XPE foam material and processing technology thereof
By adopting uniform mixing, constant extrusion and controlled cooling processes in the production of XPE foaming materials, the material defects caused by uneven temperature and excessive cooling are solved, the strength and weather resistance of the materials are improved, and efficient production is achieved process.
Patent Information
- Application Number
- CN202411484423.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-01-07
AI Technical Summary
During the production process of traditional XPE foamed materials, uneven temperature and excessive cooling lead to material defects, such as cracks, which affect the quality and production efficiency of the final product.
The process flow of uniform mixing, constant extrusion speed and pressure, appropriate cooling is adopted, combined with melt extrusion and crosslinking reactions, and physical or chemical foaming agents are used to control the temperature and cooling speed to ensure the uniformity of the material and the forming quality.
The tensile strength, compressive strength and weather resistance of XPE foamed materials are improved, and the excellent physical properties and efficient production process of the materials are ensured, suitable for industrial production, and avoid degradation of material performance.
Smart Images
Figure CN119264544A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of XPE foaming materials, and in particular relates to an XPE foaming material and a processing technology thereof. Background Art
[0002] XPE foam material is a foam material generated by cross-linking polyethylene. Due to its excellent physical and chemical properties, XPE materials are widely used in construction, automobiles, electronics, packaging and sports equipment. XPE foam materials usually have excellent thermal insulation, shock absorption, corrosion resistance and good mechanical strength, and can maintain stable performance under different environmental conditions. The development of foaming technology provides more possibilities for the production of XPE materials. Traditional physical foaming and chemical foaming methods are widely used in the production process of XPE. Physical foaming agents produce bubbles through physical changes, while chemical foaming agents release gases through chemical reactions. The combination of these technologies optimizes the density, structure and performance of foamed materials. Summary of the invention
[0003] The purpose of the present invention is to solve the problem of improving the efficiency of the production process and ensuring the uniformity and molding quality of the material through detailed processing steps, including mixing, melt extrusion, cooling, etc. Maintaining a constant extrusion speed and pressure and an appropriate cooling method avoids material defects (such as cracks) caused by uneven temperature or too fast cooling, thereby improving the quality of the final product.
[0004] The present invention achieves the above-mentioned purpose through the following technical scheme: The present invention provides an XPE foam material and a processing technology thereof, the process comprising the following steps: The material is composed of the following components by weight percentage: Polyethylene (PE): 50%-80% Crosslinking agent: 0.5%-5% Foaming agent: 3%-10% Additives: 1%-5% Filler: 10%-40%; Wherein, the cross-linking agent is one of peroxide, silane and nitride, and the foaming agent is a physical foaming agent or a chemical foaming agent.
[0005] Furthermore, the polyethylene is low-density polyethylene (LDPE), high-density polyethylene (HDPE) or a mixture thereof, and the density of the material is 20-200 kg / m³, the tensile strength is 0.3-1.5 MPa, and the compressive strength is 0.5-2.0 MPa.
[0006] Furthermore, the auxiliary agent is one of an antioxidant, an ultraviolet absorber or a flame retardant, and the amount of the auxiliary agent added is determined according to the final application and performance requirements of the material to improve the weather resistance and safety of the material.
[0007] Further, step 1: uniformly mixing polyethylene, a cross-linking agent, a foaming agent, an auxiliary agent and a filler according to the proportion of claim 1, ensuring that each component is fully dispersed to form a uniform mixture; Step 2: Perform preliminary mixing at room temperature by mechanical stirring or using a high shear mixer for 10-30 minutes to ensure the uniformity of the material; Step 3: Heat the mixture to 120-200°C and perform melt extrusion. The temperature is set to 150-180°C to promote the fluidity of polyethylene and the cross-linking reaction. Step 4: During the melt extrusion process, maintain a constant extrusion speed and pressure to ensure that the mixture flows out evenly, and use a mold to mold the molten material into the desired foam shape. Step 5: Cool the extruded foaming material to room temperature. Cooling can be done by water cooling or air cooling to improve the molding quality and surface smoothness of the material.
[0008] Furthermore, during the melt extrusion process, a pre-prepared cross-linking agent is added to the mixture, and a certain temperature is maintained for a cross-linking reaction, and the cross-linking reaction time is 1-10 minutes to ensure sufficient cross-linking and improve the mechanical properties and heat resistance of the material.
[0009] Furthermore, the temperature of the mixture in a molten state is rapidly reduced by a cooling system to prevent excessive cross-linking from causing degradation of material properties. The cooling medium is water or air, and the cooling time is 2-5 minutes.
[0010] Furthermore, the cooling step includes natural cooling or water cooling, and the water temperature during water cooling should be controlled between 20-30°C to prevent cracks on the material surface caused by excessive cooling.
[0011] Furthermore, the mixture may be pretreated before heating, including drying the polyethylene to remove moisture and ensure the stability of the mixture.
[0012] Beneficial effects: 1. Excellent physical properties: Through the reasonable proportion of polyethylene, cross-linking agent and filler, the obtained XPE foam material has good tensile strength (0.3-1.5 MPa) and compressive strength (0.5-2.0 MPa), and can show excellent pressure resistance and durability in a variety of application scenarios. This makes the material suitable for industries such as construction, automobiles and packaging, meeting their needs for material strength and toughness.
[0013] 2. Enhanced weather resistance and safety: Adding additives such as antioxidants, UV absorbers and flame retardants can significantly improve the weather resistance of the material, extend its service life, and reduce the risk of high temperature or fire conditions. This makes the material more adaptable in outdoor and high safety environments. 3. Efficient production process: The processing technology ensures the uniformity and molding quality of the material through melt extrusion, cross-linking reaction and appropriate cooling steps. In particular, temperature control during the cross-linking reaction and cooling process helps to avoid excessive cross-linking and ensure that the performance of the material does not decrease. The production process is simple and efficient, suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION
[0015] 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. Figure 1 A point pressure test method for an inflatable mattress is shown, comprising the following steps: Step 1: Evenly mix polyethylene, a cross-linking agent, a foaming agent, an additive and a filler according to the proportion of claim 1 to ensure that each component is fully dispersed to form a uniform mixture; Step 2: Perform preliminary mixing at room temperature by mechanical stirring or using a high shear mixer for 10-30 minutes to ensure the uniformity of the material; Step 3: Heat the mixture to 120-200°C and perform melt extrusion. The temperature is set to 150-180°C to promote the fluidity of the polyethylene and the cross-linking reaction; Step 4: During the melt extrusion process, maintain a constant extrusion speed and pressure to ensure that the mixture flows out evenly, and use a mold to shape the molten material into the desired foam shape; Step 5: Cool the extruded foamed material to room temperature. Cooling can be performed by water cooling or air cooling to improve the molding quality and surface smoothness of the material.
[0016] Material preparation: Low-density polyethylene (LDPE): 70% 70% Cross-linking agent (peroxide): 2% 2% Physical foaming agent (such as carbon dioxide): 5% 5% Antioxidant (auxiliary agent): 2% 2% Calcium carbonate (filler): 21% Steps: 1. Pretreatment: Dry 70% of LDPE at 80°C for 2 hours to remove moisture. 2. Mixing: In a mixing device, mix the above components in proportion to ensure uniform dispersion to form a uniform mixture. The mixing time is 20 minutes. 3. Heating and extrusion: Heat the mixture to 160°C and then extrude it through a melt extrusion device. Ensure that the extrusion speed is constant to form a foam sheet. 4. Cooling: The extruded foam sheet is cooled to room temperature through a water cooling system, and the water temperature is controlled at 25°C to improve the molding quality and surface smoothness. 5. Cutting and post-processing: Cut the cooled foam sheet into the required size and perform surface treatment to increase the weather resistance and aesthetics of the material. Performance test: The density of the material was measured to be 40 kg / m³, the tensile strength was 0.8 MPa, and the compressive strength was 1.2 MPa, which met the design requirements. Example 2: Material preparation: High-density polyethylene (HDPE): 60% Silane crosslinker: 1% Chemical foaming agent (such as azodicarbonamide) 7%: UV absorber (auxiliary agent): 3% Bauxite (filler): 29%; Steps: 1. Pretreatment: Dry the HDPE at 90°C for 1.5 hours to remove moisture. 2. Mixing: Mix the components in a high shear mixer for 30 minutes to ensure that the components are evenly distributed. 3. Heating and extrusion: Heat the mixture to 180°C for melt extrusion, and keep the temperature at 175°C. 4. Crosslinking: During the extrusion process, the crosslinking agent reacts at this temperature for 5 minutes to ensure that the crosslinking reaction is sufficient. 5. Cooling: The foaming material is quickly cooled to room temperature through an air cooling system to ensure the stability of the foam. 6. Molding and testing: The molded material is subjected to physical property tests to check its compressive and tensile properties. Performance test: The test results show that the material has a density of 50 kg / m³, a tensile strength of 1.0 MPa, and a compressive strength of 1.5 MPa, which meets the expected application requirements. Example 3: Material preparation: Polyethylene mixture (LDPE and HDPE): 75% Nitride cross-linking agent: 1.5% Physical foaming agent (nitrogen): 4% Flame retardant (auxiliary agent): 2% Mineral filler (such as quartz sand): 17.5% Steps: 1. Pretreatment: Dry the polyethylene mixture at a temperature of 85°C for 2 hours. 2. Mixing: Mix all components in proportion by mechanical stirring for 15 minutes. 3. Heating and extrusion: Heat the mixture to 150°C and perform melt extrusion, maintaining the temperature at 160°C. 4. Cooling and curing: Cool the extruded material to room temperature by a combination of water cooling and air cooling to ensure that its performance is not affected.5. Quality inspection: The final product is tested for properties such as density, tensile strength and compressive strength. Performance test: The test results show that the material has a density of 30 kg / m³, a tensile strength of 0.6 MPa and a compressive strength of 0.8 MPa, which meets the corresponding use standards. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.
[0017] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. An XPE foam material and a processing technology thereof, characterized in that: The material consists of the following components by weight: Polyethylene (PE): 50%-80% Crosslinking agent: 0.5%-5% Foaming agent: 3%-10% Additives: 1%-5% Filler: 10%-40%; Wherein, the cross-linking agent is one of peroxide, silane and nitride, and the foaming agent is a physical foaming agent or a chemical foaming agent.
2. The XPE foam material and processing technology thereof according to claim 1, characterized in that: The polyethylene is low-density polyethylene (LDPE), high-density polyethylene (HDPE) or a mixture thereof, and the density of the material is 20-200 kg / m³, the tensile strength is 0.3-1.5 MPa, and the compressive strength is 0.5-2.0 MPa.
3. The XPE foam material and processing technology thereof according to claim 2, characterized in that: The auxiliary agent is one of an antioxidant, an ultraviolet absorber or a flame retardant, and the amount of the auxiliary agent added is determined according to the final application and performance requirements of the material to improve the weather resistance and safety of the material.
4. The XPE foam material and processing technology thereof according to claim 3, characterized in that: The steps include: Step 1: uniformly mix polyethylene, cross-linking agent, foaming agent, additive and filler according to the proportion of claim 1, ensuring that each component is fully dispersed to form a uniform mixture; Step 2: Preliminary mixing is performed at room temperature by mechanical stirring or using a high shear mixer for 10-30 minutes to ensure the uniformity of the material; Step 3: Heat the mixture to 120-200°C and perform melt extrusion. The temperature is set to 150-180°C to promote the fluidity of polyethylene and the cross-linking reaction. Step 4: During the melt extrusion process, maintain a constant extrusion speed and pressure to ensure that the mixture flows out evenly, and use a mold to mold the molten material into the desired foam shape. Step 5: Cool the extruded foaming material to room temperature. Cooling can be done by water cooling or air cooling to improve the molding quality and surface smoothness of the material.
5. The XPE foam material and processing technology thereof according to claim 4, characterized in that: During the melt extrusion process, a pre-prepared cross-linking agent is added to the mixture, and a certain temperature is maintained for a cross-linking reaction. The cross-linking reaction time is 1-10 minutes to ensure sufficient cross-linking and improve the mechanical properties and heat resistance of the material.
6. The XPE foam material and processing technology thereof according to claim 5, characterized in that: The temperature of the mixture in the molten state is quickly reduced by the cooling system to prevent excessive cross-linking from causing a decrease in material properties. The cooling medium is water or air, and the cooling time is 2-5 minutes.
7. The XPE foam material and the processing technology thereof according to claim 6, characterized in that: The cooling step includes natural cooling or water cooling. During water cooling, the water temperature should be controlled between 20-30°C to prevent cracks on the material surface caused by excessive cooling.
8. The XPE foam material and processing technology thereof according to claim 7, characterized in that: The mixture may be pretreated before heating, including drying the polyethylene to remove moisture and ensure the stability of the mixture.