CN108905539A - A kind of preparation method of composite bentonite desiccant - Google Patents
A kind of preparation method of composite bentonite desiccant Download PDFInfo
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Abstract
The invention discloses a kind of preparation methods of composite bentonite desiccant, belong to desiccant preparation technical field.It will modified sodium bentonite and water in mass ratio 1：5~1：12 mixing, and the urea of 3~6 times of modified sodium bentonite quality is added, the graphene oxide solution of the sodium carboxymethylcellulose of modified 2~3 times of sodium bentonite quality and modified 1~2 times of sodium bentonite quality, after being stirred, pretreatment modification Na-bentonite earth mixtures is obtained, by pretreatment modification Na-bentonite earth mixtures and aluminium chloride mixed solution in mass ratio 1：5~1：12 mixing are filtered after stirring solidification, dry, obtain composite bentonite desiccant.Gained composite bentonite desiccant of the invention has excellent moisture pick-up properties.
Description
Technical field
The invention discloses a kind of preparation methods of composite bentonite desiccant, belong to desiccant preparation technical field.
Background technique
Desiccant is a kind of deicer that moisture is absorbed from atmosphere, is by Water Molecular Adsorption by physics mode in itself knot
In structure or hydrone is absorbed by chemical mode and changes its chemical structure, becomes another substance.It is suitable for preventing instrument
Device, instrument, electrical equipment, drug, food, textile and other various packing article dampness.Cargo Chang Yin during transportation
Temperature is high and becomes damp and rotten, and electronic product also be easy to cause metal to aoxidize, and causes performance bad.The use of desiccant is intended to
Extra moisture is avoided to cause the undesirable generation of product quality.
At present market using it is more be exactly silica-gel desiccant, acid, alkalinity desiccant and molecular sieve desiccant.Silica gel is dry
Drying prescription is usually to use sodium metasilicate and sulfuric acid reaction, and be made through a series for the treatment of processes such as aging, acid bubbles, and raw materials for production are danger
Dangerous product, process are more complicated.Acid, the general water absorbing capacity of alkaline desiccant are bigger, and rate of drying mostly cannot also than very fast
Regeneration uses.Molecular sieve desiccant is a kind of desiccant product that is artificial synthesized and having stronger adsorptivity to hydrone, belongs to crystallization
Type alumino-silicate compound has regular and uniform duct in crystal structure, and aperture is the order of magnitude of molecular size, but it is made
Standby process is more complicated, and using effect is also restricted.
Hydrone can be adsorbed and be released between montmorillonite crystal layer in bentonite, can be used for drying moisture absorption.Bentonite desiccant
Adsorption rate is fast, and adsorption capacity is strong, can adsorb and be equivalent to 8~20 times of own vol of water and be expanded to 30 times, more there is stronger sun
Ion-exchange capacity and adsorption capacity, nontoxic, tasteless, contactless property burn into is pollution-free（It can 100% degradation）, especially to human body without
Injury.Product absorption property under room temperature and general humidity is good, has the function such as adsorption activity, static dehumidification and peculiar smell removal
Effect, be widely used in it is each need in dry industry, especially cannot using in the product that oil sealing, gas phase are sealed up for safekeeping, such as：Optics instrument
The seal-packed moisture-proof, moisture absorptions, anti-mildew etc. such as device, electronic product, medical health care, food, the product for civilian use, container sea-freight,
In addition to this, also adsorbable other pernicious gases.Because its bentonite desiccant is nontoxic, tasteless, non-corrosive, cheap, then
Raw Reusability ability is strong, and therefore, which has the potentiality of very big market competition.But traditional bentonite desiccant is inhaled
Wet performance can not further increase, therefore also need to study it.
Summary of the invention
The present invention solves the technical problem of：It is asked for what traditional bentonite desiccant moisture pick-up properties can not further increase
Topic, provides a kind of preparation method of composite bentonite desiccant.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that：
（1）By sodium bentonite and silica solution in mass ratio 7：1~8：1 mixing, and it is added 2~3 times of sodium bentonite quality
Chitosan acetic acid solution and 0.02~0.03 times of sodium bentonite quality of boric acid, after being stirred, filtering obtains sodium bentonite
Mixture；
（2）By Na-bentonite earth mixtures and sodium hydroxide solution in mass ratio 1：8~1：10 mixing, impregnate, and filtering must filter
Cake, by filter cake and water in mass ratio 1：8~1：10 mixing, impregnate, filtering, after being repeated twice immersion-filter process 3~5 times, do
It is dry, obtain pre- modified sodium bentonite；
（3）By pre- modified sodium bentonite and water in mass ratio 1：10~1：15 mixing, and pre- modified Na-bentonite soil property is added
After ultrasonic disperse, the acrylamide of pre- 0.2~0.4 times of modified sodium bentonite quality is added in 0.1~0.3 times of magnesium chloride of amount,
Pre- 0.08~0.12 times of modified sodium bentonite quality of N, N '-methylene-bisacrylamide, after being stirred, and in nitrogen atmosphere
Lower 0.05~0.07 times of initiator of addition quality is enclosed, after being stirred to react, filtering obtains modified sodium bentonite；
（4）It will modified sodium bentonite and water in mass ratio 1：5~1：12 mixing, and modified sodium bentonite quality 3~6 is added
Urea again, the sodium carboxymethylcellulose of modified 2~3 times of sodium bentonite quality and modified 1~2 times of sodium bentonite quality
Graphene oxide solution after being stirred, obtains pretreatment modification Na-bentonite earth mixtures, by pretreatment modification sodium bentonite
Mixture and aluminium chloride mixed solution in mass ratio 1：5~1：12 mixing are filtered after stirring solidification, dry, obtain composite bentonite
Desiccant.
Step（1）The partial size of the sodium bentonite is 100 mesh.
Step（1）The chitosan is the chitosan compound of deacetylation 90~95%.
Step step（3）The initiator is potassium peroxydisulfate, any one in ammonium persulfate or sodium peroxydisulfate.
Step（4）The aluminium chloride mixed solution is will be by aluminium chloride and water in mass ratio 1：10~1：18 mixing, and add
Enter 1~2 times of aluminium chloride quality of glutaraldehyde and 0.2~0.4 times of aluminium chloride of calcium chloride, after being stirred, it is mixed that aluminium chloride must be stated
Close solution.
Step（4）The graphene oxide solution is by graphene oxide and water in mass ratio 1：100~1：200 mixing,
Ultrasonic disperse obtains graphene oxide solution.
The beneficial effects of the invention are as follows：
（1）Silica solution and chitosan are added when preparing composite bentonite desiccant by the present invention, firstly, the silica solution and shell that are added
In the interlayer structure that glycan can enter sodium bentonite in sodium bentonite water-swellable, to make sodium bentonite interlayer knot
Structure is widened, and then improves the hydroscopicity of product, secondly, the silica and chitosan that contain in silica solution can be in treatment processes
Middle grafted polyacrylamide, to form cross-linked network in sodium bentonite interlayer structure, due to cross-linked network formation and
The suction-operated of polyacrylamide, therefore, magnesium chloride can be adsorbed in the interlayer structure for being bonded to sodium bentonite, and then make to produce
The hydroscopicity of product further increases, furthermore, the silica solution and chitosan of addition can impregnate at filtering in product preparation process
When reason, lamellar structure is formed in the interlayer structure of sodium bentonite, to keep the same of structure between sodium bentonite wider layer
When, increase interior porosity, and then improve the hygroscopicity of product；
（2）Sodium carboxymethylcellulose and graphene oxide are added when preparing composite bentonite desiccant by the present invention, on the one hand, add
The sodium carboxymethylcellulose and graphene oxide entered can be adsorbed in sodium base with Electrostatic Absorption by being crosslinked in product preparation process
In bentonite, so that the hydroscopicity of product be made to improve, on the other hand, the sodium carboxymethylcellulose of addition can be in product use process
In effectively prevent the moisture absorption of product from reuniting, and then improve the using effect of product, and the graphene oxide being added is adsorbable
On chitosan in sodium bentonite interlayer structure, so that the intensity of cross-linked network in interlayer structure be made to improve, and then make to produce
The hydroscopicity of product improves.
Specific embodiment
By sodium bentonite and silica solution in mass ratio 7：1~8：1 is mixed in beaker, and addition sodium base is swollen into beaker
The mass fraction of 2~3 times of soil property amount of profit is 5~10% chitosan acetic acid solution and 0.02~0.03 times of sodium bentonite quality
Boric acid, in temperature be 45~55 DEG C, revolving speed be 300~400r/min under conditions of, after being stirred 1~2h, filtering, obtain sodium
Base bentonite mixture；The sodium hydroxide solution in mass ratio 1 for being 8~12% by Na-bentonite earth mixtures and mass fraction：8
~1：10 mixing, after impregnating 1~2h under room temperature, filtering obtains filter cake, by filter cake and water in mass ratio 1：8~1：10 is mixed
It closes, after impregnating 1~2h under room temperature, after being repeated twice immersion-filter process 3~5 times, it is swollen to obtain pre- modified sodium base for filtering
Moisten sun-dried mud brick material, under conditions of being 60~70 DEG C in temperature by pre- modified sodium bentonite blank after dry 2~5h, obtains pre- modified sodium
Base bentonite；By pre- modified sodium bentonite and water in mass ratio 1：10~1：15 are mixed in four-hole boiling flask, and burn to four mouthfuls
Pre- 0.1~0.3 times of modified sodium bentonite quality of magnesium chloride is added in bottle, the ultrasound point under conditions of 45~55kHz of frequency
After dissipating 30~45min, pre- 0.2~0.4 times of modified sodium bentonite quality of acrylamide, pre- modification are added into four-hole boiling flask
The N that 0.08~0.12 times of sodium bentonite quality, N '-methylene-bisacrylamide, in temperature be 45~55 DEG C, revolving speed 300
Under conditions of~400r/min, after being stirred 30~50min, then it is passed through with the rate of 12~20mL/min into four-hole boiling flask
Nitrogen, and into four-hole boiling flask be added 0.05~0.07 times of initiator of quality, in temperature be 60~70 DEG C, revolving speed be 300~
Under conditions of 400r/min, after being stirred to react 1~2h, filtering obtains modified sodium bentonite；Modified sodium bentonite is pressed with water
Mass ratio 1：5~1：12 are mixed in flask, and the urea of modified 3~6 times of sodium bentonite quality is added into flask, modified
The graphene oxide of the sodium carboxymethylcellulose and modified 1~2 times of sodium bentonite quality that 2~3 times of sodium bentonite quality is molten
Liquid is 45~65 DEG C in temperature, under conditions of revolving speed is 500~1000r/min, after being stirred 30~60min, must pre-process
Pretreatment modification Na-bentonite earth mixtures is instilled pretreatment with the rate of 3~5mL/min by modified Na-bentonite earth mixtures
In the aluminium chloride mixed solution of modified 5~12 times of sodium bentonite mixture quality, in temperature be 35~60 DEG C, revolving speed 300
Under conditions of~400r/min, after 1~2h of stirring solidification, filtering obtains composite bentonite desiccant blank, composite bentonite is done
Under conditions of drying prescription blank is 45~60 DEG C in temperature after dry 1~3h, composite bentonite desiccant is obtained.The sodium bentonite
Partial size be 100 mesh.The chitosan is the chitosan compound of deacetylation 90~95%.The initiator is potassium peroxydisulfate,
Any one in ammonium persulfate or sodium peroxydisulfate.The aluminium chloride mixed solution is will be by aluminium chloride and water in mass ratio 1：10~
1：18 mixing, and 1~2 times of aluminium chloride quality of glutaraldehyde and 0.2~0.4 times of aluminium chloride of calcium chloride is added, after being stirred,
Aluminium chloride mixed solution must be stated.The graphene oxide solution is by graphene oxide and water in mass ratio 1：100~1：200 is mixed
It closes, ultrasonic disperse obtains graphene oxide solution.
Example 1
By sodium bentonite and silica solution in mass ratio 8：1 is mixed in beaker, and sodium bentonite quality 3 is added into beaker
Mass fraction again is 10% chitosan acetic acid solution and 0.03 times of sodium bentonite quality of boric acid, is 55 DEG C in temperature, turns
Under conditions of speed is 400r/min, after being stirred 2h, filtering obtains Na-bentonite earth mixtures；By Na-bentonite earth mixtures
The sodium hydroxide solution in mass ratio 1 for being 12% with mass fraction：10 mixing, after impregnating 2h under room temperature, filtering must be filtered
Cake, by filter cake and water in mass ratio 1：10 mixing, after impregnating 2h under room temperature, filtering is repeated twice immersion-filter process
After 5 times, pre- modified sodium bentonite blank is obtained, dry 5h under conditions of being 70 DEG C in temperature by pre- modified sodium bentonite blank
Afterwards, pre- modified sodium bentonite is obtained；By pre- modified sodium bentonite and water in mass ratio 1：15 are mixed in four-hole boiling flask, and to
Pre- 0.3 times of modified sodium bentonite quality of magnesium chloride, the ultrasonic disperse under conditions of frequency 55kHz are added in four-hole boiling flask
After 45min, pre- 0.4 times of modified sodium bentonite quality of acrylamide, pre- modified sodium bentonite are added into four-hole boiling flask
The N that 0.12 times of quality, N '-methylene-bisacrylamide are 55 DEG C in temperature, and under conditions of revolving speed is 400r/min, stirring is mixed
Rate after closing 50min, then into four-hole boiling flask with 20mL/min is passed through nitrogen, and 0.07 times of quality is added into four-hole boiling flask
Initiator is 70 DEG C in temperature, and under conditions of revolving speed is 400r/min, after being stirred to react 2h, filtering obtains modified Na-bentonite
Soil；It will modified sodium bentonite and water in mass ratio 1：12 are mixed in flask, and modified sodium bentonite is added into flask
The urea that 6 times of quality, the sodium carboxymethylcellulose of modified 3 times of sodium bentonite quality and modified 2 times of sodium bentonite quality
Graphene oxide solution is 65 DEG C in temperature, under conditions of revolving speed is 1000r/min, after being stirred 60min, must pre-process
Pretreatment modification Na-bentonite earth mixtures is instilled pretreatment with the rate of 5mL/min and changed by modified Na-bentonite earth mixtures
Property 12 times of mixture quality of sodium bentonite of aluminium chloride mixed solution in, be 60 DEG C in temperature, revolving speed is the item of 400r/min
Under part, after stirring solidification 2h, filtering obtains composite bentonite desiccant blank, is in temperature by composite bentonite desiccant blank
Under conditions of 60 DEG C after dry 3h, composite bentonite desiccant is obtained.The partial size of the sodium bentonite is 100 mesh.The shell is poly-
Sugar is the chitosan compound of deacetylation 95%.The initiator is potassium peroxydisulfate.The aluminium chloride mixed solution is will be by chlorine
Change aluminium and water in mass ratio 1：18 mixing, and 2 times of aluminium chloride quality of glutaraldehyde and 0.4 times of aluminium chloride of calcium chloride is added, it stirs
After mixing mixing, aluminium chloride mixed solution must be stated.The graphene oxide solution is by graphene oxide and water in mass ratio 1：200
Mixing, ultrasonic disperse obtain graphene oxide solution.
Example 2
Sodium bentonite is added in beaker, and 3 times of sodium bentonite quality of mass fraction is added as 10% shell into beaker
Glycan acetic acid solution and 0.03 times of sodium bentonite quality of boric acid, in temperature be 55 DEG C, revolving speed be 400r/min under conditions of,
After being stirred 2h, filtering obtains Na-bentonite earth mixtures；The hydrogen-oxygen for being 12% by Na-bentonite earth mixtures and mass fraction
Change sodium solution in mass ratio 1：10 mixing, after impregnating 2h under room temperature, filtering obtains filter cake, in mass ratio with water by filter cake
1：10 mixing, after impregnating 2h under room temperature, after being repeated twice immersion-filter process 5 times, it is swollen to obtain pre- modified sodium base for filtering
Moisten sun-dried mud brick material, under conditions of being 70 DEG C in temperature by pre- modified sodium bentonite blank after dry 5h, obtains pre- modified Na-bentonite
Soil；By pre- modified sodium bentonite and water in mass ratio 1：15 are mixed in four-hole boiling flask, and are added into four-hole boiling flask and change in advance
The magnesium chloride of 0.3 times of quality of sodium bentonite of property, under conditions of frequency 55kHz after ultrasonic disperse 45min, into four-hole boiling flask
Pre- 0.4 times of modified sodium bentonite quality of acrylamide, the N of pre- 0.12 times of modified sodium bentonite quality, N '-methylene is added
Base bisacrylamide, in temperature be 55 DEG C, under conditions of revolving speed is 400r/min, after being stirred 50min, then to four-hole boiling flask
In nitrogen is passed through with the rate of 20mL/min, and 0.07 times of initiator of quality is added into four-hole boiling flask, is 70 DEG C in temperature, turns
Under conditions of speed is 400r/min, after being stirred to react 2h, filtering obtains modified sodium bentonite；It will modified sodium bentonite and water
In mass ratio 1：12 are mixed in flask, and the urea of modified 6 times of sodium bentonite quality is added into flask, and modified sodium base is swollen
The graphene oxide solution of the sodium carboxymethylcellulose of 3 times of soil property amount of profit and modified 2 times of sodium bentonite quality, in temperature be 65
DEG C, under conditions of revolving speed is 1000r/min, after being stirred 60min, pretreatment modification Na-bentonite earth mixtures is obtained, it will be pre-
It handles modified Na-bentonite earth mixtures and 12 times of pretreatment modification sodium bentonite mixture quality is instilled with the rate of 5mL/min
Aluminium chloride mixed solution in, in temperature be 60 DEG C, revolving speed be 400r/min under conditions of, stirring solidification 2h after, filtering, must answer
Bentonite desiccant blank is closed, under conditions of being 60 DEG C in temperature by composite bentonite desiccant blank after dry 3h, is obtained compound
Bentonite desiccant.The partial size of the sodium bentonite is 100 mesh.The chitosan is that the chitosan of deacetylation 95% mixes
Object.The initiator is potassium peroxydisulfate.The aluminium chloride mixed solution is will be by aluminium chloride and water in mass ratio 1：18 mixing, and
2 times of aluminium chloride quality of glutaraldehyde and 0.4 times of aluminium chloride of calcium chloride is added, after being stirred, aluminium chloride mixed solution must be stated.
The graphene oxide solution is by graphene oxide and water in mass ratio 1：It is molten to obtain graphene oxide for 200 mixing, ultrasonic disperse
Liquid.
Example 3
By sodium bentonite and water in mass ratio 1：12 are mixed in flask, and 6 times of sodium bentonite quality are added into flask
Urea, the sodium carboxymethylcellulose and 2 times of sodium bentonite quality of graphene oxide solution that 3 times of sodium bentonite quality,
It is 65 DEG C in temperature, under conditions of revolving speed is 1000r/min, after being stirred 60min, sodium bentonite mixing must be pre-processed
Object will pre-process Na-bentonite earth mixtures with the rate of 5mL/min and instill 12 times of sodium bentonite mixture quality of pretreatment
Aluminium chloride mixed solution in, in temperature be 60 DEG C, revolving speed be 400r/min under conditions of, stirring solidification 2h after, filtering, must answer
Bentonite desiccant blank is closed, under conditions of being 60 DEG C in temperature by composite bentonite desiccant blank after dry 3h, is obtained compound
Bentonite desiccant.The partial size of the sodium bentonite is 100 mesh.The chitosan is that the chitosan of deacetylation 95% mixes
Object.The initiator is potassium peroxydisulfate.The aluminium chloride mixed solution is will be by aluminium chloride and water in mass ratio 1：18 mixing, and
2 times of aluminium chloride quality of glutaraldehyde and 0.4 times of aluminium chloride of calcium chloride is added, after being stirred, aluminium chloride mixed solution must be stated.
The graphene oxide solution is by graphene oxide and water in mass ratio 1：It is molten to obtain graphene oxide for 200 mixing, ultrasonic disperse
Liquid.
Example 4
By sodium bentonite and silica solution in mass ratio 8：1 is mixed in beaker, and sodium bentonite quality 3 is added into beaker
Mass fraction again is 10% chitosan acetic acid solution and 0.03 times of sodium bentonite quality of boric acid, is 55 DEG C in temperature, turns
Under conditions of speed is 400r/min, after being stirred 2h, filtering obtains Na-bentonite earth mixtures；By Na-bentonite earth mixtures
The sodium hydroxide solution in mass ratio 1 for being 12% with mass fraction：10 mixing, after impregnating 2h under room temperature, filtering must be filtered
Cake, by filter cake and water in mass ratio 1：10 mixing, after impregnating 2h under room temperature, filtering is repeated twice immersion-filter process
After 5 times, pre- modified sodium bentonite blank is obtained, dry 5h under conditions of being 70 DEG C in temperature by pre- modified sodium bentonite blank
Afterwards, pre- modified sodium bentonite is obtained；By pre- modified sodium bentonite and water in mass ratio 1：15 are mixed in four-hole boiling flask, and to
Pre- 0.3 times of modified sodium bentonite quality of magnesium chloride, the ultrasonic disperse under conditions of frequency 55kHz are added in four-hole boiling flask
After 45min, pre- 0.4 times of modified sodium bentonite quality of acrylamide, pre- modified sodium bentonite are added into four-hole boiling flask
The N that 0.12 times of quality, N '-methylene-bisacrylamide are 55 DEG C in temperature, and under conditions of revolving speed is 400r/min, stirring is mixed
Rate after closing 50min, then into four-hole boiling flask with 20mL/min is passed through nitrogen, and 0.07 times of quality is added into four-hole boiling flask
Initiator is 70 DEG C in temperature, and under conditions of revolving speed is 400r/min, after being stirred to react 2h, filtering obtains modified Na-bentonite
Soil；It will modified sodium bentonite and water in mass ratio 1：12 are mixed in flask, and modified sodium bentonite is added into flask
The graphene oxide solution of the urea and modified 2 times of sodium bentonite quality that 6 times of quality, is 65 DEG C in temperature, revolving speed is
Under conditions of 1000r/min, after being stirred 60min, pretreatment modification Na-bentonite earth mixtures is obtained, by pretreatment modification sodium
Base bentonite mixture is mixed with the aluminium chloride that the rate of 5mL/min instills 12 times of pretreatment modification sodium bentonite mixture quality
It closes in solution, is 60 DEG C in temperature, under conditions of revolving speed is 400r/min, after stirring solidification 2h, it is dry to obtain composite bentonite for filtering
It is dry to obtain composite bentonite under conditions of being 60 DEG C in temperature by composite bentonite desiccant blank after dry 3h for drying prescription blank
Agent.The partial size of the sodium bentonite is 100 mesh.The chitosan is the chitosan compound of deacetylation 95%.The initiation
Agent is potassium peroxydisulfate.The aluminium chloride mixed solution is will be by aluminium chloride and water in mass ratio 1：18 mixing, and aluminium chloride is added
The glutaraldehyde and 0.4 times of aluminium chloride of calcium chloride that 2 times of quality, after being stirred, must state aluminium chloride mixed solution.The oxidation stone
Black alkene solution is by graphene oxide and water in mass ratio 1：200 mixing, ultrasonic disperse obtain graphene oxide solution.
Example 5
By sodium bentonite and silica solution in mass ratio 8：1 is mixed in beaker, and sodium bentonite quality 3 is added into beaker
Mass fraction again is 10% chitosan acetic acid solution and 0.03 times of sodium bentonite quality of boric acid, is 55 DEG C in temperature, turns
Under conditions of speed is 400r/min, after being stirred 2h, filtering obtains Na-bentonite earth mixtures；By Na-bentonite earth mixtures
The sodium hydroxide solution in mass ratio 1 for being 12% with mass fraction：10 mixing, after impregnating 2h under room temperature, filtering must be filtered
Cake, by filter cake and water in mass ratio 1：10 mixing, after impregnating 2h under room temperature, filtering is repeated twice immersion-filter process
After 5 times, pre- modified sodium bentonite blank is obtained, dry 5h under conditions of being 70 DEG C in temperature by pre- modified sodium bentonite blank
Afterwards, pre- modified sodium bentonite is obtained；By pre- modified sodium bentonite and water in mass ratio 1：15 are mixed in four-hole boiling flask, and to
Pre- 0.3 times of modified sodium bentonite quality of magnesium chloride, the ultrasonic disperse under conditions of frequency 55kHz are added in four-hole boiling flask
After 45min, pre- 0.4 times of modified sodium bentonite quality of acrylamide, pre- modified sodium bentonite are added into four-hole boiling flask
The N that 0.12 times of quality, N '-methylene-bisacrylamide are 55 DEG C in temperature, and under conditions of revolving speed is 400r/min, stirring is mixed
Rate after closing 50min, then into four-hole boiling flask with 20mL/min is passed through nitrogen, and 0.07 times of quality is added into four-hole boiling flask
Initiator is 70 DEG C in temperature, and under conditions of revolving speed is 400r/min, after being stirred to react 2h, filtering obtains modified Na-bentonite
Soil；It will modified sodium bentonite and water in mass ratio 1：12 are mixed in flask, and modified sodium bentonite is added into flask
The urea that 6 times of quality, the sodium carboxymethylcellulose of modified 3 times of sodium bentonite quality, in temperature be 65 DEG C, revolving speed 1000r/
Under conditions of min, after being stirred 60min, pretreatment modification Na-bentonite earth mixtures is obtained, by pretreatment modification Na-bentonite
Earth mixtures instills the aluminium chloride mixed solution of 12 times of pretreatment modification sodium bentonite mixture quality with the rate of 5mL/min
In, it is 60 DEG C in temperature, under conditions of revolving speed is 400r/min, after stirring solidification 2h, filtering obtains composite bentonite desiccant base
Material obtains composite bentonite desiccant under conditions of being 60 DEG C in temperature by composite bentonite desiccant blank after dry 3h.It is described
The partial size of sodium bentonite is 100 mesh.The chitosan is the chitosan compound of deacetylation 95%.The initiator was
Potassium sulfate.The aluminium chloride mixed solution is will be by aluminium chloride and water in mass ratio 1：18 mixing, and it is added 2 times of aluminium chloride quality
Glutaraldehyde and 0.4 times of aluminium chloride of calcium chloride, after being stirred, aluminium chloride mixed solution must be stated.
Comparative example：The desiccant of Dongguan City Industrial Co., Ltd. production.
1 to 5 gained bentonite desiccant of example and comparative example product are subjected to performance detection, the specific detection method is as follows：
Moisture pick-up properties：At 25 DEG C of temperature in test, the environmental condition that relative humidity is 85% is carried out.It is weighed first by drying
Weighing bottle M1, sample to be tested is respectively put into weighing bottle, marks and be weighed as M by g2, g.Then it is respectively put into above
Drier in, and drier is sealed.Drier is placed for 24 hours in the environment of 25 DEG C.Taking out sample and weighing is M3, g.
According to formula C=（M3-M2）/（M2-M1）× 100% calculates hydroscopicity.
Specific testing result is as shown in table 1：
Table 1：Performance detection table
| Detection content | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example |
| Hydroscopicity/% | 42.1 | 37.8 | 35.3 | 38.4 | 36.2 | 23.6 |
By 1 testing result of table it is found that present invention gained composite bentonite desiccant has excellent moisture pick-up properties.
Claims (6)
1. a kind of preparation method of composite bentonite desiccant, which is characterized in that specifically preparation step is：
（1）By sodium bentonite and silica solution in mass ratio 7：1~8：1 mixing, and it is added 2~3 times of sodium bentonite quality
Chitosan acetic acid solution and 0.02~0.03 times of sodium bentonite quality of boric acid, after being stirred, filtering obtains sodium bentonite
Mixture；
（2）By Na-bentonite earth mixtures and sodium hydroxide solution in mass ratio 1：8~1：10 mixing, impregnate, and filtering must filter
Cake, by filter cake and water in mass ratio 1：8~1：10 mixing, impregnate, filtering, after being repeated twice immersion-filter process 3~5 times, do
It is dry, obtain pre- modified sodium bentonite；
（3）By pre- modified sodium bentonite and water in mass ratio 1：10~1：15 mixing, and pre- modified Na-bentonite soil property is added
After ultrasonic disperse, the acrylamide of pre- 0.2~0.4 times of modified sodium bentonite quality is added in 0.1~0.3 times of magnesium chloride of amount,
Pre- 0.08~0.12 times of modified sodium bentonite quality of N, N '-methylene-bisacrylamide, after being stirred, and in nitrogen atmosphere
Lower 0.05~0.07 times of initiator of addition quality is enclosed, after being stirred to react, filtering obtains modified sodium bentonite；
（4）It will modified sodium bentonite and water in mass ratio 1：5~1：12 mixing, and modified sodium bentonite quality 3~6 is added
Urea again, the sodium carboxymethylcellulose of modified 2~3 times of sodium bentonite quality and modified 1~2 times of sodium bentonite quality
Graphene oxide solution after being stirred, obtains pretreatment modification Na-bentonite earth mixtures, by pretreatment modification sodium bentonite
Mixture and aluminium chloride mixed solution in mass ratio 1：5~1：12 mixing are filtered after stirring solidification, dry, obtain composite bentonite
Desiccant.
2. a kind of preparation method of composite bentonite desiccant according to claim 1, it is characterised in that：Step（1）Institute
The partial size for stating sodium bentonite is 100 mesh.
3. a kind of preparation method of composite bentonite desiccant according to claim 1, it is characterised in that：Step（1）Institute
State the chitosan compound that chitosan is deacetylation 90~95%.
4. a kind of preparation method of composite bentonite desiccant according to claim 1, it is characterised in that：Step step
（3）The initiator is potassium peroxydisulfate, any one in ammonium persulfate or sodium peroxydisulfate.
5. a kind of preparation method of composite bentonite desiccant according to claim 1, it is characterised in that：Step（4）Institute
State aluminium chloride mixed solution be will be by aluminium chloride and water in mass ratio 1：10~1：18 mixing, and it is added 1~2 times of aluminium chloride quality
Glutaraldehyde and 0.2~0.4 times of aluminium chloride of calcium chloride, after being stirred, aluminium chloride mixed solution must be stated.
6. a kind of preparation method of composite bentonite desiccant according to claim 1, it is characterised in that：Step（4）Institute
Stating graphene oxide solution is by graphene oxide and water in mass ratio 1：100~1：200 mixing, ultrasonic disperse obtain oxidation stone
Black alkene solution.
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