CN112341842B - Production method of floating type aluminum paste for chrome plating effect aerosol paint - Google Patents

Production method of floating type aluminum paste for chrome plating effect aerosol paint Download PDF

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CN112341842B
CN112341842B CN202011037673.6A CN202011037673A CN112341842B CN 112341842 B CN112341842 B CN 112341842B CN 202011037673 A CN202011037673 A CN 202011037673A CN 112341842 B CN112341842 B CN 112341842B
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ball mill
stearic acid
ball
aluminum
aluminum paste
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CN112341842A (en
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石龙
赵守元
黄小尾
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Zuxing New Material Co ltd
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Zuxing New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/40—Compounds of aluminium
    • C09C1/407—Aluminium oxides or hydroxides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/62—Metallic pigments or fillers
    • C09C1/64—Aluminium
    • C09C1/644—Aluminium treated with organic compounds, e.g. polymers
    • C09C1/646—Aluminium treated with organic compounds, e.g. polymers concomitant with mechanical comminution, shaping or abrasion of the particles
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/041—Grinding
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/004—Reflecting paints; Signal paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres

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  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
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Abstract

The invention discloses a production method of floating type aluminum paste for chrome plating effect aerosol paint, which comprises the following steps: (1) pre-dispersing stearic acid; (2) feeding; (3) a first ball milling stage: adjusting the rotating speed of the ball mill, and performing first ball milling; (4) ball milling in a second stage: adding solvent oil into the ball mill, adjusting the rotating speed of the ball mill, and performing secondary ball milling; (5) a third ball milling stage: adding stearic acid modified nano alumina into the ball mill, adjusting the rotating speed of the ball mill, and carrying out ball milling for the third time; (6) discharging the aluminum paste in the ball mill, screening, then carrying out filter pressing, kneading, barreling and standing to prepare the floating aluminum paste for the chrome plating effect aerosol paint. According to the invention, stearic acid modified nano-alumina is introduced, on one hand, the stearic acid modified nano-alumina can prevent water from permeating into the surface of an aluminum sheet, and the storage stability of the aerosol paint is prolonged; on the other hand, a large amount of stearic acid is adsorbed on the surface of the nano aluminum oxide, so that the floating capacity of the aluminum sheet can be further improved.

Description

Production method of floating type aluminum paste for chrome plating effect aerosol paint
Technical Field
The invention relates to a production method of floating type aluminum paste, in particular to a production method of floating type aluminum paste for chrome plating effect aerosol paint. In addition, the invention also relates to the floating type aluminum paste for the chrome plating effect aerosol paint produced by the production method.
Background
Aerosol paint, i.e. self-spraying paint, is paint which is processed by a special method and then filled under high pressure to facilitate spraying, is also called manual spraying paint and generally comprises an aerosol can, an aerosol valve, paint and a propellant, and is also provided with a stirring ball (marble) which is arranged in the aerosol can to play a role in assisting stirring. The aerosol paint has wide application, and through the economic development in recent years, the application is developed from the initial repair of paint flaws to various industries such as molds, industrial machinery, toys, artware, musical instruments, buildings, steel structures, advertising industry propaganda industry, identification, doodling and the like.
The chrome plating effect aerosol paint has mirror silver luster similar to chrome plating, can be used for repairing stainless steel, chrome plating and hot galvanizing, and can be independently used for decoration and artware manufacturing; has certain corrosion resistance, and can be independently used for metal corrosion prevention.
The floating aluminum paste for the chromium plating effect aerosol paint needs to meet the requirements that D50 is about 3-5 mu m, the surface of an aluminum sheet is smooth and flat, the floating value is high and the like, and the existing floating aluminum paste cannot completely meet the requirements, so that after the aerosol paint is prepared, the mirror surface effect is not good enough, and particularly, the mirror surface effect of the floating aluminum paste produced in winter when the temperature is low is extremely poor. After being prepared into aerosol paint, the aerosol paint needs to be stored for two years at normal temperature or 20 days at 50 ℃; the existing automatic chrome-plating spray paint made of floating aluminum paste can be changed after being stored for one month at normal temperature or being stored for 7 days at constant temperature of 50 ℃, cracks can appear on slight points, and spraying can not float on serious points, so that a paint film is dark and black, the effect of a metal mirror surface is completely avoided, and even the phenomena of no spraying and the like caused by the phenomenon that the aluminum paste is coarsened, a nozzle is blocked and the aluminum paste cannot be sprayed can occur.
The conventional method for producing the floating type aluminum paste of the chrome plating effect aerosol paint in the prior art comprises the following steps: adding spherical aluminum powder, a petroleum solvent, a ball-milling assistant and the like into a ball mill according to a certain proportion, and preparing the floating aluminum paste after screening, solid-liquid separation and homogenization after ball-milling forming.
CN103613960B discloses a preparation method of floating type aluminum paste, which adopts the process flows of ball milling, screening, filter pressing, ball milling again, screening again and filter pressing again, but the actual operation process is more complicated; the floating value of the produced floating type aluminum paste is not enough, and particularly the floating type aluminum paste produced in winter causes the mirror surface effect sprayed by the aerosol paint to be poor; the produced floating aluminum paste is not enough in storage stability after being prepared into aerosol paint, and a paint film becomes dark and black after being stored for 7 days at 50 ℃, so that the paint film has no metal mirror surface effect completely. CN101948639B discloses a method for manufacturing high-floating-value floating type aluminum paste, wherein after the produced floating type aluminum paste is made into aerosol paint, the mirror effect can meet the requirement, but the floating type aluminum paste produced in winter still has insufficient mirror effect; after the produced floating aluminum paste is prepared into aerosol paint, slight cracks are occasionally sprayed after the aerosol paint is stored for 7 days at 50 ℃, and the phenomenon of spraying non-floating is still generated after 20 days.
Disclosure of Invention
The invention provides a production method of floating type aluminum paste for chrome plating effect aerosol paint, and aims to solve the technical problems that floating type aluminum paste in the prior art is low in floating value and the mirror surface effect is not good enough after the aerosol paint is prepared.
According to one aspect of the invention, the invention provides a production method of floating type aluminum paste for chrome plating effect aerosol paint, which aims to solve the technical problem that the storage period of the floating type aluminum paste in the prior art is not long enough.
The invention solves the technical problem by adopting the technical scheme that the production method of the floating type aluminum paste for the chrome plating effect aerosol paint comprises the following steps:
(1) pre-dispersing stearic acid:
mixing stearic acid: 1: 1.2-1.5, then heating the mixture to 50 +/-5 ℃, and continuously stirring until the stearic acid is completely dissolved in the solvent oil to obtain the pre-dispersed stearic acid.
Furthermore, in each step, the solvent oil can be at least one of aromatic hydrocarbon solvent and alkane solvent. However, in view of the control and safety of aromatic hydrocarbon substances, D50 mineral spirits or D80 mineral spirits are preferable.
The D50 solvent oil or D80 solvent oil belongs to alkane solvents, and the alkane solvents do not contain polycyclic aromatic hydrocarbons (with the increasing requirement of environmental protection, the content of polycyclic aromatic hydrocarbons in products is strictly limited in many countries and regions) compared with aromatic solvents.
(2) Feeding:
taking solvent oil, and mixing the solvent oil, the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) in a ball mill according to the following parts by mass: spherical aluminum powder: 120-160 parts by mass of pre-dispersed stearic acid: 100 parts by mass: 8-16 parts by mass.
Further, in the step (2), the requirements of the ball mill are as follows: firstly, the rotating speed of the ball mill can be changed, and the purpose is achieved by changing the frequency of a motor; secondly, the temperature in the ball mill can be kept at 50 +/-5 ℃ in the whole ball milling process. Preferably, a variable-frequency horizontal ball mill is adopted, the total number of the horizontal ball mill is two layers, and the method is equivalent to the method that a stainless steel jacket is coated outside a roller of the original ball mill. In the whole ball milling process, balls and ball milling materials are arranged in the roller, and water with different temperatures is arranged between the roller and the jacket to ensure that the temperature in the ball mill is 50 +/-5 ℃.
When the temperature is lower, the product is kept at a certain temperature in the ball milling stage by heating measures, and the method can solve the problem that the floating value of the floating type aluminum paste produced in a low-temperature environment is not enough.
Further, in the step (2), the spherical aluminum powder D50 is less than or equal to 3 μm, and D50 is more preferably 1-3 μm. Research shows that the smaller the spherical aluminum powder D50 is, the better the mirror effect of the obtained floating aluminum paste for the aerosol paint with chromium plating effect is, but the smaller the spherical aluminum powder D50 is, the higher the price is, and the existing situation is difficult to produce in large scale, so the D50 is selected to be the most optimal value of 1-3 μm in comprehensive cost factors.
Further, in the step (2), the diameter of the balls in the ball mill is less than 2mm, and more preferably 1 mm. Stainless steel balls or zirconia balls are preferred.
The material of the ball mill of the present invention may be stainless steel balls or zirconia balls, but zirconia balls are expensive, and stainless steel balls are more preferable from the viewpoint of price. The invention is preferably such that the diameter of the ball is 1mm, although a slightly larger ball may be chosen, but preferably it does not exceed 2 mm. Since the larger the size of the spheres, the time required for storage is shortened and the hue becomes darker after the spray coating. It is best to choose a stainless steel ball that is a little smaller, but the smaller the ball, the higher the cost, so the best choice is a ball that is 1mm large.
In the ball milling process, the steel balls mainly have two states, one state is that the steel balls and the inner walls are mutually rubbed, and in the state, because aluminum has certain ductility, the spherical aluminum powder is continuously milled into sheets like dumpling wrappers by the shearing force of the steel balls. The other is that the steel ball is lifted to a certain height along with the rotation of the ball mill and then smashed, and in this state, the aluminum sheet can be smashed after reaching a certain size.
(3) A first ball milling stage: adjusting the rotating speed of the ball mill to be 30-40 r/min, and ball-milling for 20-30 hours.
The main purpose of the stage is to grind the spherical aluminum powder into aluminum sheets with D50 of 3-5 μm.
The first stage of ball milling is to flake spherical aluminum powder and flake spherical aluminum powder with particle size D50 of 3-5 μm. If the rotating speed of the ball mill is too high, the centrifugal force of the steel ball is too large, and after a certain degree, the steel ball always rotates along with the ball mill, so that the smashing effect cannot be achieved. If the rotating speed of the ball mill is too low, the steel ball cannot be lifted to a certain height, and the smashing effect cannot be achieved. The ball milling time is determined by the factor that D50 is 3-5 mu m; the cost is increased by a certain amount if the time is too long, and the particle size of the aluminum sheet is not reduced by a certain amount; if the time is too short, the particle size is not achieved.
(4) Ball milling in a second stage: adding 30-50 parts by mass of solvent oil into a ball mill, adjusting the rotating speed of the ball mill to 15-20r/min, and carrying out ball milling for 8-12 hours.
The purpose of the stage is mainly to polish the surface of the aluminum sheet, so that the surface of the aluminum sheet becomes smooth and flat, and the thickness of the aluminum sheet is further reduced, thereby improving the mirror surface effect of the aerosol paint.
And in the second stage of ball milling, the solvent oil is added to reduce the shearing force of the steel balls to the aluminum sheets, and the aim of reducing the rotating speed is also fulfilled, so that the steel balls have a better polishing effect on the surfaces of the aluminum sheets. The time is judged according to the mirror surface effect of the aerosol paint made by the later-stage product, and is too short, the mirror surface effect is slightly poor, and is too long, so that the mirror surface effect is not greatly improved.
(5) A third ball milling stage: adding stearic acid modified nano alumina into a ball mill, adjusting the rotating speed of the ball mill to be 8-12r/min, and carrying out ball milling for 1-3 hours.
Further, in the step (5), the weight ratio of the stearic acid modified nano alumina to the spherical aluminum powder raw material in the step (2) is 0.5-2: 100.
further, in the step (5), the preparation method of stearic acid modified nano alumina is as follows: a process for modifying nano-class alumina with stearic acid, Yangylin, etc. includes volume 40, pages 1, 8-12 and 3 months 2018.
The surface treatment is mainly carried out on the formed aluminum sheet in the stage, so that the nano aluminum oxide is adsorbed to the surface of the aluminum sheet, and the stearic acid modified nano aluminum oxide is introduced, so that the floating value of the floating aluminum paste is improved, and the storage stability of the aerosol paint is ensured. On one hand, a large amount of stearic acid is adsorbed on the surface of the nano aluminum oxide, so that the floating capacity of the aluminum sheet can be further improved; on the other hand, the nano-alumina can prevent water from permeating into the surface of the aluminum sheet, and the storage stability of the aerosol paint is prolonged.
The third stage of ball-milling, too high rotational speed can produce great shearing force for the nanometer aluminium oxide that adsorbs at the aluminum sheet surface drops, and the even distribution of nanometer aluminium oxide that adds can not be guaranteed again to the system in the middle of the rotational speed that crosses lowly, can make partial aluminum sheet can't adsorb on the nanometer aluminium oxide. The short time can not ensure that all the nano-alumina is adsorbed on the surface of the aluminum sheet, and the long time is unnecessary.
The steel ball can press the nano aluminum oxide into the stearic acid coated outside the aluminum sheet. If unmodified ordinary alumina is used, its dispersibility in a solvent is poor and the corresponding effect is not achieved.
The usage amount of the stearic acid modified alumina is determined by floating value and the effect of preparing into aerosol paint after products are made according to different usage amounts, the usage amount is too small, the effect is not obvious, the usage amount is too much, one can increase the cost, the other can be difficult to filter-press in the filter-pressing process, and the filter cake is also difficult to blow dry.
In the whole ball milling process, D50 is continuously increased along with the increase of the ball milling time, the ball milling is continued after the ball milling time is increased to a certain value, D50 is gradually reduced, and the ball milling time is increased, so that D50 is basically unchanged.
(6) Discharging the aluminum paste in the ball mill, screening, then carrying out filter pressing, kneading, barreling and standing to prepare the floating aluminum paste for the chrome plating effect aerosol paint.
Further, in the step (6), a 400-mesh sieve is selected for sieving. The most suitable mesh number is 400. The mesh is increased, and the sieve is difficult to sieve; the mesh number is reduced, and other impurities are mixed into the aluminum paste.
Further, in the step (6), the mixture is barreled and kept still for more than one week. The flotation value of the flotation type aluminum paste just coming out of the kneader is slightly inferior, and in the period of rest, stearic acid molecules adsorbed on the aluminum sheet are mutually attracted by intermolecular force, so that a compact film layer is formed on the surface of the aluminum sheet, and the flotation value is further improved.
Further, in the step (6), the particle size D50 of the prepared floating type aluminum paste aluminum sheet is 3-5 μm. After ball milling, the raw material spherical aluminum powder exists in the form of aluminum sheets, the particle size is increased firstly, the aluminum sheets can be finely ground in the subsequent ball milling process, the particle size can be reduced, and the particle size of the finally obtained aluminum sheets is slightly larger than that of the raw material spherical aluminum powder.
The invention has the following beneficial effects:
1. the ball milling of the invention is divided into three stages, and different rotating speeds are respectively adopted, so that the three steps of ball milling, aluminum sheet surface polishing and aluminum sheet surface treatment are completed in the ball mill at one time, and the process steps are greatly reduced.
2. The chrome-plating effect aerosol paint can have a mirror effect, mainly aluminum sheets float on the uppermost layer of a paint film compactly, the surface is smooth, and light rays irradiated on the paint film layer generate mirror reflection, so the aerosol paint has the mirror effect, and the influence factors of the mirror effect mainly include several aspects: 1. the surface of the aluminum sheet needs to be smooth and flat; 2, the aluminum sheet has strong floating capacity. The storage stability of the aerosol paint is mainly influenced by moisture, a small amount of moisture can be carried in raw materials (mainly solvents) of the aerosol paint more or less, the moisture in the air can enter the aerosol paint along with production, the water can slowly react with an aluminum sheet, and the floating performance of the aluminum sheet is finally influenced.
3. The temperature of the whole ball milling process is maintained at 50 +/-5 ℃, so that the stearic acid can be well dissolved in the solvent oil even in winter with lower temperature, and the reaction rate is consistent with that at high temperature.
4. According to the invention, stearic acid modified nano-alumina is introduced, on one hand, the stearic acid modified nano-alumina can prevent water from permeating into the surface of an aluminum sheet, and the storage stability of the aerosol paint is prolonged; on the other hand, a large amount of stearic acid is adsorbed on the surface of the nano aluminum oxide, so that the floating capacity of the aluminum sheet can be further improved.
TABLE 1 comparison of the present invention with the existing products
Figure BDA0002705559510000061
Detailed Description
The following examples of the invention are described in detail, but the invention can be carried out in many different ways, which are defined and covered by the following.
In the present specification, the percentages are percentages by mass, unless otherwise specified.
In each example, the preparation method of stearic acid modified nano alumina is shown in the optimal process of the prior art: a process for modifying nano-class alumina with stearic acid, Yangylin, etc. includes volume 40, pages 1, 8-12 and 3 months 2018.
Example 1
A production method of floating type aluminum paste for chrome plating effect aerosol paint comprises the following steps:
(1) stearic acid pre-dispersion:
mixing stearic acid: 1: 1.2, then heating the mixture to 45 ℃, and continuously stirring until the stearic acid is completely dissolved in the solvent oil to obtain the pre-dispersed stearic acid.
In each step, the solvent oil is D50 solvent oil.
(2) Feeding:
and (2) taking solvent oil, mixing the solvent oil, the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) in a ball mill according to the following parts by mass: spherical aluminum powder: 120 parts by mass of pre-dispersed stearic acid: 100 parts by mass: 8 parts by mass.
A variable-frequency horizontal ball mill is adopted, the total number of the horizontal ball mill is two layers, and the method is equivalent to the method that a stainless steel jacket is coated outside a roller of the original ball mill. In the whole ball milling process, balls and ball milling materials are arranged in the roller, and water with different temperatures is arranged between the roller and the jacket so as to ensure the temperature in the ball mill.
When the temperature is low, the product is kept at 45 ℃ in the ball milling stage by heating measures, and the method can solve the problem that the floating value of the floating aluminum paste produced in a low-temperature environment is not enough.
In the step (2), the spherical aluminum powder D50 is 1-3 μm.
In the step (2), the diameter of the ball in the ball mill is 1 mm. A stainless steel ball is selected.
(3) A first ball milling stage: adjusting the rotating speed of the ball mill to 30r/min, and carrying out ball milling for 30 hours.
The main purpose of the stage is to grind the spherical aluminum powder into aluminum sheets with D50 of 3-5 μm.
(4) Ball milling in a second stage: adding 30-50 parts by mass of solvent oil into a ball mill, adjusting the rotating speed of the ball mill to 20r/min, and carrying out ball milling for 8 hours.
The purpose of the stage is mainly to polish the surface of the aluminum sheet, so that the surface of the aluminum sheet becomes smooth and flat, and the thickness of the aluminum sheet is further reduced, thereby improving the mirror surface effect of the aerosol paint.
(5) A third ball milling stage: adding stearic acid modified nano alumina into a ball mill, adjusting the rotating speed of the ball mill to 12r/min, and carrying out ball milling for 1 hour.
In the step (5), the weight ratio of the stearic acid modified nano aluminum oxide to the spherical aluminum powder raw material in the step (2) is 0.5: 100.
(6) discharging the aluminum paste in the ball mill, selecting a 400-mesh sieve for sieving, and then performing filter pressing, kneading, barreling and standing for a week to prepare the floating aluminum paste for the chrome plating effect aerosol paint.
In the step (6), the particle size D50 of the prepared floating type aluminum paste aluminum sheet is 3-5 μm.
Example 2
A production method of floating type aluminum paste for chrome plating effect aerosol paint comprises the following steps:
(1) pre-dispersing stearic acid:
mixing stearic acid: 1: 1.3, heating the mixture to 50 ℃, and continuously stirring until the stearic acid is completely dissolved in the solvent oil to obtain the pre-dispersed stearic acid.
In each step, the solvent oil is D80 solvent oil.
(2) Feeding:
taking solvent oil, and mixing the solvent oil, the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) in a ball mill according to the following parts by mass: spherical aluminum powder: pre-dispersed stearic acid is 160 parts by mass: 100 parts by mass: 10 parts by mass.
A variable-frequency horizontal ball mill is adopted, the total number of the horizontal ball mill is two layers, and the method is equivalent to the method that a stainless steel jacket is coated outside a roller of the original ball mill. In the whole ball milling process, balls and ball milling materials are arranged in the roller, and water with different temperatures is arranged between the roller and the jacket so as to ensure the temperature in the ball mill.
In the step (2), the spherical aluminum powder D50 is 1-3 μm.
In the step (2), the diameter of the ball in the ball mill is 1 mm. Zirconia balls are used.
(3) A first ball milling stage: adjusting the rotating speed of the ball mill to 40r/min, and ball-milling for 20 hours.
The main purpose of the stage is to grind the spherical aluminum powder into aluminum sheets with D50 of 3-5 mu m.
(4) Ball milling in a second stage: adding 50 parts by mass of solvent oil into a ball mill, adjusting the rotating speed of the ball mill to 20r/min, and carrying out ball milling for 8 hours.
(5) A third ball milling stage: adding stearic acid modified nano alumina into a ball mill, adjusting the rotating speed of the ball mill to 12r/min, and carrying out ball milling for 2 hours.
In the step (5), the weight ratio of the stearic acid modified nano aluminum oxide to the spherical aluminum powder raw material in the step (2) is 1: 100.
(6) discharging the aluminum paste in the ball mill, selecting a 400-mesh sieve for sieving, and then performing filter pressing, kneading, barreling and standing for a week to prepare the floating aluminum paste for the chrome plating effect aerosol paint.
In the step (6), the particle size D50 of the prepared aluminum sheet of the floating type aluminum paste is 3-5 μm.
Example 3
A production method of floating type aluminum paste for chrome plating effect aerosol paint comprises the following steps:
(1) pre-dispersing stearic acid:
mixing stearic acid: 1: 1.5, heating the mixture to 55 ℃, and continuously stirring until the stearic acid is completely dissolved in the solvent oil to obtain the pre-dispersed stearic acid.
In each step, the solvent oil is D50 solvent oil.
(2) Feeding:
taking solvent oil, and mixing the solvent oil, the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) in a ball mill according to the following parts by mass: spherical aluminum powder: 160 parts by mass of pre-dispersed stearic acid: 100 parts by mass: 16 parts by mass.
A variable-frequency horizontal ball mill is adopted, the total number of the horizontal ball mill is two layers, and the method is equivalent to the method that a stainless steel jacket is coated outside a roller of the original ball mill. In the whole ball milling process, balls and ball milling materials are arranged in the roller, and water with different temperatures is arranged between the roller and the jacket so as to ensure the temperature in the ball mill.
When the temperature is lower, the product is kept at a certain temperature in the ball milling stage by heating measures, and the method can solve the problem that the floating value of the floating type aluminum paste produced in a low-temperature environment is not enough.
In the step (2), the spherical aluminum powder D50 is 1-3 μm.
In the step (2), the diameter of the ball in the ball mill is 1 mm. Stainless steel balls are used.
(3) A first ball milling stage: adjusting the rotating speed of the ball mill to 40r/min, and ball-milling for 20 hours.
The main purpose of the stage is to grind the spherical aluminum powder into aluminum sheets with D50 of 3-5 μm.
(4) Ball milling in a second stage: adding 50 parts by mass of solvent oil into a ball mill, adjusting the rotating speed of the ball mill to 20r/min, and carrying out ball milling for 8 hours.
(5) A third ball milling stage: adding stearic acid modified nano alumina into a ball mill, adjusting the rotating speed of the ball mill to 12r/min, and carrying out ball milling for 1 hour.
In the step (5), the weight ratio of the stearic acid modified nano aluminum oxide to the spherical aluminum powder raw material in the step (2) is 2: 100.
(6) discharging the aluminum paste in the ball mill, screening by using a 400-mesh sieve, and then performing filter pressing, kneading, barreling and standing for a week to prepare the floating aluminum paste for the chrome plating effect aerosol paint.
In the step (6), the particle size D50 of the prepared aluminum sheet of the floating type aluminum paste is 3-5 μm.
Comparative example 1
A production method of floating type aluminum paste for chrome plating effect aerosol paint comprises the following steps:
(1) stearic acid pre-dispersion:
and (3) mixing stearic acid: 1: 0.8, heating the mixture to 40 ℃, and continuously stirring until the stearic acid is completely dissolved in the solvent oil to obtain the pre-dispersed stearic acid.
In each step, the solvent oil is H150 solvent oil.
Less solvent oil, lower temperature, and incomplete dissolution of stearic acid.
(2) Feeding:
putting the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) into a ball mill to be mixed according to the following mass portions, and mixing with solvent oil: spherical aluminum powder: pre-dispersed stearic acid is 160 mass portions: 100 parts by mass: 10 parts by mass.
Ball milling is carried out at normal temperature of 25 ℃ by adopting a common ball mill.
In the step (2), the spherical aluminum powder D50 is 5-6 μm.
In the step (2), zirconia balls are selected, and the diameter of the balls in the ball mill is 3 mm.
(3) Ball milling: adjusting the rotation speed of the ball mill to 30r/min, and ball-milling for 39 hours.
(4) Discharging the aluminum paste in the ball mill, selecting a 400-mesh sieve for sieving, and then performing filter pressing, kneading, barreling and standing for a week to obtain the floating aluminum paste.
The particle size D50 of the aluminum sheet of the floating aluminum paste is 9-11 μm.
Comparative example 2
A production method of floating type aluminum paste for chrome plating effect aerosol paint comprises the following steps:
(1) stearic acid pre-dispersion:
mixing stearic acid: 1: 1.8, then heating the mixture to 60 ℃, and continuously stirring until the stearic acid is completely dissolved in the solvent oil to obtain the pre-dispersed stearic acid.
In each step, the solvent oil is D50 solvent oil.
(2) Feeding:
and (2) taking solvent oil, mixing the solvent oil, the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) in a ball mill according to the following parts by mass: spherical aluminum powder: pre-dispersed stearic acid 120 parts by mass: 100 parts by mass: and 5 parts by mass.
In the step (2), a variable-frequency horizontal ball mill is adopted, and the horizontal ball mill has two layers in total, namely, a stainless steel jacket is coated outside a roller of the original ball mill. In the whole ball milling process, balls and ball milling materials are arranged in the roller, and water with different temperatures is arranged between the roller and the jacket to ensure that the temperature in the ball mill is 60 ℃.
In the step (2), the spherical aluminum powder D50 is 1-3 μm.
In the step (2), the ball size in the ball mill is 1 mm. A stainless steel ball is selected.
(3) A first ball milling stage: adjusting the rotating speed of the ball mill to be 20r/min, and carrying out ball milling for 30 hours.
(4) Ball milling in a second stage: adjusting the rotating speed of the ball mill to 15r/min, and carrying out ball milling for 8 hours.
(5) A third ball milling stage: adjusting the rotating speed of the ball mill to 12r/min, and ball-milling for 3 hours.
(6) Discharging the aluminum paste in the ball mill, screening by using a 400-mesh sieve, and then performing filter pressing, kneading, barreling and standing for one week to obtain the floating aluminum paste.
The particle size D50 of the prepared aluminum flake of the floating aluminum paste is 4-6 μm.
Performance detection
The floating type aluminum paste obtained in examples 1 to 3 and comparative examples 1 to 2 was subjected to performance testing, and the results are shown in the following table:
TABLE 2 comparison of the results of testing the properties of the floating aluminum pastes obtained in the examples and comparative examples
Figure BDA0002705559510000111
The detection method comprises the following steps:
the floating value detection method standard is as follows: HG/T2456.1-2013.
Specific conditions for heat storage: after the hand spray paint is prepared according to the formula, the hand spray paint is placed into a thermostat at 50 ℃ for storage, and the spray plate is taken out after corresponding days.
The detection method in table 1 is the same.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The production method of the floating type aluminum paste for the chrome plating effect aerosol paint is characterized by comprising the following steps of:
(1) pre-dispersing stearic acid:
mixing stearic acid and solvent oil, heating the mixture, and continuously stirring until the stearic acid is completely dissolved in the solvent oil to obtain pre-dispersed stearic acid;
(2) feeding:
taking solvent oil, and mixing the solvent oil, the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) in a ball mill;
(3) a first ball milling stage: adjusting the rotating speed of the ball mill, and performing first ball milling to grind the spherical aluminum powder into aluminum sheets with D50 of 3-5 mu m;
(4) ball milling in a second stage: adding solvent oil into the ball mill, adjusting the rotating speed of the ball mill, performing secondary ball milling to reduce the thickness of the aluminum sheet, and polishing the surface of the aluminum sheet;
(5) a third ball milling stage: adding stearic acid modified nano alumina into a ball mill, adjusting the rotating speed of the ball mill, and performing third ball milling to enable the stearic acid modified nano alumina to be adsorbed to the surface of the aluminum sheet; wherein the weight ratio of the stearic acid modified nano alumina to the spherical aluminum powder raw material in the step (2) is 0.5-2: 100, respectively;
(6) discharging the aluminum paste in the ball mill, screening, then carrying out filter pressing, kneading, barreling and standing to prepare the floating aluminum paste for the chrome plating effect aerosol paint.
2. The production method of the floating type aluminum paste for the chrome plating effect aerosol paint as claimed in claim 1, wherein in the step (1), the mass ratio of stearic acid to the solvent oil is 1: 1.2-1.5; and the mixture was heated to 50 + -5 deg.C.
3. The method for producing floating type aluminum paste for chrome effect aerosol paint as claimed in claim 1 or 2, wherein in each step, the solvent oil is at least one of aromatic hydrocarbon solvent and alkane solvent.
4. The method for producing floating type aluminum paste for chrome effect aerosol paint as claimed in claim 3, wherein in each step, the solvent oil is D50 solvent oil or D80 solvent oil.
5. The production method of the floating type aluminum paste for the chrome plating effect aerosol paint as claimed in claim 1 or 2, wherein in the step (2), the solvent oil, the spherical aluminum powder and the pre-dispersed stearic acid obtained in the step (1) are mixed in a ball mill according to the following parts by mass: spherical aluminum powder: 160 portions of pre-dispersed stearic acid (120 portions by mass): 100 parts by mass: 8-16 parts by mass; and a frequency conversion horizontal ball mill is adopted.
6. The method for producing the floating type aluminum paste for the aerosol paint with chromium plating effect according to the claim 1 or 2, characterized in that in the step (2), the spherical aluminum powder D50 of the raw material is less than or equal to 3 μm; and the diameter of the ball in the ball mill is less than 2 mm; and stainless steel balls or zirconia balls are used.
7. The method for producing floating type aluminum paste for aerosol paint with chrome plating effect according to claim 1 or 2, wherein in the step (3), the rotating speed of the ball mill is adjusted to 30-40 r/min, and the ball mill is used for 20-30 hours; in the step (4), 30-50 parts by mass of solvent oil is added into the ball mill, the rotating speed of the ball mill is adjusted to 15-20r/min, and the ball milling is carried out for 8-12 hours.
8. The production method of the floating type aluminum paste for the chrome plating effect aerosol paint as claimed in claim 1 or 2, wherein in the step (5), stearic acid modified nano aluminum oxide is added into a ball mill, the rotating speed of the ball mill is adjusted to 8-12r/min, and the ball milling is carried out for 1-3 hours.
9. The process for producing leafing aluminum paste for aerosol paint with chrome plating effect according to claim 1 or 2, wherein in the step (6), the obtained leafing aluminum paste has an aluminum flake grain size D50 of 3-5 μm.
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