阅读说明：本技术 一种自控温轻型输送带的制备方法 (Preparation method of self-temperature-control light conveying belt ) 是由 范冰 于 2020-10-20 设计创作，主要内容包括：本发明提供了一种自控温轻型输送带的制备方法,包括如下步骤：步骤a1：对聚酯织物进行干燥和定型；步骤a2：将微胶囊与TPU共混造粒,得到改良后的TPU；步骤a3：将步骤a1得到的聚酯织物表面涂胶；步骤a4：在步骤a3得到的聚酯织物表面压延步骤a2得到的改良后的TPU,得到自控温型输送带,加工完成。本发明无需对聚酯织物骨架进行改进,将改良后的TPU粘接在聚酯织物表面,通过改良后的TPU中的微胶囊进行吸热或放热,实现控温效果,提高使用寿命；微胶囊在TPU中,不与外界接触,不影响输送带的安全性。(The invention provides a preparation method of a self-temperature-control light conveying belt, which comprises the following steps: step a 1: drying and shaping the polyester fabric; step a 2: blending and granulating the microcapsule and the TPU to obtain the improved TPU; step a 3: coating the surface of the polyester fabric obtained in the step a1 with glue; step a 4: and c, calendering the surface of the polyester fabric obtained in the step a3 to obtain the improved TPU obtained in the step a2 to obtain a temperature self-control type conveying belt, and processing the conveying belt to finish the process. According to the invention, the improved TPU is bonded on the surface of the polyester fabric without improving the framework of the polyester fabric, and the microcapsules in the improved TPU absorb or release heat, so that the temperature control effect is realized, and the service life is prolonged; the microcapsule is in the TPU, is not contacted with the outside, and does not influence the safety of the conveying belt.)

1. The preparation method of the self-temperature-control light conveyor belt is characterized by comprising the following steps of:

step a 1: drying and shaping the polyester fabric;

step a 2: blending and granulating the microcapsule and the TPU to obtain the improved TPU;

step a 3: coating the surface of the polyester fabric obtained in the step a1 with glue;

step a 4: and c, calendering the surface of the polyester fabric obtained in the step a3 to obtain the improved TPU obtained in the step a2 to obtain a temperature self-control type conveying belt, and processing the conveying belt to finish the process.

2. The method of claim 1, wherein: in the step a1, the polyester fabric is dried and shaped by far infrared heating, and the drying temperature is 180-200 ℃.

3. The method of claim 1, wherein: in the step a2, the mass content of the microcapsule is 2.5-5%.

4. The method of claim 1, wherein: in the step a2, the microcapsule and TPU are mixed in proportion and added into a double-screw extruder, the temperature of the extruder is set to be 160-180 ℃, and the extrusion amount is 2 KG/h.

5. The method of claim 1, wherein: in the step a3, coating PU glue on the upper surface of the polyester fabric, and drying at 150 ℃.

6. The method of claim 1, wherein: in the step a4, the upper surface of the polyester fabric is calendered, the extrusion temperature of the calendered improved TPU is 200-210 ℃, the thickness is 0.3mm, the composite pressure is 15-20 Pa, and the cloth cover temperature of the polyester fabric is kept at 130-150 ℃ in the calendering process.

7. The method of claim 1, wherein: step a1, step a3 and step a4 were performed sequentially, with step a2 being before step a 4.

8. The method of claim 1, wherein: the microcapsule comprises a shell and a core, wherein the shell is melamine, the core is a phase-change material, and the microcapsule is formed by coating the shell outside the core.

9. The method of claim 8, wherein: at the temperature of 90-110 ℃, the phase change material in the microcapsule generates phase change from liquid state to gas state, and absorbs external heat; at 30-50 deg.C, the phase-change material changes from gas state to liquid state, releasing the absorbed heat.

10. The method of claim 8, wherein: the microcapsule size is 100-120 microns, and the shell thickness is 20-30 microns.

Technical Field

The invention relates to the technical field of conveying belts in the food industry, in particular to a preparation method of a self-temperature-control light conveying belt.

Background

The conveyor belt is widely applied to the food processing industry, for example, a PU light conveyor belt generally takes polyester fabric as a framework material and is mainly used for conveying light and medium-quality articles. The PU (polyurethane) light conveyor belt has the advantages of light weight, long service life, convenience in installation, difficulty in friction and the like, and is widely applied to industries of food baking and the like. However, baked food generally has a certain temperature after being taken out of the oven, and the conventional PU conveyor belt has poor temperature resistance, so that the aging of the conveyor belt can be accelerated when high-temperature objects are transported, the PU and the polyurethane framework are separated and cracked, and the use of the conveyor belt is adversely affected. Meanwhile, the heat capacity of PU is low, and the temperature resistance of PU is limited.

In the prior art, the conventional method is to use temperature-resistant glue instead of conventional PU glue as a bonding material of PU and polyester fabric, but even the temperature-resistant glue is aged and degraded in the use process, and the temperature resistance of the conveyer belt cannot be fundamentally improved.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a preparation method of a self-temperature-control light conveyor belt, which is characterized in that a polyester fabric framework is not required to be improved, an improved TPU is bonded to the surface of a polyester fabric, and heat absorption or heat release is carried out through microcapsules in the improved TPU, so that the temperature control effect is realized, and the service life is prolonged; the microcapsule is in the TPU, is not contacted with the outside, and does not influence the safety of the conveying belt.

In order to achieve the purpose, the invention adopts the technical scheme that:

a preparation method of a self-temperature-control light conveying belt comprises the following steps:

step a 1: drying and shaping the polyester fabric;

step a 2: blending and granulating the microcapsule and the TPU to obtain the improved TPU;

step a 3: coating the surface of the polyester fabric obtained in the step a1 with glue;

step a 4: and c, calendering the surface of the polyester fabric obtained in the step a3 to obtain the improved TPU obtained in the step a2 to obtain a temperature self-control type conveying belt, and processing the conveying belt to finish the process.

As a further improvement of the above technical solution:

in the step a1, the polyester fabric is dried and shaped by far infrared heating, and the drying temperature is 180-200 ℃.

In the step a2, the mass content of the microcapsule is 2.5-5%.

In the step a2, the microcapsule and TPU are mixed in proportion and added into a double-screw extruder, the temperature of the extruder is set to be 160-180 ℃, and the extrusion amount is 2 KG/h.

In the step a3, coating PU glue on the upper surface of the polyester fabric, and drying at 150 ℃.

In the step a4, the upper surface of the polyester fabric is calendered, the extrusion temperature of the calendered improved TPU is 200-210 ℃, the thickness is 0.3mm, the composite pressure is 15-20 Pa, and the cloth cover temperature of the polyester fabric is kept at 130-150 ℃ in the calendering process.

Step a1, step a3 and step a4 were performed sequentially, with step a2 being before step a 4.

The microcapsule comprises a shell and a core, wherein the shell is melamine, the core is a phase-change material, and the microcapsule is formed by coating the shell outside the core.

At the temperature of 90-110 ℃, the phase change material in the microcapsule generates phase change from liquid state to gas state, and absorbs external heat; at 30-50 deg.C, the phase-change material changes from gas state to liquid state, releasing the absorbed heat.

The microcapsule size is 100-120 microns, and the shell thickness is 20-30 microns.

Compared with the prior art, the invention has the beneficial effects that: the improved TPU is bonded on the surface of the polyester fabric without improving the framework of the polyester fabric, the temperature control effect is realized by absorbing or releasing heat through microcapsules in the improved TPU, a heat absorption temperature section and a heat release temperature section are set according to the performance of the conveyer belt, and the core of the microcapsule is determined according to the temperature requirement, so that the conveyer belt absorbs and releases heat in the heat absorption temperature section and the heat release temperature section respectively in the use process, the lower temperature of the conveyer belt is automatically kept, and the service life of the conveyer belt is prolonged; the microcapsule is in the TPU, is not contacted with the outside, and does not influence the safety of the conveying belt.

Detailed Description

The method for preparing the self-temperature-control light conveyor belt provided by the invention is further described in detail and completely by combining the embodiment. The following examples are illustrative only and are not to be construed as limiting the invention.

A preparation method of a self-temperature-control light conveying belt comprises the following steps:

step a 1: drying and shaping the polyester fabric;

step a 2: blending and granulating the microcapsule and the TPU to obtain the improved TPU;

step a 3: coating the surface of the polyester fabric obtained in the step a1 with glue;

step a 4: and c, calendering the surface of the polyester fabric obtained in the step a3 to obtain the improved TPU obtained in the step a2 to obtain a temperature self-control type conveying belt, and processing the conveying belt to finish the process.

TPU is short for Thermoplastic Urethane, the name of which is Thermoplastic polyurethane elastomer.

In the step a1, the polyester fabric is dried and shaped by far infrared heating, and the drying temperature is between 180 and 200 ℃.

In the step a2, the mass content of the microcapsule is 2.5-5%, and the mass content of the TPU is 95-97.5%.

The blending process in step a2 is: mixing the microcapsule and TPU in proportion, adding the mixture into a double-screw extruder, setting the temperature of the extruder to be 160-180 ℃, and setting the extrusion amount to be 2 KG/h.

In the step a3, coating PU glue on the upper surface of the polyester fabric, drying after coating the glue, and drying at the temperature of 150 ℃.

In the step a4, the upper surface of the polyester fabric is calendered, the extrusion temperature of the calendered improved TPU is 200-210 ℃, the thickness is 0.3mm, the composite pressure is 15-20 Pa, and the cloth cover temperature of the polyester fabric is kept at 130-150 ℃ in the calendering process.

It should be noted that, the step a1, the step a3 and the step a4 are performed sequentially, and the step a2 is just before the step a 4.

At 90-110 ℃, the phase change material in the microcapsule generates phase change from liquid state to gas state, and absorbs external heat, so that the conveyor belt body keeps lower temperature; at 30-50 deg.C, the phase change material changes from gaseous state to liquid state, releasing the absorbed heat, and preparing for absorbing heat again.

The microcapsule comprises a shell and a core, wherein the core is made of a phase-change material, and the shell is formed by coating the phase-change material. The shell is melamine. The inner core of the microcapsule comprises one dodecane derivative or a plurality of dodecane derivatives. That is, the phase change material is a dodecane derivative, including but not limited to: dodecyl dimethyl amine oxide, dodecyl dimethyl tertiary amine, dodecylamine, N, N-dimethyl dodecylamine-N-oxide, hydroquinone dihydroxyethyl ether, hexamidine diisethylenesulfonate, sodium dodecyl benzene sulfonate. The core of the microcapsule comprises one or more phase-change materials, and the microcapsules with the heat absorption and release performances are obtained by mixing the phase-change materials in any proportion in the prior art.

The microcapsule has an outer diameter of 100-120 microns and a shell thickness of 20-30 microns.

The working principle of the invention is as follows: the phase-change material can perform phase-change behavior at a certain temperature, such as changing from a solid state to a liquid state and changing from the liquid state to a gas state, and can absorb a large amount of heat in the phase-change process, so that the ambient temperature is reduced. This technical scheme is through adding phase change material to the PU conveyer belt in, through phase change material's phase transition, absorbs or releases the heat to the temperature that makes the conveyer belt maintains in the level that needs. At a high-temperature working section (90-110 ℃), the phase-change material in the microcapsule generates phase change from liquid state to gas state, and absorbs external heat, so that the conveying belt body is kept at a lower temperature; in the cooling section (30-50 ℃), the phase change material changes from the gaseous state back to the liquid state, releasing the absorbed heat in preparation for re-absorption.

Finally, it must be said here that: the above embodiments are only used for further detailed description of the technical solutions of the present invention, and should not be understood as limiting the scope of the present invention, and the insubstantial modifications and adaptations made by those skilled in the art according to the above descriptions of the present invention are within the scope of the present invention.