阅读说明：本技术 聚乳酸高阻隔喷涂处理装置 (Polylactic acid high-barrier spraying treatment device ) 是由 曾广胜 江太君 尹琛 孟聪 陈一 胡灿 刘水长 于 2019-11-07 设计创作，主要内容包括：本发明涉及聚乳酸制品阻隔喷涂技术领域,公开一种聚乳酸高阻隔喷涂处理装置,聚乳酸制品采用高温无机纳米粉体喷涂,包括对无机纳米粉体进行预热分散的预混管道、设于预混管道出口的喷射主管,喷射主管与预混管道呈夹角设置,预混管道内通入高温气体推动无机纳米粉体前移及预热,喷射主管内通入高温高压气体推动无机纳米粉体前移喷射。无机纳米粉体经由预混管道进入喷射主管,先在预混管道内被高温气体预热分散并推送至喷射主管内,随后喷射主管通入的高温高压气体进一步对无机纳米粉体进行分散,确保最终在聚乳酸制品表面喷射均匀。(The invention relates to the technical field of barrier spraying of polylactic acid products, and discloses a polylactic acid high-barrier spraying treatment device. The inorganic nano powder enters the main spraying pipe through the premixing pipe, is preheated and dispersed by high-temperature gas in the premixing pipe and is pushed into the main spraying pipe, and then the high-temperature high-pressure gas introduced into the main spraying pipe further disperses the inorganic nano powder, so that the uniform spraying on the surface of the polylactic acid product is ensured finally.)

1. The polylactic acid high-barrier spraying treatment device is characterized in that a polylactic acid product is sprayed by high-temperature inorganic nano powder, and the polylactic acid high-barrier spraying treatment device comprises a premixing pipeline for preheating and dispersing the inorganic nano powder and a spraying main pipe arranged at the outlet of the premixing pipeline, wherein the spraying main pipe and the premixing pipeline are arranged at an included angle, high-temperature gas is introduced into the premixing pipeline to push the inorganic nano powder to move forwards and preheat, and high-temperature high-pressure gas is introduced into the spraying main pipe to push the inorganic nano powder to move forwards and spray.

2. The polylactic acid high-barrier spraying treatment device according to claim 1, wherein a storage tank for storing inorganic nano-powder is arranged at the end part of the premixing pipeline close to the high-temperature gas inlet, the storage tank is arranged perpendicular to the premixing pipeline, and a flow control valve is arranged between the storage tank and the premixing pipeline.

3. The polylactic acid high-barrier spray treatment device according to claim 1, wherein a heater is provided on the outer periphery of the end of the main spray pipe.

4. The polylactic acid high-barrier spraying treatment device according to claim 1, wherein the high-temperature gas introduced into the premixing pipeline is high-temperature nitrogen.

5. The polylactic acid high-barrier spraying treatment device according to claim 1, wherein the high-temperature high-pressure gas introduced into the injection main pipe is high-temperature high-pressure nitrogen.

6. The polylactic acid high-barrier spraying treatment device according to claim 1, wherein the inorganic nano powder is any one or a mixture of several of nano carbon dioxide, nano graphene and nano barium sulfate.

Technical Field

The invention relates to the technical field of polylactic acid product barrier spraying, in particular to a polylactic acid high-barrier spraying treatment device.

Background

Polylactic acid is a bio-based fully biodegradable material which is prepared by taking various starches as main raw materials through fermentation, purification and combination, is widely applied to various aspects in life due to the excellent environmental protection characteristic and is accepted by more and more people.

As a bio-based polyester polylactic acid, the barrier property to water and oxygen is low, and partial application requirements cannot be met. The commonly used method for improving the barrier property of the polylactic acid is a nanoparticle blending modification method, more inorganic nanoparticles are required to be added in the method, the cost is higher, and the barrier property is influenced by the uneven dispersion of the inorganic nanoparticles. The other method is multilayer compounding, high-barrier effect is realized by introducing high-barrier resin and polylactic acid for multilayer compounding, a barrier layer is usually thin, but the process is usually applied to film products and is difficult to realize for injection molding products, and the introduced high barrier is mostly non-fully biodegradable resin, so that the overall degradation performance is influenced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a polylactic acid high-barrier spraying treatment device for improving the water and oxygen barrier performance of a polylactic acid product.

The purpose of the invention is realized by the following technical scheme:

the polylactic acid high-barrier spraying treatment device comprises a premixing pipeline for preheating and dispersing inorganic nano powder and a spraying main pipe arranged at the outlet of the premixing pipeline, wherein the spraying main pipe and the premixing pipeline are arranged at an included angle, high-temperature gas is introduced into the premixing pipeline to push the inorganic nano powder to move forwards and preheat, and high-temperature high-pressure gas is introduced into the spraying main pipe to push the inorganic nano powder to move forwards and spray.

Furthermore, a storage tank for storing the inorganic nano powder is arranged at the end part of the premixing pipeline close to the high-temperature gas inlet, the storage tank is perpendicular to the premixing pipeline, and a flow control valve is arranged between the storage tank and the premixing pipeline.

Further, the periphery of the tail end of the main injection pipe is provided with a heater.

Further, the high-temperature gas introduced into the premixing pipeline is high-temperature nitrogen.

Further, the high-temperature high-pressure gas introduced into the injection main pipe is high-temperature high-pressure nitrogen.

Further, the inorganic nano powder is any one or a mixture of several of nano carbon dioxide, nano graphene and nano barium sulfate.

Compared with the prior art, the invention has the following beneficial effects:

1) the inorganic nano powder enters the main spraying pipe through the premixing pipe, is preheated and dispersed by high-temperature gas in the premixing pipe and is pushed into the main spraying pipe, and then the high-temperature high-pressure gas introduced into the main spraying pipe further disperses the inorganic nano powder to ensure that the inorganic nano powder is uniformly sprayed on the surface of the polylactic acid product finally;

2) the inorganic nano powder is subjected to double preheating in the premixing pipeline and the spraying main pipe by high-temperature gas, the temperature of the inorganic nano powder is further increased by a heater arranged at the tail end of the spraying main pipe by the spraying device, and then, the high-temperature inorganic nano powder particles quickly impact the surface of the polylactic acid product to quickly melt part of the polylactic acid material, so that the inorganic nano powder is tightly adhered to the surface of the polylactic acid product.

Drawings

Fig. 1 is a schematic view of the high-barrier polylactic acid spray coating apparatus according to example 1.

Detailed Description

The present invention will be further described with reference to the following detailed description, wherein the drawings are provided for illustrative purposes only and are not intended to be limiting; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.