CN115854174B - Low coefficient of thermal conductivity's heat preservation water gauge case - Google Patents
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- CN115854174B CN115854174B CN202211426264.4A CN202211426264A CN115854174B CN 115854174 B CN115854174 B CN 115854174B CN 202211426264 A CN202211426264 A CN 202211426264A CN 115854174 B CN115854174 B CN 115854174B
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Abstract
The invention relates to the technical field of water meter boxes, and discloses a heat-insulating water meter box with low heat conductivity, which comprises a box cover and a box body which is matched with the box cover in a sealing way through a lock catch, wherein the inner walls of the box cover and the box body are adhered with a heat-insulating layer with low heat conductivity, and the box cover and the box body are respectively molded by adopting SMC (sheet molding compound) composite materials; the low-heat-conduction heat-preservation layer comprises polystyrene foam bonded with the inner wall and a coating layer vacuum-molded on the polystyrene foam; the coating layer comprises the following raw materials in parts by weight: 80-100 parts of polystyrene resin; 2-10 parts of ethylene propylene diene monomer rubber; 1-10 parts of heat insulation filler; 5-15 parts of compatilizer; the heat insulation filler is a mixture of glass beads, nano aluminum silicate and a silane coupling agent. The coating material is coated outside the heat-insulating layer through the plastic sucking process, so that the heat-insulating and sealing effects of the water meter are improved, the protection grade of the obtained water meter heat-insulating box reaches the highest IP66 grade, and the water meter can be effectively prevented from being corroded and damaged by moist air or dust immersed in the box.
Description
Technical Field
The invention relates to the technical field of water meter boxes, in particular to a heat-preserving water meter box with low heat conductivity coefficient.
Background
The water meter box is a common civil infrastructure, is widely applied to civil infrastructures of villages and towns, large, medium and small cities, and mainly has the function of protecting the water meter. In the actual environment, the aging loss speed of the water meter is high due to the change of the external environment, such as the temperature rise, and the water meter is easy to be frozen in cold winter environment, especially in northern areas; and in the using process, the factors such as moist air, dust and the like can enter the box body to damage the water meter, so that the service life of the water meter is shortened, and the maintenance and replacement cost is increased.
Most of water meter boxes in the prior art adopt a mode of designing an insulating layer in the box body to improve the insulating effect of the water meter box so as to resist the influence of temperature change on the water meter. As disclosed in CN107588821a, a super cold-resistant, anti-freezing and anti-corrosion water meter box comprises a box body, wherein the box body is hinged with a box door; the water meter is arranged in the box body, the heat insulation structure is embedded around the water meter and comprises a heat insulation block coated on the periphery of the water meter, and the heat tracing belt is embedded in the heat insulation block; but the structural design is complex, the preparation process is complex, and the cost is high.
CN 214621346U discloses an antifreezing water meter insulation can, which comprises a box body, the surface of box articulates there is the chamber door, the left side fixedly connected with hinge of chamber door, the fixed surface of chamber door is connected with the lock, the surface of lock is provided with the key hole, the bleeder vent has been seted up on the surface of box, the equal fixedly connected with curb plate in both sides bottom of box, the equal fixedly connected with stationary blade in both sides of box, the inner wall fixedly connected with sealing strip of box, the inner wall of box has set gradually rubber and plastic foaming board, foam, aluminium foil plastic-coated from outer to interior.
The heat preservation layer of the water meter heat preservation box is made of polyethylene foam, polystyrene foam, polyamide foam and other materials, but the surface hardness of the foam is not high, the foam is very easy to wear and scratch under the action of external force, a method of sticking a protective film or wrapping a metal aluminum protective film is often adopted in the prior art, but the problems that sticking is uneven, the lead angle is difficult to wrap effectively, the bonding with the foam layer is not tight and easy to separate and the like exist. In addition, the structural design of the improved method of the water meter insulation can in the prior art is complex, the water vapor barrier property of the box body is not high, the heat conductivity coefficient is high, and the insulation effect is not ideal.
Disclosure of Invention
Aiming at the problems of unsatisfactory heat preservation and sealing effects or high cost caused by excessively complex structural design of a water meter heat preservation box in the prior art, the invention provides the water meter heat preservation box which is prepared by coating a coating material outside the heat preservation layer through a plastic sucking process, and on the basis of a simple water meter box structure, the heat preservation and sealing effects of the water meter heat preservation are greatly improved by changing a layer of preparation process and material, the obtained water meter heat preservation box has low heat conductivity, the protection grade reaches the highest IP66 grade, and the corrosion and damage to the water meter caused by the invasion of humid air or dust into the box body can be effectively avoided.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the heat-insulating water meter box with the low heat conductivity coefficient comprises a box cover and a box body which is in sealing fit with the box cover through a lock catch, wherein the inner walls of the box cover and the box body are adhered with a heat-insulating layer with low heat conductivity, and the box cover and the box body are respectively molded by adopting SMC composite materials;
the low-heat-conduction heat-preservation layer comprises polystyrene foam bonded with the inner wall and a coating layer vacuum-molded on the polystyrene foam; the coating layer comprises the following raw materials in parts by weight:
80-100 parts of polystyrene resin;
2-10 parts of ethylene propylene diene monomer rubber;
1-10 parts of heat insulation filler;
5-15 parts of compatilizer;
the heat insulation filler is a mixture of glass beads, nano aluminum silicate and a silane coupling agent.
According to the invention, the polystyrene-based coating material is coated on the surface of the polystyrene foam, so that the problem that the surface of the polystyrene foam heat-insulating layer is easily scratched is solved, and the cleaning is convenient; on the one hand, the heat preservation and insulation effect of the whole water meter box can be improved, the overall air tightness, waterproof and dampproof effects are improved, the two material main bodies are polystyrene, and the adhesion is better.
However, the coating layer of polystyrene is thin and brittle, has poor toughness and high water vapor transmittance, so that the raw materials of the coating layer are further modified, the ethylene propylene rubber has self-viscosity and excellent chemical corrosion resistance, the ethylene propylene diene monomer is selected to improve the toughness and viscosity of the system, the heat-insulating filler reduces the heat conductivity coefficient of the coating layer, the heat insulation property is improved, and the compatibility effect among the components is better by assisting with a compatilizer.
The key lies in the compound formula of the heat insulation filler, the applicant selects a plurality of heat insulation auxiliary agents to try, the effect of adopting a single component is not ideal, in particular, the toughness of the cladding material is obviously reduced after the addition amount of glass beads is large, when the glass beads and nano aluminum silicate are adopted to be matched for use, the heat conduction performance of the cladding material is greatly improved, but the toughness and the viscosity of the cladding material are not very good, the cladding material is not tightly attached to polystyrene foam, and is easily separated under the action of external force, after the silane coupling agent is added, the toughness reduction of the cladding material can be relieved, the viscosity of the cladding material can be improved by being matched with ethylene propylene diene monomer rubber, the cladding material is tightly attached to the polystyrene foam, and the comprehensive performance of a water meter heat insulation box is improved.
The mass ratio of the glass beads, the nano aluminum silicate and the silane coupling agent in the heat insulation filler is 0.5-3:0.5-5:2-6. The content of glass beads and nano aluminum silicate is not too high, and is usually less than 5 parts, preferably less than 3 parts, so as to ensure the toughness of the system and the effective tackifying effect of the silane coupling agent.
Preferably, the mass ratio of the glass beads, the nano aluminum silicate and the silane coupling agent in the heat insulation filler is 0.5-2:0.5-2:2-6; the air tightness and the fit of the coating layer in the water meter box obtained in the proportion are better.
Further preferably, the mass ratio of the glass beads, the nano aluminum silicate and the silane coupling agent is 1:1.5:5.
Preferably, the raw materials of the coating layer comprise the following components in parts by weight:
80-90 parts of polystyrene resin;
2-8 parts of ethylene propylene diene monomer rubber;
3-8 parts of heat insulation filler;
5-15 parts of compatilizer.
The compatilizer is one or more of maleic anhydride, POE-g-GMA and EVA-g-MA.
The particle size of the glass beads is 2-10 microns; the grain diameter of the nano aluminum silicate is 5-50nm; the silane coupling agent comprises one or more than two of KH-550 (gamma-aminopropyl triethoxysilane), KH-560 (gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane) or KH-570 (gamma-methacryloxypropyl trimethoxysilane);
the case cover or the case body is bonded with polystyrene foam by polyacrylic resin, hot melt adhesive or vinyl polymer;
the sealing part of the box cover and the box body is provided with a rubber sealing layer.
Preferably, the bonding is carried out by adopting vinyl polymers, such as Jinghuo H-1507, and the product is vinyl polymers, and has better bonding effect similar to the components in polystyrene;
the preparation process of the low-heat-conduction heat-preservation layer comprises the following steps:
preparing polystyrene foam matched with the inner wall of the water meter box in size; replacing a mould in a plastic sucking machine with the polystyrene foam, and fixing a coating material above the polystyrene foam by using a clamp; and heating the coating material through a heating room on a vacuum plastic sucking machine, then pressing the coating material down onto polystyrene foam, vacuumizing air between the coating material and the polystyrene foam by using a vacuum pump, vacuum-sucking the coating material on the outer layer of the polystyrene foam to form a coating layer, and lowering a die table after the coating layer is cooled and shaped to obtain the low-heat-conductivity heat-insulating layer.
Preferably, the coating material is heated for 30-60s at a thermal temperature of 160-200 ℃;
preferably, the vacuum strength in the vacuum plastic sucking process is-0.095 to-0.1 Mpa; vacuumizing for 8-15s, and cooling the coating for 20-35s.
The preparation process of the coating material comprises the following steps:
step 1, mixing glass beads, nano aluminum silicate and a silane coupling agent to obtain a heat insulation filler;
and 2, melting, mixing, plasticizing, extruding and casting the polystyrene resin, the ethylene propylene diene monomer rubber, the heat insulation filler and the compatilizer into a thick sheet, and carrying out longitudinal stretching and shaping and transverse stretching and shaping to obtain the coating material.
The melting temperature in the step 2 is 200-250 ℃; the preheating temperature of longitudinal stretching is 75-100 ℃; the preheating temperature of transverse stretching is 100-150 ℃;
the heat conductivity coefficient of the low heat conduction heat preservation layer is not higher than 0.035W/(m.K), and the protection level of the heat preservation water meter box is above IP66 level. Preferably, the thermal conductivity is not higher than 0.030W/(mK).
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the polystyrene coating material is coated on the surface of the polystyrene foam, so that the problem that the surface of the polystyrene foam heat-insulating layer is easily scratched is solved, and the cleaning is convenient; on the one hand, the heat preservation and insulation effect of the whole water meter box can be improved, the overall air tightness, waterproof and moistureproof effects are improved, the heat conductivity coefficient of the obtained water meter heat insulation box is low, the protection level reaches the highest IP66 level, and the water meter can be effectively prevented from being corroded and damaged by moist air or dust immersed in the box body.
(2) According to the invention, a plurality of heat insulation auxiliary agents are selected for cooperation, so that the heat insulation performance and viscosity of the plastic uptake cladding material are improved, the plastic uptake cladding material is tightly attached to polystyrene foam, and the comprehensive performance of the water meter heat insulation box is improved.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. Modifications and equivalents will occur to those skilled in the art upon understanding the present teachings without departing from the spirit and scope of the present teachings.
The raw materials adopted in the following specific embodiments are all purchased in the market, and the particle size of the glass beads is 2-10 microns; the grain diameter of the nano aluminum silicate is 10-20nm, KH-550 is used as the silane coupling agent, H-1507 is used as the adhesive, and POE-g-GMA is used as the compatilizer.
The protection grade of the water meter insulation can is tested according to the GB/T4208-25017 standard, and the heat conductivity coefficient of the low heat conductivity insulation layer is tested according to the GB/T10294-2008 standard. The mechanical property test of the coating material is carried out according to GB 13022-1991.
Example 1
The preparation process of the low-heat-conductivity heat-insulation layer of the heat-insulation water meter box with low heat conductivity coefficient comprises the following steps of:
step 1, mixing glass beads, nano aluminum silicate and KH-550 to obtain a heat insulation filler;
step 2, uniformly mixing polystyrene resin, ethylene propylene diene monomer rubber, the heat insulation filler in the step 1 and POE-g-GMA, adding the mixture into an extruder, and melting and extruding the mixture through the extruder, wherein the melting temperature is 200-220 ℃;
casting the extrudate into thick slices, preheating on a longitudinal stretcher, and longitudinally stretching and shaping at the preheating temperature of 80 ℃; preheating the film on a transverse stretcher, transversely stretching and shaping at the preheating temperature of 120 ℃, trimming and thickness measuring the thin sheet, and winding to obtain a coating material;
step 3, cutting to obtain polystyrene foam matched with the box cover in size; replacing a mould in a plastic sucking machine with the polystyrene foam, and fixing a coating material above the polystyrene foam by using a clamp; heating the coating material by a heating room on a vacuum plastic sucking machine at 170 ℃ for 35s, then pulling the heated coating material out to a designated position above the polystyrene foam by a track, lifting the polystyrene foam to a joint below the heated coating material by a lifting table, arranging an upper die above the coating material, pressing the coating material down on the polystyrene foam, vacuumizing air between the upper die and the lower die by a vacuum pump, wherein the vacuum strength is 0.95Kpa, vacuumizing for 10s, vacuum-sucking the coating material on the outer layer of the polystyrene foam to form a coating layer, cooling for 25s, and setting, and then lowering the die table to obtain the low-heat-conduction heat-preservation layer;
the same method prepares the low heat conduction heat preservation layer matched with the size of the box body.
Examples 2 to 3 and comparative examples 1 to 4
According to the process of example 1, the compositions of the raw materials are adjusted as shown in table 1, and low heat conduction heat preservation layers in different proportions are obtained.
Coating an adhesive Jinghong H-1507 on the inner layer of the water meter box body of the SMC composite material prepared in advance, attaching the low-heat-conductivity heat-insulation layer to the box cover and the inner wall of the box body, sealing the sealing part of the box cover and the box body by rubber, and connecting the box cover and the box body by matching with two groups of connecting buckles to obtain the heat-insulation water meter box with low heat-conductivity coefficient.
Table 1 raw material compositions of examples and comparative examples
| Raw material type | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Polystyrene | 85 | 85 | 90 | 85 | 85 | 85 | 85 |
| Ethylene propylene diene monomer | 5 | 10 | 6 | 0 | 5 | 0 | 5 |
| Glass bead | 1 | 1 | 1.5 | 1 | 3 | 1 | 1 |
| Nanometer aluminum silicate | 1.5 | 1.5 | 1.5 | 1.5 | 3 | 1.5 | 0 |
| Silane coupling agent | 5 | 5 | 6 | 5 | 1.5 | 0 | 5 |
| Compatibilizing agent | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Comparative example 5
Polystyrene foam without vacuum plastic coating was used as a control for the insulation.
The coating materials prepared in examples 1 to 3 and comparative examples 1 to 4 were subjected to mechanical property test, and the thermal conductivity coefficients of the insulation layers prepared in the different examples and comparative examples were tested, and the results are shown in table 2.
TABLE 2
As can be seen from the data in Table 2, the toughness of the product is affected by the absence of ethylene propylene diene monomer or silane coupling agent, and the product is brittle and not tough due to the improper content of each component in the heat insulation filler, which is not beneficial to the long-term use of the water meter insulation can. In comparative example 4, only glass beads and a silane coupling agent are added as heat insulation materials, so that the heat conductivity coefficient is improved.
The heat-insulating layer without ethylene propylene diene monomer and silane coupling agent is found to be easier to strip after the plastic-sucking coating is tried to strip from the polystyrene foam, and the coating and the polystyrene foam are tightly attached in other embodiments.
Therefore, various heat insulation fillers are required to be matched for use, the addition of ethylene propylene diene monomer rubber and a silane coupling agent is ensured to keep the toughness of the coating layer, and the obtained heat insulation layer has more excellent comprehensive performance.
The water meter boxes prepared by different heat preservation layers are subjected to protection grade test, wherein the protection grades of the embodiments 1-3 all reach IP66, and the water meter boxes prepared by the comparative examples 1-4 only reach IP55 or IP45, the water meter boxes without the heat preservation layers coated by the coating materials in the comparative example 5 only have IP54, and the heat preservation layers are coated by the non-protective films, so that scratches are easily received, and the effect difference is larger.
Claims (5)
1. The heat-insulating water meter box with the low heat conductivity coefficient is characterized by comprising a box cover and a box body which is matched with the box cover in a sealing way through a lock catch, wherein the inner walls of the box cover and the box body are adhered with a heat-insulating layer with low heat conductivity, and the box cover and the box body are respectively formed by adopting SMC composite materials in an injection molding way;
the low-heat-conduction heat-preservation layer comprises polystyrene foam bonded with the inner wall and a coating layer vacuum-molded on the polystyrene foam; the coating layer comprises the following raw materials in parts by weight:
80-100 parts of polystyrene resin;
2-10 parts of ethylene propylene diene monomer rubber;
1-10 parts of heat insulation filler;
5-15 parts of compatilizer;
the heat insulation filler is a mixture of glass beads, nano aluminum silicate and a silane coupling agent;
the mass ratio of the glass beads to the nano aluminum silicate to the silane coupling agent in the heat insulation filler is 0.5-2:0.5-2:2-6;
the heat conductivity coefficient of the low heat conduction heat preservation layer is not higher than 0.035W/(m.K), and the protection grade is above the IP66 grade;
the preparation process of the low-heat-conduction heat-preservation layer comprises the following steps: preparing polystyrene foam matched with the inner wall of the water meter box in size; replacing a mould in a plastic sucking machine with the polystyrene foam, and fixing a coating material above the polystyrene foam by using a clamp; heating a coating material through a heating room on a vacuum plastic sucking machine, then pressing the coating material down to polystyrene foam, vacuumizing air between the coating material and the polystyrene foam by using a vacuum pump, vacuum-sucking the coating material on the outer layer of the polystyrene foam to form a coating layer, and lowering a die table after the coating layer is cooled and shaped to obtain the low-heat-conductivity heat-insulating layer;
the preparation process of the coating material comprises the following steps:
step 1, mixing glass beads, nano aluminum silicate and a silane coupling agent to obtain a heat insulation filler;
and 2, melting, mixing, plasticizing, extruding and casting the polystyrene resin, the ethylene propylene diene monomer rubber, the heat insulation filler and the compatilizer into a thick sheet, and carrying out longitudinal stretching and shaping and transverse stretching and shaping to obtain the coating material.
2. The low thermal conductivity thermal insulation water meter box as claimed in claim 1, wherein the compatilizer is one or more of maleic anhydride, POE-g-GMA, EVA-g-MA;
the case cover or the case body is bonded with polystyrene foam by polyacrylic resin, hot melt adhesive or vinyl polymer;
the sealing part of the box cover and the box body is provided with a rubber sealing layer.
3. The low thermal conductivity thermal insulation water meter box of claim 1, wherein the glass beads have a particle size of 2-10 microns; the grain diameter of the nano aluminum silicate is 5-50nm;
the silane coupling agent is one or more than two of KH-550, KH-560 or KH-570.
4. The low thermal conductivity thermal insulation water meter box according to claim 1, wherein the heating temperature of the coating material is 160-200 ℃, and the heating is 30-60s;
the vacuum degree in the vacuum plastic sucking process is-0.095 to-0.1 Mpa; vacuumizing for 8-15s, and cooling the coating for 20-35s.
5. The low thermal conductivity insulated water meter box of claim 1, wherein in step 2 the melting temperature is 200-250 ℃; the preheating temperature of longitudinal stretching is 75-100 ℃; the preheating temperature of transverse stretching is 100-150 ℃.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201591159U (en) * | 2009-09-28 | 2010-09-29 | 石育祯 | Structure of reflective safety cap |
| CN104098981A (en) * | 2013-04-12 | 2014-10-15 | 南京工业大学 | Preparation method of photochromic heat-insulating functional coating |
| CN104177685A (en) * | 2014-08-19 | 2014-12-03 | 东莞市普凯塑料科技有限公司 | Infrared reflection/emission thermal-insulating plastic functional master batch and preparation method thereof |
| CN207607848U (en) * | 2017-05-10 | 2018-07-13 | 苏州巴鸣泡沫塑料制品有限公司 | A kind of impact resistance plastics piece composite foamed plastic incubator |
| CN108485464A (en) * | 2018-03-29 | 2018-09-04 | 合肥初慕科技有限公司 | The preparation method of anticorrosive coating based on hot environment |
| WO2018215045A1 (en) * | 2017-05-22 | 2018-11-29 | Electrolux Appliances Aktiebolag | Refrigerator appliance having at least one inner plastic liner and method for manufacturing the liner |
| CN110207450A (en) * | 2019-07-04 | 2019-09-06 | 长虹美菱股份有限公司 | A kind of refrigerator lining and preparation method thereof |
-
2022
- 2022-11-14 CN CN202211426264.4A patent/CN115854174B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201591159U (en) * | 2009-09-28 | 2010-09-29 | 石育祯 | Structure of reflective safety cap |
| CN104098981A (en) * | 2013-04-12 | 2014-10-15 | 南京工业大学 | Preparation method of photochromic heat-insulating functional coating |
| CN104177685A (en) * | 2014-08-19 | 2014-12-03 | 东莞市普凯塑料科技有限公司 | Infrared reflection/emission thermal-insulating plastic functional master batch and preparation method thereof |
| CN207607848U (en) * | 2017-05-10 | 2018-07-13 | 苏州巴鸣泡沫塑料制品有限公司 | A kind of impact resistance plastics piece composite foamed plastic incubator |
| WO2018215045A1 (en) * | 2017-05-22 | 2018-11-29 | Electrolux Appliances Aktiebolag | Refrigerator appliance having at least one inner plastic liner and method for manufacturing the liner |
| CN108485464A (en) * | 2018-03-29 | 2018-09-04 | 合肥初慕科技有限公司 | The preparation method of anticorrosive coating based on hot environment |
| CN110207450A (en) * | 2019-07-04 | 2019-09-06 | 长虹美菱股份有限公司 | A kind of refrigerator lining and preparation method thereof |
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