A manufacturing method of a flame-retardant felt conveyor belt

Abstract

The present invention discloses a manufacturing method of a flame-retardant felt conveyor belt, which comprises the following steps: Step S1: impregnate the felt with a flame-retardant latex; Step S2: dry the felt impregnated with the flame-retardant latex obtained in Step S1 to cure the flame-retardant latex; Step S3: grind one side of the product obtained in Step S2 to be flat and coat the other side with styrene-acrylic latex; Step S4: dry the product obtained in Step S3 to cure the styrene-acrylic latex, thereby obtaining the conveyor belt. The manufacturing method of the present invention is simple and easy to operate, convenient for processing, relatively low in manufacturing cost, easy to scale up production, and the conveyor belt obtained by processing has excellent performance, such as flame retardancy, noise reduction, scratch resistance, impact resistance, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of conveyor belts, and particularly relates to a manufacturing method of a flame-retardant felt conveyor belt. Background Art

[0002] The materials of conveyor belts used in occasions such as logistics parcel transportation and airport luggage transportation generally include PVC or PU. By flame-retardant modification of PVC or PU, the conveyor belt can achieve flame-retardant effect. When flame-retardant PVC is applied in light conveyor belts, it is generally coated on the skeleton layer of the conveyor belt through a scraping technology. However, in the processing process, the interface is prone to delamination. After the TPU material is modified, on the one hand, the material cost increases significantly, and on the other hand, the material performance is greatly reduced. The basic physical properties of the material are reduced by at least 20%, the melt index is low, and the processing performance is poor. In addition, PVC and TPU conveyor belts are mostly of a tight structure, and noise will be generated during use, resulting in noise pollution. Summary of the Invention

[0003] Aiming at the above problems existing in the prior art, the purpose of the present invention is to provide a manufacturing method of a flame-retardant felt conveyor belt. The manufacturing method is simple and easy to operate, convenient for processing, relatively low in manufacturing cost, easy to expand production, and the conveyor belt obtained by processing has excellent performance, and has properties such as flame-retardant, noise reduction, scratch resistance, and impact resistance.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A manufacturing method of a flame-retardant felt conveyor belt includes the following steps:

[0006] Step S1: Immerse the felt in a flame-retardant latex.

[0007] Step S2: Dry the felt impregnated with the flame-retardant latex obtained in step S1 to cure the flame-retardant latex.

[0008] Step S3: Grind one side of the product obtained in step S2 to be flat and coat the other side with styrene-acrylic latex.

[0009] Step S4: Dry the product obtained in step S3 to cure the styrene-acrylic latex to obtain the conveyor belt.

[0010] In step S1, the felt material is PET.

[0011] As a further improvement of the above technical solution:

[0012] In step S1, the felt from bottom to top is a bottom surface, an intermediate fabric, and a top surface. The intermediate fabric is a polyester fabric. The bottom surface and the top surface have the same structure and are both fibers. The fibers of the bottom surface and the top surface are laid into a uniform net shape, and through a needle punching processing method, the upper and lower fiber nets and the polyester industrial fabric are combined into a whole.

[0013] In step S1, the latex formula includes water-based styrene acrylic latex, phosphate flame retardant, melamine and water-based pigment.

[0014] The weight proportions of the various formulas of the latex are: 100 parts of water-based styrene acrylic latex, 10-20 parts of phosphate flame retardant, 1-3 parts of melamine, and 1-3 parts of water-based pigment.

[0015] Phosphate flame retardant is liquid and contains phosphorus ≥19%.

[0016] In step S3, a thickener is added to the styrene acrylic latex, and the viscosity of the styrene acrylic latex after the addition of the thickener is 12000-18000 mPa.s.

[0017] The solid content of the adopted styrene acrylic latex is 45% to 50%.

[0018] The beneficial effects of the present invention are: the production method is simple and easy to operate, convenient to process, the production price is relatively low, easy to expand production, and the conveyor belt obtained by processing has excellent performance, and has flame retardancy, noise reduction, scratch resistance, smash resistance and other properties. DETAILED DESCRIPTION

[0019] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0020] A method for manufacturing a flame-retardant felt conveyor belt comprises the following steps:

[0021] Step S1: impregnating the felt with flame retardant latex.

[0022] In this step, the felt is formed using a needle-punching process. Specifically, the felt comprises three layers from bottom to top: a base, a middle fabric, and a top. The middle fabric is a polyester industrial fabric, and the base and top surfaces have the same fiber structure. The fibers on the base and top surfaces are laid out in a uniform mesh. The needle-punching process tightly integrates the upper and lower fiber meshes and the polyester industrial fabric into a single, integrated whole. The felt is made of PET; that is, the base, middle fabric, and top surfaces are all made of PET.

[0023] In this step, the latex formulation includes a water-based styrene-acrylic latex, a phosphate flame retardant, melamine, and a water-based pigment. The weight ratios of the latex formulations are: 100 parts water-based styrene-acrylic latex, 10-20 parts phosphate flame retardant, 1-3 parts melamine, and 1-3 parts water-based pigment. The mixed slurry is evenly dispersed and set aside for production.

[0024] The phosphate flame retardant used is a liquid high-efficiency phosphate flame retardant with a high phosphorus content, and the phosphorus content is ≥19%. The phosphate flame retardant has good water solubility and is easy to be compatible with water-based latex. Melamine and the high-efficiency phosphate flame retardant have a synergistic effect. Adding a small amount of melamine can greatly improve the flame retardant effect of the latex material.

[0025] In this step, the felt is completely immersed in the flame retardant latex solution for a certain impregnation time to ensure that the latex completely penetrates into the interior of the felt.

[0026] Step S2: Dry the felt impregnated with the flame retardant latex obtained in step S1 to cure the flame retardant latex.

[0027] In this step, the felt impregnated with the flame retardant latex is dried by an oven.

[0028] Step S3: Polish one side of the product obtained in step S2 smoothly and coat the other side with styrene-acrylic latex.

[0029] In this step, the smoothly polished side is the bottom surface of the conveyor belt, and the side coated with styrene-acrylic latex is the surface of the conveyor belt. The bottom surface contacts the sprocket of the conveyor, and the surface directly contacts the conveyed items. The styrene-acrylic latex is styrene-acrylic emulsion. The styrene-acrylic latex has a relatively high solid content, and the solid content of the styrene-acrylic latex is 45% - 50%. Preferably, the solid content is taken as 48%.

[0030] In this step, a thickener is added to the styrene-acrylic latex. The viscosity of the styrene-acrylic latex before adding the thickener is 800 - 1200 mPa·s, and the viscosity of the styrene-acrylic latex after adding the thickener is 12000 - 18000 mPa·s.

[0031] The viscosity of the styrene-acrylic latex needs to be controlled within a certain range and cannot be too low. If the viscosity of the styrene-acrylic latex is too low, it will penetrate into the interior of the felt. When the viscosity of the styrene-acrylic latex is greater than a certain value, it will be beneficial for the styrene-acrylic latex to be coated, so as to form a certain thickness of rubber film on the surface of the conveyor belt, which can protect the surface of the conveyor belt and improve the wear-resistant and impact-resistant characteristics of the conveyor belt surface.

[0032] Step S4: Dry the product obtained in step S3 to cure the styrene-acrylic latex to obtain the conveyor belt.

[0033] Finally, it is necessary to state here: The above embodiments are only used to further illustrate the technical solutions of the present invention and cannot be understood as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all belong to the protection scope of the present invention.

Claims

1. A manufacturing method of a flame-retardant felt conveyor belt, characterized in that, It includes the following steps: Step S1: Impregnate the felt with a flame-retardant latex; the felt is made of PET; Step S2: Dry the felt impregnated with the flame-retardant latex obtained in Step S1 to cure the flame-retardant latex; Step S3: Grind one side of the product obtained in Step S2 to be flat and coat the other side with styrene-acrylic latex; Step S4: Dry the product obtained in Step S3 to cure the styrene-acrylic latex to obtain the conveyor belt; In Step S1, the formula of the latex includes waterborne styrene-acrylic latex, phosphate ester flame retardant, melamine and waterborne pigment. The weight ratio relationship of each formula of the latex is: 100 parts of waterborne styrene-acrylic latex, 10 - 20 parts of phosphate ester flame retardant, 1 - 3 parts of melamine, 1 - 3 parts of waterborne pigment. The phosphate ester flame retardant is liquid and the phosphorus content is ≥19%; In Step S3, a thickener is added to the styrene-acrylic latex, and the viscosity of the styrene-acrylic latex after adding the thickener is 12000 - 18000 mPa·s; the solid content of the styrene-acrylic latex used in Step S3 is 45% - 50%; In Step S1, the felt from bottom to top is the bottom surface, the middle fabric and the top surface. The middle fabric is a polyester fabric. The bottom surface and the top surface have the same structure and are both fibers. The fibers of the bottom surface and the top surface are laid into a uniform net, and the upper and lower fiber nets and the polyester industrial fabric are combined into a whole by the needle punching process.