylene glycol-330N, stearic acid complex ester, oleamide and erucamide, PE wax and diethylene glycol dibenzoate.
5. The high-performance amino molding compound for structural members according to claim 1, wherein: the release agent is one or more of zinc stearate, stearic acid, ethylene bis stearamide, calcium stearate, dimethyl silicone oil, methyl phenyl silicone oil and emulsified silicone oil.
6. The high-performance amino molding compound for structural members according to claim 1, wherein: the coupling agent is one or more of silane coupling agent, zirconium coupling agent and titanate coupling agent.
7. The high-performance amino molding compound for structural members according to claim 1, wherein: the promoter is one or more of ammonium sulfamate, ammonium chloride, ammonium p-toluenesulfonate and ammonium tartrate, and the pigment is one or more of titanium white, iron oxide red, iron oxide yellow, carbon black and chrome green.
8. The high-performance amino molding compound for structural members according to claim 1, wherein: the glass fiber is chopped glass fiber, and the diameter of a monofilament is 3-50um; the selected glass fiber is chopped into threads with the length of 1.0-6cm; the glass fiber is treated by a coupling agent, and the coupling agent is one or more of a silane coupling agent, a zirconium coupling agent and a titanate coupling agent.
9. A method for preparing a high-performance amino molding compound for structural parts, comprising the high-performance amino molding compound for structural parts according to any one of claims 1 to 8, which is characterized in that: the method specifically comprises the following steps:
s10: preparing a granulating auxiliary agent: adding deionized water and polyvinyl alcohol or ethylene glycol or polyethylene glycol into a reaction kettle according to a required proportion, adding the mixture into the reaction kettle until the mixture is completely dissolved, cooling the mixture, and then barreling the mixture for later use;
s20: glass fiber pretreatment, comprising:
s21: preparing a coupling agent into 10% -50% aqueous solution, wherein the pH value of the coupling agent which needs acid for hydrolysis needs to be adjusted to 3-5;
s22: uniformly spraying a coupling agent and water mixture on the surface of the glass fiber by a horizontal stirrer for later use;
s30: high-speed dispersion: adding amino resin powder, inorganic filler, dispersing agent, lubricant, release agent, accelerator and pigment into a high-speed stirrer, stirring and dispersing for 20-40 min to uniformly disperse;
s40: stirring and granulating: putting the glass fiber chopped fibers pretreated in the step S10 and the amino resin mixture dispersed in the step S20 into a kettle type stirring granulation kettle with stirring feathers and lateral back striking feathers, starting the stirring feathers, and stirring for 5-15 minutes at a rotating speed of 50-80R/min; the granulating auxiliary agent is added dropwise, the rotating speed of the stirring feather is increased by 150-200R/min, and the granulating auxiliary agent is added dropwise within 3-6 minutes; after the granulating auxiliary agent is added dropwise, the rotation speed of the stirring feather is increased by 250-400R/min, meanwhile, the back striking feather is started, the rotation speed of the back striking feather is 100-300R/min, particles with larger back striking dispersion are subjected to granulating for 5-10 min in the state, sampling detection is carried out, the qualification rate of the particles reaches more than 80%, the back striking feather is closed, and the rotation speed of the stirring feather is adjusted to 10-30R/min, and then discharging is started;
s50: and (3) drying: the material discharging speed is controlled, the granulated material is evenly conveyed into a material tray of a vertical vibration tray type drying lifter, molding material particles continuously move upwards from the bottom material tray under the action of vibration, drying is carried out under the action of hot air, the temperature of the hot air is controlled to be 80-110 ℃, and the water content of the material at an outlet of the vertical vibration tray type drying lifter is controlled to be 2-4% as qualified;
s60: cooling, sieving, crushing and recovering: the dried material is cooled by a conveyer belt and then enters a vibrating screen for screening, the screen is divided into two layers, the mesh number of the upper layer screen is 5-10 meshes, and the mesh number of the lower layer screen is 40-60 meshes; the fine powder passing through the upper screen mesh is not higher than that passing through the lower screen mesh, but the crushed and screened upper screen mesh is qualified, and the fine powder passing through the lower screen mesh is recycled.
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|---|---|---|---|---|
| JP2015120848A (en) * | 2013-12-24 | 2015-07-02 | 旭有機材工業株式会社 | Phenol resin molding material and method for producing the same |
| CN111499892A (en) * | 2020-06-04 | 2020-08-07 | 开化瑞达塑胶科技有限公司 | Preparation method of glass fiber reinforced high-strength heat-resistant amino molding compound |
| CN111534044A (en) * | 2020-06-04 | 2020-08-14 | 开化瑞达塑胶科技有限公司 | High-strength heat-resistant melamine molding compound and preparation method thereof |
| CN114379052A (en) * | 2021-12-23 | 2022-04-22 | 开化瑞达塑胶科技有限公司 | Preparation of glass fiber modified amino molding compound by dry one-step method |
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Patent Citations (4)
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|---|---|---|---|---|
| JP2015120848A (en) * | 2013-12-24 | 2015-07-02 | 旭有機材工業株式会社 | Phenol resin molding material and method for producing the same |
| CN111499892A (en) * | 2020-06-04 | 2020-08-07 | 开化瑞达塑胶科技有限公司 | Preparation method of glass fiber reinforced high-strength heat-resistant amino molding compound |
| CN111534044A (en) * | 2020-06-04 | 2020-08-14 | 开化瑞达塑胶科技有限公司 | High-strength heat-resistant melamine molding compound and preparation method thereof |
| CN114379052A (en) * | 2021-12-23 | 2022-04-22 | 开化瑞达塑胶科技有限公司 | Preparation of glass fiber modified amino molding compound by dry one-step method |
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