CN116200211A

CN116200211A - Wax composition, wax for coating, preparation method and application thereof

Info

Publication number: CN116200211A
Application number: CN202111453708.9A
Authority: CN
Inventors: 龙俊英; 秦绍东
Original assignee: China Energy Investment Corp Ltd; National Institute of Clean and Low Carbon Energy
Current assignee: China Energy Investment Corp Ltd; National Institute of Clean and Low Carbon Energy
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2023-06-02

Abstract

The invention relates to the technical field of wax for coating, in particular to a wax composition, wax for coating, a preparation method and application thereof. The invention discloses a wax composition for coating, which comprises the following components: cobalt-based refined Fischer-Tropsch wax, cobalt-based hydrogenated Fischer-Tropsch wax, high molecular polymer wax, microcrystalline wax and metal stearate; wherein the cobalt-based hydrogenated Fischer-Tropsch wax is a mixture of cobalt-based hydroisomerized Fischer-Tropsch wax and cobalt-based hydrocracking Fischer-Tropsch wax. The wax for coating prepared by the wax composition has good temperature resistance, surface smoothness, abrasion resistance, bending resistance, dispersibility and peeling resistance, and the coating added with the wax for coating has good abrasion resistance, peeling resistance and temperature resistance and can be used as an internal and external lubricant of a compact instrument working at high temperature.

Description

Wax composition, wax for coating, preparation method and application thereof

Technical Field

The invention relates to the technical field of wax for coating, in particular to a wax composition, wax for coating, a preparation method and application thereof.

Background

The wax for coating is mainly added to the coating in the form of an additive, and the wax-based additive is generally present in the form of an aqueous emulsion, and is originally used for improving the surface anti-spreading property of the coating film, mainly including improving the smoothness, scratch resistance and water resistance of the coating film. In addition, the wax for coating can also affect the rheological property of the coating, and the addition of the wax can lead the orientation of solid particles such as aluminum powder in the metal flashing paint to be uniform. Therefore, the wax for coating is often added to various coatings such as a pharmaceutical packaging coating, an antirust paint, a varnish, a floor paint, and the like. The high-temperature working precision instrument needs an internal lubricant and an external lubricant, the external lubricant can increase the lubricity of the plastic surface during processing, and the adhesion force between the plastic and the metal surface is reduced, so that the mechanical shearing force is reduced to the minimum, and the aim of easy processing and forming under the condition of not damaging the plastic performance is fulfilled. The internal lubricant can reduce the internal friction of the polymer, increase the melting rate and the melt deformability of the plastic, reduce the melt viscosity and improve the plasticizing performance, and has better compatibility with the polymer, reduce the friction among molecular chains and improve the flow performance; while the external lubricant requires a certain compatibility with the polymer, reducing the friction of the polymer with the surface of the processing machine. In precision instruments, both an external lubricant with a certain fluidity and an internal lubricant that reduces the mechanical friction during the operation of the machine are required. At present, the wax for the coating is mainly polyethylene wax, because the polyethylene wax has moderate hardness. However, domestic polyethylene wax cannot meet the requirements of high-temperature-resistant, abrasion-resistant and low-tack-free coatings when added alone because of the limitations of poor water resistance, low friction resistance and poor surface strength, and uneven peeling resistance and high-temperature resistance. Moreover, the precision instruments working at high temperature generally need two kinds of lubricants, namely an inner lubricant and an outer lubricant, but the existing outer lubricant has poor adhesive force, poor extrusion effect and high temperature difference resistance.

Fischer-Tropsch wax is a methylene polymer, is an alkane synthesized from hydrocarbon-based synthesis gas or natural gas, and has wide application in various fields: fischer-Tropsch wax can be applied to plastic processing, such as injection molding, extrusion and granulation industries; the Fischer-Tropsch wax is applied to the production process of color master batches and modified plastics, and is helpful for the dispersion and excellent smoothness of the filler during mixing; the Fischer-Tropsch wax can be used as an external lubricant of PVC, the low viscosity of the Fischer-Tropsch wax can improve the production speed of products, is favorable for the dispersion of fillers during mixing, has a better effect in the extrusion of a high-viscosity system, has 40-50% less additive amount than that of common polyethylene wax, and can obviously improve the surface gloss and good back tack of products; among dyes, the melted Fischer-Tropsch wax can effectively wet the dye, and reduce the base viscosity; when the Fischer-Tropsch wax is used in the ink in the form of fine powder, the wear resistance and the wrinkle resistance of the material can be improved; the coating can be applied to the coating to increase the brightness and the dispersibility of the coating and improve the glossiness and the smoothness of the product; the lubricating effect is achieved in the extrusion process when the lubricating agent is added into powder coating resin, so that screw torque can be reduced, energy consumption is reduced, and production efficiency is improved. However, fischer-Tropsch waxes are often used as a single source of additives and when used in a coating, the high oil content of the Fischer-Tropsch wax results in the coating being susceptible to flaking.

CN110305584a discloses a PE wax for hot-melt road marking paint, which is prepared from 95 type refined fischer-tropsch wax, zinc stearate, high molecular polyethylene wax, and PE oligomer, and has good dispersibility, adhesion, proper construction opening time, excellent surface leveling and system anti-settling effects, and good anti-fouling and wetting properties. However, the invention only improves the performance of the wax for the hot melt road performance coating, but does not solve the problems of poor water resistance, low friction resistance, poor surface strength, poor high temperature resistance and the like of the polyethylene wax, and cannot be applied to other fields. In addition, the problem that Fischer-Tropsch wax is poor in laminating property and easy to peel is not solved.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provide a wax composition, a coating wax, a preparation method thereof, a coating and applications thereof, wherein the coating wax has good toughness, good reusability, neutral pH value, good internal and external lubricity, better temperature resistance, surface smoothness, abrasion resistance, bending resistance, dispersibility and peeling resistance, and the coating added with the coating wax has good abrasion resistance, peeling resistance and temperature resistance and can be used as an internal and external lubricant of a compact instrument working at high temperature.

The present invention provides in a first aspect a wax composition for a coating, wherein the wax composition comprises: cobalt-based refined Fischer-Tropsch wax, cobalt-based hydrogenated Fischer-Tropsch wax, high molecular polymer wax, microcrystalline wax and metal stearate;

wherein the cobalt-based hydrogenated Fischer-Tropsch wax is a mixture of cobalt-based hydroisomerized Fischer-Tropsch wax and cobalt-based hydrocracking Fischer-Tropsch wax.

In a second aspect, the present invention provides a method for preparing a wax for paint using the above wax composition, comprising the steps of:

(1) Carrying out first mixing melting on cobalt-based refined Fischer-Tropsch wax and cobalt-based hydrogenated Fischer-Tropsch wax to obtain liquid Fischer-Tropsch wax;

(2) Performing second mixing and melting on the liquid Fischer-Tropsch wax, the metal stearate and the dispersing agent to obtain a metal stearate Fischer-Tropsch wax mixture;

(3) Performing third mixing melting on the metal stearate Fischer-Tropsch wax mixture, the high-molecular polymer wax and the microcrystalline wax to obtain liquid mixed wax;

(4) Carrying out melt mixing and heat preservation on the liquid mixed wax to obtain liquid Fischer-Tropsch modified wax;

(5) Granulating and screening the liquid Fischer-Tropsch modified wax to obtain wax for the coating;

wherein, the auxiliary agent is added in the step (3) and the step (4) respectively or the auxiliary agent is added in the step (4) only.

In a third aspect, the present invention provides a wax for paint prepared by the foregoing method.

In a fourth aspect, the present invention provides a paint, wherein the paint contains the wax for paint.

In a fifth aspect, the present invention provides a wax for use in the above coating or the use of the above coating in precision instrument coatings.

Through the technical scheme, the method is specifically characterized in that:

1. compared with the traditional polyethylene wax powder, the wax for the coating has better temperature resistance, surface smoothness, abrasion resistance, bending resistance, dispersibility and peeling resistance, good toughness, good recycling property, neutral pH value and good internal and external lubricity, and the peeling resistance and the temperature resistance of different degrees can be controlled according to the proportion;

2. the wax composition of the invention contains cobalt-based refined Fischer-Tropsch wax and cobalt-based hydrogenated Fischer-Tropsch wax, and not only improves the temperature resistance, the surface smoothness and the wear resistance of the prepared wax for the coating by utilizing the characteristics of high melting point and low viscosity of the cobalt-based refined Fischer-Tropsch wax, but also improves the anti-tack property of the prepared wax for the coating by utilizing the soft tack characteristic of the cobalt-based hydrogenated Fischer-Tropsch wax.

3. The refined Fischer-Tropsch wax is prepared by taking the Fischer-Tropsch wax prepared by a cobalt-based fixed bed technology as a raw material, the cobalt-based refined Fischer-Tropsch wax has a high dropping melting point, the aromatic hydrocarbon content of the cobalt-based refined Fischer-Tropsch wax is lower than 100ppm by mass, and the cobalt-based refined Fischer-Tropsch wax is mostly monocyclic aromatic hydrocarbon, is nontoxic and environment-friendly, and can be used as a wax for food or medicine packaging coating.

4. The abrasion resistance and the temperature resistance of the paint added with the wax for the paint are obviously improved, and the wax for the paint is suitable for high-temperature paint; in addition, the coating material containing the wax for coating material of the present invention has both high-temperature tackiness, fluidity and friction resistance, and can exhibit dual functions of an inner lubricant and an outer lubricant when used as a lubricant for high-temperature precision instruments.

Detailed Description

The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.

In some embodiments of the invention, the cobalt-based refined Fischer-Tropsch wax is present in an amount of from 20 to 80 weight percent, the cobalt-based hydrogenated Fischer-Tropsch wax is present in an amount of from 5 to 30 weight percent, the polymeric wax is present in an amount of from 0.5 to 30 weight percent, the microcrystalline wax is present in an amount of from 3 to 20 weight percent, and the metal stearate is present in an amount of from 1.5 to 20 weight percent, based on the total weight of the wax composition.

In some embodiments of the invention, the cobalt-based refined Fischer-Tropsch wax may be used in an amount of any one of 20 wt.%, 25 wt.%, 30 wt.%, 35 wt.%, 40 wt.%, 45 wt.%, 50 wt.%, 55 wt.%, 60 wt.%, 65 wt.%, 70 wt.%, 75 wt.%, 80 wt.%, or a range of any two of the foregoing values, based on the total weight of the wax composition.

In some embodiments of the invention, the cobalt-based hydrogenated Fischer-Tropsch wax may be used in an amount of any one of 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.%, 30 wt.%, or a range of any two of the foregoing values, based on the total weight of the wax composition.

In some embodiments of the present invention, the polymeric wax may be used in an amount ranging from 0.5 wt.%, 1 wt.%, 5 wt.%, 6 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.%, 30 wt.%, or any combination of any two of the foregoing values, based on the total weight of the wax composition.

In some embodiments of the present invention, the microcrystalline wax may be used in an amount ranging from any one of 3 wt.%, 5 wt.%, 6 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, or any two of the foregoing values, based on the total weight of the wax composition.

In some embodiments of the present invention, the metal stearate may be used in an amount ranging from 1.5% by weight, 4% by weight, 5% by weight, 10% by weight, 15% by weight, 20% by weight, or any combination thereof, based on the total weight of the wax composition.

In some embodiments of the invention, the cobalt-based refined Fischer-Tropsch wax is present in an amount of from 40 to 75 weight percent, the cobalt-based hydrogenated Fischer-Tropsch wax is present in an amount of from 10 to 20 weight percent, the polymeric wax is present in an amount of from 6 to 25 weight percent, the microcrystalline wax is present in an amount of from 6 to 15 weight percent, and the metal stearate is present in an amount of from 3 to 20 weight percent, based on the total weight of the wax composition.

In some embodiments of the invention, the cobalt-based refined Fischer-Tropsch wax is present in an amount of from 50 to 75 weight percent, the cobalt-based hydrogenated Fischer-Tropsch wax is present in an amount of from 5 to 20 weight percent, the polymeric wax is present in an amount of from 5 to 15 weight percent, the microcrystalline wax is present in an amount of from 5 to 15 weight percent, and the metal stearate is present in an amount of from 1.5 to 10 weight percent, based on the total weight of the wax composition.

In some embodiments of the invention, the polymeric wax has an average molecular weight of 10000-25000g/mol.

In some embodiments of the present invention, the polymeric wax is at least one of polyethylene wax, polypropylene wax and polytetrafluoroethylene wax, and more preferably polyethylene wax. Preferably, when the polymeric wax is a polypropylene wax, the coating material is prepared to have high temperature and chemical resistance, and the polypropylene wax is used in an amount of 1 to 5 wt% based on the total weight of the wax composition. Preferably, when the polymeric wax is polytetrafluoroethylene wax, the prepared coating has good processability, and the polytetrafluoroethylene wax is used in an amount of 0.5 to 4% by weight based on the total weight of the wax composition.

The metal stearate in the present invention may be a metal stearate commonly used in the art. Preferably, the metal stearate of the present invention is selected from at least one of zinc stearate and calcium stearate.

The microcrystalline wax of the present invention may be any microcrystalline wax commonly used in the art, for example, at least one of 70-size microcrystalline wax and 80-size microcrystalline wax.

In the present invention, the microcrystalline wax may be obtained commercially or by preparation. Wherein the microcrystalline wax is prepared by methods well known to those skilled in the art and will not be described in detail herein.

In the invention, the cobalt-based Fischer-Tropsch wax refers to Fischer-Tropsch wax prepared by using a cobalt-based fixed bed technology, the cobalt-based refined Fischer-Tropsch wax refers to Fischer-Tropsch wax obtained by hydrofining cobalt-based Fischer-Tropsch wax as a raw material, and the cobalt-based hydrogenated Fischer-Tropsch wax refers to a mixture of cobalt-based hydroisomerized Fischer-Tropsch wax and cobalt-based hydrocracked Fischer-Tropsch wax.

The inventor unexpectedly found in the research process that the cobalt-based refined Fischer-Tropsch wax has the characteristics of high drop melting point, low oil content and low aromatic hydrocarbon content, and the cobalt-based hydrogenated Fischer-Tropsch wax has the characteristics of low penetration and low shrinkage, so that the dispersibility of the prepared wax for the coating can be improved.

In some embodiments of the invention, the cobalt-based refined Fischer-Tropsch wax has a drop melting point of 90-115 ℃, such as 90 ℃, 95 ℃, 100 ℃, 105 ℃, 115 ℃.

In some embodiments of the invention, the cobalt-based refined Fischer-Tropsch wax has a carbon number distribution of C in order to further increase the high temperature adhesion of the resulting coating wax ₁₀ -C ₁₄₀ 。

In some embodiments of the present invention, the cobalt-based refined fischer-tropsch wax has an aromatics content of 30-100ppm by mass, and the aromatics content of the monocyclic aromatics is 20-60% of the total weight of the aromatics.

In some embodiments of the invention, the cobalt-based refined Fischer-Tropsch wax has a normal paraffin content of greater than or equal to 95 wt.% based on the total weight of the cobalt-based refined Fischer-Tropsch wax, wherein C in the cobalt-based refined Fischer-Tropsch wax ₁₀ -C ₆₀ The n-alkane content of (C) is 24-37 wt% ₆₁ -C ₈₀ The content of normal alkane is 32.5-41.5 wt%, C ₈₁ The content of the normal alkane is 25-42.4 wt%.

In some embodiments of the invention, the cobalt based refined Fischer-Tropsch wax has a distillation range of 400 to 650 ℃, wherein the wax content of the distillation range of 550 to 650 ℃ is more than 45 wt%, preferably 50 to 85 wt%, based on the total weight of the cobalt based refined Fischer-Tropsch wax. In some embodiments of the invention, the wax having a distillation range of 500-650 ℃ comprises 70-100 wt% of the total weight of the cobalt-based refined Fischer-Tropsch wax. When the cobalt-based refined Fischer-Tropsch wax meets the conditions, the prepared wax for the coating has good temperature resistance.

The carbon number distribution of the cobalt-based refined Fischer-Tropsch wax is measured by a chromatographic method; the content of n-alkane is measured by a gas chromatography method; the n-alkane content of different carbon number distribution is measured by a gas chromatography method; the distillation range and the wax content of the distillation range of 500-650 ℃ and 550-650 ℃ are measured by a high-temperature simulated distillation method; the content of aromatic hydrocarbon is measured by an ultraviolet-visible spectrum method; drop melting points were determined by the GB/T8026 standard method.

In some embodiments of the invention, the cobalt-based hydrogenated Fischer-Tropsch wax has a drop melting point of 70-100 ℃ in order to further increase high temperature adhesion and reduce shrinkage.

In some embodiments of the invention, the cobalt-based hydrogenated Fischer-Tropsch wax has a kinematic viscosity at 100℃of 11-30mm/s in order to further improve the anti-friction properties of the resulting coating.

In some embodiments of the invention, the cobalt-based hydrogenated Fischer-Tropsch wax has a carbon number distribution of C ₁₀ -C ₁₂₀ 。

In some embodiments of the invention, the cobalt-based hydrogenated Fischer-Tropsch wax has a penetration of 7 to 30 (0.1 mm) and an oil content of 0.01 to 5 wt%.

In some embodiments of the invention, the cobalt-based hydrogenated Fischer-Tropsch wax has an average molecular weight of 1200 to 2500g/mol. When the average molecular weight of the cobalt-based hydrogenated Fischer-Tropsch wax is within the above range, the wear resistance of the prepared wax for the coating can be improved.

In some preferred embodiments of the present invention, the cobalt-based hydrogenated Fischer-Tropsch wax has a carbon number distribution of C in order to further improve the wear resistance and temperature resistance of the resulting coating wax ₂₅ -C ₁₂₀ 。

In some embodiments of the invention, the cobalt-based hydroisomerized wax is present in an amount of from 5 to 15 wt% and the cobalt-based hydrocracked wax is present in an amount of from 85 to 95 wt% based on the total weight of the cobalt-based hydrogenated Fischer-Tropsch wax in order to increase the ductility of the final coating.

In some embodiments of the invention, the cobalt-based hydrogenated Fischer-Tropsch wax has a shrinkage of from 0.2% to 1.0%.

The average molecular weight of the cobalt-based hydrogenated Fischer-Tropsch wax is determined by gas chromatography; the carbon number distribution is measured by a chromatographic method; the kinematic viscosity at 100 ℃ is measured by a standard method of a viscometer GB/T265; drop melting point was measured by GB/T8026 standard method; penetration is measured by ASTM D-1321 standard method; the oil content is measured by GB/T3554 standard method; shrinkage was measured by DIN16901 standard method.

In some preferred embodiments of the present invention, the cobalt-based refined Fischer-Tropsch wax is prepared by: the pressure is controlled to be 5.5-6.5MPa under the feeding condition of hydrogen-oil ratio of 500-2000 at 230-340 ℃ and the airspeed of wax is 1-3h ^-1 And (3) in the presence of a noble metal catalyst, the cobalt-based Fischer-Tropsch wax is reacted to obtain the cobalt-based refined Fischer-Tropsch wax. Wherein the noble metal catalyst can be a noble metal catalyst commonly used in the field for preparing cobalt-based refined Fischer-Tropsch wax, for example, pt/Al ₂ O ₃ A catalyst. The cobalt-based refined Fischer-Tropsch wax prepared by the preparation method has low aromatic hydrocarbon content.

In some embodiments of the invention, the cobalt-based Fischer-Tropsch wax is a 95-120 cobalt-based Fischer-Tropsch wax.

In the present invention, the cobalt-based hydrogenated Fischer-Tropsch wax refers to a mixture of cobalt-based hydroisomerized Fischer-Tropsch wax and cobalt-based hydrocracked Fischer-Tropsch wax.

In some preferred embodiments of the invention, the cobalt-based hydrogenated fischer-tropsch wax is prepared by: the cobalt-based Fischer-Tropsch wax is prepared by reacting cobalt-based Fischer-Tropsch wax in the presence of a hydrocracking and isomerism composite catalyst, wherein the reaction conditions are as follows: the temperature is 260-360 ℃, the hydrogen-oil ratio is 500-2000, the pressure is 5-7MPa, and the feeding airspeed of the cobalt-based Fischer-Tropsch wax is 1-2.5h ^-1 . Preferably, the cracking and isomerising composite catalyst refers to a mixed catalyst of hydroisomerisation catalyst and hydrocracking catalyst, wherein the weight ratio of hydroisomerisation catalyst to hydrocracking catalyst is 0.2-3:1. In some embodiments of the present invention, in order to further reduce the carbon number distribution range of the cobalt-based hydrogenated fischer-tropsch wax, the isomerization rate (i.e. the content of hydroisomerized wax) of the product wax is increased, and thus the flexibility of the prepared wax for coating is increased, the cobalt-based fischer-tropsch wax is No. 120 cobalt-based fischer-tropsch wax. Wherein the hydroisomerization catalyst and hydrocracking catalyst may be conventional in the artAlternatively, for example, the hydrocracking catalyst may be a Pt/Si-Al catalyst (e.g., may be a FC-32 catalyst) and the hydroisomerization catalyst may be a Pt/molecular sieve catalyst (e.g., may be a SLD-821 catalyst).

In some embodiments of the present invention, the wax composition may further include an auxiliary agent in order to increase the properties of the resulting coating wax or coating. Preferably, the auxiliary agent is at least one of beeswax, PE oligomer, pentaerythritol stearate (PETS), ethylene bis-stearamide (EBS), an emulsifier and an anti-rust agent.

In some embodiments of the present invention, the wax composition may further include beeswax in an amount of 0.2 to 5 wt% based on the total weight of the wax composition in order to increase the gloss of the prepared coating.

In some embodiments of the present invention, the wax composition may further include PE oligomer in an amount of 1 to 10 wt%, preferably 3 to 8 wt%, based on the total weight of the wax composition, in order to reduce the acid value of the prepared coating.

The PE oligomer is low molecular polyethylene wax in the invention. In some embodiments of the invention, the PE oligomer has an average molecular weight of 7000 to 9000g/mol.

In some embodiments of the present invention, the mass ratio of the polymeric wax to the PE oligomer is 0.2-2:1 in order to further improve the chemical stability of the prepared coating.

In some embodiments of the present invention, the coating wax may further include pentaerythritol stearate (PETS) in an amount of 3 to 15 wt%, preferably 5 to 10 wt%, based on the total weight of the coating wax, in order to improve the lubricity of the coating.

In some embodiments of the present invention, the coating wax may further include Ethylene Bis Stearamide (EBS) in an amount of 2 to 20 wt%, preferably 5 to 10 wt%, based on the total weight of the coating wax, in order to increase compatibility of various waxes.

When the wax composition contains both PETS and EBS in the above amounts, there is a synergistic effect between PETS and EBS, which can further improve the internal and external wear resistance.

In some embodiments of the present invention, the wax composition may further include an anti-rust agent in an amount of 0.5 to 5 wt%, preferably 0.8 to 3 wt%, based on the total weight of the wax composition, in order to improve the anti-rust performance of the resulting coating wax. The antirust agent can be an antirust agent commonly used in the field, and can be at least one of triethanolamine, benzotriazole and pentaerythritol monooleate.

In some embodiments of the invention, the wax composition may further comprise an emulsifier. Preferably, the emulsifier is used in an amount of 1 to 5 wt.%, based on the total weight of the wax composition.

In some embodiments of the present invention, the wax composition may further include a dispersant. Preferably, the dispersant is used in an amount of 0.1 to 2 wt% based on the total weight of the wax composition.

In the present invention, the sum of the contents of all components in the wax composition is 100% by weight. In the present invention, the dispersant may be a dispersant commonly used in the art, for example, may be Guangzhou thick chemical auxiliary Co., ltd

Wax powder dispersants and/or styrene acrylic resins.

The emulsifier of the present invention may be an emulsifier commonly used in the art.

In some embodiments of the invention, each step is performed with agitation. Preferably, in the step (1), the temperature of the first mixed melting is 120-180 ℃, and the stirring speed of the first mixed melting is 10-50r/min; in the step (2), the second mixed melting temperature is 140-180 ℃, and the stirring speed is 10-50r/min; in the step (3), the temperature of the third mixed melting is 140-180 ℃, and the stirring speed of the third mixed melting is 10-50r/min; in the step (4), the melting temperature is 120-140 ℃, the heat preservation temperature is 150-175 ℃, the stirring speed during heat preservation is 10-50r/min, and the heat preservation time is 1-6h.

In some embodiments of the invention, the granulation in step (5) may be performed by techniques conventional in the art. Preferably, the granulation according to the present invention is performed by a granulation tower, the tower wall of which is preferably a stainless steel tower wall, and the granulation nozzle of which is preferably a stainless steel mesh Kong Pentou.

In some embodiments of the invention, the screening in step (5) is through a 80-100 mesh screen.

In the present invention, the amounts and requirements of the components used in the preparation method are the same as those of the wax composition for coating in the present invention, and in order to avoid unnecessary repetition, a detailed description is omitted.

In some embodiments of the invention, the coating wax has a viscosity of less than 20mm/s at 100 ℃, an ash content of less than 0.05 wt%, an oil content of less than 1.3 wt%, and a shrinkage of less than 1%.

In some embodiments of the invention, the coating wax has a viscosity of less than 15mm/s at 100 ℃, an ash content of less than 0.02 wt%, an oil content of less than 0.8 wt%, and a shrinkage of less than 1%.

In some preferred embodiments of the present invention, the coating wax has an oil content of 0.6 to 1.2 wt.%, a shrinkage of 0.1 to 0.8 wt.%, and an ash content of 0.002 to 0.005 wt.%.

In the invention, the shrinkage rate of the wax for the coating is low, and the prepared coating has good temperature resistance.

In the invention, the viscosity of the wax for the coating at 100 ℃ is measured by a GB/T9269-1988 standard method; the oil content of the wax for the coating is measured by a GB/T3554 standard method; shrinkage was measured by DIN16901 standard method; ash content was measured by the GB/T1979-1979 standard method.

In the invention, the coating has strong abrasion resistance, corrosion resistance, adhesion occupation, shrinkage and stripping resistance.

The wax for coating can be applied to common coating in the field, preferably to coating with wax for coating which needs to be added with better temperature resistance, surface smoothness, abrasion resistance and bending resistance, such as rust-proof paint, floor paint, moistureproof paint and the like. The wax for the coating is particularly suitable for being added into a lubricant of a precise instrument, and can be used as an inner lubricant and an outer lubricant simultaneously due to the characteristics of high friction resistance, high fluidity and high mixing viscosity, so that the fluidity of the coating is improved and the shrinkage rate is reduced in the process of forming the coating, the utilization efficiency of the coating is improved, the use amount of the coating is reduced, and the final product has extremely high surface smoothness, smoothness and spalling resistance.

In some preferred embodiments of the present invention, the coating is an internal lubricant and/or an external lubricant for high temperature working precision instruments.

In some embodiments of the invention, the precision instrument coating is a precision instrument coating that operates at high temperatures.

In some embodiments of the invention, the precision instrument coating is a precision instrument lubricant, preferably an internal lubricant and/or an external lubricant.

In some preferred embodiments of the present invention, the precision instrument coating refers to an internal lubricant and/or an external lubricant of a precision instrument that operates at high temperatures.

The present invention will be described in detail by examples. In the following examples, the abrasion of the wax for coating was measured by GB/T1768-2006 standard method.

The gloss of the coating wax was measured by the GB1743-89 standard method.

The hardness of the coating wax was measured by the BS EN ISO 11127-4-2011 standard method.

Impact strength of the coating wax was measured by ISO 6272:1993 (E) standard method.

The adhesion of the wax for the coating was measured by the GB5210-85 standard method.

The viscosity of the coating wax at 100℃was determined by the standard method of GB/T9269-1988.

The oil content of the wax for coating is determined by the GB/T3554 standard method.

The shrinkage of the coating waxes was measured by DIN16901 standard method.

The drop melting point of the coating wax was measured by the GB/T8026 standard method.

The ash content of the coating waxes was determined by the GB/T1979-1979 standard method.

All materials used in the examples below were commercially available unless otherwise specified.

Cobalt-based Fischer-Tropsch waxes No. 90, no. 100 and No. 105 were purchased from Shell and sasol, and the brands were H1, H5 and SX105, respectively.

The preparation method of the No. 120 cobalt-based Fischer-Tropsch wax comprises the following steps: at H ₂ The ratio of the catalyst to CO is 2.05, the pressure is 2.5MPa, the reaction temperature is 215 ℃, and the gas space velocity is 2500h ^-1 In a fixed bed reactor, in Co/TiO ₂ In the presence of a catalyst (the loading of Co is 15wt percent based on the total weight of the catalyst), the cobalt-based Fischer-Tropsch wax of No. 120 is obtained by reaction.

Polyethylene wax is purchased from Nanjing Tianshi under the trademark PEW-0300 and has an average molecular weight of 15000g/mol.

In the following examples, the cracking and isomerising composite catalyst is a mixed catalyst of SLD-821 catalyst (hydroisomerisation catalyst) and FC-32 catalyst (hydrocracking catalyst). Wherein the SLD-821 catalyst is purchased from Shell; FC-32 catalysts were purchased from China petrochemical Co., ltd. Smooth petrochemical institute.

The hydrofining catalyst is FH-40 catalyst and is purchased from China petrochemical industry Co., ltd.

Wax powder dispersants were purchased from Guangzhou thick, chemical auxiliary Co.

Example 1

(1) Heating a beaker to 160 ℃, adding 60 parts by weight of cobalt-based refined Fischer-Tropsch wax and 10 parts by weight of cobalt-based hydrogenated Fischer-Tropsch wax, and stirring at a stirring speed of 20r/min until the cobalt-based refined Fischer-Tropsch wax and the cobalt-based hydrogenated Fischer-Tropsch wax are melted, so as to obtain liquid Fischer-Tropsch wax;

(2) 1.5 parts by weight of zinc stearate and 0.5 part by weight of zinc stearate are added

Cooling wax powder dispersant, stirring at 150deg.C and stirring speed of 20r/min to zinc stearate and +.>

Melting the wax powder dispersing agent to obtain a zinc stearate Fischer-Tropsch wax mixture;

(3) Adding 15 parts by weight of polyethylene wax and 10 parts by weight of 70-grade microcrystalline wax, heating to 160 ℃, and stirring at a stirring speed of 10r/min until the polyethylene wax and the microcrystalline wax are melted to obtain liquid mixed wax;

(4) Adding 3 parts by weight of triethanolamine, completely melting at 120 ℃, and then carrying out heat preservation and stirring for 4 hours at 160 ℃ and a stirring speed of 20r/min to obtain liquid Fischer-Tropsch modified wax;

(5) Granulating the liquid Fischer-Tropsch modified wax obtained in the step (4) through a stainless steel mesh Kong Pentou, and then screening and sieving the liquid Fischer-Tropsch modified wax with a 80-mesh sieve to obtain the wax for the coating.

The preparation method of the cobalt-based refined Fischer-Tropsch wax comprises the following steps: controlling the pressure of No. 100 cobalt-based Fischer-Tropsch wax at 270 ℃ to 6.2MPa and the wax oil airspeed to 1.2h ^-1 Under the feeding condition of hydrogen-oil ratio of 500, cobalt-based refined Fischer-Tropsch wax is obtained through FH-40 catalyst. The components of the prepared cobalt-based refined Fischer-Tropsch wax are C ₄₀ -C ₁₂₀ Alkane, the n-alkane content is 95 weight percent based on the total weight of the cobalt-based refined Fischer-Tropsch wax, wherein the cobalt-based refined Fischer-Tropsch wax C ₁₀ -C ₆₀ The n-alkane content of (C) was 32% by weight ₆₁ -C ₈₀ The n-alkane content of (C) was 35% by weight ₈₁ The above normal paraffins account for 28% by weight. The distillation range of the cobalt-based refined Fischer-Tropsch wax is 450-650 ℃, the wax content of the distillation range of 500-650 ℃ accounts for 70% of the total weight of the cobalt-based refined Fischer-Tropsch wax, and the wax content of the distillation range of 550-650 ℃ accounts for 60% of the total weight of the cobalt-based refined Fischer-Tropsch wax. Drop melting of cobalt-based refined Fischer-Tropsch waxThe point was 100.4℃and the aromatic hydrocarbon content was 40ppm by mass.

The preparation method of the cobalt-based hydrogenated Fischer-Tropsch wax comprises the following steps: feeding No. 90 cobalt-based Fischer-Tropsch wax at 290 ℃, 6.5MPa, 500 hydrogen-oil ratio and 1h of feeding airspeed of the cobalt-based Fischer-Tropsch wax ^-1 Under the reaction conditions of cracking and isomerism composite catalyst (SLD-821 catalyst and FC-32 catalyst weight ratio is 1:1) to obtain cobalt-based hydrogenated Fischer-Tropsch wax. The properties of the cobalt-based hydrogenated Fischer-Tropsch wax are shown in Table 1.

The coatings were subjected to performance testing with waxes and the test results are shown in table 2.

The coating added with wax has good surface smoothness, abrasion resistance, surface dispersion performance, impact resistance, internal and external lubricity and better back tack.

Example 2

(1) Heating a beaker to 150 ℃, adding 50 parts by weight of cobalt-based refined Fischer-Tropsch wax and 20 parts by weight of cobalt-based hydrogenated Fischer-Tropsch wax, and stirring at a stirring speed of 15r/min until the cobalt-based refined Fischer-Tropsch wax and the cobalt-based hydrogenated Fischer-Tropsch wax are melted to obtain liquid Fischer-Tropsch wax;

(2) Adding 5 parts by weight of calcium stearate, heating, and stirring at 160 ℃ and stirring speed of 15r/min until the calcium stearate is melted to obtain a calcium stearate Fischer-Tropsch wax mixture;

(3) Adding 10 parts by weight of polyethylene wax and 10 parts by weight of 80-grade microcrystalline wax, and stirring at 160 ℃ at a stirring speed of 10r/min until the polyethylene wax and the microcrystalline wax are melted to obtain liquid mixed wax;

(4) Adding 5 parts by weight of triethanolamine, completely melting at 140 ℃, and then carrying out heat preservation and stirring for 4 hours at 160 ℃ and stirring speed of 20r/min to obtain liquid Fischer-Tropsch modified wax;

(5) And (3) granulating the liquid Fischer-Tropsch modified wax obtained in the step (4) through a stainless steel mesh Kong Pentou, and screening and sieving the granulated liquid Fischer-Tropsch modified wax through a 80-mesh sieve to obtain the wax for the coating.

The preparation method of the cobalt-based refined Fischer-Tropsch wax comprises the following steps: under 280 ℃ and under the feeding condition of 500 hydrogen-oil ratio, the pressure is controlled to be 6.0MPa, and the wax oil airspeed is 1.2h ^-1 Catalyzed by FH-40The cobalt-based refined Fischer-Tropsch wax is obtained. The cobalt-based refined Fischer-Tropsch wax comprises a component with carbon distribution number of C ₄₀ -C ₁₀₀ Alkane, the normal alkane content is 98.5 weight percent based on the total weight of the cobalt-based refined Fischer-Tropsch wax, wherein the cobalt-based refined Fischer-Tropsch wax C ₁₀ -C ₆₀ The n-alkane content of (C) was 25% by weight ₆₁ -C ₈₀ The n-alkane content of (C) was 41.5% by weight ₈₁ The above normal paraffins account for 32% by weight. The distillation range of the cobalt-based refined Fischer-Tropsch wax is 500-650 ℃, and the content of the wax in the distillation range of 550-650 ℃ accounts for 80% of the total weight of the cobalt-based refined Fischer-Tropsch wax. The cobalt-based refined Fischer-Tropsch wax had a drop melting point of 105℃and an aromatic hydrocarbon content of 45ppm by mass.

The preparation method of the cobalt-based hydrogenated Fischer-Tropsch wax comprises the following steps: feeding No. 105 cobalt-based Fischer-Tropsch wax at 300 ℃, 6.5MPa, 500 hydrogen-oil ratio and 1h of feeding airspeed of the cobalt-based Fischer-Tropsch wax ^-1 Under the reaction conditions of cracking and isomerism composite catalyst (SLD-821 catalyst and FC-32 catalyst weight ratio is 1.5:1) to obtain cobalt-based hydrogenated Fischer-Tropsch wax. The properties of the cobalt-based hydrogenated Fischer-Tropsch wax are shown in Table 1.

The coating added with wax has good surface smoothness, abrasion resistance, surface dispersion performance and impact resistance.

Example 3

(1) Heating a beaker to 160 ℃, adding 55 parts by weight of cobalt-based refined Fischer-Tropsch wax and 20 parts by weight of cobalt-based hydrogenated Fischer-Tropsch wax, and stirring at a stirring speed of 20r/min until the cobalt-based refined Fischer-Tropsch wax and the cobalt-based hydrogenated Fischer-Tropsch wax are melted, so as to obtain liquid Fischer-Tropsch wax;

(2) Adding 5 parts by weight of zinc stearate, cooling, and stirring at 150 ℃ and a stirring speed of 20r/min until the zinc stearate is melted to obtain a zinc stearate Fischer-Tropsch wax mixture;

(3) Adding 10 parts by weight of polyethylene wax and 10 parts by weight of 70 # microcrystalline wax, heating to 160 ℃, and stirring at a stirring speed of 10r/min until the polyethylene wax and the microcrystalline wax are melted to obtain liquid mixed wax;

(4) After the liquid mixed wax is completely melted at 120 ℃, the liquid Fischer-Tropsch modified wax is obtained by heat preservation and stirring for 4 hours at 160 ℃ and a stirring speed of 20 r/min;

The preparation method of the cobalt-based refined Fischer-Tropsch wax comprises the following steps: under 270 ℃ and under the feeding condition of 500 hydrogen-oil ratio, the pressure is controlled to be 6.2MPa, and the wax oil airspeed is 1.2h ^-1 Cobalt-based refined Fischer-Tropsch wax is obtained through an FH-40 catalyst. The components of the prepared cobalt-based refined Fischer-Tropsch wax are C ₁₀ -C ₈₀ Wherein the cobalt-based refined Fischer-Tropsch wax C has an n-alkane content of 97 wt%, based on the total weight of the cobalt-based refined Fischer-Tropsch wax ₁₀ -C ₆₀ The n-alkane content of (C) was 37% by weight ₆₁ -C ₈₀ The n-alkane content of (C) was 35% by weight ₈₁ The above normal alkane content was 25% by weight. The distillation range of the cobalt-based refined Fischer-Tropsch wax is 400-650 ℃, the wax content of the distillation range of 500-650 ℃ accounts for 70% of the total weight of the cobalt-based refined Fischer-Tropsch wax, and the wax content of the distillation range of 550-650 ℃ accounts for 50% of the total weight of the cobalt-based refined Fischer-Tropsch wax. The cobalt-based refined Fischer-Tropsch wax had a drop melting point of 90.8℃and an aromatic hydrocarbon content of 32ppm by mass.

The preparation method of the cobalt-based hydrogenated Fischer-Tropsch wax comprises the following steps: feeding No. 120 cobalt-based Fischer-Tropsch wax at 320 ℃ for 1h at 6.5MPa with a hydrogen-oil ratio of 500 ^-1 Under the reaction conditions of cracking and isomerism composite catalyst (SLD-821 and FC-32 catalyst weight ratio is 1:2) to obtain cobalt-based hydrogenation Fischer-Tropsch wax. The properties of the cobalt-based hydrogenated Fischer-Tropsch wax are shown in Table 1.

Example 4

(1) Heating a beaker to 150 ℃, adding 75 parts by weight of cobalt-based refined Fischer-Tropsch wax and 5 parts by weight of cobalt-based hydrogenated Fischer-Tropsch wax, and stirring at a stirring speed of 15r/min until the cobalt-based refined Fischer-Tropsch wax and the cobalt-based hydrogenated Fischer-Tropsch wax are melted to obtain liquid Fischer-Tropsch wax;

(2) Adding 5 parts by weight of zinc stearate, heating, and stirring at 160 ℃ and stirring speed of 15r/min until the zinc stearate is melted to obtain a zinc stearate Fischer-Tropsch wax mixture;

(3) Adding 10 parts by weight of polyethylene wax and 5 parts by weight of No. 80 microcrystalline wax, and stirring at 160 ℃ at a stirring speed of 10r/min until the polyethylene wax and the microcrystalline wax are melted to obtain liquid mixed wax;

(4) After the liquid mixed wax is completely melted at 140 ℃, the liquid Fischer-Tropsch modified wax is obtained by heat preservation and stirring for 4 hours at 160 ℃ and a stirring speed of 20 r/min;

The preparation method of the cobalt-based refined Fischer-Tropsch wax comprises the following steps: under 280 ℃ and under the feeding condition of 500 hydrogen-oil ratio, the pressure is controlled to be 6.5MPa, and the wax oil airspeed is 1.0h ^-1 Cobalt-based refined Fischer-Tropsch wax is obtained by an FH-40 catalyst. The cobalt-based refined Fischer-Tropsch wax comprises a component with carbon distribution number of C _40- C ₁₀₀ Alkane, the normal alkane content is 98.8 weight percent based on the total weight of the cobalt-based refined Fischer-Tropsch wax, wherein the cobalt-based refined Fischer-Tropsch wax C ₁₀ -C ₆₀ The n-alkane content of (C) was 31% by weight ₆₁ -C ₈₀ The n-alkane content of (C) was 40% by weight ₈₁ The normal paraffin content was 27.8 wt%. The distillation range of the cobalt-based refined Fischer-Tropsch wax is 480-650 ℃, the wax content of the distillation range of 500-650 ℃ accounts for 80% of the total weight of the cobalt-based refined Fischer-Tropsch wax, and the wax content of the distillation range of 550-650 ℃ accounts for 72% of the total weight of the cobalt-based refined Fischer-Tropsch wax. The cobalt-based refined Fischer-Tropsch wax had a drop melting point of 100.2℃and an aromatic hydrocarbon content of 45ppm by mass.

The preparation method of the cobalt-based hydrogenated Fischer-Tropsch wax comprises the following steps: feeding No. 110 cobalt-based Fischer-Tropsch wax at 320 ℃ for 1h at 6.5MPa with 600 hydrogen-oil ratio ^-1 Under the reaction conditions of cracking and isomerism composite catalyst (SLD-821 and FC-32 catalyst weight ratio is 1:1.6) to obtain cobalt-based hydrogenated Fischer-Tropsch wax. Properties of cobalt-based hydrogenated Fischer-Tropsch waxes such asTable 1 shows the results.

Example 5

A coating wax was prepared as in example 4, except that:

the cobalt-based refined Fischer-Tropsch wax is 70 parts by weight, the cobalt-based hydrogenated Fischer-Tropsch wax is 5 parts by weight, the zinc stearate is 10 parts by weight, the polyethylene wax is 5 parts by weight, and the No. 80 microcrystalline wax is 10 parts by weight.

And wherein the preparation method of the cobalt-based refined Fischer-Tropsch wax comprises the following steps: 100 # cobalt-based Fischer-Tropsch wax is subjected to a wax oil airspeed of 1.3h at 260 ℃ under 6MPa ^-1 Under the feeding condition of hydrogen-oil ratio of 500, cobalt-based refined Fischer-Tropsch wax is obtained through FH-40 catalyst. The cobalt-based refined Fischer-Tropsch wax comprises a component with carbon distribution number of C _40- C ₁₀₀ Alkane, the normal alkane content is 98.2 weight percent based on the total weight of the cobalt-based refined Fischer-Tropsch wax, wherein the cobalt-based refined Fischer-Tropsch wax C ₁₀ -C ₆₀ The n-alkane content of (C) was 32% by weight ₆₁ -C ₈₀ The normal alkane content of (C) was 39% by weight ₈₁ The above normal alkane content was 27.2 wt%. The distillation range of the cobalt-based refined Fischer-Tropsch wax is 480-650 ℃, the wax content of the distillation range of 500-650 ℃ accounts for 84% of the total weight of the cobalt-based refined Fischer-Tropsch wax, and the wax content of the distillation range of 550-650 ℃ accounts for 72% of the total weight of the cobalt-based refined Fischer-Tropsch wax. The cobalt-based refined Fischer-Tropsch wax had a drop melting point of 100.5℃and an aromatic hydrocarbon content of 45ppm by mass.

The preparation method of the cobalt-based hydrogenated Fischer-Tropsch wax comprises the following steps: feeding No. 120 cobalt-based Fischer-Tropsch wax at 330 ℃, 6.8MPa, 500 hydrogen-oil ratio and feeding airspeed of the cobalt-based Fischer-Tropsch wax for 1.2h ^-1 The reaction is carried out under the reaction condition of cracking and isomerism composite catalyst (SLD-821 and FC-32 catalyst weight ratio is 1:1) to obtain the hydrogenated Fischer-Tropsch wax. The properties of the cobalt-based hydrogenated Fischer-Tropsch wax are shown in Table 1.

Example 6

A coating wax was prepared as in example 4, except that:

the cobalt-based refined Fischer-Tropsch wax is used in an amount of 50 parts by weight, the cobalt-based hydrogenated Fischer-Tropsch wax is used in an amount of 20 parts by weight, the zinc stearate is used in an amount of 4 parts by weight, the polyethylene wax is used in an amount of 10 parts by weight, and the No. 80 microcrystalline wax is used in an amount of 16 parts by weight.

And wherein the preparation method of the cobalt-based refined Fischer-Tropsch wax comprises the following steps: 115 # cobalt-based Fischer-Tropsch wax is subjected to a wax oil airspeed of 1.5h at 230 ℃ under 6.5MPa ^-1 Under the feeding condition of hydrogen-oil ratio 600, cobalt-based refined Fischer-Tropsch wax is obtained through FH-40 catalyst. The components of the prepared cobalt-based refined Fischer-Tropsch wax are C ₂₀ -C ₁₀₀ Alkane, the normal alkane content is 98.9 weight percent based on the total weight of the cobalt-based refined Fischer-Tropsch wax, wherein the cobalt-based refined Fischer-Tropsch wax C ₁₀ -C ₆₀ The n-alkane content of (C) was 24% by weight ₆₁ -C ₈₀ The n-alkane content of (C) was 32.5% by weight ₈₁ The above normal paraffins account for 42.4 wt.%. The distillation range of the cobalt-based refined Fischer-Tropsch wax is 480-650 ℃, the wax content of the distillation range of 500-650 ℃ accounts for 90% of the total weight of the cobalt-based refined Fischer-Tropsch wax, and the wax content of the distillation range of 550-650 ℃ accounts for 85% of the total weight of the cobalt-based refined Fischer-Tropsch wax. The cobalt-based refined Fischer-Tropsch wax had a drop melting point of 114.5℃and an aromatic hydrocarbon content of 35ppm by mass.

The preparation method of the cobalt-based hydrogenated Fischer-Tropsch wax comprises the following steps: feeding No. 120 cobalt-based Fischer-Tropsch wax at 350 ℃, 7MPa, hydrogen-oil ratio 600 and feeding airspeed of the cobalt-based Fischer-Tropsch wax for 1.2h ^-1 Under the reaction conditions of cracking and isomerism composite catalyst (0.1% Pt/SAPO-11 and FC-32 catalyst weight ratio is 1.5:1) to obtain cobalt-based hydrogenated Fischer-Tropsch wax. The properties of the cobalt-based hydrogenated Fischer-Tropsch wax are shown in Table 1.

Comparative example 1

A coating wax was prepared as in example 1, except that: no cobalt based hydrogenated fischer-tropsch wax was added.

Comparative example 2

A coating wax was prepared as in example 1, except that: no cobalt based refined fischer-tropsch wax was added.

Comparative example 3

A coating wax was prepared as in example 1, except that: no polyethylene wax was added.

Comparative example 4

PE wax is prepared according to the raw materials and the preparation method of the application CN 103305584A.

The PE wax was subjected to performance testing, and the test results are shown in Table 2.

Comparative example 5

Conventional polyethylene waxes. Polyethylene wax (available from Nanjing Tianshi under the trade designation PEW-0300, average molecular weight 15000 g/mol) was subjected to performance testing, and the test results are shown in Table 2.

Comparative example 6

A coating wax was prepared as in example 1, except that: in the preparation of cobalt-based hydrogenated Fischer-Tropsch wax, the hydrocracking catalyst (i.e., FC-32 catalyst) was used in its entirety, with no hydroisomerization catalyst (i.e., SLD-821 catalyst) added.

TABLE 1

Examples	1	2	3	4	5	6
							Average molecular weight (g/mol)	1200	1300	2000	1600	2500	2000
Drop melting point (. Degree. C.)	70	80	100	90	90	80
							Carbon number distribution	C ₁₀ -C ₈₀	C ₂₀ -C ₉₀	C ₂₀ -C ₁₂₀	C ₂₀ -C ₁₀₀	C ₂₀ -C ₉₀	C ₁₀ -C ₉₀
Oil content (wt%)	0.5	0.4	0.2	0.2	0.3	0.4
							Penetration (0.1 mm)	12	8	7	8	7	10
Shrinkage (%)	0.8	0.6	0.5	0.5	0.6	0.7
							Kinematic viscosity at 100 ℃ (mm/s)	11	14	12	18	19	16

TABLE 2

As can be seen from the results of Table 2, the examples of the wax for coating according to the present invention have a strong gloss, a strong hardness, and a high impact resistance and adhesion, and have a low viscosity, ash content, oil content, and shrinkage, as compared with the comparative examples, and the coating using the wax for coating according to the present invention has a good temperature resistance and abrasion resistance, and is suitable for preparing both an inner lubricant for a precision instrument and an outer lubricant for a precision instrument.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.

Claims

1. A wax composition for a coating, the wax composition comprising: cobalt-based refined Fischer-Tropsch wax, cobalt-based hydrogenated Fischer-Tropsch wax, high molecular polymer wax, microcrystalline wax and metal stearate;

2. The wax composition of claim 1, wherein the cobalt-based refined fischer-tropsch wax is present in an amount of 20 to 80 wt%, the cobalt-based hydrogenated fischer-tropsch wax is present in an amount of 5 to 30 wt%, the polymeric wax is present in an amount of 0.5 to 30 wt%, the microcrystalline wax is present in an amount of 3 to 20 wt%, and the metal stearate is present in an amount of 1.5 to 20 wt%, based on the total amount of the wax composition;

Preferably, the cobalt-based refined Fischer-Tropsch wax is used in an amount of 40 to 75 weight percent, the cobalt-based hydrogenated Fischer-Tropsch wax is used in an amount of 10 to 20 weight percent, the polymeric wax is used in an amount of 6 to 25 weight percent, the microcrystalline wax is used in an amount of 6 to 15 weight percent, and the metal stearate is used in an amount of 3 to 20 weight percent, based on the total weight of the wax composition;

preferably, the average molecular weight of the high molecular polymer wax is 10000-25000g/mol;

preferably, the high molecular polymer wax is at least one of polyethylene wax, polypropylene wax and polytetrafluoroethylene wax;

preferably, the microcrystalline wax is at least one of a No. 70 microcrystalline wax and a No. 80 microcrystalline wax;

preferably, the metal stearate is at least one of zinc stearate and calcium stearate.

3. Wax composition according to claim 1 or 2, wherein the cobalt-based refined fischer-tropsch wax has a drop melting point of 90-115 ℃ and a carbon number distribution of C ₁₀ -C ₁₄₀ The aromatic hydrocarbon content is 30-100ppm by mass;

preferably, the cobalt-based refined Fischer-Tropsch wax has an n-alkane content of 95 wt% or more based on the total weight of the cobalt-based refined Fischer-Tropsch wax, wherein C in the cobalt-based refined Fischer-Tropsch wax ₁₀ -C ₆₀ The content of n-alkane is 24-37 wt%, C ₆₁ -C ₈₀ The content of normal alkane is 32.5-41.5 wt%, C ₈₁ The content of the n-alkane is 25-42.4 wt%;

preferably, the distillation range of the cobalt-based refined Fischer-Tropsch wax is 400-650 ℃, wherein the wax with the distillation range of 550-650 ℃ accounts for more than 45 weight percent of the total weight of the cobalt-based refined Fischer-Tropsch wax;

preferably, the cobalt-based hydrogenated Fischer-Tropsch wax has a drop melting point of 70-100 ℃, a kinematic viscosity of 11-30mm/s at 100 ℃ and a carbon number distribution of C ₁₀ -C ₁₂₀ Penetration is 7-30 (0.1 mm) and oil content is 0.01-5 wt%;

preferably, the cobalt-based hydrogenated Fischer-Tropsch wax has a carbon number distribution of C ₂₅ -C ₁₂₀ 。

4. A wax composition according to any of claims 1-3, wherein the wax composition further comprises an adjuvant; preferably, the auxiliary agent is at least one selected from beeswax, PE oligomer, pentaerythritol stearate, ethylene bis-stearamide, emulsifying agent and antirust agent;

preferably, the amount of beeswax is 0.2 to 5 wt%, the amount of PE oligomer is 1 to 10 wt%, the amount of pentaerythritol stearate is 3 to 15 wt%, the amount of ethylene bis-stearamide is 2 to 20 wt%, the amount of emulsifier is 1 to 5 wt%, and the amount of rust inhibitor is 0.5 to 5 wt%, based on the total weight of the wax composition;

Preferably, the PE oligomer has an average molecular weight of 7000 to 9000g/mol;

preferably, the mass ratio of the high molecular polymer wax to the PE oligomer is 0.2-2:1.

Preferably, the rust inhibitor is at least one of triethanolamine, benzotriazole and pentaerythritol monooleate;

preferably, the wax composition further comprises a dispersant in an amount of 0.1 to 2 wt%, based on the total weight of the wax composition.

5. A method for preparing a wax for paint using the wax composition as claimed in any one of claims 1 to 4, comprising the steps of:

6. The method for producing a wax for paint according to claim 5, wherein in the step (1), the temperature of the first mixed melt is 120 to 180 ℃, and the stirring speed of the first mixed melt is 10 to 50r/min;

preferably, in the step (2), the second mixed melting temperature is 140-180 ℃, and the stirring speed is 10-50r/min;

preferably, in the step (3), the temperature of the third mixed melting is 140-180 ℃, and the stirring speed of the third mixed melting is 10-50r/min;

preferably, in the step (4), the melting temperature is 120-140 ℃, the heat preservation temperature is 150-175 ℃, the stirring speed during heat preservation is 10-50r/min, and the heat preservation time is 1-6h.

7. A coating wax made by the method of claim 5 or 6.

8. The coating wax according to claim 7, wherein the coating wax has a viscosity of less than 20mm/s at 100 ℃, an ash content of less than 0.05 wt%, an oil content of less than 1.3 wt%, and a shrinkage of less than 1%;

preferably, the oil content of the coating wax is 0.6 to 1.2 wt%, the shrinkage is 0.1 to 0.8 wt%, and the ash content is 0.002 to 0.005 wt%.

9. A coating material comprising the wax for coating material according to claim 7 or 8.

10. Use of the coating wax of claim 7 or 8 or the coating of claim 9 in precision instrument coatings.