CN110028725A - A kind of preparation method of high-strength durable floor heating pipe - Google Patents
A kind of preparation method of high-strength durable floor heating pipe Download PDFInfo
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- CN110028725A CN110028725A CN201910361226.7A CN201910361226A CN110028725A CN 110028725 A CN110028725 A CN 110028725A CN 201910361226 A CN201910361226 A CN 201910361226A CN 110028725 A CN110028725 A CN 110028725A
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- floor heating
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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
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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
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention belongs to novel building building materials preparation technical fields, and in particular to a kind of preparation method of high-strength durable floor heating pipe.Graphite is put into sulfuric acid be mixed first by the present invention, potassium permanganate reaction is added after stirring, oxidation slurries are made, finally heat-treated products are mixed with polyethylene, azodicarbonamide and other auxiliary agents, high temperature, which squeezes out, is made high-strength durable floor heating pipe, it is scattered in floor heating pipe using graphene molecules, be conducive to reinforce the chemical stability of floor heating pipe, the endurance quality of floor heating pipe is set to be strengthened, graphene itself has good heating conduction simultaneously, in conjunction with the chemical stability of graphene itself, the heat resistance of floor heating pipe is improved again；The present invention makes to be difficult to fouling in floor heating pipe, while enhancing the heat transfer efficiency of floor heating pipe, have broad application prospects using the combination degree that each ingredient in plant fiber bonding heater adsorption floor heating pipe improves each ingredient in floor heating pipe to improve the smoothness of floor heating tube wall.
Description
Technical field
The invention belongs to novel building building materials preparation technical fields, and in particular to a kind of preparation of high-strength durable floor heating pipe
Method.
Background technique
When cold winter arrives, " thermal insulation " increasingly becomes the hot topic that people talk about.Floor heating full name is floor
Radiant heating is a kind of accumulation of heat based on ground, heat transfer technology.Floor heating pipe is mainly formed by plastic processing, and floor heating pipe is embedded in ground
Under, have high requirements to the stability of pipeline, load performance, rigidity, intensity.Meanwhile some plastic conduit outer surfaces is scratch-resistant, resistance to
Mill property is poor, it is easy to occur as soon as slight crack.Floor heating pipe is embedded in building building cement, and repair and replacement are extremely difficult, when there is product quality
Problem will cause serious property safety accident.Therefore, national standard is very high to the performance requirement of floor heating pipe, to ensure its peace
It entirely uses.
The raw material of PERT floor heating pipe is exactly a kind of medium density polyethylene that mechanical property is sufficiently stable, by ethylene and octene
Monomer is formed through catalyzed copolymerization.It is not necessarily to be crosslinked in the process of production and processing, and simple production process is easy to control, pipe workpiece quality
The characteristics such as reliable and stable: PERT ground heating pipes are that currently the only one kind is not required to be crosslinked, and can be in 60 degree of water temperature or less long-term hydrostatics
Press the plastic pipe of performance.Under the conditions of it is 0.8MPa that operating temperature, which is > 60 DEG C of pressure, service life can be used safely 50 years
Left and right.
Polyethylene is typical thermoplastic, since PE tubing is with nontoxic, tasteless, odorless, good cold-resistant, heat-resisting
Property and chemical stability, higher rigidity and toughness and good mechanical property, it is easy for installation many advantages, such as, widely answered
It gives, drain, the fields such as buried drain pipe, appendix and telecommunications engineering for building.Common polyvinyl piping materials are as floor heating pipe
In use, it is scratch-resistant, wear no resistance, it is easy to occur as soon as slight crack, it is therefore desirable to improve to floor heating pipe.
PERT floor heating dedicated pipe: PERT pipe is laid under floor, and the hot water using temperature not higher than 60 DEG C is being heated as heating agent
Pipe internal circulation flow heating floor brings up a kind of interior for meeting human comfort's requirement to realize the radiant heat transfer of large area
Environment is the heating pipeline system of Modern New.
It is born from floor heating and shares following use of several tubing as floor heating pipe till now.It is PE-X respectively: crosslinking
Polyethylene 1, PAP: aluminum plastic composite pipe 2, PP-B: impact resistance copolymer polypropylene (South Korea is once referred to as PP-C), PP-R: random total
Poly- polypropylene, PB: polybutene high temperature resistant, PE-RT: polyethylene.
For PE-RT tubing because flexibility is good, intensity is high, and impact resistance is strong and heat resistance is good, has become ground heating at present
Preferred material.The coefficient of heat conduction of PE-RT is 0.4w/m.K, but compared with metal tube, heat transfer efficiency or very low；Pipe
Wall fouling more reduces the thermal efficiency, and one millimeter of every fouling, being equivalent to water temperature reduces by 6 degree, seriously reduces the thermal efficiency, influences room temperature,
Comfort level is very poor.PE-RT pipe is preferred as the mode of ground heating, improves thermal coefficient, and it is a critically important for reducing scaling degree
Project, with country about energy-saving and emission-reduction, the development policies general orientation of low-carbon environment-friendly is closely related.
Heat-proof polythene (PE-RT) ground heating pipes are due to easy for installation, the advantages that chemical corrosion resistance is strong, and flexibility is good,
It being widely used in fields such as town building heating engineering, rural area heating system reforms, it is mounted under floor ground cement,
It is invisible in entire space, space is not only saved, but also relatively beautiful, the deep welcome by numerous users, but it is such at present
Plastic conduit haves the shortcomings that very big, that is, for polyethylene as high molecular material, its thermal conductivity is lower compared with metal, heat dissipation
It is relatively slow.
Floor heating pipe exists at present: the problems such as heat transfer efficiency is low, heat-resisting endurance quality is poor, tube wall easy fouling.
Therefore, inventing the excellent ground heating pipes of one kind has positive effect to novel building building materials preparation technical field.
Summary of the invention
The technical problems to be solved by the invention: low for current floor heating pipe heat transfer efficiency, heat-resisting endurance quality is poor, tube wall
The defect of easy fouling, provides a kind of preparation method of high-strength durable floor heating pipe.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of preparation method of high-strength durable floor heating pipe, it is characterised in that specific preparation step are as follows:
Heat-treated products, polyethylene, azodicarbonamide, titanate coupling agent are put into blender, are 80~85 in temperature
It is stirred 30~40min under conditions of DEG C and obtains blend composition, blend composition is put into double screw extruder, is in extrusion temperature
Extrusion molding is under conditions of 220~230 DEG C up to high-strength durable floor heating pipe；
The specific preparation step of the heat-treated products are as follows:
(1) mixed material, starch, methane liquid, sodium citrate and water are putted into fermenter, is by fermentor temperature disposed within
In 32~36 DEG C of greenhouse, constant temperature stands 3~5 days, and filter cake is obtained by filtration after standing, is made with washes of absolute alcohol filter cake 3~5 times
Obtain tunning；
(2) tunning is put into tube furnace, nitrogen will be filled in tube furnace, nitrogen is passed through with the rate of 40~50mL/min
Tubular type in-furnace temperature is increased to 110~120 DEG C by gas, and constant temperature preheats 50~60min, and tubular type in-furnace temperature is increased again, permanent
Heat-treated products are made in 2~3h of temperature calcining, by heat-treated products；
The specific preparation step of the mixed material are as follows:
(1) sulfuric acid solution that flaky graphite and mass fraction are 15~20% is put into beaker, with agitating device with 300~
20~30min is mixed in the revolving speed of 350r/min, and mixed serum is made, potassium permanganate powder is added into beaker, by beaker
It is placed in the water-bath that bath temperature is 30~35 DEG C, constant temperature stands 50~60 DEG C and oxidation slurries are made；
(2) hydrogen peroxide that slurries and mass fraction are 12~15% will be aoxidized to put into three-necked flask, with agitating device with 500~
The revolving speed of 550r/min stirs 40~50min and dispersion liquid is made, and the secondary chlorine that mass fraction is 12~15% is added into three-necked flask
Acid sodium solution continues to be stirred 30~40min with the revolving speed of 500~550r/min with blender and be made to react lotion；
(3) reaction lotion is poured into filter in suction filtration machine and obtains filter cake, clean filter with the ethanol solution that mass fraction is 30~40%
Modified-reaction solid and agricultural crop straw are in 1:5 investment pulverizer to get modified-reaction solid by cake 3~5 times in mass ratio
It crushes, is put into baking oven after crushing, mixed material is made in dry 2~3h under conditions of temperature is 70~80 DEG C.
Preferably according to parts by weight, the heat-treated products are 10~12 parts, polyethylene is 82~86 parts, azo two
Formamide is 1.5~2.0 parts, titanate coupling agent is 0.6~1.0 part.
In the specific preparation step (1) of heat-treated products preferably according to parts by weight, the mixed material is 8~10
Part, starch are 1~2 part, methane liquid is 3~4 parts, sodium citrate is 0.6~1.0 part, water is 7~9 parts.
Temperature in tube furnace described in the specific preparation step (2) of heat-treated products when calcining at constant temperature is 350~400
℃。
The sulfuric acid that flaky graphite described in the specific preparation step (1) of mixed material and mass fraction are 15~20%
The mass ratio of solution is 1:10.
The quality for the potassium permanganate powder being added described in the specific preparation step (1) of mixed material into beaker is mixed
Close the 5~7% of grind slurries quality.
The hydrogen peroxide that oxidation slurries described in the specific preparation step (2) of mixed material and mass fraction are 12~15%
Mass ratio be 10:1.
The mass fraction being added described in the specific preparation step (2) of mixed material into three-necked flask is 12~15%
Liquor natrii hypochloritis quality be dispersion liquid quality 20~25%.
The mass ratio of modified-reaction solid described in the specific preparation step (3) of mixed material and agricultural crop straw is 1:
5。
The method have the benefit that:
(1) graphite is put into sulfuric acid be mixed first by the present invention, potassium permanganate reaction is added after stirring, oxidation slurries are made,
Hydrogen peroxide is successively added into oxidation slurries again and reaction lotion is made in liquor natrii hypochloritis's reaction, then filters reaction lotion
Filter cake is obtained, with agricultural crop straw co-grinding after cleaning, microbial fermentation is carried out and tunning is made, then by tunning
It carries out high-temperature process and heat-treated products is made, finally by heat-treated products and polyethylene, azodicarbonamide and other auxiliary agents
Mixing, high temperature, which squeezes out, is made high-strength durable floor heating pipe, and graphite is reacted under conditions of sulfuric acid with potassium permanganate, made by the present invention
Graphite is oxidized generation graphene oxide composite material, adds hydrogen peroxide and sodium hypochlorite reaction generates graphene molecules, utilize stone
Black alkene molecule is scattered in floor heating pipe, and the molecular structure of graphene molecules is firm, and chemical property is stablized, and is conducive to improve floor heating pipe
Structural strength itself and chemical stability obtain the endurance quality of floor heating pipe to reinforce the chemical stability of floor heating pipe
Reinforce, while graphene itself has good heating conduction, is scattered in the thermal conductivity for being conducive to reinforce floor heating pipe in floor heating pipe
Can, in conjunction with the chemical stability of graphene itself, the heat resistance of floor heating pipe is improved again；
(2) agricultural crop straw is carried out microbial fermentation by the present invention, separates the ingredients such as the plant fiber in stalk, and fermenting
Decompose agronomic crop fibre in the process, the fracture of organic fiber chain generates the shorter fiber molecule of strand, and plant fiber bonds stone
Black alkene molecule improves the mechanical strength of plant fiber, improves floor heating using each ingredient in plant fiber bonding heater adsorption floor heating pipe
The combination degree of each ingredient in pipe enhances the compactness of floor heating pipe surface to make the molecular structure enhanced strength of floor heating pipe,
To improve the smoothness of floor heating tube wall, make to be difficult to fouling in floor heating pipe, while the raising of structural strength makes graphene molecules
Between spacing shorten, be more advantageous to heat transfer, to enhance the heat transfer efficiency of floor heating pipe, have broad application prospects.
Specific embodiment
It is in mass ratio to be used in 1:10 investment beaker by the sulfuric acid solution that flaky graphite and mass fraction are 15~20%
20~30min is mixed with the revolving speed of 300~350r/min in agitating device, and mixed serum is made, and mixing is added into beaker
The potassium permanganate powder of grind slurries quality 5~7% places the beaker in the water-bath that bath temperature is 30~35 DEG C, and constant temperature stands 50
~60 DEG C are made oxidation slurries；It is in mass ratio that 10:1 is thrown by the hydrogen peroxide that above-mentioned oxidation slurries and mass fraction are 12~15%
Enter in three-necked flask, 40~50min is stirred with the revolving speed of 500~550r/min with agitating device, dispersion liquid is made, burnt to three mouthfuls
The liquor natrii hypochloritis that the mass fraction of dispersion liquid quality 20~25% is 12~15% is added in bottle, continues with blender with 500
The revolving speed of~550r/min stirs 30~40min and reaction lotion is made；Above-mentioned reaction lotion is poured into filter in suction filtration machine and is obtained
Filter cake cleans filter cake 3~5 times to get modified-reaction solid, by modified-reaction with the ethanol solution that mass fraction is 30~40%
Solid is to crush in 1:5 investment pulverizer with agricultural crop straw in mass ratio, is put into baking oven after crushing, is 70~80 in temperature
Mixed material is made in dry 2~3h under conditions of DEG C；According to parts by weight, by 8~10 parts of mixed materials, 1~2 part of starch, 3~
4 parts of methane liquids, 0.6~1.0 part of sodium citrate and 7~9 parts of water put into fermenter, by fermentor temperature disposed within be 32~
In 36 DEG C of greenhouse, constant temperature stands 3~5 days, and filter cake is obtained by filtration after standing, and hair is made with washes of absolute alcohol filter cake 3~5 times
Ferment product；Above-mentioned tunning is put into tube furnace, nitrogen will be filled in tube furnace, be passed through with the rate of 40~50mL/min
Tubular type in-furnace temperature is increased to 110~120 DEG C by nitrogen, and constant temperature preheats 50~60min, and tubular type in-furnace temperature is increased again
To 350~400 DEG C, heat-treated products are made in 2~3h of calcining at constant temperature, by heat-treated products；According to parts by weight, by 10~12 parts
Above-mentioned heat-treated products, 82~86 parts of polyethylene, 1.5~2.0 parts of azodicarbonamides, 0.6~1.0 part of titanate coupling agent are thrown
Enter in blender, be stirred 30~40min under conditions of temperature is 80~85 DEG C and obtain blend composition, blend composition is put into double
In screw extruder, extrusion molding is under conditions of extrusion temperature is 220~230 DEG C up to high-strength durable floor heating pipe.
It aoxidizes the preparation of slurries: being in mass ratio that 1:10 is thrown by the sulfuric acid solution that flaky graphite and mass fraction are 15%
Enter in beaker, 20min is mixed with the revolving speed of 300r/min with agitating device, mixed serum is made, is added into beaker mixed
The potassium permanganate powder for closing grind slurries quality 5% places the beaker in the water-bath that bath temperature is 30 DEG C, and constant temperature stands 50 DEG C of systems
Slurries must be aoxidized；
React the preparation of lotion:
It is in mass ratio in 10:1 investment three-necked flask, with stirring by the hydrogen peroxide that above-mentioned oxidation slurries and mass fraction are 12%
Dispersion liquid is made with the revolving speed stirring 40min of 500r/min in device, and the quality point of dispersion liquid quality 20% is added into three-necked flask
The liquor natrii hypochloritis that number is 12% continues that reaction lotion is made with the revolving speed stirring 30min of 500r/min with blender；
The preparation of mixed material:
Above-mentioned reaction lotion is poured into filter in suction filtration machine and obtains filter cake, cleans filter cake 3 with the ethanol solution that mass fraction is 30%
Secondary be to crush in 1:5 investment pulverizer with agricultural crop straw by modified-reaction solid to get modified-reaction solid in mass ratio,
It is put into baking oven after crushing, mixed material is made in dry 2h under conditions of temperature is 70 DEG C；
The preparation of tunning:
According to parts by weight, by 8 parts of mixed materials, 1 part of starch, 3 parts of methane liquids, 0.6 part of sodium citrate and 7 parts of water investment fermentations
In tank, in the greenhouse for being 32 DEG C by fermentor temperature disposed within, constant temperature stands 3 days, filter cake is obtained by filtration after standing, use is anhydrous
Ethyl alcohol cleans 3 obtained tunnings of filter cake；
The preparation of heat-treated products:
Above-mentioned tunning is put into tube furnace, nitrogen will be filled in tube furnace, nitrogen is passed through with the rate of 40mL/min, it will
Tubular type in-furnace temperature is increased to 110 DEG C, and constant temperature preheats 50min, tubular type in-furnace temperature is again raised to 350 DEG C, calcining at constant temperature
Heat-treated products are made in 2h, by heat-treated products；
The preparation of high-strength durable floor heating pipe:
According to parts by weight, by 10 parts of above-mentioned heat-treated products, 82 parts of polyethylene, 1.5 parts of azodicarbonamides, 0.6 part of metatitanic acid
Ester coupling agent is put into blender, is stirred 30min under conditions of temperature is 80 DEG C and is obtained blend composition, blend composition is put into
In double screw extruder, extrusion molding is under conditions of extrusion temperature is 220 DEG C up to high-strength durable floor heating pipe.
It aoxidizes the preparation of slurries: being in mass ratio 1:10 by the sulfuric acid solution that flaky graphite and mass fraction are 17.5%
It puts into beaker, 25min is mixed with the revolving speed of 325r/min with agitating device, mixed serum is made, is added into beaker
The potassium permanganate powder of mixed serum quality 6% places the beaker in the water-bath that bath temperature is 32.5 DEG C, and constant temperature stands 55
DEG C be made oxidation slurries；
React the preparation of lotion:
It is in mass ratio in 10:1 investment three-necked flask by the hydrogen peroxide that above-mentioned oxidation slurries and mass fraction are 13.5%, with stirring
It mixes device and dispersion liquid is made with the revolving speed stirring 45min of 525r/min, the matter of dispersion liquid quality 22.5% is added into three-necked flask
The liquor natrii hypochloritis that score is 13.5% is measured, continues that reaction cream is made with the revolving speed stirring 35min of 525r/min with blender
Liquid；
The preparation of mixed material:
Above-mentioned reaction lotion is poured into filter in suction filtration machine and obtains filter cake, cleans filter cake 4 with the ethanol solution that mass fraction is 35%
Secondary be to crush in 1:5 investment pulverizer with agricultural crop straw by modified-reaction solid to get modified-reaction solid in mass ratio,
It is put into baking oven after crushing, mixed material is made in dry 2.5h under conditions of temperature is 75 DEG C；
The preparation of tunning:
According to parts by weight, by 9 parts of mixed materials, 1.5 parts of starch, 3.5 parts of methane liquids, 0.8 part of sodium citrate and 8 parts of water investments
In fermentor, in the greenhouse for being 34 DEG C by fermentor temperature disposed within, constant temperature stands 4 days, and filter cake is obtained by filtration after standing, uses
4 obtained tunnings of washes of absolute alcohol filter cake；
The preparation of heat-treated products:
Above-mentioned tunning is put into tube furnace, nitrogen will be filled in tube furnace, nitrogen is passed through with the rate of 45mL/min, it will
Tubular type in-furnace temperature is increased to 115 DEG C, and constant temperature preheats 55min, tubular type in-furnace temperature is again raised to 375 DEG C, calcining at constant temperature
Heat-treated products are made in 2.5h, by heat-treated products；
The preparation of high-strength durable floor heating pipe:
According to parts by weight, by 11 parts of above-mentioned heat-treated products, 84 parts of polyethylene, 1.75 parts of azodicarbonamides, 0.8 part of metatitanic acid
Ester coupling agent is put into blender, is stirred 35min under conditions of temperature is 82.5 DEG C and is obtained blend composition, blend composition is thrown
Enter in double screw extruder, extrusion molding is under conditions of extrusion temperature is 225 DEG C up to high-strength durable floor heating pipe.
It aoxidizes the preparation of slurries: being in mass ratio that 1:10 is thrown by the sulfuric acid solution that flaky graphite and mass fraction are 20%
Enter in beaker, 30min is mixed with the revolving speed of 350r/min with agitating device, mixed serum is made, is added into beaker mixed
The potassium permanganate powder for closing grind slurries quality 7% places the beaker in the water-bath that bath temperature is 35 DEG C, and constant temperature stands 60 DEG C of systems
Slurries must be aoxidized；
React the preparation of lotion:
It is in mass ratio in 10:1 investment three-necked flask, with stirring by the hydrogen peroxide that above-mentioned oxidation slurries and mass fraction are 15%
Dispersion liquid is made with the revolving speed stirring 50min of 550r/min in device, and the quality point of dispersion liquid quality 25% is added into three-necked flask
The liquor natrii hypochloritis that number is 15% continues that reaction lotion is made with the revolving speed stirring 40min of 550r/min with blender；
The preparation of mixed material:
Above-mentioned reaction lotion is poured into filter in suction filtration machine and obtains filter cake, cleans filter cake 5 with the ethanol solution that mass fraction is 40%
Secondary be to crush in 1:5 investment pulverizer with agricultural crop straw by modified-reaction solid to get modified-reaction solid in mass ratio,
It is put into baking oven after crushing, mixed material is made in dry 3h under conditions of temperature is 80 DEG C；
The preparation of tunning:
According to parts by weight, by 10 parts of mixed materials, 2 parts of starch, 4 parts of methane liquids, 1.0 parts of sodium citrates and 9 parts of water investment hairs
In fermentation tank, in the greenhouse for being 36 DEG C by fermentor temperature disposed within, constant temperature stands 5 days, filter cake is obtained by filtration after standing, with nothing
Water-ethanol cleans 5 obtained tunnings of filter cake；
The preparation of heat-treated products:
Above-mentioned tunning is put into tube furnace, nitrogen will be filled in tube furnace, nitrogen is passed through with the rate of 50mL/min, it will
Tubular type in-furnace temperature is increased to 120 DEG C, and constant temperature preheats 60min, tubular type in-furnace temperature is again raised to 400 DEG C, calcining at constant temperature
Heat-treated products are made in 3h, by heat-treated products；
The preparation of high-strength durable floor heating pipe:
According to parts by weight, by 12 parts of above-mentioned heat-treated products, 86 parts of polyethylene, 2.0 parts of azodicarbonamides, 1.0 parts of metatitanic acids
Ester coupling agent is put into blender, is stirred 40min under conditions of temperature is 85 DEG C and is obtained blend composition, blend composition is put into
In double screw extruder, extrusion molding is under conditions of extrusion temperature is 230 DEG C up to high-strength durable floor heating pipe.
Comparative example 1 and the preparation method of example 1 are essentially identical, have only the difference is that lacking mixed material.
Comparative example 2 and the preparation method of example 1 are essentially identical, have only the difference is that lacking heat-treated products.
The floor heating pipe of 3 Guangzhou company of comparative example production.
Performance detection is carried out to the floor heating pipe in the present invention and comparative example respectively, testing result is as shown in table 1:
Detection method:
Thermal coefficient is detected referring to GB/T10303-2001.
The easy fouling of tube wall, floor heating pipe tubing are 20.0 DEG C in air themperature according to GB/T1031-2009, and relative humidity is
Under 48% environmental condition, inside surface roughness detection is carried out.
Tensile strength is detected referring to GBT8804.1-2003.
Melt index (MI) testing standard is detected referring to GB/T9643.
Vicat softening point is detected referring to GB1633.
1 floor heating pipe performance measurement result of table
| Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Thermal coefficient W/(m.K) | 0.92 | 0.95 | 0.98 | 0.73 | 0.7 | 0.86 |
| Pipe internal surface roughness Ra (μm) | 0.079 | 0.082 | 0.088 | 0.51 | 0.45 | 0.65 |
| Tensile strength (MPa) | 56.8 | 57.2 | 58.2 | 48.6 | 45.8 | 50.3 |
| Melt index (MI) (230,5kg) | 0.61 | 0.64 | 0.69 | 0.45 | 0.42 | 0.51 |
| Vicat softening point (DEG C) | 128 | 132 | 135 | 103 | 100 | 110 |
By table 1, it can be seen that floor heating pipe heat transfer efficiency prepared by the present invention is high, heat-resisting endurance quality is good, and tube wall is less scaling,
Tensile strength is excellent, is a kind of high-strength durable floor heating pipe, has broad application prospects.
The foregoing is merely preferred modes of the invention, are not intended to limit the invention, all in spirit and original of the invention
Within then, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of preparation method of high-strength durable floor heating pipe, it is characterised in that specific preparation step are as follows:
Heat-treated products, polyethylene, azodicarbonamide, titanate coupling agent are put into blender, are 80~85 in temperature
It is stirred 30~40min under conditions of DEG C and obtains blend composition, blend composition is put into double screw extruder, is in extrusion temperature
Extrusion molding is under conditions of 220~230 DEG C up to high-strength durable floor heating pipe；
The specific preparation step of the heat-treated products are as follows:
(1) mixed material, starch, methane liquid, sodium citrate and water are putted into fermenter, is by fermentor temperature disposed within
In 32~36 DEG C of greenhouse, constant temperature stands 3~5 days, and filter cake is obtained by filtration after standing, is made with washes of absolute alcohol filter cake 3~5 times
Obtain tunning；
(2) tunning is put into tube furnace, nitrogen will be filled in tube furnace, nitrogen is passed through with the rate of 40~50mL/min
Tubular type in-furnace temperature is increased to 110~120 DEG C by gas, and constant temperature preheats 50~60min, and tubular type in-furnace temperature is increased again, permanent
Heat-treated products are made in 2~3h of temperature calcining, by heat-treated products；
The specific preparation step of the mixed material are as follows:
(1) sulfuric acid solution that flaky graphite and mass fraction are 15~20% is put into beaker, with agitating device with 300~
20~30min is mixed in the revolving speed of 350r/min, and mixed serum is made, potassium permanganate powder is added into beaker, by beaker
It is placed in the water-bath that bath temperature is 30~35 DEG C, constant temperature stands 50~60 DEG C and oxidation slurries are made；
(2) hydrogen peroxide that slurries and mass fraction are 12~15% will be aoxidized to put into three-necked flask, with agitating device with 500~
The revolving speed of 550r/min stirs 40~50min and dispersion liquid is made, and the secondary chlorine that mass fraction is 12~15% is added into three-necked flask
Acid sodium solution continues to be stirred 30~40min with the revolving speed of 500~550r/min with blender and be made to react lotion；
(3) reaction lotion is poured into filter in suction filtration machine and obtains filter cake, clean filter with the ethanol solution that mass fraction is 30~40%
Modified-reaction solid and agricultural crop straw are in 1:5 investment pulverizer to get modified-reaction solid by cake 3~5 times in mass ratio
It crushes, is put into baking oven after crushing, mixed material is made in dry 2~3h under conditions of temperature is 70~80 DEG C.
2. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: preferred by weight
Number meter is measured, the heat-treated products are 10~12 parts, polyethylene is 82~86 parts, azodicarbonamide is 1.5~2.0
Part, titanate coupling agent are 0.6~1.0 part.
3. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: heat-treated products
Specific preparation step (1) in it is preferred according to parts by weight, the mixed material is 8~10 parts, starch is 1~2 part, natural pond
Gas-liquid is 3~4 parts, sodium citrate is 0.6~1.0 part, water is 7~9 parts.
4. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: heat-treated products
Specific preparation step (2) described in temperature in tube furnace when calcining at constant temperature be 350~400 DEG C.
5. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: mixed material
The mass ratio for the sulfuric acid solution that flaky graphite and mass fraction described in specific preparation step (1) are 15~20% is 1:10.
6. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: mixed material
The quality for the potassium permanganate powder being added described in specific preparation step (1) into beaker is the 5~7% of mixed serum quality.
7. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: mixed material
The mass ratio for the hydrogen peroxide that oxidation slurries and mass fraction described in specific preparation step (2) are 12~15% is 10:1.
8. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: mixed material
The matter for the liquor natrii hypochloritis that the mass fraction being added described in specific preparation step (2) into three-necked flask is 12~15%
Amount is the 20~25% of dispersion liquid quality.
9. a kind of preparation method of high-strength durable floor heating pipe according to claim 1, it is characterised in that: mixed material
The mass ratio of modified-reaction solid described in specific preparation step (3) and agricultural crop straw is 1:5.
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Cited By (2)
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| CN110591662A (en) * | 2019-09-27 | 2019-12-20 | 陈文广 | Preparation method of anticorrosive antifreezing solution |
| CN112708187A (en) * | 2020-12-28 | 2021-04-27 | 中核同辐（长春）辐射技术有限公司 | Graphite alkene ground heating coil with high heat conductivity |
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| CN105131385A (en) * | 2015-07-29 | 2015-12-09 | 天津金发新材料有限公司 | High-oxygen barrier property high-strength polyolefin heat conduction pipe and preparation method thereof |
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| CN112708187A (en) * | 2020-12-28 | 2021-04-27 | 中核同辐（长春）辐射技术有限公司 | Graphite alkene ground heating coil with high heat conductivity |
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Application publication date: 20190719 |