CN117802490A - Alkaline water-free surface treatment agent - Google Patents
Alkaline water-free surface treatment agent Download PDFInfo
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- CN117802490A CN117802490A CN202311847275.4A CN202311847275A CN117802490A CN 117802490 A CN117802490 A CN 117802490A CN 202311847275 A CN202311847275 A CN 202311847275A CN 117802490 A CN117802490 A CN 117802490A
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- surface treatment
- alkaline water
- free surface
- treatment agent
- coating
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- 239000012756 surface treatment agent Substances 0.000 title claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000008367 deionised water Substances 0.000 claims abstract description 19
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 19
- VAQFOQOMOXWCFF-UHFFFAOYSA-N 3-[4-(6-azaniumylhexanoyloxy)phenyl]propanoate Chemical compound [NH3+]CCCCCC(=O)OC1=CC=C(CCC([O-])=O)C=C1 VAQFOQOMOXWCFF-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 9
- 239000003899 bactericide agent Substances 0.000 claims abstract description 9
- -1 alcohol amine Chemical class 0.000 claims abstract description 7
- 239000006184 cosolvent Substances 0.000 claims abstract description 6
- 239000012224 working solution Substances 0.000 claims description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical group NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 29
- 238000000576 coating method Methods 0.000 abstract description 29
- 239000002184 metal Substances 0.000 abstract description 24
- 239000000758 substrate Substances 0.000 abstract description 10
- 239000000843 powder Substances 0.000 abstract description 7
- 238000004381 surface treatment Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 5
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 abstract description 3
- 239000004593 Epoxy Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 238000002360 preparation method Methods 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 241000282376 Panthera tigris Species 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XIXODSJTLXWRFP-UHFFFAOYSA-N 3-[4-(6-aminohexanoyl)phenyl]propanoic acid Chemical compound NCCCCCC(=O)C1=CC=C(CCC(O)=O)C=C1 XIXODSJTLXWRFP-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 101001084254 Homo sapiens Peptidyl-tRNA hydrolase 2, mitochondrial Proteins 0.000 description 1
- OUYCCCASQSFEME-QMMMGPOBSA-N L-tyrosine Chemical compound OC(=O)[C@@H](N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-QMMMGPOBSA-N 0.000 description 1
- 102100030867 Peptidyl-tRNA hydrolase 2, mitochondrial Human genes 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention discloses an alkaline water-free surface treatment agent, which comprises the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, 6-8% of cosolvent, 5-8% of alcohol amine, 1% of bactericide and the balance of deionized water. The surface treating agent forms a film on the surface of a metal workpiece by using a covalent-like bond, realizes the bridging effect in the surface treatment technology before coating, can firmly combine with a metal substrate by adopting the covalent-like bond structure, and can crosslink an amino functional group contained in the surface treating agent with an epoxy functional group in the powder coating, so that the bonding force between the coating and the metal substrate is effectively improved.
Description
Technical Field
The invention relates to an alkaline water-free surface treating agent.
Technical Field
In the manufacturing industry, metal parts often require surface treatment followed by powder coating to achieve the desired appearance and high corrosion resistance. The existing surface treatment technology is a ceramic technology, but the use liquid is acidic, so that rust return of a metal piece is easy to occur in the use process, and the coating quality is reduced; meanwhile, the ceramic technology requires more treatment stations (because the ceramic treatment requires rinsing with clear water to ensure the coating quality), and is usually 7 stations. To address the need for fewer equipment stations (typically 4 stations) required by the user, many water-free silane-based surface treatment products have been produced. After the products are treated, the products can be directly dried and then are subjected to powder spraying without rinsing with clear water, so that the number of required stations is reduced; meanwhile, as the product is alkaline, the rust returning condition of the metal piece in the production process can be effectively avoided.
In the surface treatment process before coating, a film layer needs to be formed between the metal and the coating, on one hand, a firm film layer is formed between the metal and the surface of the metal, and on the other hand, strong combination is formed between the metal and the coating, so that the purposes of high adhesive force and corrosion resistance of the coated coating are finally achieved. The existing water-free silane products are mechanisms for forming a film layer on the surface of a metal by utilizing silicon hydroxyl generated after the hydrolysis of a silane coupling agent. However, the silicon hydroxyl generated by the hydrolysis of the silane coupling agent is combined with the film layer formed on the metal surface by virtue of hydrogen bonds, so that the bonding force is weak, and the film layer is easy to peel after coating, thereby finally influencing the coating quality.
Disclosure of Invention
The invention aims to: the invention aims to provide an alkaline water-free surface treating agent, which can form a film layer on the surface of a metal substrate after being treated by the surface treating agent, and the film layer can effectively promote the binding force between a coating and the metal substrate.
The technical scheme is as follows: the alkaline water-free surface treatment agent disclosed by the invention comprises the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid (commercial model: CAS 760127-60-4), 6-8% of cosolvent, 5-8% of alcohol amine, 1% of bactericide and the balance of deionized water.
Wherein, 3-(4- (6-aminohexanoyloxy) phenyl) propionic acid has the structural formula:
the film forming mechanism of the surface treating agent is a film layer which is formed by carboxyl and a large pi bond of benzene ring in 3- (4- (6-aminocaproyloxy) phenyl) propionic acid and forms a covalent bond with the metal surface, and simultaneously, the amino at the other end of the surface treating agent and epoxy groups in the coating are subjected to crosslinking reaction, and the film layer can be used as a transition layer to effectively firmly combine the metal substrate and the coating together.
Wherein the cosolvent is ethanol or butyl ether.
Wherein the alcohol amine is monoethanolamine or triethanolamine; the addition of the alcohol amine can play a role in helping dissolution on the one hand and can be used for adjusting the pH value of the treating agent on the other hand.
Wherein, the bactericide is non-formaldehyde release bactericides BIT or BBIT, and the addition of the bactericides can ensure that the treating agent can avoid bacteria breeding in the use process.
Wherein, the surface treating agent is prepared into working solution with the mass fraction of 5-6% by using deionized water.
Wherein the pH of the working solution is 9.0-9.7.
The preparation method of the alkaline water-free surface treating agent specifically comprises the following steps: adding 3- (4- (6-amino caproyl) phenyl) propionic acid with a formula amount into a cosolvent, and stirring for at least 10min; adding deionized water with the formula amount into the mixture, and stirring the mixture for at least 5 minutes; adding alcohol amine with the formula amount, and stirring for at least 10min; and finally adding the bactericide with the formula amount, and stirring for at least 10 min.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable progress: the surface treating agent can be used for directly drying and then carrying out powder spraying after the metal workpiece is treated by the surface treating agent without rinsing with clear water, so that the number of required stations is reduced; meanwhile, as the surface treating agent is alkaline, the condition that the metal workpiece is rusted back in the production process can be effectively avoided; in addition, the surface treating agent forms a film on the surface of a metal workpiece by using a covalent-like bond, so that the bridging effect in the surface treating technology before coating is realized, on one hand, the covalent-like bond structure can be firmly combined with a metal substrate, and on the other hand, the amino functional group contained in the surface treating agent can be crosslinked with the epoxy functional group in the powder coating, so that the binding force (long-term adhesive force) between the coating and the metal substrate is effectively improved, and the longer the salt spray resistance time is, the better the long-term adhesive force between the coating and the metal substrate is.
Detailed Description
Example 1
The alkaline water-free surface treating agent consists of the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, 8% of ethanol (purity 99%), 8% of monoethanolamine, 1% of BIT and 73% of deionized water.
After the preparation is completed, deionized water is used for preparing 5% of working solution, and the pH of the working solution is 9.7.
Example 2
The alkaline water-free surface treating agent consists of the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, 8% of ethanol (purity 99%), 5% of triethanolamine, 1% of BBIT and 76% of deionized water.
After the preparation is completed, deionized water is used for preparing 5% of working solution, and the pH value of the working solution is 9.0.
Example 3
The alkaline water-free surface treating agent consists of the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, 6% of butyl ether (purity 99%), 5% of triethanolamine, 1% of BBIT and 78% of deionized water.
After the preparation is completed, deionized water is used for preparing 5% of working solution, and the pH value of the working solution is 9.0.
Comparative example 1
The surface treating agent consists of the following components in percentage by mass: tyrosine 10%, ethanol (99% purity) 8%, monoethanolamine 8%, BIT1% and deionized water 73%.
After the preparation is completed, deionized water is used for preparing 5% of working solution, and the pH of the working solution is 9.7.
Comparative example 2
The surface treating agent consists of the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, 8% of propanol, 8% of monoethanolamine, 1% of BIT and 73% of deionized water.
After the preparation is completed, deionized water is used for preparing 5% of working solution, and the pH of the working solution is 9.7.
Comparative example 3
The surface treating agent consists of the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, 8% of ethanol (purity 99%), 0.5% of KOH, 1% of BIT and 81.5% of deionized water.
After the preparation is completed, deionized water is used for preparing 5% of working solution, and the pH of the working solution is 9.7.
The process of making the board is as follows: a commercial Q235 cold-rolled steel plate (produced by Shanghai Bao Steel) with the specification of (170 mm multiplied by 100mm multiplied by 0.8 mm) is adopted as a test sample plate of the embodiment of the invention; seven steel plates are firstly soaked and cleaned for about 6min by using alkaline cleaning agents (50 ℃) which are commonly used in the market, and then rinsed for about 30 seconds by flowing tap water after being taken out. The test board for comparison is hung at room temperature for 1min, the dried sample board is put into a baking oven at 120 ℃ for 10min, then the sample board is sprayed with tiger powder and cured for 20min at 180 ℃, and the thickness of the coating is controlled between 40 and 50 mu m. The rest six rinsed test templates are immediately placed in working solutions prepared by the surface treatment agents of the examples 1-3 and the comparative examples 1-3 respectively for 5min, taken out, immediately rinsed by deionized water for about 30 seconds, and then hung and placed at room temperature for 1min; and (3) putting the dried test sample plate into a baking oven at 120 ℃ for drying for 10min, then spraying tiger powder, and curing for 20min at 180 ℃ to control the thickness of the coating to be 40-50 mu m.
The coating adhesion (see standard GB 9286-2021) and neutral salt spray resistance (see standard GBT 1771-2007) of seven steel plates were tested and the test results are shown in Table 1. According to the technical requirements of industry, the adhesive force measured immediately after the coating is coated is 0 grade, the coating is qualified, and the neutral salt spray resistance test uses the time that the single side etching width at the scribing position is less than or equal to 2mm as a judging standard.
TABLE 1
| Testing performance index | Comparative example | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Adhesion force | Level 0 | Level 0 | Level 0 | Level 0 | Level 0 | Level 0 | Level 0 |
| Neutral salt fog resistance for hours | 236 | 384 | 360 | 336 | 268 | 294 | 248 |
As can be seen from the comparison of the data in Table 1, the short-term adhesion test of all the test panels can reach the standard (grade 0), but the results of the neutral salt spray resistance test of the test panels of the control example without surface treatment are worst, which indicates that the surface treatment is required before the coating to improve the binding force between the coating and the metal substrate. As can be seen from comparison of the examples 1 and 2, the higher pH value is beneficial to improving the flash rust resistance of the film before drying, and finally improving the corrosion resistance of the coating; as can be seen from comparison of the example 2 and the example 3, the use of different auxiliary agents has different dispersing and film forming effects on the film forming main agent 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, and the better auxiliary agent can better exert the film forming quality of the film forming main agent to a certain extent so as to improve the salt spray resistance of the coated film layer.
As can be seen from the comparison of the example 1 and the comparative example 1, even though the different film forming main agents are similar in structure, such as most amino acids, the amino groups and the carboxyl groups exist, but the molecular chains are shorter, so that the film forming main agents can show weak adsorption capacity and film forming quality, and finally the difference of the corrosion resistance of the coating is larger; as is clear from comparison between the example 1 and the comparative example 2, the auxiliary agent has different dispersing ability on the film-forming main agent, and weaker dispersing can show that the film-forming quality of the film-forming main agent is greatly affected; as is evident from the comparison of example 1 and comparative example 3, the adjustment of pH with inorganic compounds tends to form more residues on the surface of the metal substrate, thereby adversely affecting the long-term corrosion resistance of the subsequent coating.
Claims (7)
1. An alkaline water-free surface treatment agent is characterized by comprising the following components in percentage by mass: 10% of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid, 6-8% of cosolvent, 5-8% of alcohol amine, 1% of bactericide and the balance of deionized water.
2. The alkaline water-free surface treatment agent according to claim 1, characterized in that: the structural formula of 3- (4- (6-aminocaproyloxy) phenyl) propionic acid is:
3. the alkaline water-free surface treatment agent according to claim 1, characterized in that: the cosolvent is ethanol or butyl ether.
4. The alkaline water-free surface treatment agent according to claim 1, characterized in that: the alcohol amine is monoethanolamine or triethanolamine.
5. The alkaline water-free surface treatment agent according to claim 1, characterized in that: the bactericide is formaldehyde-free release type bactericide BIT20 or BBIT.
6. The alkaline water-free surface treatment agent according to claim 1, characterized in that: the surface treating agent is prepared into working solution with mass fraction of 5-6% by deionized water.
7. The alkaline water-free surface treatment agent according to claim 6, characterized in that: the pH of the working solution is 9.0-9.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311847275.4A CN117802490A (en) | 2023-12-29 | 2023-12-29 | Alkaline water-free surface treatment agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311847275.4A CN117802490A (en) | 2023-12-29 | 2023-12-29 | Alkaline water-free surface treatment agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117802490A true CN117802490A (en) | 2024-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311847275.4A Pending CN117802490A (en) | 2023-12-29 | 2023-12-29 | Alkaline water-free surface treatment agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117802490A (en) |
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2023
- 2023-12-29 CN CN202311847275.4A patent/CN117802490A/en active Pending
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