Preparation method of novel synthetic leather particles
By sorting, drying, crushing and forming synthetic leather scraps, efficient synthetic leather particles are prepared, which solves the problem that synthetic leather scraps are difficult to reuse, improves the reuse value and reduces resource waste and environmental pollution.
Patent Information
- Application Number
- CN202411356477.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-01-03
AI Technical Summary
The scraps produced by synthetic leather during processing are difficult to reuse, resulting in waste of resources and environmental pollution, and serious waste of storage space.
Formed synthetic leather particles are prepared by sorting, drying, crushing, metal separation and molding, and improved performance with catalysts and chain extenders, and increased reuse value and reduced pollution through multi-step processing.
Maximize the reuse value of synthetic leather, reduce resource waste and environmental pollution, and have no harmful by-products in the production process. The products are granular in shape for easy storage and transportation.
Smart Images
Figure CN119238770A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of synthetic leather, and in particular relates to a method for preparing novel synthetic leather particles. Background Art
[0002] Synthetic leather is a plastic product that imitates the characteristics and structure of natural leather. Synthetic leather is very similar to real leather in appearance and feel, and even has a certain degree of breathability, making it closer to natural leather than ordinary artificial leather. Synthetic leather is widely used in the manufacture of products such as shoes, bags, and sporting goods due to its superior performance and economy. During the processing of synthetic leather, it is necessary to cut the synthetic leather, which produces a lot of scraps. The scraps and finished products of synthetic leather are difficult to collect and reprocess. Most of them are currently piled up in the form of solid waste. The scraps of synthetic leather are mostly irregular in shape, which wastes a lot of storage space when stacking and bundling, and it is also very difficult to take them out for repeated use, which greatly limits the reuse value of synthetic leather products and also causes waste of resources and environmental pollution. Summary of the invention
[0003] The purpose of the present invention is to provide a method for preparing novel synthetic leather particles to solve the problems raised in the above background technology.
[0004] To achieve the above object, the present invention provides the following technical solution: a method for preparing novel synthetic leather particles, comprising:
[0005] S1: sorting raw materials into synthetic leather materials;
[0006] S2: placing the synthetic leather material in a hot air oven at a temperature of 60° to 100° for drying for 4h to 8h;
[0007] S3: putting the dried synthetic leather material into a crusher to obtain a fragment mixture, wherein the size of the fragment mixture ranges from 0.1 cm to 5.9 cm;
[0008] S4: placing the debris mixture into a metal separation device to remove metal from the debris mixture;
[0009] S5: putting the fragment mixture into a molding machine, setting the heating temperature of the molding machine to 100° to 300°, extruding and cutting to form synthetic leather particles.
[0010] Preferably, the S3 further comprises: simultaneously adding a catalyst and / or a chain extender: 0.01% to 10.00%.
[0011] Preferably, the catalyst is diethanolamine or triethanolamine or a bismuth catalyst or a platinum catalyst.
[0012] Preferably, the chain extender is ethylene glycol or butanediol or diisocyanate.
[0013] Preferably, S5 further comprises: after the synthetic leather particles are formed by the molding machine, the synthetic leather particles are placed in a hot air oven, the temperature of the hot air oven is 60° to 150°, and the particles are dried for 4h to 8h.
[0014] Preferably, the step S1 further comprises: placing the synthetic leather material into a cleaning device to clean dust from the synthetic leather material, and then placing the synthetic leather material into a centrifugal dehydrator for dehydration.
[0015] Preferably, the hot air oven is provided with a tumbling device, and during the process of drying the synthetic leather material, the tumbling device tumbles the synthetic leather material.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] The present invention obtains synthetic leather particles by sorting, drying, removing metal, crushing and forming. By sorting out different types of synthetic leather materials, various types of synthetic leather particles are made to maximize the reuse value of synthetic leather. The synthetic leather particles are easy to pack and store, which reduces the use of storage space, improves the reuse value of synthetic leather, and reduces resource waste and environmental pollution.
[0018] The present invention does not produce any unnecessary, harmful by-products and toxic substances during the production process, thus meeting the requirements of safe production. Meanwhile, the final product is a granular substance, which has no special requirements and is convenient for storage, transportation and further production operations. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] Embodiment 1:
[0022] like Figure 1The present invention provides a method for preparing a novel synthetic leather particle, comprising: S1: sorting the raw materials into synthetic leather materials; S2: placing the synthetic leather materials in a hot air oven at a temperature of 60° to 100° and drying for 4h to 8h; S3: placing the dried synthetic leather materials into a crusher to obtain a fragment mixture, the size range of the fragment mixture is 0.1cm to 5.9cm; S4: placing the fragment mixture into a metal separation device to remove metals in the fragment mixture; S5: placing the fragment mixture into a molding machine, setting the molding machine heating temperature to 100° to 300°, extruding and cutting to form synthetic leather particles. S3 also includes: adding a catalyst and / or a chain extender at the same time: 0.01% to 10.00%. The catalyst is diethanolamine or triethanolamine or a bismuth catalyst or a platinum catalyst. The chain extender is ethylene glycol or butanediol or diisocyanate. S5 also includes: after the synthetic leather particles are formed by the molding machine, the synthetic leather particles are placed in a hot air oven, the temperature of the hot air oven is 60° to 150°, and the drying is carried out for 4h to 8h. S1 also includes: placing the synthetic leather material in a cleaning device, cleaning the dust of the synthetic leather material, and then placing the synthetic leather material in a centrifugal dehydrator for dehydration. The hot air oven is provided with a tumbling device, and during the drying process of the synthetic leather material, the tumbling device tumbles the synthetic leather material.
[0023] Through the above technical scheme, the present invention obtains synthetic leather particles by sorting, drying, removing metal, crushing and forming, and makes various types of synthetic leather particles by sorting out different types of synthetic leather materials, thereby maximizing the reuse value of synthetic leather. The synthetic leather particles are easy to pack and store, which reduces the use of storage space, improves the reuse value of synthetic leather, and reduces resource waste and environmental pollution.
[0024] The present invention does not produce any unnecessary, harmful by-products and toxic substances during the production process, thus meeting the requirements of safe production. Meanwhile, the final product is a granular substance, which has no special requirements and is convenient for storage, transportation and further production operations.
[0025] Embodiment 2:
[0026] like Figure 1 The first step of the present invention is to sort the raw materials (containing various types of synthetic leather scraps and other debris) manually or automatically, remove the debris and classify the synthetic leather scraps according to different types or colors to obtain various types of synthetic leather materials, so as to facilitate the production of different types of synthetic leather particles and improve the reuse value of synthetic leather scraps.
[0027] During the collection, transportation and storage of synthetic leather materials, dust (or dirt) is mixed in, and it needs to be cleaned to ensure the quality of the synthetic leather particles. The synthetic leather materials are placed in a cleaning device and cleaned with clean water to clean the dust (or dirt) on the synthetic leather materials and improve the quality of the synthetic leather particles.
[0028] After cleaning, the material usually has a lot of water left. This water will not only affect the subsequent processing technology, but also affect the quality of synthetic leather particles. Dehydration is required. The synthetic leather material is placed in a centrifugal dehydrator for dehydration. The centrifugal force generated by high-speed rotation is used to quickly separate the water from the synthetic leather material.
[0029] The synthetic leather material after dehydration by the centrifugal dehydrator needs to be dried.
[0030] Step 2: Place the classified synthetic leather materials in a hot air oven at a temperature of 60° to 100° for 4 to 8 hours. A tumbling device is provided inside the hot air oven. During the drying process, the tumbling device slowly and continuously tumbles the synthetic leather materials to prevent the undried synthetic leather materials from adhering together (because the synthetic leather materials still contain moisture and adsorb and adhere). The tumbling device loosens the synthetic leather materials, thereby improving the drying effect of the synthetic leather materials and shortening the drying time.
[0031] The dried synthetic leather material needs to be crushed for easy molding.
[0032] Step 3: Put the dried synthetic leather material into a crusher to obtain a fragment mixture, and control the size range of the fragment mixture to be 0.1 cm to 5.9 cm by controlling the rotation speed and crushing time of the crusher.
[0033] Step 4: Place the debris mixture into a metal separation device to remove metal from the debris mixture; metallic foreign matter will affect the recycling process of synthetic leather particles and reduce the quality of synthetic leather reproduced from synthetic leather particles. The metallic foreign matter in the debris mixture is removed by the metal separation device to improve the quality of synthetic leather particles.
[0034] Step 5: Put the fragment mixture into a molding machine, set the heating temperature of the molding machine to 100°~300°, heat the fragment mixture to melt, and facilitate extrusion by the molding machine. At the same time, set the heating temperature of the molding machine to 100°~300° to improve the catalytic efficiency of the catalyst and the reaction speed of the chain extender, and improve the mechanical physical properties and durability of the synthetic leather particles. After the molding machine extrude the melted fragment mixture, it is a strip-shaped synthetic leather, which needs to be hardened by low-temperature cooling, and then the strip-shaped synthetic leather is cut into small particles by a cutting device, i.e., new synthetic leather particles.
[0035] After the synthetic leather particles are formed by the molding machine, in order to ensure the drying of the synthetic leather particles, the synthetic leather particles need to be placed in a hot air oven with a temperature of 60° to 150° and dried for 4h to 8h to remove the moisture from the synthetic leather particles. After the synthetic leather particles are cooled, they are packaged by a baler.
[0036] Embodiment three:
[0037] like Figure 1 Synthetic leather is a plastic product that imitates natural leather and is widely used in industries such as footwear, luggage, and sporting goods. During the processing of synthetic leather, a large amount of scraps are often produced. These scraps are often regarded as solid waste due to their irregular shapes and difficulty in recycling, resulting in resource waste and environmental pollution. Therefore, developing a new method for preparing synthetic leather particles to convert synthetic leather scraps into reusable particles has important economic and environmental significance.
[0038] The first step of the preparation method of the novel synthetic leather particles is to sort the raw materials. The raw materials include various types of synthetic leather scraps and various sundries. The sundries can be removed by manual or automated equipment sorting, and the synthetic leather scraps can be classified according to different types or colors. This process obtains various types of synthetic leather materials, which is convenient for subsequent production operations, thereby increasing the reuse value of synthetic leather scraps.
[0039] During the collection, handling and storage process, synthetic leather materials are easily contaminated by dust or dirt, so they need to be cleaned. Put the synthetic leather materials into the cleaning device and use clean water to clean them to ensure that the quality of the materials will not be affected when preparing synthetic leather particles later. The cleaning process can effectively remove dust and dirt on the surface of the materials, improve the quality of synthetic leather particles, and lay a good foundation for the subsequent processing stage.
[0040] However, the washed materials often have a lot of residual water, which will affect the subsequent processing technology and reduce the quality of synthetic leather particles. Therefore, dehydration is required. Put the synthetic leather material into a centrifugal dehydrator, and use the centrifugal force generated by high-speed rotation to quickly separate the water from the synthetic leather material, ensuring that the material is in an ideal dry state in the subsequent processing links.
[0041] After dehydration, synthetic leather materials need to go through a drying process. Place the sorted synthetic leather materials in a hot air oven, set the oven temperature between 60° and 100°, and continue drying for 4 to 8 hours. During the drying process, the tumbling device in the oven will continuously flip the synthetic leather materials to prevent the materials from sticking together due to residual moisture. The design of the tumbling device keeps the materials loose during the drying process, thereby improving the drying effect and shortening the drying time.
[0042] After the drying treatment, the synthetic leather material needs to be crushed to facilitate the subsequent molding process. The dried synthetic leather material is placed in a crusher, and the speed and crushing time of the crusher will be controlled to achieve the ideal fragment size range. Adding an appropriate amount of catalyst or chain extender can help improve the performance of synthetic leather particles. Catalysts can promote the chemical reaction between polyols and isocyanates, help form polyurethane polymers, and enhance the elasticity of synthetic leather particles. Commonly used catalysts include diethanolamine, triethanolamine, and other bismuth or platinum catalysts, which will significantly increase the reaction rate and promote the further reaction. At the same time, the use of chain extenders helps to increase the length of the polymer molecular chain and improve the physical properties of synthetic leather particles, such as tensile strength, wear resistance and elasticity. Commonly used chain extenders include ethylene glycol, butanediol or diisocyanate.
[0043] During the crushing process, the mixture of fragments is first sent to the metal separation device to remove metal foreign matter in the mixture of fragments. Metal foreign matter will affect the recycling process of synthetic leather particles and reduce the quality of synthetic leather. The use of the metal separation device can effectively ensure the purity of synthetic leather particles, thereby improving the overall quality of synthetic leather particles prepared subsequently.
[0044] The impurity-free mixture of chips is placed in the molding machine and the heating temperature is set to 100° to 300°. The mixture of chips is melted by heating and then formed into strip-shaped synthetic leather through the extrusion system of the molding machine. The appropriate temperature setting not only helps to accelerate the melting speed of the material, but also improves the catalytic efficiency of the catalyst and the reaction speed of the chain extender, thereby improving the physical properties and durability of the final synthetic leather particles.
[0045] The strip-shaped synthetic leather obtained after extrusion will be cooled at low temperature to harden it, and then cut into small particles by a cutting device to complete the formation of new synthetic leather particles. After the synthetic leather particles are formed by the molding machine, in order to ensure the dryness of the particles, they need to be placed in a hot air oven for drying again. The temperature is set between 60° and 150° and the drying is continued for 4 to 8 hours to ensure that the moisture of the synthetic leather particles is completely removed. After the particles are cooled to room temperature, the synthetic leather particles are packaged by a packaging machine to prepare for subsequent use and sales.
[0046] Through the above preparation method, synthetic leather scraps and debris are classified, cleaned, dehydrated, dried, crushed, metal separated, and made into high-quality synthetic leather particles, which greatly improves the reuse value of synthetic leather scraps and reduces resource waste and environmental pollution. Through this series of processing steps, the production of synthetic leather not only embodies the concept of environmental protection, but also provides new solutions and implementation methods for the sustainable development of the industry.
[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0048] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.
Claims
1. A method for preparing novel synthetic leather particles, characterized in that: include: S1: sorting raw materials into synthetic leather materials; S2: placing the synthetic leather material in a hot air oven at a temperature of 60° to 100° for drying for 4h to 8h; S3: putting the dried synthetic leather material into a crusher to obtain a fragment mixture, wherein the size of the fragment mixture ranges from 0.1 cm to 5.9 cm; S4: placing the debris mixture into a metal separation device to remove metal from the debris mixture; S5: putting the fragment mixture into a molding machine, setting the heating temperature of the molding machine to 100° to 300°, extruding and cutting to form synthetic leather particles.
2. The method for preparing the novel synthetic leather particles according to claim 1, characterized in that: The S3 further comprises: simultaneously adding a catalyst and / or a chain extender: 0.01% to 10.00%.
3. The method for preparing the novel synthetic leather particles according to claim 2, characterized in that: The catalyst is diethanolamine or triethanolamine or a bismuth catalyst or a platinum catalyst.
4. The method for preparing a novel synthetic leather particle according to claim 2, characterized in that: The chain extender is ethylene glycol or butanediol or diisocyanate.
5. The method for preparing novel synthetic leather particles according to claim 1, characterized in that: The S5 further comprises: after the synthetic leather particles are formed by the molding machine, the synthetic leather particles are placed in a hot air oven at a temperature of 60° to 150° and dried for 4h to 8h.
6. The method for preparing novel synthetic leather particles according to claim 1, characterized in that: The step S1 further includes: placing the synthetic leather material into a cleaning device to clean the dust on the synthetic leather material, and then placing the synthetic leather material into a centrifugal dehydrator for dehydration.
7. The method for preparing novel synthetic leather particles according to claim 1, characterized in that: The hot air drying oven is provided with a tumbling device, and during the process of drying the synthetic leather material, the tumbling device tumbles the synthetic leather material.