阅读说明：本技术 一种低温粉末涂料及其在袜套上的应用 (Low-temperature powder coating and application thereof to sock covers ) 是由 托马斯·沃尔特施密特 姜兴盛 俞铧 赖文钦 李天源 庞南·萨蒂安娜森 吴建通 陆东东 于 2021-07-08 设计创作，主要内容包括：本发明涉及粉末涂料技术领域,具体涉及一种低温粉末涂料及其在袜套上的应用。相比于现有的在袜套上贴附TPU的方法,该低温粉末涂料涂覆在袜套上,可实现较低温度短时间内固化,耐磨性能好,膜层光滑,附着力强,特别适用于袜套专用低温固化粉末涂料,极大地拓展了粉末涂料在热敏基材、尤其是纺织面料上的应用。(The invention relates to the technical field of powder coating, in particular to low-temperature powder coating and application thereof to socks. Compared with the existing method for attaching TPU on the sock, the low-temperature powder coating can be cured at a lower temperature in a short time when being coated on the sock, has good wear resistance, smooth film layer and strong adhesive force, is particularly suitable for the low-temperature cured powder coating special for the sock, and greatly expands the application of the powder coating on thermosensitive base materials, especially textile fabrics.)

1. A low temperature powder coating comprising a thermosetting resin and one or more of the following components: curing agent, accelerator, catalyst, flow additive, degassing agent, photoinitiator and titanium dioxide.

2. A low temperature powder coating according to claim 1, wherein the low temperature powder coating is made from the following components in weight percent:

30-50% of polyester resin;

30-50% of epoxy resin;

0.5 to 3 percent of accelerant;

0.3 to 1.5 percent of catalyst;

0.5-3% of flow additive;

0.1-1% of degassing agent;

12-25% of titanium dioxide.

3. A low temperature powder coating according to claim 2, wherein the low temperature powder coating is made from the following components in weight percent:

Crylcoat 1506-6，40％；

Araldite GT7272，40％；

2-MI，2％；

TBAB，0.5％；

Resiflow PV-5，1％；

Worlee Add 902，0.5％；

Kronos 2160，16％。

4. a low temperature powder coating according to claim 1, wherein the low temperature powder coating is made from the following components in weight percent:

50-75% of unsaturated polyester;

7-20% of vinyl ether polyester;

1-5% of curing agent;

0.5-3% of flow additive;

0.1-2% of degassing agent;

10-25% of titanium dioxide.

5. The low-temperature powder coating according to claim 4, wherein the low-temperature powder coating is prepared from the following components in percentage by weight:

Uracross P 3125，66.9％；

Uracross P 3307，13.6％；

Trigonox 82，3％；

Resiflow PV-5，1％；

Worlee Add 902，0.5％；

Kronos 2160，15％。

6. a low temperature powder coating according to claim 1, characterized by being made from the following components in weight percent:

50-75% of unsaturated polyester;

10-20% of vinyl ether polyester;

1-5% of photoinitiator;

0.5-2% of flow additive;

0.1-2% of degassing agent;

10-25% of titanium dioxide.

7. The low-temperature powder coating according to claim 6, wherein the low-temperature powder coating is prepared from the following components in percentage by weight:

Uracross P 3125，66.9％；

Uracross P 3307，13.6％；

Irgacure 2959，1％；

Irgacure 819，2％；

Resiflow PV-5，1％；

Worlee Add 902，0.5％；

Kronos 2160，15％。

8. use of a low temperature powder coating for socks, wherein the low temperature powder coating is as claimed in any one of claims 1 to 7.

9. Use according to claim 8, characterized in that the low-temperature powder coating is applied uniformly to the sock by means of an electrostatic spraying process.

10. Use according to claim 9, characterized in that the electrostatic spraying method comprises the following steps:

(1) spraying: uniformly spraying the low-temperature powder coating on the sock sleeves;

(2) curing to form a film: and heating and curing the low-temperature powder coating on the sock to form a powder coating.

Technical Field

The invention relates to the technical field of powder coating, in particular to low-temperature powder coating and application thereof to socks.

Background

The powder coating is a solid powder coating without solvent, has the advantages of environmental protection, no pollution, high efficiency, energy conservation, simple and convenient process, firm and durable coating and the like, and the solid coating allows the powder coating to be collected, purified and reused. The application range of the powder coating is rapidly permeated from the initial household appliance field to various industries, and the powder coating is expanded to dozens of industries such as petrochemical industry, electromechanical instruments, ships, electronic devices, buildings, transportation, machinery, automobiles, containers, packaging, aerospace, water conservancy, computers, railways, weaponry and the like. However, the curing temperatures of the existing polyester/TGIC powder coating films are high, typically 180 ℃ to 200 ℃, and due to this temperature limitation, powder coatings are not readily used for coating heat sensitive substrates such as Medium Density Fiberboard (MDF), wood, plastics and certain metal alloys. In addition, low molecular weight organic substances remaining in the TGIC are easily volatilized under high temperature curing, which has certain influence on the environment and human health.

The sock cover is an article which is mainly made of knitted fabric and can replace shoes for use, can tightly wrap the feet like socks, and is light and comfortable like wearing the socks. TPU or high-elasticity waterproof and wear-resistant adhesive films with the same property are usually attached to the heel part, the tiptoe part and the sole part of the sock so as to enhance the wear resistance of the sock. However, the hot pressing or sewing process of TPU is difficult and easily comes off. Also, in the art, no reports have appeared to enhance the wear resistance of socks using powder coatings.

Therefore, if a low-temperature powder coating can be developed and applied to the sock sleeves, the application of the powder coating to heat-sensitive substrates, particularly textile fabrics, can be expanded.

Disclosure of Invention

Therefore, the low-temperature powder coating and the application thereof on the sock are needed to be provided, the low-temperature powder coating can realize low-temperature curing, has good wear resistance, smooth film layer and strong adhesive force, and is particularly suitable for the low-temperature curing powder coating special for the sock.

To achieve the above object, a first aspect of the present invention provides a low-temperature powder coating comprising a thermosetting resin, and one or more of the following components: curing agent, accelerator, catalyst, flow additive, degassing agent, photoinitiator and titanium dioxide.

Preferably, the low-temperature powder coating is prepared from the following components in percentage by weight:

30-50% of polyester resin;

30-50% of epoxy resin;

0.5 to 3 percent of accelerant;

0.3 to 1.5 percent of catalyst;

0.5-3% of flow additive;

0.1-1% of degassing agent;

12-25% of titanium dioxide.

Preferably, the polyester resin is a low-temperature high-acid-value polyester resin, the acid value of the polyester resin is 42-75 mgKOH/g, and Crylcoat 1506-6 is preferred.

Preferably, the epoxy resin is a bisphenol a type epoxy resin including Araldite GT6071, Araldite GT7071, Araldite GT7072, Araldite GT6097 and Araldite GT6099, preferably Araldite GT 7272.

Preferably, the accelerator is selected from one of 2-methylimidazole (2-MI), 2-phenylamidine (2PZ), 2-ethyl-4-methylimidazole (2E4MZ), 2-phenyl-4-methylimidazole (2P4MZ), preferably 2-MI.

Preferably, the catalyst is tetrabutylammonium bromide.

Preferably, the low-temperature powder coating is prepared from the following components in percentage by weight:

Crylcoat 1506-6，40％；

Araldite GT7272，40％；

2-MI，2％；

TBAB，0.5％；

Resiflow PV-5，1％；

WorleeAdd 902，0.5％；

Kronos 2160，16％。

preferably, the low-temperature powder coating is prepared from the following components in percentage by weight:

50-75% of unsaturated polyester;

7-20% of vinyl ether polyester;

1-5% of curing agent;

0.5-3% of flow additive;

0.1-2% of degassing agent;

10-25% of titanium dioxide.

Preferably, the low-temperature powder coating is prepared from the following components in percentage by weight:

Uracross P 3125，66.9％；

Uracross P 3307，13.6％；

Trigonox 82，3％；

Resiflow PV-5，1％；

Worlee Add 902，0.5％；

Kronos 2160，15％。

preferably, the composition is prepared from the following components in percentage by weight:

50-75% of unsaturated polyester;

10-20% of vinyl ether polyester;

1-5% of photoinitiator;

0.5-2% of flow additive;

0.1-2% of degassing agent;

10-25% of titanium dioxide.

Preferably, the low-temperature powder coating is prepared from the following components in percentage by weight:

Uracross P 3125，66.9％；

Uracross P 3307，13.6％；

Irgacure 2959，1％；

Irgacure 819，2％；

Resiflow PV-5，1％；

Worlee Add 902，0.5％；

Kronos 2160，15％。

according to a second aspect of the present invention, there is provided a use of a low temperature powder coating for socks, wherein the low temperature powder coating is the low temperature powder coating according to the first aspect of the present invention.

Preferably, the low-temperature powder coating is uniformly applied to the sock by coating techniques including spin coating, dip coating, blade coating, curtain coating, brush coating, electrostatic spraying, reverse roll, electrophoretic deposition coating.

Preferably, the low-temperature powder coating is uniformly applied to the sock by an electrostatic spraying method.

Preferably, the electrostatic spraying method comprises the steps of:

(1) spraying: uniformly spraying the low-temperature powder coating on the sock sleeves;

(2) curing to form a film: and heating and curing the low-temperature powder coating on the sock to form a powder coating.

The low-temperature powder coating can be cured at a low temperature in a short time, has good wear resistance, smooth film layer and strong adhesive force, is particularly suitable for the low-temperature cured powder coating special for the socks, and greatly expands the application of the powder coating on thermosensitive base materials, especially textile fabrics.

Drawings

Fig. 1 shows a sock coated with the low temperature powder coating of example 2.

Detailed Description

To explain technical contents, structural features, objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the specific embodiments, but not to limit the scope of the present invention. Materials, reagents, instruments and equipment used in the examples of the present invention are commercially available unless otherwise specified.

In an embodiment of the invention, there is provided a low temperature powder coating comprising a thermosetting resin, and one or more of the following components: curing agent, accelerator, catalyst, flow additive, degassing agent, photoinitiator and titanium dioxide.

Thermosetting resins are a large class of synthetic resins that undergo chemical reactions under heat and pressure or under the action of curing agents and ultraviolet light, and are crosslinked and cured into insoluble and infusible substances. Thermosetting resins include phenolic resins, epoxy resins, amino resins, unsaturated polyesters, vinyl ether polyesters, and the like. Preferably, the thermosetting resin includes polyester resin, epoxy resin, unsaturated polyester and vinyl ether polyester. In the embodiment of the invention, the polyester resin is low-temperature high-acid-value polyester resin, and the acid value range is 42-75 mgKOH/g; preferably Crylcoat 1506-6, available from Zhan new resins (China) Inc.

The related epoxy resin is bisphenol A epoxy resin, and is selected from one of Araldite GT6071, Araldite GT7071, Araldite GT7072, Araldite GT6097 and Araldite GT 6099; preferably AralditeGT7272, available from Henshimei chemical trade (Shanghai) Inc.

The unsaturated polyester referred to is Uracross P3125 available from DSM.

The vinyl ether polyester referred to is Uracross P3307 available from DSM.

The curing agent referred to was Trigonox 82, available from Akzo Nobel n.v.

The related accelerant is selected from one of 2-methylimidazole (2-MI), 2-phenyl imidazole (2PZ), 2-ethyl-4-methylimidazole (2E4MZ) and 2-phenyl-4-methylimidazole (2P4 MZ); 2-methylimidazole (2-MI) is preferred.

The catalyst involved was Tetrabutylammonium Bromide (TBAB) available from Sigma Aldrich trade ltd (Sigma-Aldrich).

The flow additive referred to is Resiflow PV-5, available from Shahar chemical GmbH, Germany (Worle e-Chemie GmbH).

The degassing agent concerned is Worlee Add 902, available from Worlee-Chemie GmbH, Shahar-Chemie, Germany.

The photoinitiator is one or the combination of Irgacure 2959 and Irgacure819, which is purchased from Bassfu.

The titanium dioxide referred to is Kronos 2160, available from Kronos-Titan GmbH, Germany.

In the embodiments of the present invention, the low temperature powder coating of the present invention may further optionally comprise other conventional additives such as antioxidants, light stabilizers, fillers, photosensitizers, etc., depending on the intended use. These additives are conventional in the art and thus are used in amounts that are conventional in the art and will not be described herein.

In embodiments of the present invention, the pigment may be selected from other materials in addition to titanium dioxide. Depending on the intended use, black, white or colored pigments, inorganic or organic pigments may be used.

In embodiments of the present invention, the low temperature powder coating of the present invention can be uniformly applied to a substrate by coating techniques including spin coating, dip coating, blade coating, curtain coating, brush coating, electrostatic spraying, reverse roll, electrophoretic deposition coating; electrostatic spraying methods are preferred.

In the electrostatic spraying method, for example, the powder coating is sprayed by using an electrostatic powder coating machine (e.g., an electrostatic gun, a friction spray gun, a swivel gun, and other types of spray guns) or the like. Further, in the sprayed powder coating, the powder coating which is not electrostatically attached to the object to be coated can be collected and reused.

Examples 1 to 9

Embodiments 1 to 3 of the invention respectively provide a low-temperature powder coating, and the curing temperature of the low-temperature powder coating is 130 ℃.

TABLE 1 composition of raw materials for low-temperature powder coatings of examples 1 to 3

Embodiments 4 to 6 of the invention respectively provide a low-temperature powder coating, and the curing temperature of the low-temperature powder coating is 120 ℃.

TABLE 2 composition of raw materials for low-temperature powder coatings of examples 4 to 6

Embodiments 7 to 9 of the invention respectively provide a UV photocuring low-temperature powder coating, and the curing temperature is 110 degrees plus UV ray Ga-and Hg-light.

TABLE 3 composition of raw materials for UV photocuring low temperature powder coatings of examples 7-9

In examples 1 to 9, the low-temperature powder coating of the present invention was prepared by the following method: the thermosetting resin, the curing agent, the accelerator, the auxiliary agent and other raw materials in the embodiments 1-9 are accurately weighed, mixed in an adjusting mixer for 3-10min, and subjected to the processes of melt extrusion, tabletting, crushing, grinding, sieving and the like to obtain the finished low-temperature powder coating.

EXAMPLE 10 use of Low temperature powder coating on socks

In the embodiment, the low-temperature powder coatings of the embodiments 1 to 9 are respectively and uniformly sprayed on the sock sleeves by using a GEMA electrostatic spraying gun (60 to 80KV), and during specific production, titanium dioxide can be mixed with carbon black or other toner of any color according to actual needs to obtain low-temperature powder coatings of different colors; and (3) baking and heating the low-temperature powder coating on the sock cover at a corresponding temperature for solidification (or ultraviolet heating for solidification) to form a powder coating film. After curing, the powder coating film was tested for properties, and the test results are shown in table 4. Wherein, as an exemplary illustration, the sock coated with the low temperature powder coating of example 2 is shown in fig. 1.

TABLE 4 test results of powder coating films of examples 1 to 9 after spraying and curing the low-temperature powder coating on socks

The invention provides a low-temperature powder coating and application thereof on socks, the low-temperature powder coating can realize low-temperature curing, is particularly suitable for the low-temperature curing powder coating special for the socks, and compared with the existing method for attaching TPU on the socks, the low-temperature powder coating disclosed by the invention is sprayed and cured on the socks, and has the advantages of good wear resistance, smooth film layer, strong adhesive force and the like.

It is noted that in the field of powder coatings, the term "low temperature" generally means temperatures significantly above room temperature but below 160 ℃, preferably below 150 ℃, more preferably below 140 ℃ and even below 130 ℃; the term "ultra-low temperature" generally means a temperature below 120 ℃.

Furthermore, it should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.