A kind of broken bridge aluminium door and window heat insulation strip and its preparation method

Abstract

The application relates to the field of door and window materials, and particularly discloses a broken bridge aluminum door and window heat insulation strip and a preparation method thereof, which comprises the following raw materials: PA510 particles, PA10T, an antioxidant, an ultraviolet absorber, glass fibers, a silane coupling agent and a heat-resistant modifier; wherein the heat-resistant modifier comprises silica aerogel and a Peek-silica composite modifier; the preparation method comprises the following steps: dissolving the silane coupling agent in an ethanol solution, adding the glass fibers, impregnating and drying to obtain pretreated glass fibers; mixing and stirring the PA510 particles and the PA10T, then adding the antioxidant, the ultraviolet absorber, the pretreated glass fibers and the heat-resistant modifier in sequence, mixing and stirring to obtain a mixture, then melt-extruding the mixture and cooling and shaping to obtain the broken bridge aluminum door and window heat insulation strip. The application has the characteristics that the broken bridge aluminum door and window heat insulation strip is prepared by using a bio-based polyamide as a raw material, and the heat resistance and the mechanical properties are further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of door and window materials, and more particularly to a broken bridge aluminum door and window heat barrier and a preparation method thereof. BACKGROUND

[0002] With the continuous promotion of building energy-saving policy and the increasing demand for living environment comfort, building doors and windows, as one of the most serious heat loss parts in building envelope structure, their thermal insulation performance has become an important indicator to measure the building energy-saving level. Aluminum alloy is widely used in door and window profile manufacturing due to its good strength, corrosion resistance and processing performance. However, the traditional aluminum alloy profile has a high thermal conductivity coefficient (about 180 W / (m·K)), which easily forms a clear thermal bridge effect under large indoor and outdoor temperature difference, leading to rapid heat conduction, causing indoor energy loss and affecting the overall energy-saving effect of the building.

[0003] To solve the above problems, in recent years, the "broken bridge aluminum" technology is generally used, that is, a heat barrier is arranged in the middle of the aluminum alloy profile to separate the metal profiles on the indoor and outdoor sides, thereby effectively blocking the heat conduction path and achieving the purpose of reducing the heat transfer coefficient. The broken bridge aluminum door and window heat barrier, as a key component of the door and window system, directly affects the thermal insulation effect, mechanical properties and durability of the door and window.

[0004] The commonly used heat barrier materials at present mainly include PA66GF25 material (polyamide (PA66) and glass fiber composite material), which has a low thermal conductivity coefficient, good mechanical strength and aging resistance, and can meet the structural stability and service life requirements under normal use conditions. However, PA66GF25 material itself is difficult to degrade, and mainly depends on non-renewable resources such as petroleum. With the gradual depletion of global petroleum resources, it is necessary to find renewable alternative resources. At present, some research has been done on bio-based polyamide, which partially or completely uses renewable resources as raw materials, reduces the dependence on petroleum, and meets the requirements of green building and sustainable development. As an environmentally friendly material, it has broad application prospects in the field of heat barriers.

[0005] However, the traditional bio-based polyamide heat barrier has problems such as insufficient heat resistance and limited mechanical properties, which is difficult to meet the comprehensive demand of high-end door and window system for heat insulation, structural strength and environmental protection. Therefore, developing a bio-based polyamide heat barrier with high heat resistance and excellent mechanical properties has become a research hotspot. SUMMARY

[0006] In order to prepare a broken bridge aluminum door and window heat barrier with bio-based polyamide as raw material, and further improve the heat resistance while improving the mechanical properties, the present application provides a broken bridge aluminum door and window heat barrier and a preparation method thereof.

[0007] In a first aspect, the application provides a heat insulation strip for a broken bridge aluminum door and window, which adopts the following technical scheme:

[0008] A heat insulation strip for a broken bridge aluminum door and window comprises the following raw materials by weight:

[0009] 50-60 parts of PA510 particles, 15-30 parts of PA10T, 0.1-0.5 parts of an antioxidant, 0.5-1.5 parts of an ultraviolet absorber, 10-20 parts of glass fiber, 3-5 parts of a silane coupling agent, and 3-8 parts of a heat-resistant modifier;

[0010] The heat-resistant modifier comprises silica aerogel and a Peek-silica composite modifier in a mass ratio of 1: (1.4-1.6), the Peek-silica composite modifier has silica loaded with a Peek powder as a core material and a polymer layer formed by polymerization of N-hydroxyethyl acrylamide, acrylic acid, and methacrylate monomers as a shell layer.

[0011] By adopting the above technical scheme, in the application, PA510 and PA10T are used together as bio-based polyamide materials, PA510 has good toughness and low water absorption, PA10T has excellent heat resistance, dimensional stability, and chemical corrosion resistance, and the combination of the two takes into account heat resistance and mechanical properties, the antioxidant prevents the oxidation and degradation of polyamide during processing and use, and the addition of the ultraviolet absorber can absorb ultraviolet rays to protect polyamide from aging due to ultraviolet radiation.

[0012] On this basis, in the application, silica aerogel is added as a heat-resistant modifier, the silica aerogel has a low thermal conductivity, effectively improves the heat insulation performance of the heat insulation strip, and significantly improves the heat resistance of the heat insulation strip, the addition of the Peek-silica composite modifier significantly improves the heat resistance and mechanical properties of the heat-resistant modifier by using polyether ether ketone (Peek) which has excellent heat resistance and mechanical strength and chemical stability, and especially by improving the brittleness and low strength of the silica aerogel, loading the Peek powder on the silica as the core material and then forming a polymer layer through in-situ polymerization to form a core-shell structure, which significantly improves the compatibility and interfacial bonding force of the composite modifier and the polyamide matrix. Finally, in the application, silica aerogel and a Peek-silica composite modifier are selected as heat-resistant modifiers, the silica aerogel improves the heat insulation performance, the Peek-silica composite modifier significantly improves the heat resistance and mechanical properties by the joint action of the core material, the shell material significantly improves the compatibility with the polyamide matrix, and the addition of the silane coupling agent further improves the compatibility and interfacial bonding force between the heat-resistant modifier and the matrix, and also improves the interfacial bonding between the glass fiber and the matrix, finally improving the heat resistance and mechanical properties of the heat insulation strip, especially maintaining excellent mechanical properties under long-term high-temperature conditions, and improving the durability of the heat insulation strip.

[0013] Optionally, the Peek-silica composite modifier is prepared by the following method:

[0014] 1) After mixing the Peek powder with diphenyl sulfone, heat to 200-220℃, stir and mix to prepare an impregnation solution, then add silica and perform pressure impregnation treatment, then cool and filter to prepare silica loaded with Peek;

[0015] Mix the silica loaded with Peek with hydroxyethyl cellulose and water to prepare a mixed solution, add vinyl triethoxysilane to the mixed solution, adjust the pH to be acidic, continue impregnation treatment for 30-40 min, then filter and dry to prepare pretreated silica;

[0016] 2) Mix N-hydroxyethyl acrylamide, acrylic acid and methacrylate monomers, then dissolve in an aqueous ethanol solution, then add an initiator, then add the pretreated silica prepared in step 1), heat to 55-65℃ and react for 2-3 h, then cool, filter and dry to prepare a Peek-silica composite modifier.

[0017] By using the above technical solution, the Peek is first mixed with diphenyl sulfone at high temperature to achieve dissolution of the Peek powder, then silica is added and pressure impregnation is performed to achieve loading of the Peek powder in the pore structure of the silica, then the silica loaded with Peek is added to a solution containing hydroxyethyl cellulose, the hydroxyethyl cellulose acts as a anti-settling agent to help the suspension of the silica loaded with Peek in water, after adding vinyl triethoxysilane and adjusting the pH to be acidic, the vinyl triethoxysilane hydrolyzes under acidic conditions to form chemical bonds with the hydroxyl groups on the surface of the silica and the terminal hydroxyl groups of the Peek powder, introducing carbon-carbon double bonds to provide reaction sites for subsequent in-situ polymerization, and pretreated silica is prepared.

[0018] Then it is added to a monomer solution, the N-hydroxyethyl acrylamide, acrylic acid and methacrylate monomers react through unsaturated double bonds and polymerize with the vinyl groups on the surface of the pretreated silica, thereby achieving in-situ polymerization, and the hydroxyl groups on the surface of the silica can also react with the carboxyl groups in the monomers such as acrylic acid, thereby achieving orientation of the monomer polymerization, achieving in-situ polymerization, and introducing amide groups and carboxyl groups and other functional groups into the polymer layer, the amide groups and carboxyl groups and other functional groups and the polyamide significantly improve the compatibility and interfacial bonding force with the polyamide matrix, thereby achieving uniform distribution of the composite modifier in the polyamide matrix, and achieving better improvement in heat resistance and mechanical properties.

[0019] Optionally, in the preparation of the Peek-silica composite modifier, the mass ratio of the Peek powder to the silica in step 1) is 1: (1.5-1.8), the amount of the hydroxyethyl cellulose added is 1-3 wt% of the silica, and the amount of the vinyl triethoxysilane added is 5-10 wt% of the loaded silica.

[0020] In step 2), the mass ratio of the N-hydroxyethyl acrylamide, the acrylic acid and the methacrylate is 1: (0.5-0.8): (0.6-0.8), and the mass ratio of the sum of the N-hydroxyethyl acrylamide, the acrylic acid and the methacrylate monomers to the pretreated silica is 1: (1.1-1.3), and the amount of the initiator added is 1-3 wt% of the sum of the N-hydroxyethyl acrylamide, the acrylic acid and the methacrylate monomers.

[0021] By adopting the above technical solution, the composite modifier prepared by using the above ratio is used for the preparation of the heat insulation strip, and the comprehensive performance of the final heat insulation strip is better.

[0022] Optionally, in the preparation of the Peek-silica composite modifier, the pressure impregnation parameters in step 1) are as follows: the impregnation pressure is 0.5-0.8 MPa, and the impregnation time is 1-2 h.

[0023] By adopting the above technical solution, when the impregnation treatment adopts high-pressure impregnation, it is helpful to promote the diffusion of the Peek into the pores of the silica, thereby helping to improve the loading effect of the Peek powder and enhancing the heat resistance and mechanical properties.

[0024] Optionally, in the preparation of the Peek-silica composite modifier, in step 1), the Peek powder is added after being treated by the oxygen plasma, and PAMAM, genipin and γ-aminopropyl trimethoxysilane are also added in step 1) at the same time as the vinyl triethoxysilane.

[0025] Optionally, the mass ratio of the γ-aminopropyl trimethoxysilane to the vinyl triethoxysilane is 1: (2-3), the amount of the genipin added is 0.3-0.8 wt% of the silica, and the amount of the PAMAM added is 1-3 wt% of the silica.

[0026] By adopting the technical scheme, the Peek powder is activated after oxygen plasma treatment, carboxyl and other oxygen-containing active groups are introduced, and PAMAM, genipin and gamma-aminopropyl trimethoxysilane are added. Under acidic and elevated temperature conditions, the amino groups in PAMAM can form chemical bonds with the carboxyl oxygen-containing functional groups on the Peek powder, the gamma-aminopropyl trimethoxysilane as a silane coupling agent forms chemical bonds with the silicon dioxide, and the genipin can cross-link the introduced amino or amide functional groups. In this way, the chemical bonding between the Peek powder and the silicon dioxide is improved, the loading firmness is improved, and the loss during subsequent in-situ polymerization is prevented.

[0027] Optionally, the plasma parameters are: treating the Peek powder under the conditions of a power of 120-150 W and an oxygen flow rate of 50-80 sccm for 1-3 min.

[0028] Optionally, the modified silica aerogel is added after modification treatment. The modification treatment is specifically performed as follows: the silica aerogel is first immersed in a vinyl triethoxysilane ethanol aqueous solution for treatment, then maleic anhydride-styrene copolymer is added, and the mixture is reacted at 55-70℃ for 30-40 min, and then filtered and dried.

[0029] By adopting the technical scheme, the vinyl triethoxysilane is hydrolyzed and reacts with the hydroxyl groups on the surface of the silica aerogel to introduce vinyl groups onto the surface of the silica aerogel. On the one hand, the hydrophobicity of the silica aerogel is improved, and van der Waals forces are formed with the alkyl chains in the polyamide matrix, thereby enhancing the interfacial bonding force. Moreover, the free rotation of the vinyl groups makes them adapt to the high-temperature molecular chain movement of the polyamide matrix, thereby reducing the interfacial stress concentration and improving the heat resistance. Furthermore, the vinyl groups can form chemical bonds with the unreacted groups in the Peek-silica composite modifier, so that the heat-resistant modifier forms a macromolecular chain structure, thereby further improving the heat resistance.

[0030] Then, after adding the maleic anhydride-styrene copolymer, the maleic anhydride units can react with the hydroxyl groups on the surface of the silica aerogel to form chemical polymerization, and can also form chemical bonds with the terminal amino groups of the polyamide matrix. Meanwhile, the styrene segments have good compatibility with the non-polar part of PA510 and PA10T, forming a good interfacial transition layer between the silica aerogel and the polyamide matrix, reducing the interfacial defects, and enabling the silica aerogel to form a good interfacial bond with the polyamide matrix, thereby improving the compatibility and the dispersion uniformity, and playing a good heat insulation modification role.

[0031] Optionally, when the silica aerogel is modified, the amount of vinyl triethoxysilane added is 3-5 wt% of the silica aerogel, and the amount of maleic anhydride-styrene copolymer added is 5-10 wt% of the silica aerogel.

[0032] In a second aspect, the application provides a preparation method of a thermal break strip for a broken bridge aluminum door and window, which adopts the following technical scheme:

[0033] A preparation method of a thermal break strip for a broken bridge aluminum door and window, comprising the following steps:

[0034] The silane coupling agent is dissolved in 2-3 mass times of an ethanol solution, and then the pretreated glass fiber is prepared by immersing the glass fiber in the solution for 30-60 min and drying.

[0035] The PA510 particles and the PA10T are mixed and stirred, and then the antioxidant, the ultraviolet absorber, the pretreated glass fiber and the heat-resistant modifier are sequentially added.

[0036] By adopting the above technical scheme, the thermal break strip is prepared by the above method, which is simple, convenient and easy to realize industrialization.

[0037] In summary, the application has the following beneficial effects:

[0038] 1. In the application, silica aerogel is added as a heat-resistant modifier. The silica aerogel has a low thermal conductivity, effectively improves the thermal insulation performance of the thermal break strip, and significantly improves the heat resistance of the thermal break strip. The addition of the Peek-silica composite modifier significantly improves the heat resistance and mechanical properties of the thermal break strip. The silica aerogel is loaded on the silica as a core material and then forms a core-shell structure through in-situ polymerization, which significantly improves the compatibility and interfacial bonding force between the composite modifier and the polyamide matrix.

[0039] 2. In the application, silica aerogel and a Peek-silica composite modifier are selected as heat-resistant modifiers. The silica aerogel improves the thermal insulation performance, and the Peek-silica composite modifier significantly improves the heat resistance and mechanical properties through the joint action of the core material. The shell material significantly improves the compatibility with the polyamide matrix. In addition, the addition of the silane coupling agent further improves the compatibility and interfacial bonding force between the heat-resistant modifier and the matrix, and also improves the interfacial bonding between the glass fiber and the matrix, thereby improving the heat resistance and mechanical properties of the thermal break strip, especially the excellent mechanical properties under long-term high-temperature conditions, and improving the durability of the thermal break strip. DETAILED DESCRIPTION

[0040] The application will be further described in detail in conjunction with the following examples, and it is particularly pointed out that: the specific conditions are not indicated in the following examples, and the conventional conditions or the conditions recommended by the manufacturer are used, and the raw materials used in the following examples can be obtained from ordinary market sales unless otherwise specified.

[0041] In the following examples, PA510 particles are selected from the bio-based nylon 510 of Shanghai Likas Industry Co., Ltd.

[0042] PA10T is selected from Evonik Htplus M3035 environmentally friendly material PA10T of Dongguan Tianhong Plastic Co., Ltd. with model number M3035;

[0043] The silica aerogel is selected from Cabot ENOVA IC3100 silica aerogel of Yinhang (Shanghai) Industry Co., Ltd.

[0044] The maleic anhydride-styrene copolymer is selected from maleic anhydride-styrene copolymer of Hubei Huada Fine Chemical Co., Ltd. with CAS number 9011-13-6.

[0045] The silica in the following preparation examples is macroporous silica with a pore size of > 50 nanometers, more specifically, the silica is selected from 120A macroporous silica of Rizhao Kefanoxin Material Co., Ltd. with a particle size of 80-150 mesh;

[0046] The Peek powder is selected from ultra-fine Peek powder of Dongguan Kadar Plastic Raw Material Co., Ltd. with a particle size of 10-15 microns.

[0047] The following preparation example is a preparation example of a Peek-silica composite modifier

[0048] Preparation Example 1

[0049] A preparation method of a Peek-silica composite modifier, comprising the following steps:

[0050] 1), taking 10 kg of silica as a treatment reference, mixing the Peek powder with diphenyl sulfone according to a mass ratio of 1:7, heating to 210°C, stirring and mixing to prepare an impregnation solution, then adding silica and pressure impregnation treatment for 1.5 h, the impregnation pressure is 0.6 MPa, and the addition mass ratio of the Peek powder to the silica is 1:1.6, then cooling and filtering to prepare the loaded silica loaded with Peek;

[0051] Mixing the loaded silica with hydroxyethyl cellulose and water to prepare a mixed solution, adding vinyltriethoxysilane in the mixed solution, adjusting the pH to 4.5, continuing to perform normal pressure impregnation treatment at 50°C for 35 min, then filtering and drying to prepare the pretreated silica;

[0052] The addition amount of hydroxyethyl cellulose is 2wt% of the loaded silica, the addition amount of water is 3.5 times of the mass of the silica, and the addition amount of vinyl triethoxysilane is 8wt% of the loaded silica;

[0053] 2), N-hydroxyethyl acrylamide, acrylic acid and methacrylate monomers are mixed according to a mass ratio of 1:0.6:0.7 to prepare mixed monomers, then the mixed monomers are dissolved in an ethanol aqueous solution with a mass concentration of 35%, then an initiator ammonium persulfate is added, then the pretreated silica prepared in step 1) is added, the temperature is raised to 60 DEG C, and reaction is performed for 2.5h, then after cooling, filtration and drying, a Peek-silica composite modifier is prepared;

[0054] The addition mass ratio of the mixed monomers to the pretreated silica is 1:1.2, and the addition amount of the initiator is 2wt% of the mixed monomers.

[0055] Preparation Example 2

[0056] A preparation method of a Peek-silica composite modifier, comprising the following steps:

[0057] 1), Peek powder and diphenyl sulfone are mixed according to a mass ratio of 1:6, then the temperature is raised to 200 DEG C, and after stirring and mixing, an impregnation solution is prepared, then silica is added, and pressure impregnation treatment is performed for 1h, the impregnation pressure is 0.5MPa, and the addition mass ratio of the Peek powder to the silica is 1:1.5, then after cooling and filtration, loaded silica loaded with Peek is prepared;

[0058] The loaded silica is mixed with hydroxyethyl cellulose and water to prepare a mixed solution, vinyl triethoxysilane is added to the mixed solution, the pH is adjusted to 4, and after continued normal pressure impregnation treatment at 55 DEG C for 30min, filtration and drying, pretreated silica is prepared;

[0059] The addition amount of hydroxyethyl cellulose is 1wt% of the loaded silica, the addition amount of water is 3 times of the mass of the silica, and the addition amount of vinyl triethoxysilane is 5wt% of the loaded silica;

[0060] 2), N-hydroxyethyl acrylamide, acrylic acid and methacrylate monomers are mixed according to a mass ratio of 1:0.5:0.6 to prepare mixed monomers, then the mixed monomers are dissolved in an ethanol aqueous solution with a mass concentration of 30%, then an initiator ammonium persulfate is added, then the pretreated silica prepared in step 1) is added, the temperature is raised to 55 DEG C, and reaction is performed for 3h, then after cooling, filtration and drying, a Peek-silica composite modifier is prepared;

[0061] The addition mass ratio of the mixed monomers to the pretreated silica is 1:1.1, and the addition amount of the initiator is 1wt% of the mixed monomers.

[0062] Preparation Example 3

[0063] A preparation method of a Peek-silica composite modifier, comprising the following steps:

[0064] 1), with 10 kg of silica as a treatment reference, mixing the Peek powder and diphenyl sulfone according to a mass ratio of 1:8, heating to 220℃, stirring and mixing to prepare an impregnation solution, then adding silica and pressure impregnation treatment for 2h, the impregnation pressure is 0.8MPa, and the mass ratio of the added Peek powder and silica is 1:1.8, then cooling and filtering to prepare silica loaded with Peek;

[0065] Mixing the loaded silica with hydroxyethyl cellulose and water to prepare a mixed solution, adding vinyl triethoxysilane in the mixed solution, adjusting the pH to 5, continuing normal pressure impregnation treatment at 45℃ for 40min, then filtering and drying to prepare pretreated silica;

[0066] Among them, the addition amount of hydroxyethyl cellulose is 3wt% of the loaded silica, the addition amount of water is 4 mass times of the silica, and the addition amount of vinyl triethoxysilane is 10wt% of the loaded silica;

[0067] 2), mixing N-hydroxyethyl acrylamide, acrylic acid and methacrylate monomers according to a mass ratio of 1:0.8:0.8 to prepare a mixed monomer, then dissolving the mixed monomer in an ethanol aqueous solution with a mass concentration of 40%, then adding an initiator ammonium persulfate, then adding the pretreated silica prepared in step 1), heating to 65℃ for 2h, then cooling, filtering and drying to prepare a Peek-silica composite modifier;

[0068] Among them, the mass ratio of the mixed monomer to the pretreated silica is 1:1.3, and the addition amount of the initiator is 3wt% of the mixed monomer.

[0069] Preparation Example 4

[0070] A preparation method of a Peek-silica composite modifier, according to the method in Preparation Example 1, the difference is that in step 1), the Peek powder is added after being treated by oxygen plasma for 2min under the conditions of a power of 140W and an oxygen flow of 60sccm;

[0071] And in step 1), PAMAM, genipin and γ-aminopropyl trimethoxysilane are also added at the same time as the vinyl triethoxysilane, the mass ratio of γ-aminopropyl trimethoxysilane to vinyl triethoxysilane is 1:2.5, the addition amount of genipin is 0.5wt% of the silica, and the addition amount of PAMAM is 2wt% of the silica.

[0072] Preparation Example 5

[0073] A preparation method of a Peek-silica composite modifier is performed according to the method in Preparation Example 1, except that the Peek powder in step 1) is added after being subjected to oxygen plasma treatment at a power of 120 W and an oxygen flow rate of 50 sccm for 3 min.

[0074] In step 1), PAMAM, genipin and γ-aminopropyltrimethoxysilane are also added at the same time as the addition of the vinyltriethoxysilane, the mass ratio of the γ-aminopropyltrimethoxysilane to the vinyltriethoxysilane is 1:2, the amount of the genipin added is 0.3 wt% of the silica, and the amount of the PAMAM added is 1 wt% of the silica.

[0075] Preparation Example 6

[0076] A preparation method of a Peek-silica composite modifier is performed according to the method in Preparation Example 1, except that the Peek powder in step 1) is added after being subjected to oxygen plasma treatment at a power of 150 W and an oxygen flow rate of 80 sccm for 1 min.

[0077] In step 1), PAMAM, genipin and γ-aminopropyltrimethoxysilane are also added at the same time as the addition of the vinyltriethoxysilane, the mass ratio of the γ-aminopropyltrimethoxysilane to the vinyltriethoxysilane is 1:3, the amount of the genipin added is 0.8 wt% of the silica, and the amount of the PAMAM added is 3 wt% of the silica.

[0078] Preparation Example 7

[0079] A preparation method of a Peek-silica composite modifier is performed according to the method in Preparation Example 4, except that no PAMAM is added.

[0080] Preparation Example 8

[0081] A preparation method of a Peek-silica composite modifier is performed according to the method in Preparation Example 4, except that the Peek powder in step 1) is added after being subjected to oxygen plasma treatment at a power of 140 W and an oxygen flow rate of 60 sccm for 2 min. Also, no PAMAM, genipin and γ-aminopropyltrimethoxysilane are added.

[0082] Comparative Preparation Example 1

[0083] A preparation method of a Peek-silica composite modifier is carried out according to the method in Preparation Example 4, except that step 2) is not processed, and the equivalent of vinyl triethoxysilane in step 1) is replaced by KH-550.

[0084] Comparative Preparation Example 2

[0085] A preparation method of a Peek-silica composite modifier is carried out according to the method in Preparation Example 4, except that N-hydroxyethyl acrylamide is not added to the mixed monomers in step 2).

[0086] Example 1

[0087] A preparation method of a heat insulation strip for a broken bridge aluminum door and window comprises the following steps:

[0088] S1, 4kg of silane coupling agent KH-550 is dissolved in 2.5 mass times of an ethanol solution with a mass concentration of 45%, the pH is adjusted to 4, then 15kg of glass fiber is immersed for 40min and then filtered and dried to obtain pretreated glass fiber;

[0089] S2, 55kg of PA510 particles and 22kg of PA10T are placed in a high-speed mixer and stirred at a speed of 1000r / min for 8min, then 0.3kg of antioxidant 1010, 1kg of ultraviolet absorber (specifically ultraviolet absorber UV-234), the pretreated glass fiber obtained in S1 and 5kg of heat-resistant modifier are sequentially added to the high-speed mixer, and the mixing and stirring are continued for 12min to obtain a mixture, then the mixture is added to a screw extruder for melt extrusion, and then cooled and shaped to obtain a heat insulation strip for a broken bridge aluminum door and window.

[0090] Among them, the temperature of each zone of the screw extruder is: zone one 190℃, zone two 220℃, zone three 240℃, and the head 250℃.

[0091] Among them, the heat-resistant modifier comprises a mixture of silica aerogel and Peek-silica composite modifier prepared by mixing in a mass ratio of 1:1.5, and the Peek-silica composite modifier is selected from the Peek-silica composite modifier prepared in Preparation Example 1.

[0092] Example 2

[0093] A preparation method of a heat insulation strip for a broken bridge aluminum door and window comprises the following steps:

[0094] S1, 3kg of silane coupling agent KH-550 is dissolved in 2 mass times of an ethanol solution with a mass concentration of 40%, the pH is adjusted to 4, then 10kg of glass fiber is immersed for 30min and then filtered and dried to obtain pretreated glass fiber;

[0095] S2, 50 kg of PA510 particles and 15 kg of PA10T are placed in a high-speed mixer and stirred at a speed of 800 r / min for 10 min, then 0.1 kg of antioxidant 1010, 0.5 kg of ultraviolet absorber (specifically ultraviolet absorber UV-234), the pretreated glass fiber prepared in S1 and 3 kg of heat-resistant modifier are sequentially added to the high-speed mixer, and the mixing and stirring are continued for 10 min to prepare a mixture, then the mixture is added to a screw extruder for melt extrusion, and then cooled and shaped to prepare a broken bridge aluminum door and window heat insulation strip.

[0096] Wherein, the temperature of each zone of the screw extruder is: zone one 180℃, zone two 210℃, zone three 230℃, and the head 240℃.

[0097] Wherein, the heat-resistant modifier includes a mixture of silica aerogel and Peek-silica composite modifier prepared by mixing at a mass ratio of 1:1.4, and the Peek-silica composite modifier is selected from the Peek-silica composite modifier prepared in Preparation Example 2.

[0098] Example 3

[0099] A preparation method of a broken bridge aluminum door and window heat insulation strip, comprising the following steps:

[0100] S1, 5 kg of silane coupling agent KH-550 is dissolved in 3 mass times of an ethanol solution with a mass concentration of 50%, the pH is adjusted to 5, then 20 kg of glass fiber is immersed for 60 min, filtered and dried to prepare pretreated glass fiber;

[0101] S2, 60 kg of PA510 particles and 30 kg of PA10T are placed in a high-speed mixer and stirred at a speed of 1200 r / min for 5 min, then 0.5 kg of antioxidant 1010, 1.5 kg of ultraviolet absorber (specifically ultraviolet absorber UV-234), the pretreated glass fiber prepared in S1 and 8 kg of heat-resistant modifier are sequentially added to the high-speed mixer, and the mixing and stirring are continued for 15 min to prepare a mixture, then the mixture is added to a screw extruder for melt extrusion, and then cooled and shaped to prepare a broken bridge aluminum door and window heat insulation strip.

[0102] Wherein, the temperature of each zone of the screw extruder is: zone one 200℃, zone two 230℃, zone three 250℃, and the head 260℃.

[0103] Wherein, the heat-resistant modifier includes a mixture of silica aerogel and Peek-silica composite modifier prepared by mixing at a mass ratio of 1:1.6, and the Peek-silica composite modifier is selected from the Peek-silica composite modifier prepared in Preparation Example 3.

[0104] Example 4-8

[0105] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Example 1, except that the Peek-silica composite modifier in step S2 is selected from the Peek-silica composite modifiers prepared in Preparation Examples 4-8.

[0106] Example 9

[0107] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Example 1, except that the silica aerogel in the heat-resistant modifier in step S2 is added after modification treatment, and the specific operation is as follows: vinyltriethoxysilane and an ethanol solution with a mass concentration of 30% are mixed in a mass ratio of 1:4, then the silica aerogel is added for impregnation treatment, after 25 min of impregnation treatment, maleic anhydride-styrene copolymer is added, and after 35 min of reaction at 60°C, the modified silica aerogel is filtered and dried, and then added according to the method in Example 1.

[0108] The addition amount of the vinyltriethoxysilane is 4wt% of the silica aerogel, and the addition amount of the maleic anhydride-styrene copolymer is 8wt% of the silica aerogel.

[0109] Example 10

[0110] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Example 1, except that the silica aerogel in the heat-resistant modifier in step S2 is added after modification treatment, and the specific operation is as follows: vinyltriethoxysilane and an ethanol solution with a mass concentration of 30% are mixed in a mass ratio of 1:4, then the silica aerogel is added for impregnation treatment, after 20 min of impregnation treatment, maleic anhydride-styrene copolymer is added, and after 40 min of reaction at 55°C, the modified silica aerogel is filtered and dried, and then added according to the method in Example 1.

[0111] The addition amount of the vinyltriethoxysilane is 3wt% of the silica aerogel, and the addition amount of the maleic anhydride-styrene copolymer is 5wt% of the silica aerogel.

[0112] Example 11

[0113] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Embodiment 1, except that the silica aerogel in the heat-resistant modifier in step S2 is added after modification treatment, and the specific operation is as follows: after mixing vinyltriethoxysilane and an ethanol solution with a mass concentration of 30% according to a mass ratio of 1:4, the silica aerogel is added for impregnation treatment, after impregnation treatment for 30 min, maleic anhydride-styrene copolymer is added, and after reaction at 70°C for 30 min, the modified silica aerogel is obtained by filtration and drying, and is added according to the method in Embodiment 1.

[0114] wherein the addition amount of vinyltriethoxysilane is 5wt% of the silica aerogel, and the addition amount of maleic anhydride-styrene copolymer is 10wt% of the silica aerogel.

[0115] Embodiment 12

[0116] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Embodiment 9, except that when the silica aerogel is modified, maleic anhydride-styrene copolymer is not added, and the same amount of KH-550 is used to replace the vinyltriethoxysilane, and the specific operation is as follows:

[0117] After mixing KH-550 and an ethanol solution with a mass concentration of 30% according to a mass ratio of 1:4, the silica aerogel is added for impregnation treatment, after impregnation treatment for 60 min, the modified silica aerogel is obtained by filtration and drying, and is added according to the method in Embodiment 1, wherein the addition amount of KH-550 is 4wt% of the silica aerogel.

[0118] Comparative Example 1-2

[0119] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Embodiment 1, except that in step S2, the Peek-silica composite modifier is selected from the Peek-silica composite modifiers prepared in Comparative Preparation Examples 1-2.

[0120] Comparative Example 3

[0121] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Embodiment 1, except that in step S2, the Peek-silica composite modifier is replaced by an equal amount of Peek powder.

[0122] Comparative Example 4

[0123] A preparation method of a broken bridge aluminum door and window heat insulation strip is performed according to the method in Embodiment 1, except that in step S2, the Peek-silica composite modifier is replaced by an equal amount of a mixture of Peek powder and silica, and the mass ratio of the addition of the Peek powder to the silica is 1:1.6.

[0124] Comparative Example 5

[0125] A method for preparing thermal break strips for aluminum alloy windows and doors is carried out according to the method in Example 1, except that the heat-resistant modifier in step S2 is silica aerogel.

[0126] Comparative Example 6

[0127] A method for preparing thermal break strips for aluminum alloy windows and doors is carried out according to the method in Example 1, except that in step S2, the Peek-silica composite modifier is replaced by an equal amount of silica modifier, the silica modifier is prepared according to the method in Example 1, and in step 1), the loaded silica is replaced by an equal amount of silica.

[0128] Performance testing

[0129] The thermal insulation strips prepared in the above embodiments and comparative examples were tested for tensile strength according to GB / T 1040.2-2006 "Test Method for Tensile Properties of Plastics" at a tensile rate of 50 mm / min; and for flexural strength according to GB / T 9341-2008 "Determination of Flexural Properties of Plastics" at a flexural strength test rate of 20 mm / min. The test results are shown in Table 1.

[0130] In addition, the heat insulation strips prepared in the above embodiments and comparative examples were placed in a heat aging test chamber and subjected to accelerated aging test at 150°C for 500 hours. The retention rate of mechanical properties before and after heat aging was tested to detect their heat resistance. The test results are shown in Table 1 below.

[0131] Table 1:

[0132]

[0133] Based on the test results in Table 1 above, in this embodiment, after Peek is loaded onto silica and polymerized in situ to form a core-shell structure, and combined with silica aerogel as a heat-resistant modifier, the resulting thermal insulation strip has excellent mechanical properties. After heat aging treatment, the mechanical properties remain excellent, and it has good heat resistance. Under long-term high-temperature conditions, it maintains excellent mechanical properties to meet the comprehensive needs of high-end door and window systems.

[0134] Referring to the test results of Example 1 and Examples 4-6, it can be seen that when the Peek is loaded on the silica, the active groups are introduced after the plasma treatment of the Peek, and the surface modification treatment of the Peek also introduces the amino silane coupling agent, PAMAM and genipin. The introduction of the above-mentioned substances can introduce functional groups such as amino groups on the surface of the silica, and then further in-situ polymerize with the subsequent monomers and form a cross-linked structure through genipin, thereby further significantly improving the mechanical properties and heat resistance of the heat insulation strip. In combination with the test results of Example 7 and Example 8, when the Peek is loaded on the silica, the mechanical properties are reduced and the heat resistance is also reduced without adding PAMAM. The addition of PAMAM can introduce macromolecular amino groups, and when the amide is cross-linked through genipin, a three-dimensional macromolecular network structure can be formed to further improve the performance. In Example 8, the mechanical properties and heat resistance are reduced when the Peek is only subjected to plasma treatment to introduce active functional groups without introducing macromolecular amino molecules and the like.

[0135] In combination with the test results of Example 1 and Examples 9-11, it can be seen that the mechanical properties and heat resistance of the heat insulation strip can be further improved after the modification treatment of the silica aerogel. In combination with the test results of Example 12, the mechanical properties and heat resistance of the silica aerogel are reduced compared to Example 9 when the silica aerogel is only subjected to amino silane coupling agent treatment. In combination with the test results of Example 1 and Comparative Examples 1-2, the heat resistance and mechanical properties of the heat insulation strip are reduced in Comparative Example 1 when the Peek powder is loaded on the silica and subjected to ordinary silane coupling agent treatment without in-situ polymerization treatment. The formation of the core-shell structure significantly improves the compatibility with the polyamide system. In combination with the performance reduction in Comparative Example 2 when the N-hydroxyethyl acrylamide is not added to the mixed monomers, the introduction of the amide group significantly improves the compatibility and further improves the mechanical properties and heat resistance.

[0136] In combination with the test results of Example 1 and Comparative Example 3, it can be seen that when the heat-resistant modifier is selected as the silica aerogel and the Peek powder, the agglomeration of the Peek powder and the compatibility with the polyamide directly result in a significant decrease in the heat resistance and mechanical properties. In Comparative Example 4, when the Peek powder and the silica are directly mixed and then added, the mechanical properties and heat resistance are also significantly reduced. In combination with Comparative Example 5, when only the silica aerogel is selected as the heat-resistant modifier, the properties are significantly reduced. When the silica aerogel and the Peek-silica composite modifier are used for treatment, the mechanical properties and heat resistance are significantly improved. In combination with the test results of Comparative Example 6, when the silica is in-situ polymerized to form a core-shell structure and then added without loading the Peek, the properties are also significantly reduced. In the present application, the Peek-silica composite modifier and the modified silica aerogel are used as the heat-resistant modifier, which significantly improves the mechanical properties and heat resistance of the heat-insulating strip of the broken bridge aluminum door and window.

[0137] The specific embodiments are merely illustrative of the present application, and are not intended to limit the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A thermal break strip for aluminum alloy doors and windows, characterized in that, The raw materials include the following parts by weight: 50-60 parts PA510 granules, 15-30 parts PA10T, 0.1-0.5 parts antioxidant, 0.5-1.5 parts UV absorber, 10-20 parts glass fiber, 3-5 parts silane coupling agent, and 3-8 parts heat-resistant modifier; wherein the heat-resistant modifier includes silica aerogel and Peek-silica composite modifier in a mass ratio of 1:(1.4-1.6). The Peek-silica composite modifier uses silica loaded with Peek powder as the core material and a polymer layer formed by polymerization of N-hydroxyethyl acrylamide, acrylic acid, and methacrylate monomers as the shell layer; the Peek-silica composite modifier is prepared by the following method: 1) Peek powder is mixed with diphenyl sulfone and heated to 200-220℃. After stirring and mixing, an impregnation solution is prepared. Then, silica is added and impregnated under pressure. After cooling and filtration, loaded silica with Peek is obtained. Loaded silica is mixed with hydroxyethyl cellulose and water to prepare a mixed solution. Vinyltriethoxysilane is added to the mixed solution, the pH is adjusted to acidic, and impregnation is continued for 30-40 minutes. After filtration and drying, pretreated silica is obtained. 2) N-hydroxyethyl acrylamide, acrylic acid and methacrylate monomers are mixed and dissolved in an ethanol aqueous solution. Then, an initiator is added, followed by the pretreated silica obtained in step 1). The mixture is heated to 55-65℃ and reacted for 2-3 hours. After cooling, it is filtered and dried to obtain the Peek-silica composite modifier.

2. The thermal break strip for aluminum alloy doors and windows according to claim 1, characterized in that: In the preparation of the Peek-silica composite modifier, in step 1), the mass ratio of Peek powder to silica is 1:(1.5-1.8), the amount of hydroxyethyl cellulose added is 1-3 wt% of the loaded silica, and the amount of vinyltriethoxysilane added is 5-10 wt% of the loaded silica; in step 2), the mass ratio of N-hydroxyethyl acrylamide, acrylic acid, and methacrylate added is 1:(0.5-0.8):(0.6-0.8), and the mass ratio of the sum of N-hydroxyethyl acrylamide, acrylic acid, and methacrylate monomers to the pretreated silica is 1:(1.1-1.3), and the amount of initiator added is 1-3 wt% of the sum of N-hydroxyethyl acrylamide, acrylic acid, and methacrylate monomers.

3. The thermal break strip for aluminum alloy windows and doors according to claim 1, characterized in that: When preparing the Peek-silica composite modifier, the pressure impregnation parameters in step 1) are: impregnation pressure of 0.5-0.8MPa and impregnation time of 1-2h.

4. The thermal break strip for aluminum alloy doors and windows according to claim 1, characterized in that: In the preparation of Peek-silica composite modifier, in step 1), Peek powder is added after being treated with oxygen plasma, and PAMAM, genipin and γ-aminopropyltrimethoxysilane are also added at the same time as vinyltriethoxysilane in step 1).

5. The thermal break strip for aluminum alloy doors and windows according to claim 4, characterized in that: The mass ratio of γ-aminopropyltrimethoxysilane to vinyltriethoxysilane is 1:(2-3), the amount of genipin added is 0.3-0.8 wt% of silica, and the amount of PAMAM added is 1-3 wt% of silica.

6. The thermal break strip for aluminum alloy doors and windows according to claim 4, characterized in that: The plasma parameters were: Peek powder was treated for 1-3 minutes at a power of 120-150W and an oxygen flow rate of 50-80 sccm.

7. The thermal break strip for aluminum alloy doors and windows according to claim 1, characterized in that: The silica aerogel was added after modification treatment. The specific modification treatment was as follows: the silica aerogel was first impregnated in an ethanol aqueous solution of vinyltriethoxysilane, and then maleic anhydride-styrene copolymer was added. After reacting at 55-70℃ for 30-40 min, it was filtered and dried.

8. A thermal break strip for aluminum alloy doors and windows according to claim 7, characterized in that: When modifying silica aerogel, the amount of vinyltriethoxysilane added is 3-5 wt% of silica aerogel, and the amount of maleic anhydride-styrene copolymer added is 5-10 wt% of silica aerogel.

9. A method for preparing a thermal break strip for aluminum alloy windows and doors as described in any one of claims 1-8, characterized in that: Includes the following steps: Dissolve a silane coupling agent in 2-3 times its mass of ethanol solution, then add glass fiber and impregnate for 30-60 minutes, then dry to obtain pretreated glass fiber; mix PA510 particles and PA10T, then add antioxidant, ultraviolet absorber, pretreated glass fiber and heat-resistant modifier in sequence, mix and stir to obtain a mixture, then melt and extrude the mixture and cool and shape it to obtain thermal break strips for aluminum alloy windows and doors.

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