Flexible spacing bar for hollow glass and preparation method thereof

Abstract

The invention relates to a flexible spacing bar for hollow glass and a preparation method thereof, and the spacing bar comprises 100 parts of silicone rubber, 30-50 parts of a molecular sieve, 40-60 parts of a filler, 10-20 parts of modified polytetrafluoroethylene, 3-7 parts of a microsphere foaming agent, 1-2 parts of a silane coupling agent and 3-5 parts of a vulcanizing agent. The modified polytetrafluoroethylene is a polytetrafluoroethylene / carbon nanotube composite material or a polytetrafluoroethylene / graphene composite material, and the filler is carbon nanomaterial composite polytetrafluoroethylene aerogel and silicon dioxide aerogel. According to the flexible spacing bar disclosed by the invention, carbon nanomaterial composite polytetrafluoroethylene aerogel and silicon dioxide aerogel with a porous structure are added into a silicone rubber base material to serve as fillers, so that the heat insulation performance and the physical and mechanical properties of the flexible spacing bar are improved, and the mechanical properties of the spacing bar are enhanced by adding modified polytetrafluoroethylene; and the spacing bars are correspondingly deformed along with the expansion and contraction movement of the hollow glass, so that the stress generated by thermal expansion difference can be effectively buffered and dissipated.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber products, and in particular relates to a flexible spacer strip for insulating glass and a preparation method thereof. Background Art

[0002] The basic energy-saving measure to solve the energy consumption of doors and windows is to vigorously promote the use of high-performance insulating glass. As an important component of high-performance insulating glass, spacers play a very critical role in thermal insulation.

[0003] At present, the main material of spacers on the market is rigid spacers (aluminum spacers wrapped with spherical molecular sieves). The thermal conductivity of pure aluminum is about 218W / (m*K), and the thermal conductivity of aluminum alloy is generally 120-150 W / (m*K). The thermal resistance of the edge of the insulating glass is much smaller than that of the middle part, which is very unfavorable to reduce the energy consumption of the insulating glass. In addition, for traditional aluminum spacers (aluminum spacers wrapped with spherical molecular sieves), due to the rigidity of aluminum metal, it cannot absorb and buffer the stress generated by the movement of the glass, which leads to the possibility of the insulating glass bursting. Summary of the invention

[0004] The object of the present invention is to provide a flexible spacer for insulating glass, which has excellent thermal insulation performance, physical and mechanical properties, stress elimination ability and sealing ability.

[0005] The technical solution adopted by the present invention to solve the above problem is: a flexible spacer for insulating glass, comprising the following components in parts by mass: Silicone rubber 100 parts Molecular sieve 30-50 parts Filler 40-60 parts Modified polytetrafluoroethylene 10-20 parts 3-7 parts of microsphere foaming agent Silane coupling agent 1-2 parts 3-5 parts of vulcanizing agent The modified polytetrafluoroethylene is a polytetrafluoroethylene / carbon nanotube composite material or a polytetrafluoroethylene / graphene composite material; The filler is a composite of carbon nanomaterial composite polytetrafluoroethylene aerogel and silicon dioxide aerogel.

[0006] Preferably, the molecular sieve is powdered 3A molecular sieve; the microsphere foaming agent is at least one of microsphere foaming agent HDU-80 and microsphere foaming agent LDU-80; and the silane coupling agent is silane coupling agent SI-69.

[0007] Preferably, the vulcanizing agent is a compound of platinum vulcanizing agent C-25B and platinum vulcanizing agent C-25A.

[0008] Preferably, the polytetrafluoroethylene / carbon nanotube composite material is prepared by the following preparation method: adding carbon nanotubes to a concentrated nitric acid solution, washing and drying after oxidation treatment, mixing the oxidized carbon nanotubes with polytetrafluoroethylene powder, and ultrasonically dispersing them in a solvent, and then melt-mixing and extruding to obtain the polytetrafluoroethylene / carbon nanotube composite material.

[0009] Preferably, the polytetrafluoroethylene / graphene composite material is prepared by the following preparation method: graphene and polytetrafluoroethylene powder are mixed and ultrasonically dispersed in a solvent, and then the polytetrafluoroethylene / graphene composite material is obtained by melt mixing and extrusion molding.

[0010] Preferably, the mass ratio of the carbon nanomaterial composite polytetrafluoroethylene aerogel and the silicon dioxide aerogel is 2-3:1.

[0011] Preferably, the carbon nanomaterial composite polytetrafluoroethylene aerogel is prepared by the following preparation method: adding carbon nanotube aqueous dispersion to polytetrafluoroethylene aqueous emulsion, mixing evenly and then heating to obtain a carbon material-polytetrafluoroethylene mixed solution, then mixing with an agar solution, placing in an ice water bath to form a gel, and then freezing, freeze-drying and calcining the gel to obtain a carbon nanotube composite polytetrafluoroethylene aerogel.

[0012] Another object of the present invention is to provide a method for preparing a flexible spacer for insulating glass, comprising the following steps: (1) Add silicone rubber, modified polytetrafluoroethylene and filler into a mixer, then add powdered 3A molecular sieve several times and mix to obtain a mixed material; (2) Add the mixed material, microsphere foaming agent and silane coupling agent into an internal mixer, add the vulcanizing agent after internal mixing, knead at high speed and then transport to an open mixer; (3) The mixed material in step (2) is thinly passed through an open mill for 2 to 4 times to fully mix the silicone rubber, modified polytetrafluoroethylene and filler, and then fed into a screw extruder to extrude and form long strips for later use; (4) Place the extruded strips into an oven for vulcanization to obtain flexible spacer strips.

[0013] Preferably, the strips are 20*5mm strips.

[0014] Preferably, the vulcanization temperature in step (4) is 170-190° C., and the vulcanization time is 3-7 min.

[0015] Compared with the prior art, the advantages of the present invention are: (1) The present invention adds a composite of carbon nanomaterial composite polytetrafluoroethylene aerogel and silicon dioxide aerogel as a filler to a silicone rubber substrate. Both of them have a porous structure, which not only has a strong elastic memory function and can reduce the stress of the insulating glass, but also greatly improves the thermal insulation performance and physical and mechanical properties of the flexible spacer. Among them, the silicon dioxide aerogel has extremely low thermal conductivity and can effectively improve the thermal insulation performance of the flexible spacer. The carbon nanomaterial composite polytetrafluoroethylene aerogel is resistant to high temperature, has good chemical stability, and can greatly improve the mechanical strength.

[0016] (2) The addition of modified polytetrafluoroethylene in the present invention can not only enhance the mechanical properties of the flexible spacer, improve the overall stability and sealing of the material, and reduce the permeability of water and gas, but also make the spacer deform accordingly when the insulating glass expands and contracts, which can effectively buffer and dissipate the stress generated by the thermal expansion difference, thereby minimizing the possibility of the insulating glass bursting and increasing the sealing life of the insulating glass. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the embodiments. Example 1

[0018] A flexible spacer strip for insulating glass, comprising the following components in parts by mass: Silicone rubber 100 parts Molecular sieve 40 parts Filler 50 parts Modified polytetrafluoroethylene 15 parts 5 parts of microsphere foaming agent Silane coupling agent 2 parts 4 parts of vulcanizing agent Wherein, the modified polytetrafluoroethylene is a polytetrafluoroethylene / carbon nanotube composite material.

[0019] The filler is a composite of carbon nanomaterials, polytetrafluoroethylene aerogel and silicon dioxide aerogel in a mass ratio of 2:1.

[0020] The molecular sieve is powdered 3A molecular sieve, the microsphere foaming agent is microsphere foaming agent HDU-80, and the silane coupling agent is silane coupling agent SI-69.

[0021] The vulcanizing agent is a compound of platinum vulcanizing agent C-25B and platinum vulcanizing agent C-25A in a mass ratio of 1:1.

[0022] The polytetrafluoroethylene / carbon nanotube composite material is prepared by the following preparation method: 10g of carbon nanotubes are added to 200ml of concentrated nitric acid solution, oxidized for 2h, washed with deionized water and dried, the oxidized carbon nanotubes are mixed with 20g of polytetrafluoroethylene powder, ultrasonically dispersed in dichlorobenzene solvent, and then melt-mixed and extruded to obtain the polytetrafluoroethylene / carbon nanotube composite material.

[0023] The carbon nanomaterial composite polytetrafluoroethylene aerogel is prepared by the following preparation method: 3% carbon nanotube aqueous dispersion is added to a polytetrafluoroethylene aqueous emulsion with a solid content of 50%, the mixture is evenly mixed, and then heated at 45°C to obtain a carbon material-polytetrafluoroethylene mixed solution (wherein the mass of polytetrafluoroethylene is twice the mass of carbon nanotubes), and then mixed with a 1% agar aqueous solution, placed in an ice water bath to form a gel, and then the gel is frozen (-40°C), freeze-dried (24h), and calcined (400°C) to obtain a carbon nanotube composite polytetrafluoroethylene aerogel.

[0024] A method for preparing a flexible spacer for insulating glass comprises the following steps: (1) Add silicone rubber, modified polytetrafluoroethylene and filler into a mixer, then add powdered 3A molecular sieve in multiple times, mix at 130° C. for 7 minutes to obtain a mixed material; (2) Add the mixed material, microsphere foaming agent and silane coupling agent into an internal mixer and mix for 10 minutes, then add the vulcanizing agent, knead at high speed and then transport to an open mixer; (3) After the mixed material in step (2) is thinly passed through an open mill for three times, the silicone rubber, modified polytetrafluoroethylene and filler are fully mixed and uniformly fed into a screw extruder and extruded into 20*5 mm long strips for later use; (4) Place the extruded strips into an oven for vulcanization at a temperature of 170°C for 7 minutes to obtain flexible spacer strips. Example 2

[0025] A flexible spacer strip for insulating glass, comprising the following components in parts by mass: Silicone rubber 100 parts Molecular sieve 30 parts Filler 50 parts Modified polytetrafluoroethylene 20 parts 7 parts of microsphere foaming agent Silane coupling agent 2 parts 5 parts of vulcanizing agent Modified polytetrafluoroethylene is polytetrafluoroethylene / graphene composite material; The filler is a composite of carbon nanomaterial, polytetrafluoroethylene aerogel and silicon dioxide aerogel in a mass ratio of 2:1.

[0026] The molecular sieve is powdered 3A molecular sieve, the microsphere foaming agent is microsphere foaming agent HDU-80, and the silane coupling agent is silane coupling agent SI-69.

[0027] The vulcanizing agent is a compound of platinum vulcanizing agent C-25B and platinum vulcanizing agent C-25A in a mass ratio of 1:1.

[0028] The polytetrafluoroethylene / graphene composite material is prepared by the following preparation method: graphene treated with oxidation (graphene treated with concentrated nitric acid) and polytetrafluoroethylene powder are mixed in a mass ratio of 1:10, and ultrasonically dispersed in a dichlorobenzene solvent, and then melt-mixed and extruded to obtain the polytetrafluoroethylene / graphene composite material.

[0029] The carbon nanomaterial composite polytetrafluoroethylene aerogel is prepared by the following preparation method: 3% carbon nanotube aqueous dispersion is added to a polytetrafluoroethylene aqueous emulsion with a solid content of 50%, the mixture is evenly mixed, and then heated at 45°C to obtain a carbon material-polytetrafluoroethylene mixed solution (wherein the mass of polytetrafluoroethylene is twice the mass of carbon nanotubes), and then mixed with a 1% agar aqueous solution, placed in an ice water bath to form a gel, and then the gel is frozen (-40°C), freeze-dried (24h), and calcined (400°C) to obtain a carbon nanotube composite polytetrafluoroethylene aerogel.

[0030] A method for preparing a flexible spacer for insulating glass comprises the following steps: (1) Add silicone rubber, modified polytetrafluoroethylene and filler into a mixer, then add powdered 3A molecular sieve in multiple times, mix at 135° C. for 5 minutes to obtain a mixed material; (2) Add the mixed material, microsphere foaming agent and silane coupling agent into an internal mixer and mix for 8 minutes, then add the vulcanizing agent, knead at high speed and then transport to an open mixer; (3) The mixed material in step (2) is thinly passed through an open mill for 4 times to fully mix the silicone rubber, modified polytetrafluoroethylene and filler, and then fed into a screw extruder to extrude and form 20*5 mm long strips for later use; (4) Place the extruded strips into an oven for vulcanization at a temperature of 180°C for 5 minutes to obtain flexible spacer strips. Example 3

[0031] A flexible spacer strip for insulating glass, comprising the following components in parts by mass: Silicone rubber 100 parts Molecular sieve 50 parts Filler 40 parts Modified polytetrafluoroethylene 15 parts 4 parts of microsphere foaming agent Silane coupling agent 2 parts 3 parts of vulcanizing agent Wherein, the modified polytetrafluoroethylene is a polytetrafluoroethylene / carbon nanotube composite material.

[0032] The filler is a composite of carbon nanomaterials, polytetrafluoroethylene aerogel and silicon dioxide aerogel in a mass ratio of 2:1.

[0033] The molecular sieve is powdered 3A molecular sieve, the microsphere foaming agent is microsphere foaming agent LDU-80, and the silane coupling agent is silane coupling agent SI-69.

[0034] The vulcanizing agent is a compound of platinum vulcanizing agent C-25B and platinum vulcanizing agent C-25A in a mass ratio of 2:1.

[0035] The polytetrafluoroethylene / carbon nanotube composite material is prepared by the following preparation method: 10g of carbon nanotubes are added to 200ml of concentrated nitric acid solution, oxidized for 2h, washed with deionized water and dried, the oxidized carbon nanotubes are mixed with 20g of polytetrafluoroethylene powder, ultrasonically dispersed in dichlorobenzene solvent, and then melt-mixed and extruded to obtain the polytetrafluoroethylene / carbon nanotube composite material.

[0036] The carbon nanomaterial composite polytetrafluoroethylene aerogel is prepared by the following preparation method: 3% carbon nanotube aqueous dispersion is added to a polytetrafluoroethylene aqueous emulsion with a solid content of 50%, the mixture is evenly mixed, and then heated at 45°C to obtain a carbon material-polytetrafluoroethylene mixed solution (wherein the mass of polytetrafluoroethylene is twice the mass of carbon nanotubes), and then mixed with a 1% agar aqueous solution, placed in an ice water bath to form a gel, and then the gel is frozen (-40°C), freeze-dried (24h), and calcined (400°C) to obtain a carbon nanotube composite polytetrafluoroethylene aerogel.

[0037] A method for preparing a flexible spacer for insulating glass comprises the following steps: (1) Add silicone rubber, modified polytetrafluoroethylene and filler into a mixer, then add powdered 3A molecular sieve in multiple times, mix at 130° C. for 7 minutes to obtain a mixed material; (2) Add the mixed material, microsphere foaming agent and silane coupling agent into an internal mixer and mix for 10 minutes, then add the vulcanizing agent, knead at high speed and then transport to an open mixer; (3) After the mixed material in step (2) is thinly passed through an open mill for three times, the silicone rubber, modified polytetrafluoroethylene and filler are fully mixed and uniformly fed into a screw extruder and extruded into 20*5 mm long strips for later use; (4) Put the extruded strips into an oven for vulcanization at a temperature of 180°C and a vulcanization time of 7 minutes to obtain flexible spacer strips.

[0038] Comparative Example 1 The only difference from Example 1 is that all of the silica aerogel, namely 50 parts, is added.

[0039] Comparative Example 2 The only difference from Example 1 is that all carbon nanomaterial composite polytetrafluoroethylene aerogel is added, namely 50 parts.

[0040] Comparative Example 3 The only difference from Example 1 is that no modified polytetrafluoroethylene is added.

[0041] Comparative Example 4 The only difference from Example 1 is that "modified polytetrafluoroethylene" is replaced by "polytetrafluoroethylene".

[0042] The various properties of the flexible spacers prepared in Examples 1-3 and Comparative Examples 1-4 were tested, and the test results are shown in Table 1: Table 1 Performance test results of the flexible spacers prepared in Examples 1-3 and Comparative Examples 1-4

[0043] As can be seen from Table 1, the mechanical properties and resilience of the spacer bar in Example 1, which is a composite of modified polytetrafluoroethylene and carbon nanomaterial composite polytetrafluoroethylene aerogel and silica aerogel, are better than those in Comparative Examples 1-4, so that the spacer bar can undergo corresponding deformation as the insulating glass expands and contracts, and can effectively buffer and dissipate the stress generated by the thermal expansion difference.

[0044] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A flexible spacer for insulating glass, characterized in that: The composition includes the following components in parts by weight: Silicone rubber 100 parts Molecular sieve 30-50 parts Filler 40-60 parts Modified polytetrafluoroethylene 10-20 parts 3-7 parts of microsphere foaming agent Silane coupling agent 1-2 parts 3-5 parts of vulcanizing agent The modified polytetrafluoroethylene is a polytetrafluoroethylene / carbon nanotube composite material or a polytetrafluoroethylene / graphene composite material; The filler is a composite of carbon nanomaterial composite polytetrafluoroethylene aerogel and silicon dioxide aerogel.

2. The flexible spacer for insulating glass according to claim 1, characterized in that: The molecular sieve is powdered 3A molecular sieve; the microsphere foaming agent is at least one of microsphere foaming agent HDU-80 and microsphere foaming agent LDU-80; and the silane coupling agent is silane coupling agent SI-69.

3. The flexible spacer for insulating glass according to claim 1, characterized in that: The vulcanizing agent is a compound of platinum vulcanizing agent C-25B and platinum vulcanizing agent C-25A.

4. The flexible spacer for insulating glass according to claim 1, characterized in that: The polytetrafluoroethylene / carbon nanotube composite material is prepared by the following preparation method: adding carbon nanotubes into concentrated nitric acid solution, washing and drying after oxidation treatment, mixing the oxidized carbon nanotubes with polytetrafluoroethylene powder, ultrasonically dispersing them in a solvent, and then melt-mixing and extruding to obtain the polytetrafluoroethylene / carbon nanotube composite material.

5. The flexible spacer for insulating glass according to claim 1, characterized in that: The polytetrafluoroethylene / graphene composite material is prepared by the following preparation method: graphene and polytetrafluoroethylene powder are mixed, ultrasonically dispersed in a solvent, and then melt-mixed and extruded to obtain the polytetrafluoroethylene / graphene composite material.

6. The flexible spacer for insulating glass according to claim 1, characterized in that: The mass ratio of the carbon nanomaterial composite polytetrafluoroethylene aerogel and the silicon dioxide aerogel is 2-3:

1.

7. The flexible spacer for insulating glass according to claim 1, characterized in that: The carbon nano material composite polytetrafluoroethylene aerogel is prepared by the following preparation method: adding carbon nanotube aqueous dispersion into polytetrafluoroethylene aqueous emulsion, mixing evenly and then heating to obtain a carbon material-polytetrafluoroethylene mixed solution, then mixing with an agar solution, placing in an ice water bath to form a gel, and then freezing, freeze-drying and calcining the gel to obtain the carbon nano tube composite polytetrafluoroethylene aerogel.

8. A method for preparing a flexible spacer for insulating glass according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Add silicone rubber, modified polytetrafluoroethylene and filler into a mixer, then add powdered 3A molecular sieve several times and mix to obtain a mixed material; (2) Add the mixed material, microsphere foaming agent and silane coupling agent into an internal mixer, add the vulcanizing agent after internal mixing, knead at high speed and then transport to an open mixer; (3) The mixed material in step (2) is thinly passed through an open mill for 2 to 4 times to fully mix the silicone rubber, modified polytetrafluoroethylene and filler, and then fed into a screw extruder to extrude and form long strips for later use; (4) Place the extruded strips into an oven for vulcanization to obtain flexible spacer strips.

9. The method for preparing a flexible spacer for insulating glass according to claim 8, characterized in that: The strips are 20*5mm long strips.

10. The method for preparing a flexible spacer for insulating glass according to claim 8, characterized in that: The vulcanization temperature in step (4) is 170-190° C., and the vulcanization time is 3-7 min.

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