Solvent resistant powder coating for sewing machines

Abstract

The invention discloses a special solvent-resistant powder coating for sewing machines, which is made of the following ingredients: modified epoxy resin, a first filler, a second filler, titanium dioxide, phenolic resin, a curing agent, an antioxidant, a leveling agent, and tetramethoxymethyl glycoluril; wherein the weight ratio of the first filler to the second filler is 1:2; the powder coating prepared by the invention can maintain the integrity and performance stability of the coating under the condition of long-term contact with various organic solvents, and is not prone to dissolution, bubbling, shedding and the like. After being applied to the sewing machine, it can continuously protect the sewing machine for a long time. The powder coating prepared by the invention has excellent environmental performance. Since it does not contain organic volatiles during production and use, it will not cause pollution to the environment and meets environmental protection requirements. At the same time, the powder coating prepared by the invention can be recycled and reused, thereby improving the utilization rate of the powder material.

Description

Technical Field

[0001] The invention belongs to the technical field of powder coatings, in particular to a special solvent-resistant powder coating for sewing machines. Background Art

[0002] The function of a sewing machine is to have the following functions, including: Suture function: This is the most important function of a sewing machine. It can connect various fabrics, leather and other materials together through sewing, and is used to make various textiles such as clothing, curtains, bedding, etc. Improve efficiency: Compared with manual sewing, the sewing speed of a sewing machine is much faster, which can greatly improve production efficiency, save time and labor costs, especially in large-scale production. Ensure quality: The sewing machine can make the stitches even, neat and firm, ensure the stability of sewing quality, and reduce problems such as uneven stitches and inconsistent tightness that may occur due to manual sewing. Rich sewing patterns: Modern sewing machines usually have a variety of sewing modes and pattern functions, which can sew stitches of different shapes and styles to meet different design needs.

[0003] The metal parts of sewing machines are easily corroded by oxygen, moisture and other corrosive substances in the air and rust. Coatings can form a protective film on the metal surface to prevent oxygen and moisture from contacting the metal, thereby playing a role in rust prevention and corrosion prevention, and extending the service life of the sewing machine. During the use of the sewing machine, its surface may rub against fabrics, parts, etc. Coatings can improve the hardness and wear resistance of the sewing machine surface, reduce surface damage caused by friction, and maintain the appearance and performance of the sewing machine.

[0004] Although existing solvent-based coatings can be used on sewing machines, a large amount of organic solvents are volatilized during the drying process, which not only pollutes the environment but also poses a great threat to human health.

[0005] Powder coating is a new type of solvent-free 100% solid powder coating. It is more environmentally friendly than solvent-based coatings. However, some existing powder coatings have relatively poor solvent resistance, which causes them to dissolve quickly when in contact with some solvents, destroying the coating. Summary of the invention

[0006] The purpose of the present invention is to provide a solvent-resistant powder coating for sewing machines to solve the deficiencies in the prior art.

[0007] The technical solution adopted by the present invention is as follows:

[0008] The solvent-resistant powder coating for sewing machines comprises the following ingredients by weight: 65-72 parts of modified epoxy resin, 5-6 parts of first filler, 10-12 parts of second filler, 3-5 parts of titanium dioxide, 35-38 parts of phenolic resin, 4-6 parts of curing agent, 1-1.5 parts of antioxidant, 2-3 parts of leveling agent, and 1-2 parts of tetramethoxymethyl glycoluril;

[0009] The weight ratio of the first filler to the second filler is 1:2.

[0010] As a further technical solution: the preparation method of the modified epoxy resin is:

[0011] First, the organic solvent is preheated to 35°C, and then the eucommia gum is added to the preheated organic solvent, stirred for 10 minutes, and then the system temperature is adjusted to 40°C, kept warm, and stirred for 2 hours to obtain the eucommia gum solution, which is kept warm for later use;

[0012] Among them, the stirring speed is 500r / min;

[0013] Add castor oil to the insulated eucommia gum solution prepared above, stir for 10 minutes, then adjust the system temperature to 68°C, insulate and stir for 2 hours, then adjust the temperature to 80°C, continue stirring for 4 hours to obtain a modified material solution, insulate and set aside;

[0014] Among them, the stirring speed is 350r / min;

[0015] Add epoxy resin to the heat-insulated modified material solution, stir for 1 hour, and then treat with ultrasound for 30 minutes to obtain a mixed dispersion;

[0016] Among them, the stirring speed is 650r / min;

[0017] The mixed dispersion is evaporated to recover the organic solvent, thereby obtaining a modified epoxy resin.

[0018] As a further technical solution: the organic solvent is xylene;

[0019] The mixing ratio of the eucommia gum and xylene is 12g:200mL.

[0020] As a further technical solution: the molecular weight of the eucommia gum is 160000;

[0021] The density of the eucommia gum is 0.96 g / cm³.

[0022] As a further technical solution: the castor oil and eucommia gum solution are mixed in a mass ratio of 1:5-8;

[0023] The epoxy resin is epoxy resin E51;

[0024] The epoxy resin E51 and the modified material solution are mixed in a mass ratio of 1:1;

[0025] The ultrasonic frequency is 50kHz;

[0026] Among them, the average molecular weight of epoxy resin E51 is 420;

[0027] The epoxy value of epoxy resin E51 is 0.51 mol / 100g.

[0028] As a further technical solution: the curing agent is a mixture of ethylenediamine and diethylenetriamine;

[0029] The mixing mass ratio of ethylenediamine to diethylenetriamine is 1:3.

[0030] As a further technical solution: the antioxidant is antioxidant 168.

[0031] As a further technical solution: the leveling agent is BYK-301.

[0032] As a further technical solution: the first filler is a mixture of calcium carbonate and bentonite;

[0033] Among them, the mass ratio of calcium carbonate to bentonite is 10:1.

[0034] As a further technical solution: the second filler is a mixture of nano-silicon dioxide and graphene;

[0035] The mass ratio of nano-silicon dioxide to graphene is 20:1.

[0036] The powder coating prepared by the present invention can maintain the integrity and performance stability of the coating when in contact with various organic solvents for a long time, and is not prone to dissolution, bubbling, shedding and the like. After being applied to a sewing machine, it can continuously protect the sewing machine for a long time.

[0037] The powder coating prepared by the present invention has excellent environmental performance. Since it does not contain organic volatiles during production and use, it will not cause pollution to the environment and meets environmental protection requirements. At the same time, the powder coating prepared by the present invention can be recycled and reused, thereby improving the utilization rate of powder materials.

[0038] The powder coating prepared by the invention has good adhesion, hardness, wear resistance and corrosion resistance, etc., and can provide long-term and effective protection for the sewing machine. In addition, the formed coating surface is smooth and flat, and has good decorative properties.

[0039] The modified epoxy resin molecules introduced in the present invention contain active groups such as hydroxyl groups and epoxy groups, which can react chemically with hydroxyl groups and carboxyl groups on the surface of the sewing machine to form chemical bonds, thereby improving the adhesion between the powder coating and the sewing machine.

[0040] Compared with conventional epoxy resins, the modified epoxy resin prepared by the present invention has good flexibility and wettability, can be fully spread on the surface of the sewing machine, and increase the contact area with the sewing machine, thereby greatly improving the adhesion to the surface of the sewing machine through the van der Waals force between molecules, and is not easy to fall off.

[0041] The modified epoxy resin prepared by the present invention can undergo a cross-linking reaction with a curing agent to form a three-dimensional network structure, thereby forming a more stable coating structure, which can prevent the penetration of corrosive media, thereby improving the chemical corrosion resistance of the powder coating.

[0042] By cooperating with the first filler and the second filler, it can be evenly dispersed in the epoxy resin matrix to play a reinforcing role and improve the mechanical properties of the coating formed by the powder coating. The molecular chain structure of the modified epoxy resin is modified to give it appropriate flexibility, which can improve the fluidity of the powder coating in the molten state and further improve the leveling property. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The following are specific embodiments Example 1

[0045] The solvent-resistant powder coating for sewing machines comprises the following ingredients by weight: 65 parts of modified epoxy resin, 5 parts of first filler, 10 parts of second filler, 3 parts of titanium dioxide, 35 parts of phenolic resin, 4 parts of curing agent, 1 part of antioxidant, 2 parts of leveling agent and 1 part of tetramethoxymethyl glycoluril;

[0046] The weight ratio of the first filler to the second filler is 1:2.

[0047] The preparation method of modified epoxy resin is as follows:

[0048] First, the organic solvent is preheated to 35°C, and then the eucommia gum is added to the preheated organic solvent, stirred for 10 minutes, and then the system temperature is adjusted to 40°C, kept warm, and stirred for 2 hours to obtain the eucommia gum solution, which is kept warm for later use;

[0049] Among them, the stirring speed is 500r / min;

[0050] Add castor oil to the insulated eucommia gum solution prepared above, stir for 10 minutes, then adjust the system temperature to 68°C, insulate and stir for 2 hours, then adjust the temperature to 80°C, continue stirring for 4 hours to obtain a modified material solution, insulate and set aside;

[0051] Among them, the stirring speed is 350r / min;

[0052] Add epoxy resin to the heat-insulated modified material solution, stir for 1 hour, and then treat with ultrasound for 30 minutes to obtain a mixed dispersion;

[0053] Among them, the stirring speed is 650r / min;

[0054] The mixed dispersion is evaporated to recover the organic solvent to obtain a modified epoxy resin; the organic solvent is xylene;

[0055] The mixing ratio of eucommia gum and xylene is 12g:200mL; the molecular weight of eucommia gum is 160000;

[0056] The density of the eucommia gum is 0.96 g / cm³; the mixed mass ratio of castor oil and eucommia gum solution is 1:5;

[0057] The epoxy resin is epoxy resin E51;

[0058] The epoxy resin E51 and the modified material solution are mixed in a mass ratio of 1:1;

[0059] The ultrasonic frequency is 50kHz;

[0060] Among them, the average molecular weight of epoxy resin E51 is 420;

[0061] The epoxy value of epoxy resin E51 is 0.51 mol / 100g; the curing agent is a mixture of ethylenediamine and diethylenetriamine;

[0062] The mass ratio of ethylenediamine to diethylenetriamine is 1:3; the antioxidant is antioxidant 168; the leveling agent is BYK-301; the first filler is a mixture of calcium carbonate and bentonite;

[0063] The mass ratio of calcium carbonate to bentonite is 10:1; the second filler is a mixture of nano-silicon dioxide and graphene;

[0064] Wherein, the mixing mass ratio of nano-silicon dioxide and graphene is 20:1. Example 2

[0065] The solvent-resistant powder coating for sewing machines comprises the following components by weight: 68 parts of modified epoxy resin, 5.5 parts of first filler, 11 parts of second filler, 3.5 parts of titanium dioxide, 36 parts of phenolic resin, 5 parts of curing agent, 1.2 parts of antioxidant, 2.5 parts of leveling agent, and 1.2 parts of tetramethoxymethyl glycoluril;

[0066] The weight ratio of the first filler to the second filler is 1:2.

[0067] The preparation method of modified epoxy resin is as follows:

[0068] First, the organic solvent is preheated to 35°C, and then the eucommia gum is added to the preheated organic solvent, stirred for 10 minutes, and then the system temperature is adjusted to 40°C, kept warm, and stirred for 2 hours to obtain the eucommia gum solution, which is kept warm for later use;

[0069] Among them, the stirring speed is 500r / min;

[0070] Add castor oil to the insulated eucommia gum solution prepared above, stir for 10 minutes, then adjust the system temperature to 68°C, insulate and stir for 2 hours, then adjust the temperature to 80°C, continue stirring for 4 hours to obtain a modified material solution, insulate and set aside;

[0071] Among them, the stirring speed is 350r / min;

[0072] Add epoxy resin to the heat-insulated modified material solution, stir for 1 hour, and then treat with ultrasound for 30 minutes to obtain a mixed dispersion;

[0073] Among them, the stirring speed is 650r / min;

[0074] The mixed dispersion is evaporated to recover the organic solvent to obtain a modified epoxy resin; the organic solvent is xylene;

[0075] The mixing ratio of eucommia gum and xylene is 12g:200mL; the molecular weight of eucommia gum is 160000;

[0076] The density of the eucommia gum is 0.96 g / cm³; the mass ratio of castor oil to eucommia gum solution is 1:6;

[0077] The epoxy resin is epoxy resin E51;

[0078] The epoxy resin E51 and the modified material solution are mixed in a mass ratio of 1:1;

[0079] The ultrasonic frequency is 50kHz;

[0080] Among them, the average molecular weight of epoxy resin E51 is 420;

[0081] The epoxy value of epoxy resin E51 is 0.51 mol / 100g; the curing agent is a mixture of ethylenediamine and diethylenetriamine;

[0082] The mass ratio of ethylenediamine to diethylenetriamine is 1:3; the antioxidant is antioxidant 168; the leveling agent is BYK-301; the first filler is a mixture of calcium carbonate and bentonite;

[0083] The mass ratio of calcium carbonate to bentonite is 10:1; the second filler is a mixture of nano-silicon dioxide and graphene;

[0084] Among them, the mixing mass ratio of nano-silicon dioxide and graphene is 20:1.

[0085] Example 3

[0086] The solvent-resistant powder coating for sewing machines comprises the following ingredients by weight: 70 parts of modified epoxy resin, 5.2 parts of first filler, 10.4 parts of second filler, 4 parts of titanium dioxide, 37 parts of phenolic resin, 5 parts of curing agent, 1.4 parts of antioxidant, 2.2 parts of leveling agent, and 1.5 parts of tetramethoxymethyl glycoluril;

[0087] The weight ratio of the first filler to the second filler is 1:2.

[0088] The preparation method of modified epoxy resin is as follows:

[0089] First, the organic solvent is preheated to 35°C, and then the eucommia gum is added to the preheated organic solvent, stirred for 10 minutes, and then the system temperature is adjusted to 40°C, kept warm, and stirred for 2 hours to obtain the eucommia gum solution, which is kept warm for later use;

[0090] Among them, the stirring speed is 500r / min;

[0091] Add castor oil to the insulated eucommia gum solution prepared above, stir for 10 minutes, then adjust the system temperature to 68°C, insulate and stir for 2 hours, then adjust the temperature to 80°C, continue stirring for 4 hours to obtain a modified material solution, insulate and set aside;

[0092] Among them, the stirring speed is 350r / min;

[0093] Add epoxy resin to the heat-insulated modified material solution, stir for 1 hour, and then treat with ultrasound for 30 minutes to obtain a mixed dispersion;

[0094] Among them, the stirring speed is 650r / min;

[0095] The mixed dispersion is evaporated to recover the organic solvent to obtain a modified epoxy resin; the organic solvent is xylene;

[0096] The mixing ratio of eucommia gum and xylene is 12g:200mL; the molecular weight of eucommia gum is 160000;

[0097] The density of the eucommia gum is 0.96 g / cm³; the mass ratio of castor oil to eucommia gum solution is 1:6;

[0098] The epoxy resin is epoxy resin E51;

[0099] The epoxy resin E51 and the modified material solution are mixed in a mass ratio of 1:1;

[0100] The ultrasonic frequency is 50kHz;

[0101] Among them, the average molecular weight of epoxy resin E51 is 420;

[0102] The epoxy value of epoxy resin E51 is 0.51 mol / 100g; the curing agent is a mixture of ethylenediamine and diethylenetriamine;

[0103] The mass ratio of ethylenediamine to diethylenetriamine is 1:3; the antioxidant is antioxidant 168; the leveling agent is BYK-301; the first filler is a mixture of calcium carbonate and bentonite;

[0104] The mass ratio of calcium carbonate to bentonite is 10:1; the second filler is a mixture of nano-silicon dioxide and graphene;

[0105] Among them, the mixing mass ratio of nano-silicon dioxide and graphene is 20:1.

[0106] Example 4

[0107] The solvent-resistant powder coating for sewing machines comprises the following ingredients by weight: 72 parts of modified epoxy resin, 6 parts of first filler, 12 parts of second filler, 5 parts of titanium dioxide, 38 parts of phenolic resin, 6 parts of curing agent, 1.5 parts of antioxidant, 3 parts of leveling agent, and 2 parts of tetramethoxymethyl glycoluril;

[0108] The weight ratio of the first filler to the second filler is 1:2.

[0109] The preparation method of modified epoxy resin is as follows:

[0110] First, the organic solvent is preheated to 35°C, and then the eucommia gum is added to the preheated organic solvent, stirred for 10 minutes, and then the system temperature is adjusted to 40°C, kept warm, and stirred for 2 hours to obtain the eucommia gum solution, which is kept warm for later use;

[0111] Among them, the stirring speed is 500r / min;

[0112] Add castor oil to the insulated eucommia gum solution prepared above, stir for 10 minutes, then adjust the system temperature to 68°C, insulate and stir for 2 hours, then adjust the temperature to 80°C, continue stirring for 4 hours to obtain a modified material solution, insulate and set aside;

[0113] Among them, the stirring speed is 350r / min;

[0114] Add epoxy resin to the heat-insulated modified material solution, stir for 1 hour, and then treat with ultrasound for 30 minutes to obtain a mixed dispersion;

[0115] Among them, the stirring speed is 650r / min;

[0116] The mixed dispersion is evaporated to recover the organic solvent to obtain a modified epoxy resin; the organic solvent is xylene;

[0117] The mixing ratio of eucommia gum and xylene is 12g:200mL; the molecular weight of eucommia gum is 160000;

[0118] The density of the eucommia gum is 0.96 g / cm³; the mixed mass ratio of castor oil and eucommia gum solution is 1:8;

[0119] The epoxy resin is epoxy resin E51;

[0120] The epoxy resin E51 and the modified material solution are mixed in a mass ratio of 1:1;

[0121] The ultrasonic frequency is 50kHz;

[0122] Among them, the average molecular weight of epoxy resin E51 is 420;

[0123] The epoxy value of epoxy resin E51 is 0.51 mol / 100g; the curing agent is a mixture of ethylenediamine and diethylenetriamine;

[0124] The mass ratio of ethylenediamine to diethylenetriamine is 1:3; the antioxidant is antioxidant 168; the leveling agent is BYK-301; the first filler is a mixture of calcium carbonate and bentonite;

[0125] The mass ratio of calcium carbonate to bentonite is 10:1; the second filler is a mixture of nano-silicon dioxide and graphene;

[0126] Among them, the mixing mass ratio of nano-silicon dioxide and graphene is 20:1.

[0127] Comparative Example 1:

[0128] Based on the technical solution of Example 1, the difference from the technical solution of Example 1 is that the modified epoxy resin is replaced by conventional epoxy resin E51.

[0129] Comparative Example 2:

[0130] Based on the technical solution of Example 1, the difference from the technical solution of Example 1 is that the second filler is not added.

[0131] test:

[0132] Performance test: under the same conditions, the samples of the embodiment and the comparative example were sprayed onto a steel plate, baked at 158°C for 40 min, with a coating thickness of 45 μm ± 1 μm, and the performance was tested;

[0133] Referring to the solvent resistance test in clause 8.1 of the standard "SEFA8M-2016 Laboratory Grade Metal Products", the coatings prepared in the examples and comparative examples were subjected to solvent resistance tests:

[0134] Rating standard: 0-no visible change;

[0135] Level 1 - Slight change in color or gloss;

[0136] Level 2 - slight surface corrosion or severe contamination;

[0137] Level 3: The coating has obvious or severe damage such as pitting, depression, bulge or erosion;

[0138] Table 1 Ethyl acetate

[0139]

[0140] As can be seen from Table 1, the powder coating prepared by the present invention has excellent ethyl acetate resistance;

[0141] Table 2 Acetone

[0142]

[0143] It can be seen from Table 2 that the powder coating prepared by the present invention has excellent acetone resistance;

[0144] Table 3 Carbon tetrachloride

[0145]

[0146] It can be seen from Table 3 that the powder coating prepared by the present invention has excellent carbon tetrachloride resistance.

[0147] Impact resistance test: Refer to GB / T1732-1993 Test:

[0148] Table 4

[0149]

[0150] It can be seen from Table 4 that the powder coating prepared by the present invention has excellent impact resistance.

[0151] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification, should be within the protection scope of the present invention.

Claims

1. Solvent-resistant powder coating for sewing machines, characterized in that: The following ingredients are included by weight: 65-72 parts of modified epoxy resin, 5-6 parts of first filler, 10-12 parts of second filler, 3-5 parts of titanium dioxide, 35-38 parts of phenolic resin, 4-6 parts of curing agent, 1-1.5 parts of antioxidant, 2-3 parts of leveling agent, and 1-2 parts of tetramethoxymethyl glycoluril; The weight ratio of the first filler to the second filler is 1:2; the first filler is a mixture of calcium carbonate and bentonite at a mass ratio of 10:1; the second filler is a mixture of nano-silicon dioxide and graphene at a mass ratio of 20:1; The modified epoxy resin preparation method is: First, the organic solvent is preheated to 35°C, and then the eucommia gum is added to the preheated organic solvent, stirred for 10 minutes, and then the system temperature is adjusted to 40°C, kept warm, and stirred for 2 hours to obtain the eucommia gum solution, which is kept warm for later use; Among them, the stirring speed is 500r / min; Add castor oil to the insulated eucommia gum solution, stir for 10 minutes, then adjust the system temperature to 68°C, insulate and stir for 2 hours, then adjust the temperature to 80°C, continue stirring for 4 hours to obtain a modified material solution, insulate and set aside; Among them, the stirring speed is 350r / min; Add epoxy resin to the heat-insulated modified material solution, stir for 1 hour, and then treat with ultrasound for 30 minutes to obtain a mixed dispersion; Among them, the stirring speed is 650r / min; The mixed dispersion is evaporated to recover the organic solvent, thereby obtaining a modified epoxy resin.

2. The solvent-resistant powder coating for sewing machines according to claim 1, characterized in that: The organic solvent is xylene; The mixing ratio of the eucommia gum and xylene is 12g:200mL.

3. The solvent-resistant powder coating for sewing machines according to claim 2, characterized in that: The molecular weight of the eucommia gum is 160000; The density of the eucommia gum is 0.96 g / cm 3 .

4. The solvent-resistant powder coating for sewing machines according to claim 1, characterized in that: The castor oil and eucommia gum solution are mixed in a mass ratio of 1:5-8; The epoxy resin is epoxy resin E51; The epoxy resin E51 and the modified material solution are mixed in a mass ratio of 1:1; The ultrasonic frequency is 50kHz; Among them, the average molecular weight of epoxy resin E51 is 420; The epoxy value of epoxy resin E51 is 0.51 mol / 100g.

5. The solvent-resistant powder coating for sewing machines according to claim 1, characterized in that: The curing agent is a mixture of ethylenediamine and diethylenetriamine; The mixing mass ratio of ethylenediamine to diethylenetriamine is 1:

3.

6. The solvent-resistant powder coating for sewing machines according to claim 1, characterized in that: The antioxidant is antioxidant 168.

7. The solvent-resistant powder coating for sewing machines according to claim 1, characterized in that: The leveling agent is BYK-301.

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