Broken bridge aluminum profile connecting structure

Abstract

The invention relates to the technical field of aluminum profiles, and discloses a broken bridge aluminum profile connecting structure which comprises a first composite alloy connecting piece used for connecting a first aluminum alloy frame and a second aluminum alloy frame and a second composite alloy connecting piece used for connecting a third aluminum alloy frame and a fourth aluminum alloy frame. A first aluminum alloy core body is arranged in the middle of the inner side of the first composite alloy connecting piece through an aluminum-plastic co-extrusion process, and first heat preservation and noise reduction cotton filling blocks are embedded in the positions, close to the two ends of the first aluminum alloy core body, of the inner side of the first composite alloy connecting piece; and an aluminum alloy core body II is arranged in the middle of the inner side of the composite alloy connecting piece II through an aluminum-plastic co-extrusion process. Through the multi-component synergistic effect of the acrylonitrile-styrene-acrylate copolymer, the polyvinylidene fluoride, the nano silicon dioxide and the compatilizer, the alloy material with excellent performance is obtained; and comprehensive and quantitative performance improvement is achieved in the aspects of heat insulation, sound insulation, strength and durability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum profiles, in particular to a connecting structure of a broken bridge aluminum profile. BACKGROUND

[0002] The broken bridge aluminum profile is a key material for building energy saving. It blocks the heat conduction path by inserting a low thermal conductivity heat insulation strip, i.e. a broken bridge, between aluminum alloy profiles. At present, the mainstream heat insulation bridge material is polyamide nylon, but it has the following inherent defects: Thermal insulation performance decay: nylon material is prone to aging and hydrolysis when exposed to hot and humid, ultraviolet environments for a long time, resulting in an increase in thermal conductivity and a decrease in thermal insulation performance; Sound insulation performance limitation: the existing structure has poor blocking effect on medium and low frequency noise (such as traffic noise), and it is difficult to meet the demand for quiet environment of high-end buildings; Interface reliability problem: the difference in thermal expansion coefficient between plastic and aluminum alloy is significant, and stress concentration is easy to occur at the interface under cold and hot cycles, resulting in cracking and separation of the glue layer, affecting the overall strength and sealing performance of the profile; Single material performance: traditional materials are difficult to simultaneously consider high strength, high weather resistance and excellent acoustic performance.

[0003] For example, a broken bridge aluminum profile for doors and windows (publication number CN217054843U) is disclosed in a Chinese patent. The patent technology is provided with a reinforcing assembly, which can reinforce the installed doors and windows in use, making the doors and windows more stable after installation, effectively avoiding the problem of door and window falling off, and can also be adjusted according to different sizes of doors and windows during reinforcement, so that the device can be applied to different doors and windows, thereby improving the reinforcing effect.

[0004] However, it cannot solve the problems of thermal insulation performance decay, sound insulation performance limitation, interface reliability and single material performance. SUMMARY

[0005] The purpose of the present application is to provide a connecting structure of a broken bridge aluminum profile to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical solutions: The application discloses a kind of broken bridge aluminum profile connecting structure, including composite alloy connecting piece one for connecting aluminum alloy frame one and aluminum alloy frame two, and composite alloy connecting piece two for connecting aluminum alloy frame three and aluminum alloy frame four, the overall structure formed between aluminum alloy frame one, composite alloy connecting piece one and aluminum alloy frame two and the overall structure formed between aluminum alloy frame three, composite alloy connecting piece two and aluminum alloy frame four respectively wrap the outer edge of door and window structure, to support, seal, heat insulation and beautiful for door and window structure, to guarantee the stability and security of door and window;The middle part of the inner side of the composite alloy connecting piece one is provided with an aluminum alloy core body one by an aluminum-plastic co-extrusion process, and a heat-insulating and sound-absorbing cotton filling block one is embedded and installed at both ends of the inner side of the composite alloy connecting piece one close to the aluminum alloy core body one, the middle part of the inner side of the composite alloy connecting piece two is provided with an aluminum alloy core body two by an aluminum-plastic co-extrusion process, and a heat-insulating and sound-absorbing cotton filling block two is embedded and installed at both ends of the inner side of the composite alloy connecting piece two close to the aluminum alloy core body two;By setting the aluminum alloy core body one and the aluminum alloy core body two in the inner side of the composite alloy connecting piece one and the composite alloy connecting piece two respectively, the overall strength and screw wrapping force of the profile can be greatly improved. The composite alloy connecting piece one and the composite alloy connecting piece two are prepared by blending acrylonitrile-styrene-acrylate copolymer (ASA), polyvinylidene fluoride (PVDF), nano-silicon dioxide and a compatibilizer, and by a micro-foaming injection molding process.

[0007] As a further scheme of the application, in the components of the composite alloy connecting piece one and the composite alloy connecting piece two, The mass ratio of the acrylonitrile-styrene-acrylate copolymer is 60% to 75%; The mass ratio of the polyvinylidene fluoride is 20% to 30%; The nano-silicon dioxide is 3% to 8%; The compatibilizer is 1% to 5%; The mass ratio of the acrylonitrile-styrene-acrylate copolymer to the polyvinylidene fluoride is (2.5 to 3.5):1.

[0008] As a further scheme of the application, the compatibilizer is a methyl methacrylate-butyl acrylate-glycidyl methacrylate copolymer; the compatibilizer can improve the interface bonding force and mechanical properties of the composite material.

[0009] As a further scheme of the application, the internal organizational structure of the composite alloy connecting piece one and the composite alloy connecting piece two is in a honeycomb-shaped porous form, and the porosity is 60% to 70%; the air pocket layer in the honeycomb-shaped porous structure can block the heat conduction path, so as to achieve the purpose of heat insulation.

[0010] As a further scheme of the present application: the material of the heat preservation and sound insulation cotton filling block one and the heat preservation and sound insulation cotton filling block two is melamine foam, and the density is 8-10 kg / m 3 The hard-soft composite sound insulation layer is formed between the composite alloy connecting piece one and the heat preservation and sound insulation cotton filling block one and between the composite alloy connecting piece two and the heat preservation and sound insulation cotton filling block two, so that the broadband noise absorption is realized, and the noise reduction effect is improved.

[0011] As a further scheme of the present application: the outer surfaces of the composite alloy connecting piece one and the composite alloy connecting piece two are subjected to plasma surface processing, and rough interface microtexture with roughness Ra=2-5 μm is formed on the outer surfaces; the composite alloy connecting piece one is embedded and assembled in front of the slot of the aluminum alloy frame one and the aluminum alloy frame two, and the composite alloy connecting piece two is embedded and assembled in front of the slot of the aluminum alloy frame three and the aluminum alloy frame four, and epoxy resin adhesive is coated on the outer surfaces of the composite alloy connecting piece one and the composite alloy connecting piece two to improve the bonding strength.

[0012] As a further scheme of the present application: the preparation process and the installation steps of the broken bridge aluminum profile connecting structure are as follows: S1, material preparation of the composite alloy connecting piece: after the acrylonitrile-styrene-acrylate copolymer particles, polyvinylidene fluoride powder, nano silicon dioxide and compatibilizer are proportioned, they are melt blended and granulated in a double screw extruder at 220-240°C to obtain ASA-PV alloy masterbatch; S2, surface pretreatment of the aluminum alloy core: the corresponding section of the aluminum alloy core one and the aluminum alloy core two is pretreated; the pretreatment includes ultrasonic cleaning to remove oil stains, and then anodizing treatment is performed to form a porous and high-surface-energy aluminum oxide layer on the surface, which greatly improves the bonding strength with the subsequent co-extruded ASA-PV alloy material; Since the aluminum alloy core one and the aluminum alloy core two are respectively located at the inner middle part of the composite alloy connecting piece one and the composite alloy connecting piece two, the cross-sectional shape is preferably a multi-cavity structure in the shape of "day", so as to increase the mechanical interlocking force with the plastic; S3, aluminum-plastic co-extrusion and micro-foaming molding: the pretreated aluminum alloy core one and the aluminum alloy core two are sent into an aluminum-plastic co-extrusion mold; the aluminum-plastic co-extrusion mold is designed with a channel for the aluminum alloy core one and the aluminum alloy core two to pass through and a flow channel for the ASA-PV alloy masterbatch to extrude; at the same time, the ASA-PV alloy masterbatch is added into a co-extrusion extruder, and nitrogen gas is injected into the extruded melt section as a physical foaming agent; In the aluminum plastic co-extrusion die, the high temperature and high pressure ASA-PV alloy melt completely coats the preheated aluminum alloy core one and aluminum alloy core two, and is shaped by the die; in this process, the ASA-PV alloy melt wrapped on the aluminum alloy core one forms a composite alloy connector one, the ASA-PV alloy melt wrapped on the aluminum alloy core two forms a composite alloy connector two, and the foaming agent in the melt is gasified due to pressure release, forming a uniform honeycomb micro-porous structure in the composite alloy connector one and the composite alloy connector two, so that the composite alloy connector one and the aluminum alloy core one and the composite alloy connector two and the aluminum alloy core two are one-time composite shaped; S4, plasma surface treatment: the outer surface of the composite alloy connector one and the composite alloy connector two is subjected to plasma surface treatment, so that the surface roughness Ra reaches Ra=2-5um, and the surface chemical groups are activated; S5, filling and composite assembly: the heat and sound insulation cotton filling block one and the heat and sound insulation cotton filling block two are filled into the pre-set cavities in the composite alloy connector one and the composite alloy connector two respectively, and after the outer surface of the composite alloy connector one and the composite alloy connector two is coated with epoxy resin adhesive, the composite alloy connector one is embedded and assembled in the slot of the aluminum alloy frame one and the aluminum alloy frame two, and the composite alloy connector two is embedded and assembled in the slot of the aluminum alloy frame three and the aluminum alloy frame four; and it can be cured at 25 DEG C, 50% humidity for 24h.

[0013] Compared with the prior art, the beneficial effects of the present application are: The present application obtains excellent alloy material through the multi-component synergistic effect of acrylonitrile-styrene-acrylate copolymer, polyvinylidene fluoride, nano silicon dioxide and compatibilizer; realizes functional integration by combining micro-foaming honeycomb structure, aluminum plastic co-extrusion metal core and soft sound insulation cotton; solves the technical problem of firm combination of plastic and metal by combining aluminum plastic co-extrusion and plasma treatment; the product of the present application has achieved comprehensive and quantitative performance improvement in heat insulation, sound insulation, strength and durability. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structure schematic view of a broken bridge aluminum profile connecting structure; Figure 2 It is a structure schematic view of a composite alloy connector one and an aluminum alloy core one after co-extrusion in a broken bridge aluminum profile connecting structure; Figure 3 It is a structure schematic view of a composite alloy connector two and an aluminum alloy core two after co-extrusion in a broken bridge aluminum profile connecting structure.

[0015] In the figure: 1, composite alloy connector one; 2, composite alloy connector two; 3, heat insulation and sound absorption cotton filling block one; 4, aluminum alloy frame one; 5, aluminum alloy frame two; 6, aluminum alloy core one; 7, aluminum alloy frame three; 8, aluminum alloy frame four; 9, heat insulation and sound absorption cotton filling block two; 10, aluminum alloy core two. DETAILED DESCRIPTION Example 1 Preparation and performance test of ASA-PV alloy composite material 1) Purpose of the experiment: Verify the effect of different proportions of ASA / PVDF, nano-silicon dioxide and compatibilizer on the basic mechanical and thermal properties of the alloy material. 2) Experimental process: Raw materials: ASA, PVDF, nano-silicon dioxide, methyl methacrylate-butyl acrylate-methacrylate copolymer.

[0016] Formulation design: 5 groups of formulations are designed according to the following Table 1.

[0017] Preparation: weigh according to the formulation, pre-mix for 5 min with a high-speed mixer, melt blend through a twin-screw extruder, with a temperature of 230°C and a rotation speed of 200 rpm, water cooling, granulation, and drying. Sample preparation: injection molding of the masterbatch into standard tensile, bending, and impact test samples. Performance test: test the tensile strength, bending modulus, and IZOD notched impact strength according to ASTM standards, and test the thermal conductivity according to GB / T10295.

[0018] Table 1 Formulation design table

[0019] The experimental conclusions are as follows: Compared with Comparative Examples 1 and 2, Experimental Group 2 proves the synergistic reinforcing effect of ASA and PVDF blending; After adding nano-silicon dioxide in Experimental Group 3, the rigidity and strength are significantly improved, reflecting the reinforcing effect of nano-particles; After adding a compatibilizer in Experimental Group 4, the mechanical properties are optimal, and the thermal conductivity is the lowest, Therefore, the technical superiority of the Experimental Group 4 ratio is determined as the best basic formulation.

[0020] Example 2: Optimization of aluminum-plastic co-extrusion process and interface strength test 1) Purpose of the experiment Verify the effect of different surface pretreatment methods of aluminum alloy core on the interface bonding strength of aluminum-plastic co-extrusion. 2) Experimental process Sample Preparation: The optimal formulation of ASA-PVD alloy masterbatch of "Experiment Group 5" in Example 1 was used; the 6063 aluminum alloy core (cross-section 5mm x 10mm) was divided into 4 groups for different pretreatments: Group A: solvent cleaning only; Group B: solvent cleaning + phosphating treatment; Group C: solvent cleaning + anodizing (5μm oxide layer formed); Group D: solvent cleaning + anodizing + silane coupling agent spraying; Subsequently, the ASA-PV alloy was coated on the aluminum alloy core (such as aluminum alloy core one or aluminum alloy core two) by the aluminum-plastic co-extrusion micro-foaming process to form a composite sample. Performance Test: Specialized shear test samples were prepared, and a universal testing machine was used to test the interfacial shear strength between the aluminum alloy core and the ASA-PV alloy; the experimental data are shown in Table 2 below.

[0021] Table 2 Interfacial Shear Strength Analysis Table

[0022] The experimental conclusions are as follows: (C group) can create a micron-level porous structure, forming a strong mechanical anchoring effect with the co-extruded molten plastic, with an interfacial strength far exceeding that of traditional phosphating treatment; Although the strength of group D is slightly improved, considering the cost and process complexity, the anodizing treatment of group C is considered to be the most cost-effective solution.

[0023] The failure mode of material cohesion failure indicates that the interfacial bonding strength has exceeded the strength of the plastic matrix itself, which cannot be achieved by existing technologies (such as simple notching or gluing).

[0024] Example 3: Comprehensive performance test of complete profile structure 1) Experimental purpose To compare the performance differences in heat insulation, sound insulation, mechanical load bearing, and durability between the door and window profiles made by the present application and the market-leading products.

[0025] 2) Experimental process and sample description Invention sample: Composite alloy connecting piece (such as composite alloy connecting piece one and composite alloy connecting piece two): using the formulation of experiment group 4, the aluminum alloy core is anodized and formed by aluminum-plastic co-extrusion micro-foaming, with an aluminum alloy core inside; Structure: ASA-PV alloy honeycomb structure + built-in aluminum alloy core + filled melamine foam (such as thermal and sound insulation cotton filling block one and thermal and sound insulation cotton filling block two); The surface is plasma treated, and the surface is compounded with an aluminum alloy frame (such as aluminum alloy frame one, aluminum alloy frame two, aluminum alloy frame three, and aluminum alloy frame four) by using epoxy glue.

[0026] Comparative sample: Comparative example A: market mainstream PA66 thermal insulation strip (without core) broken bridge aluminum profile; Comparative example B: PA66 thermal insulation strip broken bridge aluminum profile with a steel core.

[0027] 3) Experimental process The overall thermal conductivity U value [W / (m²·K)] (test standard GB / T 8484), the weighted sound insulation Rw [dB] (test standard GB / T 8485), the vertical shear resistance [kN] (test standard EN 14024), the hardware screw pull-out force [N], and the ultraviolet aging for 1000h are respectively carried out, and the experimental results are recorded in Table 3 below.

[0028] Table 3 performance measurement result analysis table

[0029] The experimental conclusions are as follows: The profile of the present application has achieved overall breakthrough in key performance; among them, Thermal insulation performance: thanks to the low thermal conductivity of the ASA-PV alloy and the microporous structure, the U value is significantly lower than that of the benchmark product; Sound insulation performance: the hard-soft composite soundproof layer design makes the sound insulation reach the high standard of quietness requirement; Mechanical performance: the aluminum alloy core of the aluminum plastic co-extrusion provides unparalleled overall strength and screw grip force, solving the industry pain point; Durability: the inherent super strong weather resistance of ASA and PVDF ensures that the performance attenuation of the product is extremely low after long-term use, and the life cycle cost is greatly reduced.

[0030] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A thermally broken aluminum profile connection structure, comprising a composite alloy connector one (1) for connecting an aluminum alloy frame one (4) and an aluminum alloy frame two (5), and a composite alloy connector two (2) for connecting an aluminum alloy frame three (7) and an aluminum alloy frame four (8), characterized in that, The inner middle of the composite alloy connector one (1) is provided with an aluminum alloy core one (6) through an aluminum-plastic co-extrusion process, and thermal insulation and sound-absorbing cotton filling blocks one (3) are embedded and installed at both ends of the inner side of the composite alloy connector one (1) near the aluminum alloy core one (6). The inner middle of the composite alloy connector two (2) is provided with an aluminum alloy core two (10) through an aluminum-plastic co-extrusion process, and thermal insulation and sound-absorbing cotton filling blocks two (9) are embedded and installed at both ends of the inner side of the composite alloy connector two (2) near the aluminum alloy core two (10). Both the composite alloy connector one (1) and the composite alloy connector two (2) are made by blending acrylonitrile-styrene-acrylate copolymer, polyvinylidene fluoride, nano-silica and compatibilizer, and by micro-foaming injection molding process.

2. The thermal break aluminum profile connection structure according to claim 1, characterized in that, In each component of the composite alloy connector one (1) and the composite alloy connector two (2), The mass ratio of acrylonitrile-styrene-acrylate copolymer is 60%–75%; The mass ratio of polyvinylidene fluoride is 20%–30%; Nano-silica 3%–8%; Compatibilizer 1%–5%; The mass ratio of acrylonitrile-styrene-acrylate copolymer to polyvinylidene fluoride is (2.5-3.5):

1.

3. The thermal break aluminum profile connection structure according to claim 1, characterized in that, The compatibilizer is a copolymer of methyl methacrylate, butyl acrylate, and glycidyl methacrylate.

4. The thermal break aluminum profile connection structure according to claim 1, characterized in that, The internal structure of both composite alloy connector one (1) and composite alloy connector two (2) is honeycomb porous, with a porosity of 60% to 70%.

5. The thermal break aluminum profile connection structure according to claim 1, characterized in that, Both the insulation and sound-absorbing cotton filling block one (3) and the insulation and sound-absorbing cotton filling block two (9) are made of melamine foam cotton with a density of 8-10 kg / m³. 3 A hard-soft composite sound-absorbing layer is formed between the first composite alloy connector (1) and the first thermal insulation and sound-absorbing cotton filling block (3), and between the second composite alloy connector (2) and the second thermal insulation and sound-absorbing cotton filling block (9).

6. The thermal break aluminum profile connection structure according to claim 1, characterized in that, The outer surfaces of both composite alloy connector one (1) and composite alloy connector two (2) are treated with plasma surface treatment, and rough interface micro-texture with roughness Ra=2~5μm is formed on the outer surface.

7. The thermal break aluminum profile connection structure according to claim 1, characterized in that, The manufacturing process and installation steps of the thermal break aluminum profile connection structure are as follows: S1. Material preparation of composite alloy connectors: After mixing acrylonitrile-styrene-acrylate copolymer particles, polyvinylidene fluoride powder, nano-silica and compatibilizer, the mixture is melt-blended and granulated in a twin-screw extruder at 220-240℃ to obtain ASA-PV alloy masterbatch. S2. Surface pretreatment of aluminum alloy core: aluminum alloy core one (6) and aluminum alloy core two (10) with corresponding cross sections are pretreated to form a porous aluminum oxide layer with high surface energy on their surface. S3, Aluminum-plastic co-extrusion and micro-foaming molding: The pretreated aluminum alloy core one (6) and aluminum alloy core two (10) are fed into the aluminum-plastic co-extrusion mold; at the same time, ASA-PV alloy masterbatch is added to the co-extrusion extruder and nitrogen is injected into the molten section of the extrusion. Inside the aluminum-plastic co-extrusion mold, the high-temperature and high-pressure ASA-PV alloy melt completely covers the preheated aluminum alloy core 1 (6) and aluminum alloy core 2 (10), and is shaped by the mold; during this process, the ASA-PV alloy melt wraps around the aluminum alloy core 1 (6) to form composite alloy connector 1 (1), and the ASA-PV alloy melt wraps around the aluminum alloy core 2 (10) to form composite alloy connector 2 (2). S4. Plasma surface treatment: Plasma surface treatment is performed on the outer surfaces of composite alloy connector one (1) and composite alloy connector two (2) to make their surface roughness Ra reach Ra=2~5μm and activate surface chemical groups. S5. Filling and Composite Assembly: Fill the pre-set cavities in the composite alloy connectors 1 (1) and 2 (2) with thermal insulation and sound-absorbing cotton filler block 1 (3) and thermal insulation and sound-absorbing cotton filler block 2 (9), respectively. After coating the outer surfaces of the composite alloy connectors 1 (1) and 2 (2) with epoxy resin adhesive, embed the composite alloy connector 1 (1) into the slots of the aluminum alloy frame 1 (4) and 2 (5), and embed the composite alloy connector 2 (2) into the slots of the aluminum alloy frame 3 (7) and 4 (8). Then cure for 24 hours at 25°C and 50% humidity.

Images