CN113004600A - Cooling tower filler and preparation process thereof - Google Patents

Cooling tower filler and preparation process thereof Download PDF

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CN113004600A
CN113004600A CN202110214498.1A CN202110214498A CN113004600A CN 113004600 A CN113004600 A CN 113004600A CN 202110214498 A CN202110214498 A CN 202110214498A CN 113004600 A CN113004600 A CN 113004600A
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cooling tower
zinc oxide
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micro powder
parts
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CN113004600B (en
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何仁兔
金慧珍
范志远
薛梅
陈杰
詹富强
冯狄
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Zhejiang Jinling Refrigeration Engineering Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F25/00—Component parts of trickle coolers
    • F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
    • F28F25/08—Splashing boards or grids, e.g. for converting liquid sprays into liquid films; Elements or beds for increasing the area of the contact surface
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
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    • C08K2201/005—Additives being defined by their particle size in general
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE

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Abstract

The application relates to the field of refrigeration fillers, and particularly discloses a cooling tower filler and a preparation process thereof. The filler is including being used for making liquid cooling's cooling layer, offers the cellular through-hole that is used for making liquid and air convection contact on the cooling layer, and the filler is made by novel polyethylene plastics, and novel polyethylene plastics mainly are made by the raw materials of following parts by mass: 40-50 parts of high-density polyethylene; 5-8 parts of polybutadiene; 10-15 parts of polyethylene glycol terephthalate; 4-6 parts of modified ceramic micro powder; 3-4 parts of modified zinc oxide; the modified zinc oxide is formed by modifying zinc oxide through a silane coupling agent; the modified ceramic micro powder is formed by modifying ceramic micro powder through a benzophenone ethanol solution. Under a specific modification process, respectively modifying the ceramic micro powder and the zinc oxide, then melting and mixing the raw materials, and finally extruding and molding. The cooling tower plastic filler prepared by the method has better ageing resistance and stronger durability.

Description

Cooling tower filler and preparation process thereof
Technical Field
The application relates to the technical field of refrigeration fillers, in particular to a cooling tower filler and a preparation process thereof.
Background
A cooling tower is a device that uses water as a circulating coolant to absorb heat from a system and discharge the heat to the atmosphere to reduce the temperature of the water. The water and the air are in flowing contact and then are subjected to heat exchange to generate steam, and the steam volatilizes and takes away heat to achieve the effects of evaporation heat dissipation and convection heat transfer. In the cooling tower, the most critical part is the filler of the cooling tower, and the filler has the functions of increasing the heat dissipation capacity, prolonging the retention time of cooling water, increasing the heat exchange area, increasing the heat exchange capacity and uniformly distributing water in the cooling tower.
For example, in a packing module and a cooling tower disclosed in chinese patent application No. CN202010643681.9, an upper flow guide part of an upper triangle having a vertex angle pointing to the upper side of the packing module and an upper longitudinal flow guide part communicating the oblique side of the inflow side of the upper triangle are formed in the vertical direction of the packing module; and a lower flow guide part which is formed into a lower triangle with a vertex angle pointing to the lower part of the packing module in the vertical direction of the packing module and a lower longitudinal flow guide part communicated with the inclined edge of the outflow side of the lower triangle are formed at the lower part of the packing module.
From the viewpoint of cost and general applicability, most of the existing cooling tower fillers are prepared by using plastics, but the common plastics have the problem of easy aging, and the properties of the plastics are reduced, thereby affecting the cooling efficiency.
Disclosure of Invention
In order to improve the durability of the cooling tower plastic filler, the application provides the cooling tower plastic filler and a preparation process thereof.
In a first aspect, the present application provides a cooling tower packing, which adopts the following technical scheme:
the utility model provides a cooling tower packs, is including being used for making the liquid refrigerated cooling layer, offers the cellular through-hole that is used for making liquid and air convection contact on the cooling layer, and the packing is made by novel polyethylene plastics, and novel polyethylene plastics mainly are made by the raw materials of following parts by mass:
40-50 parts of high-density polyethylene;
5-8 parts of polybutadiene;
10-15 parts of polyethylene glycol terephthalate;
4-6 parts of modified ceramic micro powder;
3-4 parts of modified zinc oxide;
the modified zinc oxide is formed by modifying zinc oxide through a silane coupling agent; the modified ceramic micro powder is formed by modifying ceramic micro powder through a benzophenone ethanol solution.
By adopting the technical scheme, the composite plastic is prepared by using the mixed raw materials of the high-density polyethylene, the polybutadiene and the polyethylene glycol terephthalate as main bodies, and the high-density polyethylene has higher molecular weight, so that the composite plastic has higher strength and wear resistance and has extremely high resistance to acid and alkali; polybutadiene contains a large number of carbon-carbon double bonds, which belong to chromophore groups and have larger absorption capacity in an ultraviolet region, so that the aging of plastics caused by the influence of ultraviolet radiation can be reduced; polyethylene terephthalate has good physical and mechanical properties in a wide temperature range, can be used at high temperature for a long time, and has good fatigue resistance. The composite plastic prepared from the three components has better strength, acid and alkali resistance, ultraviolet resistance, high temperature resistance and fatigue resistance, and can be used for a longer time by taking the composite plastic as a cooling tower filler prepared from the raw materials.
The modified ceramic micro powder modified by benzophenone ethanol solution has good ultraviolet resistance and high temperature resistance, and the modified zinc oxide modified by silane coupling agent can further improve the strength and aging resistance of the composite plastic, thereby further improving the durability of the composite plastic.
Preferably, the zinc oxide is tetrapod-like zinc oxide whiskers.
By adopting the technical scheme, because the tetrapod-like zinc oxide whisker has a three-dimensional tetrapod-like three-dimensional structure, compared with common zinc oxide, the tetrapod-like zinc oxide whisker has better dispersibility and can be better combined with long-chain polymers, so that the plastic has better strength and ageing resistance.
Preferably, the ceramic fine powder has a particle size of 1 to 2 μm.
By adopting the technical scheme, the ceramic micro powder with the particle size is used for modification, so that the modified ceramic micro powder with better performance can be obtained and can be better dispersed and combined in the composite plastic.
Preferably, the high density polyethylene has a molecular weight of 70000-90000.
By adopting the technical scheme, the molecular chain length of the high-density polyethylene with the molecular weight can be better matched with polybutadiene and polyethylene terephthalate, so that the prepared composite fiber has better strength.
Preferably, the raw materials of the novel polyethylene also comprise 3.5-4.5 parts by mass of reinforcing fibers, wherein the reinforcing fibers are formed by mixing glass fibers, asbestos fibers and bamboo fibers, and the dosage ratio of the glass fibers, the asbestos fibers and the bamboo fibers is 1 (1.5-2) to 1-1.5.
By adopting the technical scheme, the reinforced fibers are added into the raw materials, so that the strength of the composite plastic is improved, and the toughness of the composite plastic is improved. And because the glass fiber and the asbestos fiber both have good heat resistance, and the bamboo fiber has excellent toughness and ultraviolet resistance, the anti-aging capability of the composite plastic can be further improved.
Preferably, the raw material of the novel polyethylene also comprises 0.5-1 part of rutile type nano titanium dioxide by mass.
By adopting the technical scheme, the rutile type nano titanium dioxide has excellent ultraviolet resistance, so that the rutile type nano titanium dioxide is used as a raw material to be added into the composite plastic, and the anti-aging capability of the plastic can be further improved. And because the rutile type nano titanium dioxide has super-hydrophilicity, a water film can be more easily formed on the surface of the composite plastic, the liquid film forming property of the surface of the prepared cooling tower filler is improved, and water and air flow in a cooling layer can be more fully contacted, so that the cooling effect is improved.
Preferably, the raw material of the novel polyethylene also comprises 0.5-0.8 part of glyceryl monostearate in parts by mass.
By adopting the technical scheme, because the glyceryl monostearate has a good surface activity effect, a hydrophilic layer can be formed on the surface of the composite plastic, and the liquid film forming property of the surface of the prepared cooling tower filler is further improved, so that the cooling tower filler has better cooling capacity.
In a second aspect, the present application provides a process for preparing a cooling tower filler, which adopts the following technical scheme:
the method comprises the following process steps:
s1: adding ceramic micropowder into 20-25% benzophenone ethanol solution, stirring at 50-55 deg.C for 40-50min, filtering, cleaning, and drying to obtain modified ceramic micropowder;
s2: mixing a silane coupling agent with a water-acetone hydrochloric acid solution with the pH value of 4-5 to ensure that the concentration of the silane coupling agent in the mixed solution is 30-35%, adding zinc oxide into the mixed solution, stirring for 30-40min at the temperature of 60-65 ℃, filtering, cleaning and drying, and preserving the temperature of the solid for 5-6h at the temperature of 130-140 ℃ to obtain modified zinc oxide;
s3: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, continuously adding reinforcing fiber, rutile type nano titanium dioxide and glyceryl monostearate after uniformly mixing, and finally extruding and molding through a screw extruder to obtain the finished product of the cooling tower filler.
By adopting the technical scheme, the ceramic micro powder and the zinc oxide are respectively modified in the steps S1 and S2, and under the process conditions, the modified ceramic micro powder with excellent ultraviolet resistance and the modified zinc oxide with excellent strength and ageing resistance can be prepared. In step S3, the cooling tower filler with good aging resistance, high durability and higher strength can be obtained by mixing and melting the raw material components and extruding.
Preferably, in step S1, the ceramic micro powder is subjected to ultrasonic treatment during the stirring process, wherein the frequency of the ultrasonic wave is 10-12kHz, and the ultrasonic power is 180-200W.
By adopting the technical scheme, in the process of modifying the ceramic micro powder, a fine microporous structure can be formed on the surface of the ceramic micro powder through ultrasonic treatment, so that the binding capacity of the benzophenone on the surface of the ceramic micro powder is improved, and the prepared modified ceramic micro powder has better ultraviolet resistance. And the preferred frequency and power during ultrasonic are also given, and the ultrasonic under the parameters is more suitable for the modification conditions of the ceramic micro powder.
In summary, the present application includes at least one of the following beneficial technical effects:
1. this application makes composite plastic through using high density polyethylene, polybutadiene and polyethylene glycol terephthalate to add modified ceramic miropowder and modified zinc oxide in composite plastic, thereby make the cooling tower filler that makes have better intensity, and have better ultraviolet resistance, high temperature resistant, ageing resistance ability, improve its durability.
2. The application provides the optimized crystal form of the zinc oxide in the raw materials, the optimized particle size of the ceramic micro powder and the optimized molecular weight of the high-density polyethylene, so that the prepared composite plastic has better ageing resistance and durability.
3. The reinforced plastic composite material also uses the reinforced fiber formed by mixing the glass fiber, the asbestos fiber and the bamboo fiber in the raw materials, and can improve the strength, the toughness and the anti-aging capability of the prepared composite plastic.
4. According to the application, the rutile type nano titanium dioxide and the glyceryl monostearate are also used in the raw materials, so that the strength and the ageing resistance of the composite plastic are improved, and meanwhile, the surface hydrophilicity of the composite plastic is also improved, so that the prepared cooling tower filler has a better cooling effect.
5. The application also provides a preparation process of the cooling tower filler, and more effective modified ceramic micro powder and modified zinc oxide can be prepared through the preparation process, so that the prepared composite plastic has better durability.
6. When the ceramic micro powder is modified, ultrasonic treatment is adopted, so that benzophenone and the ceramic micro powder are better combined, and the performance of the prepared modified ceramic micro powder is improved.
Detailed Description
Examples
Example 1: a kind of cooling tower filler is provided,
the filler comprises a cooling layer, through holes are formed in the cooling layer, and the through holes are in a hexagonal honeycomb straight pipe shape. The filler is made of a novel polyethylene plastic.
The novel polyethylene plastic comprises the following raw materials: 40kg of high-density polyethylene, 5kg of polybutadiene, 10kg of polyethylene terephthalate, 4kg of modified ceramic micro powder and 3kg of modified zinc oxide. The molecular weight of the used high-density polyethylene is 60000, the modified ceramic micropowder is formed by modifying ceramic micropowder with the particle size of 0.5 mu m through a benzophenone ethanol solution, and the modified zinc oxide is formed by modifying powdered zinc oxide through a silane coupling agent.
The preparation process of the cooling tower filler comprises the following steps:
s1: adding the ceramic micro powder into a benzophenone ethanol solution with the concentration of 20%, stirring for 40min at the temperature of 50 ℃, wherein the stirring speed is 20r/min, filtering under reduced pressure, and then cleaning and drying to obtain modified ceramic micro powder;
s2: mixing a silane coupling agent with a water-acetone hydrochloric acid solution with the pH value of 5 to ensure that the concentration of the silane coupling agent in the mixed solution is 30%, adding zinc oxide into the mixed solution, stirring at the temperature of 60 ℃ for 30min at the stirring speed of 25r/min, filtering, cleaning, drying, and preserving the temperature of the solid at the temperature of 130 ℃ for 5h to obtain modified zinc oxide;
s3: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, uniformly mixing, and extruding and molding by a screw extruder to obtain the finished product of the cooling tower filler.
Example 2: a kind of cooling tower filler is provided,
the difference from example 1 is that the modified ceramic fine powder used was a ceramic fine powder having a particle size of 2.5 μm modified with a benzophenone ethanol solution. The addition amounts of the respective raw materials were different, and the specific addition amounts are shown in table 1 below.
Examples 3 to 4: a kind of cooling tower filler is provided,
the difference from example 1 is that the modified oxidizability is obtained by modifying tetrapod-like zinc oxide whiskers by a silane coupling agent, and the amounts of the components are shown in table 1 below.
Examples 5 to 6: a kind of cooling tower filler is provided,
the difference from example 1 is that the raw material is added with the reinforced fiber, and the reinforced fiber is formed by mixing glass fiber, asbestos fiber and bamboo fiber, and the specific dosage is shown in table 1 below.
Step S3 is changed to: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, mixing uniformly, continuing adding reinforcing fibers, mixing uniformly, and finally extruding and molding through a screw extruder to obtain the finished product of the cooling tower filler.
Examples 7 to 8: a kind of cooling tower filler is provided,
the difference from example 1 is that the rutile type nano titanium dioxide is added into the raw material, and the specific dosage is shown in the following table 1.
Step S3 is changed to: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, mixing uniformly, continuing adding rutile type nano titanium dioxide, mixing uniformly, and finally extruding and molding through a screw extruder to obtain the finished product of the cooling tower filler.
Examples 9 to 10: a kind of cooling tower filler is provided,
the difference from example 1 is that glycerol monostearate was added to the feed in the specific amounts shown in table 1 below.
Step S3 is changed to: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, mixing uniformly, continuing adding glyceryl monostearate, mixing uniformly, and finally extruding and molding through a screw extruder to obtain the finished product of the cooling tower filler.
Example 11: a kind of cooling tower filler is provided,
the difference from the example 1 is that the raw materials are added with the reinforced fiber, the rutile type nanometer titanium dioxide and the glycerin monostearate, the reinforced fiber is formed by mixing glass fiber, asbestos fiber and bamboo fiber, and the specific dosage of each component is changed as shown in the following table 1 in the step S3: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, continuously adding reinforcing fiber, rutile type nano titanium dioxide and glyceryl monostearate after uniformly mixing, and finally extruding and molding through a screw extruder to obtain the finished product of the cooling tower filler.
Example 12: a kind of cooling tower filler is provided,
the difference from example 1 is that the high-density polyethylene used has a molecular weight of 70000. The amounts of the components used are shown in table 1 below.
Example 13: a kind of cooling tower filler is provided,
the difference from example 1 is that the high density polyethylene used has a molecular weight of 90000. The amounts of the components used are shown in table 1 below.
Example 14: a kind of cooling tower filler is provided,
the difference from example 1 is that the modified ceramic fine powder was obtained by modifying a ceramic fine powder having a particle size of 1 μm with a benzophenone ethanol solution. The amounts of the components used are shown in table 1 below.
Example 15: a kind of cooling tower filler is provided,
the difference from example 1 is that the modified ceramic fine powder was obtained by modifying a ceramic fine powder having a particle size of 2 μm with a benzophenone ethanol solution. The amounts of the components used are shown in table 1 below.
Example 16: a kind of cooling tower filler is provided,
the difference from example 1 is that in step S1, an ultrasonic rod is inserted into the benzophenone ethanol solution during stirring, and the ceramic fine powder is subjected to ultrasonic treatment by the ultrasonic rod, the frequency of the ultrasonic wave is 11kHz, and the ultrasonic power is 190W.
Table 1: EXAMPLES 1-16 Components and amounts (kg)
Figure BDA0002952639720000061
Figure BDA0002952639720000071
Comparative example
Comparative example 1: the packing for the cooling tower comprises a cooling layer, wherein through holes are formed in the cooling layer, and the through holes are in a hexagonal honeycomb straight pipe shape. The filler was made of high density polyethylene with an average molecular weight of 60000. The amounts of high density polyethylene used are shown in table 2 below.
The preparation steps are as follows: and heating the high-density polyethylene to be molten, and then extruding and molding the high-density polyethylene by a screw extruder to obtain the finished product of the cooling tower filler.
Comparative example 2: a kind of cooling tower filler is provided,
the difference from example 1 is that the starting material does not contain polybutadiene and the amounts of the remaining components are shown in Table 2 below.
Step S3 is changed to: mixing high-density polyethylene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, uniformly mixing, and extruding and molding by a screw extruder to obtain the finished product of the cooling tower filler.
Comparative example 3: a kind of cooling tower filler is provided,
the difference from example 1 is that the raw material does not contain polyethylene terephthalate, and the amounts of the remaining components are shown in the following table 2.
Step S3 is changed to: mixing high-density polyethylene and polybutadiene, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, uniformly mixing, and extruding and molding by a screw extruder to obtain the finished product of the cooling tower filler.
Comparative example 4: a kind of cooling tower filler is provided,
the difference from example 1 is that the raw material does not contain the modified ceramic fine powder, and the amounts of the other components are shown in table 2 below.
The process steps are changed as follows:
s1: mixing a silane coupling agent with a water-acetone hydrochloric acid solution with the pH value of 5 to ensure that the concentration of the silane coupling agent in the mixed solution is 30%, adding zinc oxide into the mixed solution, stirring at the temperature of 60 ℃ for 30min at the stirring speed of 25r/min, filtering, cleaning, drying, and preserving the temperature of the solid at the temperature of 130 ℃ for 5h to obtain modified zinc oxide;
s2: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified zinc oxide into the molten mixture, uniformly mixing, and extruding and molding by a screw extruder to obtain the finished product of the cooling tower filler.
Comparative example 5: the difference from example 1 is that the raw material does not contain modified zinc oxide, and the amounts of the other components are shown in table 2 below.
The process steps are changed as follows:
s1: adding the ceramic micro powder into a benzophenone ethanol solution with the concentration of 20%, stirring for 40min at the temperature of 50 ℃, wherein the stirring speed is 20r/min, filtering under reduced pressure, and then cleaning and drying to obtain modified ceramic micro powder;
s2: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder into the molten mixture, uniformly mixing, and extruding and molding by a screw extruder to obtain the finished product of the cooling tower filler.
Table 2: COMPARATIVE EXAMPLES 1-5 Components AND amounts (kg)
Figure BDA0002952639720000081
Performance test tests were conducted mainly around both heat aging and ultraviolet aging, since aging of plastics is only reflected in both of these aspects.
Test one: test principle of thermal aging contrast test: and measuring the impact strength of the plastic samples before and after thermal aging by taking the impact strength of the plastic as the standard performance for judging aging, and comparing the aging resistance of each group of samples by comparing the change rate of the impact strength of each group of samples before and after aging.
Test subjects: plastic specimens having a thickness of 4mm and a width of 10mm were prepared using the plastic preparation processes of examples 1 to 16 and comparative examples 1 to 5, respectively, and numbered in this order as test specimens 1 to 16 and control specimens 1 to 5.
Test equipment: BLD-X701 ventilated thermal ageing test chamber, (Tianshi Kuai force) plastic pendulum impact tester.
The test steps are as follows:
1. initial impact strength measurement: 5 test pieces having a length of 80mm were taken out from the test samples 1 to 16 and the control samples 1 to 5, respectively, and the impact energy absorption at break of each test piece was measured using a plastic pendulum impact testerE (J), and calculating the impact strength a (kJ/m)2)；
Figure BDA0002952639720000082
In the formula:
e-the impact energy absorption in joules (J);
h-specimen thickness in millimeters (mm); h is 4 in the test;
b-specimen width in millimeters (mm); b is 10 in the test;
finally, the average initial impact strength a of each test sample and the control sample is calculated1(kJ/m2) Two decimal places were retained, and the experimental results are shown in table 3 below.
2. And (3) aging of the plastic: then 5 samples with the length of 80mm are taken out from the test samples 1-16 and the comparison samples 1-5 respectively, and the samples are aged in an air exchange type heat aging test box, wherein the aging temperature is 90 ℃ and the aging time is 120 h.
3. Measurement of impact strength after aging: the same method as in step 1 was used to measure the impact energy of each sample after aging in step 2, and the average impact strength a after aging was calculated by the same method2(kJ/m2) Two decimal places were retained, and the experimental results are shown in table 3 below.
4. Calculating the reduction rate X of the impact strength before and after thermal aging1，X1＝(a1-a2)÷a1X 100%, two decimal places were retained for the results, and the results are shown in table 3 below.
Table 3: test data recording sheet
Figure BDA0002952639720000091
And (2) test II: ultraviolet aging contrast test principle: the principle is the same as that of the test, ultraviolet aging is adopted in the test, and the anti-aging performance of each group of samples can be compared by comparing the change rate of the impact strength of each group of samples before and after aging.
Test subjects: using the plastic manufacturing processes of examples 1-16 and comparative examples 1-5, respectively, plastic specimens having a thickness of 4mm and a width of 10mm were prepared and numbered in the order of test specimens 1-16 and control specimens 1-5 (using specimens prepared in test one).
Test equipment: SN-500L xenon lamp aging box, (Tian Shi Ku force) plastic pendulum impact tester.
The test steps are as follows:
1. initial impact strength measurement: since the same test piece as in test one was used, the average initial impact strength a measured in test one was used directly1As data for this experiment.
2. According to the test method of national standard GB/T16422.3-2014 of the people's republic of China, 5 samples with the length of 80mm are taken out from the test samples 1-16 and the control samples 1-5 respectively, each sample is subjected to ultraviolet aging in a xenon lamp aging oven, exposure circulation is carried out by using the method A provided in GB/T16422.3-2014, and the circulation coefficient is three times.
3. Measurement of aged impact strength: the average post-aging impact strength a was measured and calculated by the same method as in test one3(kJ/m2) Two decimal places were retained, and the experimental results are shown in table 4 below.
4. Calculating the reduction rate X of the impact strength before and after ultraviolet aging2，X2＝(a1-a3)÷a1X 100%, two decimal places were retained for the results, and the results are shown in table 4 below.
Table 4: test two data recording table
Figure BDA0002952639720000101
The following analysis is now performed in conjunction with the data from test one and test two:
comparing the data of the test samples 1-2 and the control sample 1 in tables 3 and 4, X of the test samples 1-2 can be found1And X2The values are all much smaller than test 1. This indicates that the test samples 1 to 2 are more resistant to heat aging and UV aging than the control sample 1. Thus illustrating the durability of the cooling tower packing made of the novel plastic of examples 1-2Is stronger than common polyethylene plastics. This is because example 1-2 uses polybutadiene and polyethylene terephthalate having ultraviolet resistance and heat resistance to produce a composite plastic having higher durability, and further, the plastic is added with modified zinc oxide modified with a silane coupling agent and modified ceramic fine powder modified with an ethanol solution of benzophenone to further improve the ultraviolet resistance and heat resistance of the plastic. And also found a of test samples 1 to 21、a2And a3The values are all greater than control 1, which demonstrates that the cooling tower packing made from examples 1-2 is stronger on a base than conventional plastic.
Comparing the data of the test samples 1-2 and the control sample 2 in tables 3 and 4, X of the test samples 1-2 and the control sample 2 can be found1Values are comparable, but X for test samples 1-22The value was significantly less than control 2. This can indicate that although polybutadiene does not provide much improvement in heat resistance, polybutadiene has a significant contribution in improving ultraviolet resistance.
Comparing the data of the test samples 1-2 and the control sample 3 in tables 3 and 4, X of the test samples 1-2 can be found1And X2The values are all less than that of control 3, which shows that the polyethylene terephthalate has an effect of improving the composite plastic in terms of heat resistance and ultraviolet resistance.
Comparing the data of the test samples 1-2 and the control samples 4-5 in tables 3 and 4, X of the test samples 1-2 can be found1And X2The values are all less than 4-5 of the comparison sample, which shows that the modified ceramic micro powder and the modified zinc oxide have the improvement effect on the composite plastic in the aspects of heat resistance and ultraviolet resistance.
Comparing the data of test samples 1-2 and test samples 3-4 in tables 3 and 4, X of test samples 3-4 can be found1And X2All values are less than test samples 1-2. This is because the tetrapod-like zinc oxide whiskers used for modification in examples 3 to 4 have better dispersibility than ordinary zinc oxide and can be bonded to long-chain polymers better, thereby imparting better aging resistance to plastics.
Comparing the data of test samples 1-2 and test samples 5-6 in tables 3 and 4, X for test samples 5-6 can be found1And X2All values are less than test samples 1-2. This is because the reinforced fibers obtained by mixing the glass fibers, the asbestos fibers and the bamboo fibers were used in examples 5 to 6, and the glass fibers and the asbestos fibers had good heat resistance, while the bamboo fibers had excellent toughness and ultraviolet resistance, and thus the aging resistance of the composite plastic was further improved. And further comparison shows that a of test samples 5 to 61、a2And a3The values are all larger than the test samples 1-2, which shows that the strength of the plastic can be improved while the ageing resistance of the plastic is improved by adding the reinforcing fiber.
Comparing the data of test samples 1-2 and 7-8 in tables 3 and 4, X for test samples 7-8 can be found1And X2All values are less than test samples 1-2. This is because the rutile type nano titanium dioxide having excellent ultraviolet resistance was used in examples 7 to 8, and thus the aging resistance of the plastic was further improved by adding the rutile type nano titanium dioxide as a raw material to the composite plastic.
Comparing the data of test samples 1-2 and test sample 11 in tables 3 and 4, X of test sample 11 can be found1And X2The values are all significantly less than the test samples 1-2. And further comparing test samples 3 to 10, X for test sample 11 can be found1And X2The value is the lowest value, and thus example 11 can be illustrated as the optimal solution. In combination with the above analysis, it can be further demonstrated that the addition of reinforcing fibers and rutile type nano titanium dioxide can produce a better effect of mutual coordination by using tetrapod-like zinc oxide whiskers simultaneously.
Comparing the data of test samples 1-2 and test samples 12-13 in tables 3 and 4, X for test samples 12-13 can be found1And X2All values are less than test samples 1-2. This demonstrates the superior molecular weight of the high density polyethylenes used in examples 12-13. Within the molecular weight range, the molecular chain of the polyethylene can form better matching with the polybutadiene and the polyethylene terephthalate, and the aging resistance of the prepared novel plastic can be improved.
Comparing the data of test samples 1-2 and test samples 14-15 in tables 3 and 4, X for test samples 14-15 can be found1And X2All values are less than test samples 1-2. This indicates that the particle size of the ceramic fine powder used in examples 12 to 13 is better, and in this particle size range, the ceramic fine powder can be better modified with dipropyl ketone, and the ceramic fine powder and the chain polymer in the plastic can be better combined, so that the prepared plastic has better aging resistance.
Comparing the data of test samples 1-2 and test sample 16 in tables 3 and 4, X for test sample 16 can be found1And X2All values are less than test samples 1-2. The reason is that a fine microporous structure can be formed on the surface of the ceramic micro powder through ultrasonic treatment, so that the binding capacity of the benzophenone on the surface of the ceramic micro powder is improved, and the prepared modified ceramic micro powder has better ultraviolet resistance.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (9)

1. The utility model provides a cooling tower packs, is including being used for making the liquid refrigerated cooling layer, offers the cellular through-hole that is used for making liquid and air convection contact on the cooling layer, its characterized in that: the filler is made of novel polyethylene plastic, and the novel polyethylene plastic is mainly made of the following raw materials in parts by mass:
40-50 parts of high-density polyethylene;
5-8 parts of polybutadiene;
10-15 parts of polyethylene glycol terephthalate;
4-6 parts of modified ceramic micro powder;
3-4 parts of modified zinc oxide;
the modified zinc oxide is formed by modifying zinc oxide through a silane coupling agent; the modified ceramic micro powder is formed by modifying ceramic micro powder through a benzophenone ethanol solution.
2. A cooling tower fill material according to claim 1, wherein: the zinc oxide is tetrapod-like zinc oxide whisker.
3. A cooling tower fill material according to claim 1, wherein: the grain size of the ceramic micro powder is 1-2 μm.
4. A cooling tower fill material according to claim 1, wherein: the molecular weight of the high-density polyethylene is 70000-90000.
5. A cooling tower fill material according to claim 1, wherein: the novel polyethylene also comprises 3.5-4.5 parts by weight of reinforcing fiber, wherein the reinforcing fiber is formed by mixing glass fiber, asbestos fiber and bamboo fiber, and the dosage ratio of the glass fiber to the asbestos fiber to the bamboo fiber is 1 (1.5-2) to 1-1.5.
6. A cooling tower fill material according to claim 1, wherein: the novel polyethylene raw material also comprises 0.5-1 part of rutile type nano titanium dioxide by mass.
7. A cooling tower fill material according to claim 1, wherein: the novel polyethylene raw material also comprises 0.5-0.8 part of glycerin monostearate by mass.
8. A process for the preparation of a cooling tower packing material according to any one of claims 1 to 7, wherein: the method comprises the following process steps:
s1: adding ceramic micropowder into 20-25% benzophenone ethanol solution, stirring at 50-55 deg.C for 40-50min, filtering, cleaning, and drying to obtain modified ceramic micropowder;
s2: mixing a silane coupling agent with a water-acetone hydrochloric acid solution with the pH value of 4-5 to ensure that the concentration of the silane coupling agent in the mixed solution is 30-35%, adding zinc oxide into the mixed solution, stirring for 30-40min at the temperature of 60-65 ℃, filtering, cleaning and drying, and preserving the temperature of the solid for 5-6h at the temperature of 130-140 ℃ to obtain modified zinc oxide;
s3: mixing high-density polyethylene, polybutadiene and polyethylene glycol terephthalate, heating to melt, adding modified ceramic micro powder and modified zinc oxide into the molten mixture, continuously adding reinforcing fiber, rutile type nano titanium dioxide and glyceryl monostearate after uniformly mixing, and finally extruding and molding through a screw extruder to obtain the finished product of the cooling tower filler.
9. The process for preparing a cooling tower packing material according to claim 8, wherein: in the step S1, the ceramic micro powder is subjected to ultrasonic treatment in the stirring process, wherein the frequency of the ultrasonic wave is 10-12kHz, and the ultrasonic power is 180-200W.
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