Stainless steel polishing wax and preparation method thereof

Abstract

The invention relates to the technical field of stainless steel surface polishing, in particular to stainless steel polishing wax and a preparation method thereof.The stainless steel polishing wax is prepared from, by weight, 23%-27% of grinding materials, 13%-17% of paraffin, 2%-5% of castor oil, 6%-10% of amino-terminated hyperbranched polyamide, 1%-3% of small molecule amine, 3%-6% of poloxamer and 2%-4% of anionic surfactant. And the balance of water. The method has the advantage of further reducing the surface roughness of the stainless steel product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing of stainless steel surfaces, and in particular to a stainless steel polishing wax and a preparation method thereof. BACKGROUND

[0002] Stainless steel has excellent corrosion resistance and is widely used in medical devices, household appliances, and industries. As the application field continues to expand, people's requirements for the surface finish of stainless steel products are becoming higher and higher. In order to ensure that the surface of the stainless steel product is scratch-free and has high gloss, and to improve corrosion resistance, the stainless steel product needs to undergo multiple polishing processes.

[0003] The existing polishing is a method of processing materials using mechanical, chemical or electrochemical methods, and has obtained a stainless steel product with a bright and smooth surface. Among them, mechanical polishing is the most widely used. In mechanical polishing, polishing wax is used as a polishing medium. However, the liquid polishing wax on the market generally has insufficient wetting properties on the surface of the stainless steel product, resulting in a large surface roughness of the polished stainless steel product, which cannot meet the application of some precision instruments and reduces the application potential. SUMMARY

[0004] In order to further reduce the surface roughness of the stainless steel product, the present application provides a stainless steel polishing wax and a preparation method thereof.

[0005] In a first aspect, the present application provides a stainless steel polishing wax, which adopts the following technical solution: A stainless steel polishing wax, comprising the following raw materials by weight percentage: abrasive 23-27%, paraffin wax 13-17%, castor oil 2-5%, amino-terminated hyperbranched polyamide 6-10%, small molecule amine 1-3%, poloxamer 3-6%, anionic surfactant 2-4%, and the balance being water.

[0006] By adopting the technical scheme, the castor oil is added, the main component of the castor oil is glyceryl ricinoleate, the castor oil contains a hydrophobic part of a long-chain hydroxyl and a hydrophilic group of a hydroxyl, and also contains an unsaturated structure of a double bond, the cis-double bond in the castor oil molecule makes the molecular chain have a certain bending degree (rather than being completely straightened), and the flexible structure enables the castor oil to adjust the molecular orientation when contacting the surface of the stainless steel: the hydrophobic hydrocarbon group tends to insert into the wax base, and the hydrophilic hydroxyl group faces the surface of the stainless steel to form a "directional arrangement", thereby greatly improving the wettability between the polishing wax and the stainless steel; on this basis, the high-branched structure of the amino-terminated hyperbranched polyamide provides a large number of amino reaction sites, and the small molecule amine can be coordinated with iron on the surface of the stainless steel to form a loose complex film, which can improve the cutting efficiency and also improve the adhesion of the polishing wax, so that the wax layer is not easy to fall off during the polishing process, the abrasive continuously contacts the cutting, thereby realizing uniform polishing of the surface of the workpiece, and the film formation can also protect the surface of the workpiece, avoid local over-polishing, and reduce the surface roughness.

[0007] Preferably, the relative molecular weight of the amino-terminated hyperbranched polyamide ranges from 350 to 2200.

[0008] By adopting the technical scheme, the amino-terminated hyperbranched polyamide with the molecular weight in the range has a high-branched structure, and the terminal amino group is chelated with metal ions to form a micro-etching structure on the surface of the stainless steel, thereby improving the polishing efficiency.

[0009] Preferably, the small molecule amine is one or both of diethylenetriamine and triethylenetetramine.

[0010] By adopting the technical scheme, the linear structure contains multiple amino groups, and the amino group density is higher, so that the surface reaction sites are increased in cooperation with the HBP-NH2, the complexation is strengthened, and the micro-etching uniformity and the polishing rate are further improved. Preferably, the addition amount of the amino-terminated hyperbranched polyamide is 8%.

[0011] By adopting the technical scheme, the addition amount can make the performance of polishing be relatively optimal.

[0012] Preferably, the molecular weight of the poloxamer ranges from 2000 to 8350.

[0013] By adopting the technical scheme, the poloxamer can improve the stability and dispersibility of the abrasive, but the viscosity is also improved as the molecular weight increases, and in this molecular weight range, the poloxamer can play a good dispersion role and also make the flowability of the polishing wax be good, thereby being convenient for practical application.

[0014] As preferred: the anionic surfactant is one or more of sodium dodecyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside sulfate, and sodium dioctyl sulfosuccinate.

[0015] As preferred: the abrasive is one or both of silicon carbide and alpha-alumina, and the particle size of the abrasive is 200-300 nm.

[0016] In a second aspect, the application provides a preparation method of a stainless steel polishing wax, which adopts the following technical scheme: A preparation method of a stainless steel polishing wax, which comprises the following steps: S1. Stir and mix paraffin wax, castor oil, amino-terminated hyperbranched polyamide, and small molecule amine at 65-80 DEG C to obtain a mixture A; S2. At 65-80 DEG C, add poloxamer, anionic surfactant to water, then stir until dissolved, and then add abrasive, disperse at high speed, and stir at a speed of 3000-4000 r / min to obtain a mixture B; S3. At 65-80 DEG C, add the mixture B to the mixture A in portions, and after the addition is completed, the temperature is no longer maintained, and after cooling, stir at a speed of 3500-4500 r / min for 20-40 min to obtain the stainless steel polishing wax.

[0017] By adopting the above technical scheme, the paraffin wax is melted at 65-80 DEG C, which facilitates uniform mixing with the castor oil, the amino-terminated hyperbranched polyamide, and the small molecule amine to form a uniform liquid mixture, ensuring the uniformity of the subsequent wax-based film formation; the water, the poloxamer, and the anionic surfactant are dissolved at 65-80 DEG C, and the nanometer abrasive is uniformly dispersed in the micelles by high-speed dispersion (3000-4000 r / min) to form a stable suspension, avoiding the agglomeration of the abrasive; after the mixture B is added to the mixture A and cooled, the wax base gradually solidifies to wrap the abrasive micelles, and at the same time, the amino-terminated hyperbranched polyamide and the small molecule amine have completed the complexation reaction with the stainless steel surface before solidification, ensuring that the abrasive and the chemical action take effect simultaneously during polishing, improving the cutting efficiency and the surface quality.

[0018] In summary, the application has at least one of the following beneficial technical effects: 1、The application adds castor oil, the main component of castor oil is glyceryl ricinoleate, contains a long-chain hydroxyl hydrophobic part and a hydrophilic group of hydroxyl, also contains an unsaturated structure of double bond, the cis double bond in the castor oil molecule (makes the molecular chain have a certain bending degree (not completely straight), this flexible structure enables it to adjust the molecular orientation when contacting the stainless steel surface: the hydrophobic hydrocarbon group tends to insert into the wax base, while the hydrophilic hydroxyl group faces the stainless steel surface, forming a "directional arrangement", thereby greatly improving the wettability between the polishing wax and the stainless steel; on this basis, the high-branched structure of the amino-terminated hyperbranched polyamide provides a large number of amino reaction sites, which can coordinate with iron on the surface of the stainless steel with small molecule amines to form a loose complex film, which can improve the cutting efficiency and also improve the adhesion of the polishing wax, so that the wax layer is not easy to fall off during polishing, the abrasive continuously contacts the cutting, thereby achieving uniform polishing of the workpiece surface, and the film formation can also protect the workpiece surface from local over-polishing and reduce the surface roughness.

[0019] 2、The stainless steel polishing wax prepared by the application can reach a surface roughness of 0.008 μm or less, and a minimum of 0.004 μm, and the surface gloss can reach level 5; and after finishing, it can be cleaned well; the detection data show that the stainless steel polishing wax of the application can further reduce the roughness of the stainless steel workpiece surface and has stable performance. DETAILED DESCRIPTION

[0020] The application will be further described in detail below in combination with specific content.

[0021] Raw materials The paraffin wax is purchased from Maoming Petrochemical Company, model 54#, industrial grade; the castor oil is purchased from Jinan Hongtu Chemical Co., Ltd., industrial grade; the amino-terminated hyperbranched polyamide is purchased from Wuhan Hyperbranched Resin Technology Co., Ltd.; and the poloxamer is purchased from Haian Petrochemical Factory in Jiangsu Province. Examples

[0022] Example 1 A stainless steel polishing wax, the raw materials and the amounts of the raw materials are shown in Table 1, and the preparation method is as follows: S1, at 70°C, the paraffin wax, castor oil, amino-terminated hyperbranched polyamide and triethylenetetramine are stirred and mixed to obtain a mixture A; wherein the molecular weight of the amino-terminated hyperbranched polyamide is 800-1000, and the corresponding model is HyPer N102; S2, at 70°C, poloxamer, sodium dodecyl sulfate is added in water, then stirred to dissolve, then add abrasive, high speed dispersion, stirring speed is 3500r / min, mixture B is prepared; wherein, the abrasive is 200-300nm of silicon carbide; the average molecular weight of poloxamer is 5000, and the corresponding model is F38; S3, at 70°C, mixture B is added into mixture A in 3 times, the interval between adjacent two batches is 20 min, after the addition, the temperature is no longer maintained, and after cooling to room temperature, stirring at 4000r / min for 30 min, a stainless steel polishing wax is prepared.

[0023] Table 1 each raw material and the amount of each raw material (kg) of example 1 abrasive 25 paraffin wax 15 castor oil 3 amino-terminated hyperbranched polyamide 8 triethylenetetramine 2 poloxamer 5 sodium dodecyl sulfate 3 water q.s. to 100 Example 2 A stainless steel polishing wax, which is different from example 1, the molecular weight of the terminal amino hyperbranched polyamide is 1900-2200, the corresponding model is HyPer N103, and the remaining steps are the same as example 1.

[0024] Example 3 A stainless steel polishing wax, which is different from example 1, the molecular weight of the terminal amino hyperbranched polyamide is 350-370, the corresponding model is HyPer N101, and the remaining steps are the same as example 1.

[0025] Example 4 A stainless steel polishing wax, which is different from example 1, the addition amount of the terminal amino hyperbranched polyamide is 6kg, and the remaining steps are the same as example 1.

[0026] Example 5 A stainless steel polishing wax, which is different from example 1, the addition amount of the terminal amino hyperbranched polyamide is 10kg, and the remaining steps are the same as example 1.

[0027] Example 6 A stainless steel polishing wax, which is different from example 1, the average molecular weight of poloxamer is 8350, the corresponding model is F68, and the remaining steps are the same as example 1.

[0028] Example 7 A stainless steel polishing wax, which is different from example 1, the average molecular weight of poloxamer added is 2000, the corresponding model is L61, and the remaining steps are the same as example 1.

[0029] Example 8 A stainless steel polishing wax, which is different from Example 1 in that the triethylenetetramine is replaced by an equal mass of diethylenetriamine, and the remaining steps are the same as those of Example 1.

[0030] Comparative Example Comparative Example 1 A stainless steel polishing wax, which is different from Example 1 in that the added castor oil is replaced by an equal mass of paraffin wax, and the remaining steps are the same as those of Example 1.

[0031] Comparative Example 2 A stainless steel polishing wax, which is different from Example 1 in that the added amino-terminated hyperbranched polyamide is replaced by an equal mass of triethylenetetramine, and the remaining steps are the same as those of Example 1.

[0032] Comparative Example 3 A stainless steel polishing wax, which is different from Example 1 in that the added poloxamer is replaced by an equal mass of sodium dodecyl sulfate, and the remaining steps are the same as those of Example 1.

[0033] Performance detection test Detection method / test method The stainless steel polishing wax was prepared according to the preparation methods of Examples 1-8 and Comparative Examples 1-3, respectively, and then detected according to the following method, and the detection results are shown in Table 2.

[0034] Surface roughness: the surface of the polished stainless steel workpiece was detected according to the detection method in GB 1031-2009; surface gloss: the brightness of the surface of the polished workpiece was divided into 5 levels by visual observation; Level 1: the surface has a white oxide film and no brightness; Level 2: slightly bright, the outline is not clear; Level 3: good brightness, the outline can be seen; Level 4: the surface is bright and the outline can be clearly seen (equivalent to the surface quality of electrochemical polishing); Level 5: mirror-like brightness.

[0035] Ease of cleaning: The workpiece after being washed and dried at 80°C for 2h was placed in a desiccator, cooled to room temperature, weighed by an analytical balance, and recorded as M0; the polishing wax was evenly applied on the surface of the workpiece, which was then placed in an oven at 150°C for aging for 45min, taken out, placed in a desiccator, cooled to room temperature, weighed, and recorded as M1; the workpiece was placed in a 5% wax removal water (commercially available metal surface polishing wax cleaning agent) solution at 70°C, ultrasonically cleaned for 10min, taken out, rinsed with tap water for 30s, then dried in an oven at 80°C for 2h, placed in a desiccator, cooled to room temperature, weighed, and recorded as M2. The wax removal efficiency η = [(M2-M0) / M1-M0)] x 100%.

[0036] η = 95-100%, no dirt, continuous surface water film, defined as excellent; η = 90-95%, no obvious dirt, discontinuous surface water film, defined as good; η = 80-90%, a small amount of dirt, defined as medium; η = 80% or less, obvious dirt, defined as poor.

[0037] The polishing experiment steps: the same batch of stainless steel workpieces (the material of the stainless steel workpieces is 304 stainless steel) after rough polishing were subjected to fine polishing, and the surface roughness of the stainless steel workpieces after rough polishing was 0.2-0.3μm; the fine polishing steps were as follows: the polishing wax was evenly applied on the surface of the stainless steel workpieces after rough polishing, and the fine polishing was performed after solidification at a temperature of 30-45°C for 2h, the cloth wheel rotation speed was 2000r / min, the pressure was 0.4kg / cm 2 , and the feed amount was 20-25mm.

[0038] Table 2: Test results of examples 1-8 and comparative examples 1-3 As can be seen from the test data of examples 1-8 and comparative examples 1-3, and table 2, the stainless steel polishing wax prepared in the application can pass the test, and the surface roughness can reach 0.008μm or less, and the minimum can reach 0.004μm, and the surface gloss can reach level 5; and after fine polishing, it can be better cleaned; the test data show that the stainless steel polishing wax of the application can further reduce the roughness of the surface of the stainless steel workpiece, and has stable performance.

[0039] By adding castor oil, the main component of castor oil is glyceryl ricinoleate, containing a hydrophobic part of long-chain hydroxyl and a hydrophilic group of hydroxyl, also containing an unsaturated structure of double bond, the cis double bond in the castor oil molecule (making the molecular chain have a certain degree of curvature (rather than completely straight), this flexible structure enables it to adjust the molecular orientation when contacting the stainless steel surface: the hydrophobic hydrocarbon group tends to insert into the wax base, while the hydrophilic hydroxyl group faces the stainless steel surface, forming a "directional arrangement", thereby greatly improving the wettability between the polishing wax and the stainless steel; On this basis, the high-branched structure of the amino-terminated hyperbranched polyamide provides a large number of amino reaction sites, which can react with small molecule amines and iron on the surface of the stainless steel to form a loose complex film, which can improve the cutting efficiency and also improve the adhesion of the polishing wax, so that the wax layer is not easy to fall off during polishing, maintaining the continuous contact of the abrasive with the cutting, thereby achieving uniform polishing of the workpiece surface, and its film formation can also protect the workpiece surface from local over-polishing, reducing the surface roughness. The detection data of Example 1 and Comparative Example 1 can be verified. In combination with Comparative Examples 2-3, poloxamer can improve the stability and dispersibility of the abrasive, and anionic surfactants can synergistically improve the stability of the abrasive, thereby improving the polishing effect.

[0040] Through Examples 1-3, the amino-terminated hyperbranched polyamide with a molecular weight range of 350-200 has a high-branched structure, and the terminal amino group is chelated with metal ions to form a micro-etching structure on the surface of the stainless steel, thereby improving the polishing efficiency. In combination with Examples 4-5, the optimal addition amount of the amino-terminated hyperbranched polyamide is 8%.

[0041] Through Examples 1 and Examples 6-7, poloxamer can improve the stability and dispersibility of the abrasive, but its molecular weight increases, and its viscosity also increases, and in the molecular weight range of 2000-8350, it can play a good dispersing effect and also make the polishing wax have good flowability, which is convenient for practical application.

[0042] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A stainless steel polishing wax, characterized in that: It comprises the following raw materials by weight percentage: 23-27% abrasive, 13-17% paraffin wax, 2-5% castor oil, 6-10% terminal amino hyperbranched polyamide, 1-3% small molecule amine, 3-6% poloxamer, 2-4% anionic surfactant, and the balance being water.

2. The stainless steel polishing wax according to claim 1, characterized in that: The relative molecular weight range of the terminal amino hyperbranched polyamide is 350-2200.

3. The stainless steel polishing wax according to claim 1, characterized in that: The small molecule amine is one or both of diethylenetriamine and triethylenetetramine.

4. The stainless steel polishing wax according to claim 1, characterized in that: The amount of the terminal amino hyperbranched polyamide added is 8%.

5. The stainless steel polishing wax according to claim 1, characterized in that: The molecular weight range of the poloxamer is 2000-8350.

6. The stainless steel polishing wax according to claim 1, characterized in that: The anionic surfactant is one or more of sodium dodecyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside sulfate, and sodium dioctyl sulfosuccinate.

7. The stainless steel polishing wax according to claim 1, characterized in that: The abrasive is one or both of silicon carbide and α-alumina, and the particle size of the abrasive is 200-300 nm.

8. A method for preparing a stainless steel polishing wax according to any one of claims 1-7, characterized in that: It includes the following steps: S1. At 65-80℃, paraffin wax, castor oil, amino-terminated hyperbranched polyamide and small molecule amine are stirred and mixed to obtain mixture A; S2. At 65-80℃, add poloxamer and anionic surfactant to water, stir until dissolved, then add abrasive and disperse at high speed with a stirring speed of 3000-4000 r / min to obtain mixture B; S3. At 65-80℃, add mixture B to mixture A in portions. After the addition is complete, the temperature is no longer maintained. After cooling, stir at 3500-4500r / min for 20-40min to obtain stainless steel polishing wax.

Images