CN107574720A - A kind of preparation method for the air filter paper for purifying air - Google Patents
A kind of preparation method for the air filter paper for purifying air Download PDFInfo
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Abstract
The present invention proposes a kind of preparation method for the air filter paper for purifying air, and the filter paper first uses terephthalamide surface modified fibre copy paper, then adsorbs the gel of glycerine and silica.Scheme disclosed by the invention significantly enhances sensitiveness of the filter paper to humidity so that the paper hygroscopicity significantly improves, and allows the pollutant such as hydrogen sulfide, hydrogen cyanide and sulfur dioxide in the effective absorption air of the paper.Preparation technology of the present invention is simple, and raw material sources are extensive, pollution-free, and cost is low, and the forerunner's volume property prepared is stable, and easily storage transports, it is easy to accomplish scale industrial production.
Description
Technical field
The present invention relates to pulp technology for making paper, and in particular to a kind of preparation method for the air filter paper for purifying air.
Background technology
With the fast development of China's economy and the continuous improvement of urbanization degree, urban air problem of environmental pollution is increasingly
Seriously, the harm of air pollution is increasingly known, and the species of air pollutants is a lot, has produced harm, by
The pollutant that people pay attention to has tens of kinds.Have at present to environmental quality considerable influence have dust, sulphur oxidation as, nitrogen oxides,
Hydrocarbon and photochemical fog etc..Harmful substance enters human body by the direct breathing of people in air；It is attached to food
Or water is dissolved in, invade human body with drinking-water, diet；By contacting or stimulating skin to enter human body.Air pollution is seriously made
The development of Yue Liao China urban economy, the health of its people is threatened, causes people to pay much attention to.It is therefore prevented that air is dirty
The task of dye is extremely urgent, turns into the focus of society.
In order to improve air quality, the use of air filting material is more and more extensive, and the dosage of filtering material is estimated also will
With annual double-digit speed increase.Air filter paper is one kind in air filting material, has filter efficiency high, chemistry is steady
The advantages that qualitative good, it is widely used in integrated circuit, pharmaceutical sanitary field.Filtering material fiber diameter is smaller, removes micro- in air
For the particle diameter of grain with regard to smaller, filter efficiency is also higher.It is empty that China Patent Publication No. 101766929A discloses a kind of nanofiber
Gas filter paper, it is made up of nanoscale fibrillating fibre paper pulp of the Canadian Standard Freeness less than 45, thickness is less than or equal to
0.25mm, in air cleaner, increasing filter area, air velocity is reduced, makes Filtration Filtration SR lower, and
Because of the reduction of air velocity, improve particulate and intercept power.
But in current indoor environment, due to being rich in a large amount of gaseous states and fume, these gaseous states in air
And fume is attached on dust granule.When dust suction, it is from dust granule surface desorption, so as to reenter interior
The gas of environment, air is caused to be polluted again.And traditional air filter paper, it can only often filter some tiny particulates
Thing, and to some pernicious gases such as sulfur dioxide, hydrogen sulfide etc. in air also be present, then it can not reach good clean-up effect,
So need to develop a kind of air filter paper that can play some pernicious gases in air catharsis significant.
China Patent Publication No. 106192593A discloses a kind of preparation method of the enhanced air filter paper of Ulva lactuca L, makes
A kind of new air filter paper is made with the different short glass fiber of fibre diameter and microglass fiber, while adds Hai Qing
Dish, further improve filter effect.The invention is made double using the different short glass fiber of fibre diameter and microglass fiber
The compound air filter paper of layer, improves filter efficiency, while reduces windage, improves dust containing capacity, while increase Hai Qing
Dish additive, on the one hand the filter effect of the pernicious gases such as PARA FORMALDEHYDE PRILLS(91,95) can be further improved, and further increase appearance dirt
Amount.But removing is not only needed in fields such as integrated circuit, microelectric technique, health cares to the fume in air
And gas pollutant, humidity in air also there are certain requirements, and existing air filter paper can't reach above-mentioned simultaneously and want
Ask.
The content of the invention
For air filter paper of the prior art only to fume filter, and to pernicious gas such as sulfur dioxide,
Hydrogen sulfide, hydrogen cyanide or wet gas are felt simply helpless.After these pernicious gases get in environment, cause room air dirty
Dye, resident family is inevitably encroached on by these gases.Therefore, the present invention proposes a kind of air filter paper for purifying air
Preparation method, by using terephthalamide surface modified fibre, glycerine and silica dioxide gel are adsorbed again after copy paper.Should
Technique not only increases sensitiveness of the filter paper to humidity so that the paper hygroscopicity significantly improves, and the paper is had
The pollutant such as hydrogen sulfide, hydrogen cyanide and sulfur dioxide in the absorption air of effect.
To solve the above problems, the present invention uses following technical scheme：
A kind of method for the air filter paper for preparing purification air, comprises the following steps：
（1）Raw material is weighed by weight：Paper-making fibre 20-40 parts, dispersion solvent 20-40 parts, terephthalamide 5-10 parts；Draw
Send out agent 1-2 parts；Wherein, the paper-making fibre is the mixing of one or both of string and mineral fibres, the plant
Fiber is mixing more than one or both of wood fibre, stem fiber, seed wool fibre and bast fiber, and the plant is fine
The length of dimension is 10-40 μm, and a diameter of 0.3-1 μm, the mineral fibres is wollastonite fibre, alumina fibre, magnesia fibre
Mixing more than one or both of dimension, green stone cotton fiber, chrysotile asbestos fibre and glass fibre, the length of the mineral fibres
For 10-20 μm, a diameter of 50-160nm, the dispersion solvent is dimethylbenzene, ethanol, acetone, one kind in deionized water or two
The combination of the kind above, the initiator is isopropyl benzene hydroperoxide, TBHP, cumyl peroxide and peroxidating
At least one of two tertiary fourths；
（2）The paper-making fibre is added in aqueous sulfuric acid to be beaten and disperses to obtain slurry；
（3）The terephthalamide is added in the dispersion solvent, after stirring, is mixed with the slurry, passes through machine
Tool stirs, and rise temperature is added dropwise initiator, mechanical agitation is kept during dropwise addition, is obtained to benzene two to after 50-70 DEG C
Formamide modified slurry；
（4）Using papermaking process, then the drying at 100-110 DEG C, prepares the modification of surface aggregate terephthalamide
Filter paper, the filter paper that the surface aggregate terephthalamide is modified immerses glycerine and in silica dioxide gel, absorption is sweet
After oil, as sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
Preferably, the pH value of the aqueous sulfuric acid is 2.8-3.5, and the beating degree is 40-50 ° of SR.
Preferably, the pH value that slurry is obtained after mashing terminates is 4.1-4.9.
Preferably, the initiator rate of addition is 2-10mL/ minutes.
Preferably, step（3）The mixing speed is 120-300 rpm, and mixing time is 20-80 minutes.
Preferably, step（4）The immersion glycerine and silica dioxide gel, refer to glycerine with silica with mass ratio
100:The gel that 20-30 is formed, the time for immersing absorption is 20-40 minutes, and temperature control is at 50-80 DEG C.
Air filter paper of the prior art only filters to fume, and to pernicious gas such as sulfur dioxide, vulcanization
Hydrogen, hydrogen cyanide or wet gas are felt simply helpless.In consideration of it, the present invention proposes a kind of preparation side for the air filter paper for purifying air
Method, the filter paper first use terephthalamide surface modified fibre copy paper, then adsorb the gel of glycerine and silica.This
The scheme of disclosure of the invention significantly enhances sensitiveness of the filter paper to humidity so that the paper hygroscopicity significantly improves, and causes
The paper can the effective pollutant such as hydrogen sulfide, hydrogen cyanide and sulfur dioxide in absorption air.Preparation technology of the present invention is simple, former
Expect wide material sources, pollution-free, cost is low, and the forerunner's volume property prepared is stable, and easily storage transports, it is easy to accomplish large-scale industrial
Production.
Typically applying for one is：By air filter paper of the present invention addition in air purifier, the contrast of its main performance
It is as shown in table 1 below.
Table 1：
The present invention propose it is a kind of purify air air filter paper preparation method, compared with prior art, its protrude the characteristics of
It is with excellent effect：
1st, a kind of air filter paper for purifying air provided by the invention, surface are increased sweet using terephthalamide modified fibre
The absorption of oil, by pernicious gases such as the glycerine moisture absorption and adsorption of hydrogen sulfide in hole, hydrogen cyanide and sulfur dioxide, is played to having
The effect of evil gas purification.
2nd, surface modification technology and physical adsorption process are combined by this programme, improve filter paper to the quick of air humidity
Perception.
3rd, preparation technology of the present invention is simple, and raw material sources are extensive, pollution-free, and cost is low, and the forerunner's volume property prepared is steady
Fixed, easily storage transports, it is easy to accomplish scale industrial production, more place assemblings.
Embodiment
Below by way of embodiment, the present invention is described in further detail, but this should not be interpreted as to the present invention
Scope be only limitted to following example.In the case where not departing from above method thought of the present invention, according to ordinary skill
The various replacements or change that knowledge and customary means are made, should be included in the scope of the present invention.
Embodiment 1
（1）40 parts of paper-making fibre is weighed by weight, and paper-making fibre is that length is 10 μm, a diameter of 1 μm of string and length
For 10 μm, the composite fibre of a diameter of 160nm mineral fibres, string is wood fibre, and mineral fibres is wollastonite fibre,
40 parts of dimethylbenzene, 10 parts of terephthalamide；2 parts of isopropyl benzene hydroperoxide；
（2）It is 40 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 2.8, and is beaten the scattered beating degree that obtains, pH value
For 4.9 slurries；
（3）Terephthalamide is added in dimethylbenzene, after stirring, mixed with the slurry, it is uniform by mechanical agitation,
It is 2-10mL/ points that temperature, which is raised, to initiator isopropyl benzene hydroperoxide, isopropyl benzene hydroperoxide rate of addition after 70 DEG C, is added dropwise
Clock, mechanical agitation is kept during dropwise addition, mixing speed is 300 rpm, and mixing time is 20 minutes, obtains paraphenylene terephthalamide
Amine modified slurry；
（4）Using papermaking process, then the drying at 100 DEG C, prepares the filtering of surface aggregate terephthalamide modification
Paper, the filter paper that the surface aggregate terephthalamide is modified are immersed in glycerine and silica dioxide gel, the time of absorption
For 40 minutes, temperature control after adsorbing glycerine, drained surface glycerine, ensures that glycerine is filled between the gap of fiber at 50 DEG C, makees
For sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
After carrying out performance test to the air filter paper prepared in embodiment, it is as shown in table 2 to obtain data.
Embodiment 2
（1）20 parts of paper-making fibre is weighed by weight, and paper-making fibre is that length is 40 μm, a diameter of 0.3 μm of string and length
Spend for 12 μm, the composite fibre of a diameter of 50nm mineral fibres, string is wood fibre, stem fiber, seed wool fibre mix
Close, mineral fibres is the mixing of wollastonite fibre, magnesia fibers, chrysotile asbestos fibre and glass fibre, 40 parts of ethanol, to benzene two
5 parts of formamide；1 part of TBHP；
（2）It is 45 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 2.9, and is beaten the scattered beating degree that obtains, pH value
For 4.1 slurries；
（3）The terephthalamide is added in ethanol, after stirring, mixed with the slurry, mixed volume ratio is 1:
1.3, uniform by mechanical agitation, speed is added dropwise to TBHP, TBHP after 55 DEG C, is added dropwise in rise temperature
Spend for 10mL/ minutes, mechanical agitation is kept during dropwise addition, mixing speed is 150 rpm, and mixing time is 80 minutes, is obtained
To terephthalamide modified slurry；
（4）Using papermaking process, then the drying at 105 DEG C, prepares the filtering of surface aggregate terephthalamide modification
Paper, the filter paper that the surface aggregate terephthalamide is modified are immersed in glycerine and silica dioxide gel, the time of absorption
For 25 minutes, temperature control after adsorbing glycerine, drained surface glycerine, ensures that glycerine is filled between the gap of fiber at 60 DEG C, makees
For sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
After carrying out performance test to the air filter paper prepared in embodiment, it is as shown in table 2 to obtain data.
Embodiment 3
（3）Weigh 30 parts of paper-making fibre by weight, paper-making fibre is that length is 25 μm, a diameter of 0.5 μm of seed wool fibre and
Bast fiber mixture, 35 parts of deionized water, 8 parts of terephthalamide；1.5 parts of cumyl peroxide；
（2）It is 48 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 3.0, and is beaten the scattered beating degree that obtains, pH value
For 4.7 slurries；
（3）The terephthalamide is added in deionized water, after stirring, mixes with the slurry, is stirred by machinery
To mix uniformly, cumyl peroxide is added dropwise to after 56 DEG C in rise temperature, and cumyl peroxide rate of addition is 8mL/ minutes,
Mechanical agitation is kept during dropwise addition, mixing speed is 220 rpm, and mixing time is 45 minutes, obtains terephthalamide
Modified slurry；
（4）Using papermaking process, then the drying at 108 DEG C, prepares the filtering of surface aggregate terephthalamide modification
Paper, the filter paper that the surface aggregate terephthalamide is modified are immersed in glycerine and silica dioxide gel, the time of absorption
For 20 minutes, temperature control after adsorbing glycerine, drained surface glycerine, ensures that glycerine is filled between the gap of fiber at 75 DEG C, makees
For sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
After carrying out performance test to the air filter paper prepared in embodiment, it is as shown in table 2 to obtain data.
Embodiment 4
（1）Weigh 35 parts of paper-making fibre by weight, paper-making fibre is 15 μm of length, a diameter of 130nm alumina fibre, oxygen
Change magnesium fiber, green stone cotton fiber, 26 parts of chrysotile asbestos fibre mixture, ethanol and deionized water, 8 parts of terephthalamide；Tertiary fourth
1.5 parts of base hydrogen peroxide；
（2）It is 48 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 3.2, and is beaten the scattered beating degree that obtains, pH value
For 4.4 slurries；
（3）The terephthalamide is added in ethanol and deionized water, after stirring, mixes, passes through with the slurry
Mechanical agitation is uniform, and TBHP is added dropwise to after 58 DEG C in rise temperature, and TBHP rate of addition is
10mL/ minutes, keep mechanical agitation during dropwise addition, mixing speed is 250 rpm, and mixing time is 70 minutes, is obtained pair
Benzenedicarboxamide modified slurry；
（4）Using papermaking process, then the drying at 100 DEG C, prepares the filtering of surface aggregate terephthalamide modification
Paper, the filter paper that the surface aggregate terephthalamide is modified are immersed in glycerine and silica dioxide gel, the time of absorption
For 25 minutes, temperature control after adsorbing glycerine, drained surface glycerine, ensures that glycerine is filled between the gap of fiber at 65 DEG C, makees
For sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
After carrying out performance test to the air filter paper prepared in embodiment, it is as shown in table 2 to obtain data.
Embodiment 5
（1）28 parts of paper-making fibre is weighed by weight, and paper-making fibre is that length is 15 μm, a diameter of 0.6 μm of wood fibre, cane
Mixing in fiber, seed wool fibre and bast fiber, 35 parts of deionized water, 9 parts of terephthalamide；Isopropyl benzene hydroperoxide 1
Part；
（2）It is 42 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 3.2, and is beaten the scattered beating degree that obtains, pH value
For 4.6 slurries；
（3）The terephthalamide is added in deionized water, after stirring, mixes with the slurry, is stirred by machinery
Mix uniformly, to after 52 DEG C isopropyl benzene hydroperoxide is added dropwise, rate of addition is 9mL/ minutes, is protected during dropwise addition in rise temperature
Mechanical agitation is held, mixing speed is 300 rpm, and mixing time is 45 minutes, obtains terephthalamide modified slurry；
（4）Using papermaking process, then the drying at 110 DEG C, prepares the filtering of surface aggregate terephthalamide modification
Paper, the filter paper that the surface aggregate terephthalamide is modified are immersed in glycerine and silica dioxide gel, the time of absorption
For 27 minutes, temperature control after adsorbing glycerine, drained surface glycerine, ensures that glycerine is filled between the gap of fiber at 68 DEG C, makees
For sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
After carrying out performance test to the air filter paper prepared in embodiment, it is as shown in table 2 to obtain data.
Embodiment 6
（1）35 parts of paper-making fibre is weighed by weight, and paper-making fibre is that length is 20 μm, a diameter of 155nm alumina fibres, oxygen
Change the mixing of magnesium fiber, green stone cotton fiber, chrysotile asbestos fibre and glass fibre, 26 parts of acetone, 7 parts of terephthalamide；Isopropyl
2 parts of benzene hydrogen peroxide；
（2）It is 48 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 3.4, and is beaten the scattered beating degree that obtains, pH value
For 4.3 slurries；
（3）The terephthalamide is added in acetone, after stirring, mixed with the slurry, it is equal by mechanical agitation
Even, to after 70 DEG C isopropyl benzene hydroperoxide is added dropwise, rate of addition is 2mL/ minutes, and machine is kept during dropwise addition in rise temperature
Tool stirs, and mixing speed is 180 rpm, and mixing time is 75 minutes, obtains terephthalamide modified slurry；
（4）Using papermaking process, then the drying at 110 DEG C, prepares the filtering of surface aggregate terephthalamide modification
Paper, the filter paper that the surface aggregate terephthalamide is modified are immersed in glycerine and silica dioxide gel, the time of absorption
For 35 minutes, temperature control after adsorbing glycerine, drained surface glycerine, ensures that glycerine is filled between the gap of fiber at 55 DEG C, makees
For sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
After carrying out performance test to the air filter paper prepared in embodiment, it is as shown in table 2 to obtain data.
Comparative example 1
（1）35 parts of paper-making fibre is weighed by weight, and paper-making fibre is that length is 20 μm, a diameter of 155nm alumina fibres, oxygen
Change the mixing of magnesium fiber, green stone cotton fiber, chrysotile asbestos fibre and glass fibre, 26 parts of acetone；2 parts of isopropyl benzene hydroperoxide；
（2）It is 48 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 3.4, and is beaten the scattered beating degree that obtains, pH value
For 4.3 slurries；
（3）By the slurry, to after 70 DEG C isopropyl benzene hydroperoxide is added dropwise, rate of addition is 2mL/ minutes, is being dripped in rise temperature
Mechanical agitation is kept during adding, mixing speed is 180 rpm, and mixing time is 75 minutes, obtains modified slurry；
（4）Using papermaking process, then the drying at 110 DEG C, prepares modified filter paper, by the filter paper of the modification
Immerse in glycerine, the time of glycerine absorption is 35 minutes, and after adsorbing glycerine, it is sweet to drain surface at 55 DEG C for the temperature control of glycerine
Oil, ensure that glycerine is filled between the gap of fiber, as sandwich material, be placed between the filter paper of two layers of unadsorbed glycerine, obtain
To the air filter paper.
After the air filter paper prepared in comparative example 1 carries out performance test, it is as shown in table 2 to obtain data.
Comparative example 2
（1）35 parts of paper-making fibre is weighed by weight, and paper-making fibre is that length is 20 μm, a diameter of 155nm alumina fibres, oxygen
Change the mixing of magnesium fiber, green stone cotton fiber, chrysotile asbestos fibre and glass fibre, 26 parts of acetone, 7 parts of terephthalamide；Isopropyl
2 parts of benzene hydrogen peroxide；
（2）It is 48 ° of SR that paper-making fibre, which is added in the aqueous sulfuric acid that pH value is 3.4, and is beaten the scattered beating degree that obtains, pH value
For 4.3 slurries；
（3）The terephthalamide is added in acetone, after stirring, mixed with the slurry, it is equal by mechanical agitation
Even, to after 70 DEG C isopropyl benzene hydroperoxide is added dropwise, rate of addition is 2mL/ minutes, and machine is kept during dropwise addition in rise temperature
Tool stirs, and mixing speed is 180 rpm, and mixing time is 75 minutes, obtains terephthalamide modified slurry；
（4）Using papermaking process, then the drying at 110 DEG C, prepares the filtering of surface aggregate terephthalamide modification
Paper, the filter paper that the surface aggregate terephthalamide is modified.
After the air filter paper that comparative example 2 prepares carries out performance test, it is as shown in table 2 to obtain data.
The filter paper that embodiment 1-6, comparative example 1-2 are obtained is used for the filter core of air cleaner, tests empty to same environment
The filter efficacy of the pollutant such as hydrogen sulfide and sulfur dioxide in gas, as shown in table 2.
Table 2:
Claims (6)
1. a kind of method for the air filter paper for preparing purification air, comprises the following steps：
（1）Raw material is weighed by weight：Paper-making fibre 20-40 parts, dispersion solvent 20-40 parts, terephthalamide 5-10 parts；Draw
Send out agent 1-2 parts；Wherein, the paper-making fibre is the mixing of one or both of string and mineral fibres, the plant
Fiber is mixing more than one or both of wood fibre, stem fiber, seed wool fibre and bast fiber, and the plant is fine
The length of dimension is 10-40 μm, and a diameter of 0.3-1 μm, the mineral fibres is wollastonite fibre, alumina fibre, magnesia fibre
Mixing more than one or both of dimension, green stone cotton fiber, chrysotile asbestos fibre and glass fibre, the length of the mineral fibres
For 10-20 μm, a diameter of 50-160nm, the dispersion solvent is dimethylbenzene, ethanol, acetone, one kind in deionized water or two
The combination of the kind above, the initiator is isopropyl benzene hydroperoxide, TBHP, cumyl peroxide and peroxidating
At least one of two tertiary fourths；
（2）The paper-making fibre is added in aqueous sulfuric acid to be beaten and disperses to obtain slurry；
（3）The terephthalamide is added in the dispersion solvent, after stirring, is mixed with the slurry, passes through machine
Tool stirs, and rise temperature is added dropwise initiator, mechanical agitation is kept during dropwise addition, is obtained to benzene two to after 50-70 DEG C
Formamide modified slurry；
（4）Using papermaking process, then the drying at 100-110 DEG C, prepares the modification of surface aggregate terephthalamide
Filter paper, the filter paper that the surface aggregate terephthalamide is modified immerses glycerine and in silica dioxide gel, absorption is sweet
After oil, as sandwich material, it is placed between the filter paper of two layers of unadsorbed glycerine, obtains the air filter paper.
A kind of 2. method for the air filter paper for preparing purification air according to claim 1, it is characterised in that：The sulfuric acid
The pH value of the aqueous solution is 2.8-3.5, and the beating degree is 40-50 ° of SR.
A kind of 3. method for the air filter paper for preparing purification air according to claim 1, it is characterised in that：Mashing terminates
The pH value for obtaining slurry afterwards is 4.1-4.9.
A kind of 4. method for the air filter paper for preparing purification air according to claim 1, it is characterised in that：The initiation
Agent rate of addition is 2-10mL/ minutes.
A kind of 5. method for the air filter paper for preparing purification air according to claim 1, it is characterised in that：Step（3）
The mixing speed is 120-300 rpm, and mixing time is 20-80 minutes.
A kind of 6. method for the air filter paper for preparing purification air according to claim 1, it is characterised in that：Step（4）
The immersion glycerine and silica dioxide gel, refer to glycerine with silica with mass ratio 100:The gel that 20-30 is formed, immerse
The time of absorption is 20-40 minutes, and temperature control is at 50-80 DEG C.
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| CN113457378A (en) * | 2021-09-06 | 2021-10-01 | 海安迪斯凯瑞探测仪器有限公司 | Heat-repelling type automatic spraying system |
| CN113476991A (en) * | 2021-09-08 | 2021-10-08 | 海安迪斯凯瑞探测仪器有限公司 | Automatic spraying system is with from expanding filter equipment |
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| CN109569537B (en) * | 2018-12-13 | 2021-08-10 | 齐鲁工业大学 | Preparation method and application of paper-based sulfur dioxide/hydrogen sulfide adsorption material |
| CN113457378A (en) * | 2021-09-06 | 2021-10-01 | 海安迪斯凯瑞探测仪器有限公司 | Heat-repelling type automatic spraying system |
| CN113476991A (en) * | 2021-09-08 | 2021-10-08 | 海安迪斯凯瑞探测仪器有限公司 | Automatic spraying system is with from expanding filter equipment |
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