CN118652542B - A kind of instantaneous hydrophilic long carbon chain polyamide powder material and preparation method thereof - Google Patents
A kind of instantaneous hydrophilic long carbon chain polyamide powder material and preparation method thereofInfo
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- CN118652542B CN118652542B CN202410841998.1A CN202410841998A CN118652542B CN 118652542 B CN118652542 B CN 118652542B CN 202410841998 A CN202410841998 A CN 202410841998A CN 118652542 B CN118652542 B CN 118652542B
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- polyamide powder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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Abstract
本发明公开了一种瞬时亲水长碳链聚酰胺粉末材料及其制备方法，由长碳链聚酰胺粉料100份、干涉材料0.2‑1.5份、耐污染助剂0.01‑0.1份、亲水助剂0.05‑0.5份，以及其他助剂0‑2份按照重量份制备而成。本发明采用多羟基化合物作为亲水助剂，使尼龙涂层浸水后能快速被水浸润，避免出现水泡、缩孔等情况，但会出现鱼眼；而耐污染助剂则可以预防亲水助剂产生鱼眼。因此亲水助剂和耐污染助剂的组合，能起到协同作用，弥补相互的缺点。而这一亲水效果是瞬时的，在最终产品中，涂层表面仍表现疏水性。The present invention discloses an instantaneous hydrophilic long carbon chain polyamide powder material and a preparation method thereof, which is prepared by weight from 100 parts of long carbon chain polyamide powder, 0.2-1.5 parts of interference material, 0.01-0.1 parts of pollution-resistant additives, 0.05-0.5 parts of hydrophilic additives, and 0-2 parts of other additives. The present invention adopts polyhydroxy compounds as hydrophilic additives so that the nylon coating can be quickly wetted by water after being immersed in water, avoiding the occurrence of blisters, shrinkage holes and the like, but fish eyes will appear; while the pollution-resistant additive can prevent the hydrophilic additive from producing fish eyes. Therefore, the combination of hydrophilic additives and pollution-resistant additives can play a synergistic role and make up for each other's shortcomings. This hydrophilic effect is instantaneous, and in the final product, the coating surface still shows hydrophobicity.
Description
Technical Field
The invention relates to the field of modification of high polymer materials, in particular to an instantaneous hydrophilic long carbon chain polyamide powder material and a preparation method thereof.
Background
The dish washing basket is a basket formed by wires for bearing dishes in a dish washing machine, and is mainly formed by welding carbon steel wires, and a layer of resin material with good toughness, heat resistance and water resistance is coated on the surface of the basket. The plastic coating on the surface of the bowl basket is mainly made of long carbon chain nylon or polypropylene at present, and is usually realized by adopting a plastic dipping mode.
The bowl basket powder is generally wrapped on a carbon steel wire frame in a plastic dipping mode, namely, the bowl basket powder is put into a fluidization barrel, the fluidization barrel is inflated to fluidize the bowl basket powder, then the bowl basket carbon steel frame is heated to 300-500 ℃, immersed into the bowl basket powder fluidization barrel to vibrate for a plurality of seconds, then placed into a leveling furnace with the temperature of 200-250 ℃ to level for 0.5-3min, and immediately immersed into cooling water after coming out of the leveling furnace, so that the plastic dipping of the whole bowl basket is completed.
Because the bowl basket powder is usually made of long-chain nylon, and a few auxiliary agents are usually added, the formed coating has hydrophobicity. Thus, during the immersion process, the water does not sufficiently infiltrate the coating surface, especially on some welds, and it is more difficult for the water to spread to all corners. The difference in thermal conductivity between the air bubbles and water causes the defects that the nylon coating adhered with the air bubbles dissipates heat more slowly and the coating contacted with the water dissipates heat more rapidly, and the solidification speed of the nylon coating and the coating is different, so that convex water bubbles are formed on the surface of the thick wire, and shrinkage holes are formed on the welding points, namely the shrinkage holes. In order to improve the infiltration of water to nylon coating, a surfactant can be added into the soaking tank, for example, the 'water bubbles' on the surface of the thick wire can be improved by using a household detergent, but the 'shrinkage holes' formed at the welding points cannot be completely eliminated, the root cause is the hydrophobicity of the resin, the dead angle of the wire is superposed, and the welding points cannot be fully infiltrated by cooling water.
Disclosure of Invention
In view of the above, the present invention provides an instant hydrophilic long carbon chain polyamide powder material and a preparation method thereof, which solve the problems in the prior art, and adopts polyhydroxy compounds as hydrophilic auxiliary agents, so that the nylon coating can be quickly soaked by water after soaking, the situations of blister, shrinkage cavity, etc. are avoided, but fish eyes are generated, and the pollution-resistant auxiliary agents can prevent the hydrophilic auxiliary agents from generating fish eyes. Therefore, the combination of the hydrophilic auxiliary agent and the pollution-resistant auxiliary agent can play a synergistic effect to make up the mutual defects. While this hydrophilic effect is transient, the coating surface still exhibits hydrophobicity in the final product.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The invention discloses an instantaneous hydrophilic long carbon chain polyamide powder material which is prepared from 100 parts of long carbon chain polyamide powder, 0.2-1.5 parts of interference material, 0.01-0.1 part of pollution-resistant auxiliary agent, 0.05-0.5 part of hydrophilic auxiliary agent and 0-2 parts of other auxiliary agents according to parts by weight.
As a further scheme of the invention, the polyamide powder is at least one of PA11, PA12, PA610, PA612, PA510, PA513, PA515, PA1012, PA1010, PA6, PA66, PA46, PA56 and nylon elastomer.
As a further aspect of the invention, the polyamide powder has a melt index of less than 60g/10min.
As a further aspect of the present invention, the polyamide powder has a particle size of 10 to 300. Mu.m
As a further scheme of the invention, the interference material is at least one of mica powder, glass flake and superfine metal powder.
As a further scheme of the invention, the pollution-resistant additive is at least one of mineral base oil and synthetic base oil, the viscosity of the pollution-resistant additive is lower than 1000cst, and the boiling point or short-time thermal decomposition temperature is higher than 350 ℃.
As a further scheme of the invention, the hydrophilic auxiliary is a polyhydroxy compound and an aqueous solution thereof.
As a further scheme of the invention, the solubility of the polyhydroxy compound in water is more than 100g/100g of water, the number of hydroxyl groups in the molecule is more than 2, the hydroxyl group content accounts for more than 10% of the molecular mass, the molecular weight of the compound is less than 400, the viscosity is lower than 2000cst,
As a further scheme of the invention, other auxiliary agents are one or a combination of more of toner, antioxidant and anticaking agent.
The invention also discloses a preparation method of the long carbon chain polyamide powder material, which comprises the following steps:
The preparation method comprises the steps of weighing polyamide powder, interference materials, pollution-resistant auxiliary agents and other auxiliary agents according to parts by weight, putting the polyamide powder, the interference materials, the pollution-resistant auxiliary agents and the other auxiliary agents into a high-speed mixer, and continuously stirring the mixture for 3-10min under the condition of 600-1000rpm to obtain the instant hydrophilic polyamide powder material.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, a small amount of polyhydroxy compound is added into the polyamide powder as a hydrophilic auxiliary agent, and mineral base oil is adopted as a pollution-resistant agent to act together with the hydrophilic auxiliary agent, so that the phenomenon of shrinkage cavity after the coating is immersed in water is solved, and the hydrophobicity and boiling resistance of the coating are ensured. The hydrophilicity of the polyamide powder material provided by the invention is instantaneous, namely, the surface of the coating is hydrophilic in the soaking process, so that the problem of soaking shrinkage cavity is prevented, but the polyamide powder material can be washed away by water after soaking, and the hydrophobicity of the coating is still maintained, so that the phenomena of blisters, shrinkage cavity and fish eyes of a dish washing basket during soaking can be improved, and the hydrophobicity of a final product is ensured.
Detailed Description
In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Specific information of the raw materials used in the following examples and comparative examples are as follows:
The polyamide powder is prepared by cooling polyamide particles in liquid nitrogen to below-100deg.C, mechanically pulverizing, and sieving with suitable sieve to obtain 50-250 μm powder with melt index of 50g/10min. The polyamide particles are PA1012 from Ruison in east Shandong.
PA6/PA1012 powder, DONGCHENRIESN PA1012 and Jiangsu Hongsheng BE 3250, are extruded and granulated through a double screw at the mass ratio of 70:30 at 250 ℃, and then are cooled and ground into powder by liquid nitrogen, and the powder in the range of 50-250 microns is screened.
The interference material 1 is mica powder, iriodin 6111, merck, U.S.;
The interference material 2 is selected from flaky aluminum powder STANDART PCR, eckart, germany;
hydrophilic auxiliary agent 1 glycol 200
Hydrophilic auxiliary 2:10% sucrose aqueous solution
Pollution-resistant auxiliary agent, namely alpha-olefin oil (PAO 40), viscosity 400cst and kokuya;
The toner is titanium yellow, SPP-1060, happiness;
bruggolen H10 antioxidants, bulgerman;
an anticaking agent, aerosil R972, evonik;
all materials are commercially available conventional and commonly used products.
It will be appreciated that the above raw material reagents are only examples of some embodiments of the invention, so that the technical solution of the invention is more clear, and it is not represented that the invention can only employ the above reagents, and the scope of the claims is in particular. In addition, "parts" described in examples and comparative examples refer to parts by weight unless otherwise specified.
Any range recited in the invention includes any numerical value between the endpoints and any sub-range of any numerical value between the endpoints or any numerical value between the endpoints.
Examples and comparative examples were prepared as follows:
The polyamide powder, the hydrophilic auxiliary agent, the pollution-resistant auxiliary agent, the interference material and other auxiliary agents are weighed according to the following proportion in the table 1 and put into a high-speed mixer, and continuously stirred for 6min under the condition of 800rpm, so that the final polyamide powder product is obtained.
TABLE 1
All the products obtained in the examples and comparative examples were tested as follows:
a. And (3) putting the obtained polyamide powder coating finished product into a fluidization barrel, and observing the fluidity of the powder coating after introducing compressed air. The steel sheet (100 mm. Times.70 mm. Times.2 mm) with rust and oil removed is heated to 300-400 ℃, immersed in the powder coating for 3-10 seconds, and after being taken out, the appearance of the plastic-immersed "fish eyes" is observed.
And b, respectively arranging 4 iron wires with the diameter of 6mm and 4 iron wires with the diameter of 3mm in the longitudinal and transverse directions, welding, wherein the interval between the wires is 2cm, obtaining a metal frame, heating the metal frame to 300-400 ℃ for dip molding, then returning the temperature to 220 ℃ for 1min to enable the surface coating to be completely leveled, immediately immersing in purified water for cooling, and observing the shrinkage cavity number of the welding point after fishing.
C. Contact angle 10. Mu.L of purified water was dropped onto the surface of the metal frame coating, and the contact angle was measured by fitting the shape of the drop to a video light contact angle tester.
D. the coated metal frame was put into 80 ℃ hot water and boiled for 7x 24h to observe whether the surface of the iron plate is foamed and rusted.
The test results are shown in Table 2.
TABLE 2
| Test item | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Number of fish eyes | 0 | 2 | 0 | 15 | 32 | 0 | 0 |
| 80 ℃ Hot water resistance | No rust foaming | No rust foaming | No rust foaming | No rust foaming | No rust foaming | No rust foaming | Foaming |
| Number of shrinkage cavities | 1 | 0 | 0 | 0 | 0 | 12 | 6 |
| Contact angle | 102 | 95 | 96 | 95 | 93 | 97 | 82 |
Analysis was performed in conjunction with tables 1-2:
As is clear from the combination of comparative examples 1 and 2 and example 1, comparative example 1 was free from the addition of a hydrophilic auxiliary and a stain-resistant agent, and the product appeared some fish eyes, whereas comparative example 2 was free from the addition of a hydrophilic auxiliary, which resulted in a large increase in the number of fish eyes, because the hydrophilic auxiliary itself formed fish eyes, and after the addition of a stain-resistant auxiliary, the fish eyes were completely eliminated, and the product did not cause shrinkage, nor shrinkage after the addition of a hydrophilic auxiliary, and after the addition of a stain-resistant auxiliary, an acceptable number of shrinkage was produced. The addition of the stain-resistant aid results in an increase in the contact angle of the coating, whereas the product contact angle of the hydrophilic aid alone does not change much, since the hydrophilic aid is dissolved during the immersion process.
As is clear from the combination of comparative example 3 and example 2, the contact angle of the coating surface is only slightly higher than that of the coating surface with the hydrophilic auxiliary and the pollution-resistant auxiliary added at the same time, but the number of shrinkage cavities is greatly increased, which indicates that the hydrophilic auxiliary has a great effect of improving shrinkage cavities.
As is clear from the combination of comparative example 4 and example 3, even when a more hydrophilic PA6/PA1012 resin was used, shrinkage cavity still occurred when the contamination resistance auxiliary agent was added alone, and the hot water resistance of the resin was lowered due to the use of PA6 having higher water absorbability, and the phenomena of detachment of the coating layer and foaming of the iron plate occurred within 7 days of water boiling.
Although the present disclosure describes embodiments, not every embodiment is described in terms of a single embodiment, and such description is for clarity only, and one skilled in the art will recognize that the embodiments described in the disclosure as a whole may be combined appropriately to form other embodiments that will be apparent to those skilled in the art.
Therefore, the above description is not intended to limit the scope of the application, but rather should be construed in view of the appended claims.
Claims (7)
1. The instant hydrophilic long carbon chain polyamide powder material is characterized by being prepared from 100 parts of long carbon chain polyamide powder, 0.2-1.5 parts of interference material, 0.01-0.1 part of pollution-resistant auxiliary agent, 0.05-0.5 part of hydrophilic auxiliary agent and 0-2 parts of other auxiliary agents according to parts by weight;
the interference material is at least one of mica powder, glass flake and superfine metal powder;
the pollution-resistant auxiliary agent is at least one of mineral base oil and synthetic base oil;
The hydrophilic auxiliary agent is polyhydroxy compound and aqueous solution thereof.
2. The long carbon chain polyamide powder material according to claim 1, wherein the polyamide powder is at least one of PA11, PA12, PA610, PA612, PA510, PA513, PA515, PA1012, PA 1010.
3. The long carbon chain polyamide powder material of claim 1, wherein the polyamide powder has a particle size of 10 to 300 microns.
4. The long carbon chain polyamide powder material of claim 1, wherein the stain resistant additive has a viscosity of less than 1000cst and a boiling point or short time thermal decomposition temperature of greater than 350 ℃.
5. The long carbon chain polyamide powder material of claim 1 wherein the polyol has a solubility in water of >100g/100g water, a hydroxyl number of >2 in the molecule, a hydroxyl content of >10% by mass, a compound molecular weight <400, and a viscosity of less than 2000cst.
6. The long carbon chain polyamide powder material according to claim 1, wherein the other auxiliary agent is one or a combination of more of toner, antioxidant and anticaking agent.
7. A method for preparing a long carbon chain polyamide powder material according to any one of claims 1 to 6, comprising the steps of:
the preparation method comprises the steps of weighing polyamide powder, interference materials, pollution-resistant auxiliary agents, hydrophilic auxiliary agents and other auxiliary agents according to parts by weight, putting the polyamide powder, the interference materials, the pollution-resistant auxiliary agents, the hydrophilic auxiliary agents and the other auxiliary agents into a high-speed mixer, and continuously stirring the mixture for 3-10min under the condition of 600-1000rpm to obtain the instant hydrophilic polyamide powder material.
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| CN115260895A (en) * | 2022-05-30 | 2022-11-01 | 会通新材料(上海)有限公司 | Polyamide powder coating for metal surface coating and preparation method thereof |
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