CN104788619B - A kind of star-like netted organic-inorganic composite super strength water absorbent and preparation method thereof - Google Patents
A kind of star-like netted organic-inorganic composite super strength water absorbent and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of star-like netted organic-inorganic composite super strength water absorbent and preparation method thereof, belong to field of new materials.The parts by weight of the water absorbing agent form：The parts by weight of the water absorbing agent form：30 50 parts of superfine silica sols or nano silicon, 10 20 parts of nano titanium oxides, 40 100 parts of hydroxypropyl methyl celluloses, 20 30 parts of N N-isopropylacrylamides, 0.02 0.3 parts of crosslinking agents and 0.4 1.2 parts of initiators；The solid content of superfine silica sol is 10 30wt%, and wherein the particle diameter of silica is 1 100nm.The super strength water absorbent that the present invention is prepared can match completion under normal temperature state, other warming-up devices need not be increased, it, which has, stablizes excellent water-absorbing-retaining performance, there is good salt tolerance again, the defending and controlling sand of arid/semiarid zone can be widely used in, agricultural planting crops, forestry are grown saplings, animal husbandry plantation meadow etc..
Description
Technical field
The present invention relates to a kind of soil, desert water-loss reducer, and in particular to a kind of organic-nothing with star-like network structure
Machine composite type ultrastrong water-absorption agent and preparation method thereof, belongs to field of new materials.
Background technology
China is one of country that water resource lacks in the world, and Arid＆semi-arid area area accounts for territory total area
47%, wherein China have 45% territory be in annual precipitation be less than 400mm arid Shao Shui areas, annual irrigation water it is short
Lack also above 3,000,000,000 m3, even in the more area of Precipitation of South China, there is also seasonal and regional water shortage.Drought and water shortage is
An important factor for restricting China's agricultural sustainable development, with global warming, arid aggravation, dry areas is also constantly expanding
Greatly.Therefore, Inner Mongol Dryland soil drought-resistant water-preserving ability how is improved, improves WUEL, alleviates arid to crop
Extent of injury, be current key subjects urgently to be resolved hurrily to ensure that Stabilizing Grain Output increases production.
Chemical water-saving technology be using chemical material or preparation by directly act on plant or indirectly-acting in soil come
Improve the water consumption characteristic of plant, and then improve efficiency of water application.At present, water-loss reducer, soil-solidified-agent etc. are a collection of new, more
Function water saving material is applied in agricultural and obtains good result.
Water-loss reducer is due to taking precautions against drought, drought resisting, water saving, improving fertilizer efficiency, improved soil, many effects such as volume increase,
The extensive use in various countries' agricultural production.Water-keeping material common in China's agricultural production has polyacrylate, poly- third at present
Dilute acid amides, humic acid, bentonite etc., wherein high hydroscopic resin (SAP) are a kind of new functional macromolecule materials, and it, which has, absorbs
High water absorption function than itself weight hundreds of to thousands of times of water, and water retention property is excellent, when water swelling turns into hydrogel,
Even if pressurization also is difficult to water to separate.High hydroscopic resin can reduce infiltration and the evaporation loss of soil moisture, extend and plant
Thing reaches the time of wilted point, reduces irrigation frequency, improves the utilization ratio of water resource.When arid occurs, high hydroscopic resin meeting
The moisture inside it is slowly discharged with the growth of plant moisture evapotranspiration, for plant normal growth, and with repeatedly
Absorbent function, it is a kind of effective water-loss reducer.
CN104263376A discloses a kind of new soil compound water retaining agent, and the compound water retaining agent includes modified shell
Glycan, modified marine alga, acrylamide, NVP, N, N '-methylene-bisacrylamide, 2- 2-hydroxy-4-methylthios
Butyramide, ammonium persulfate, composite assistant, fermentation fertilizer, montmorillonite, sodium carboxymethylcellulose, nanometer additive, calcium aluminate powder and
Sodium humate, wherein modification of chitosan are configured to 5-8wt% solution by weighing soluble chitosan addition distilled water, add
Enteromorpha powder, stirring are warming up to 50-60 DEG C and mix 5-10min, then add isopropyl titanate, and it is anti-to be warming up to 70-80 DEG C of stirring
20-25min is answered to obtain.By the suitable collocation of component, the optimum choice of processing step, water retention property has obtained effective lifting.
CN1912006A discloses a kind of humic acid base superstrength water retaining agent and preparation method thereof, its contain coal humic acid,
Acrylic acid, industrial starch, crosslinking agent, NaOH solution and potassium peroxydisulfate.Extracted using the higher coal of humic acid content as raw material rotten
Phytic acid, humic acid and highly basic are reacted, formed humate solution and with hydrophilic monomer and starch graft copolymer, keep water-bath
Temperature 60 C is effectively improved to viscous gel shape product, water retention property is formed.
CN102558618A discloses a kind of substrate water retaining agent, including additive and adhesive, and wherein additive selection can
One or more in soluble starch, bamboo charcoal powder, corncob pyrolysis powder, adhesive selection cyclodextrin and sodium carboxymethylcellulose.
The substrate water retaining agent of the invention is prepared by natural material, and water absorption and swelling degree reaches 145-188%, and water-setting is expanded to after water suction
Glue, strengthen matrix water-retaining property, can slowly discharge moisture and be utilized for plant absorption, the water conservation time is grown, and effect is good.
CN102585835A discloses water-loss reducer of soil made of a kind of carbonizing production using agricultural crop straw, by farming
The biological black wood charcoal that thing straw charring obtains, 60 mesh sieves are crossed, add water, be well mixed, add PAM, be well mixed, being dried to moisture content is
10%-30% takes out, and is cut into each about 0.3-0.5cm of length and width fragment, then dries to constant weight, that is, obtain water-loss reducer.The invention
Water-loss reducer it is cheap, water retention property is stable.
In the prior art, using high molecular polymer water absorbing agent, degradation time length, and imbibition less stable be present, it is difficult
To obtain the higher product of combination property, especially salt tolerance cannot be guaranteed, largely limit superabsorbent
Application.
The content of the invention
The purpose of the present invention is to be directed to technical problem present in prior art, there is provided a kind of water-absorbing-retaining performance is strong, resistance to
The good environmentally friendly organic-inorganic compoiste super strength water absorbent of salt, inorganic matter carry substantial amounts of active group, and with unique sky
Between structure, by itself and synthetic organic polymers matrix compound tense, can not only improve superabsorbent water absorbing and retaining properties,
Salt tolerance, heat endurance and reusing, and the production cost of superabsorbent can be reduced, solve water-retaining property
Can unstable and salt tolerance difference the problems such as.
To achieve the above object, the present invention takes following technical scheme：
A kind of star-like netted organic-inorganic compoiste super strength water absorbent, its raw material composition are following (parts by weight)：
Wherein, described superfine silica sol is the parent of nano silicon, and its preparation method is：Sodium metasilicate is diluted molten
Yu Shuihou, ultrasonic vibration 10-20min are well mixed, and form the water glass solution that concentration is 5wt%-40wt%；By highly acid sun
Ion exchange resin and strong-base anion-exchange resin by volume 1:2~1:3 are mixed to get compound resin；Waterglass is molten
Liquid is with compound exchanger resin by weight 20：1~40：1 is thoroughly mixed, and removes impurity, the silicate solution pre-processed；
Aqueous slkali is added into amount of activated silicate solution, regulation pH value is that 70-85 DEG C of 9-10, normal press control heating response 1-3 are small
When after particle diameter be Ludox mother liquor；Ludox mother liquor carries out dehydration point, concentrates and purify, and it is 10- that concentration, which is prepared,
30wt% Ludox, wherein silica particle diameter is between 1-100nm.Preferably, parts by weight shared by the superfine silica sol
Number is 35-40, more preferably 35；Thickness of silica gel is 20wt%.In the present invention, superfine silica sol can be replaced particle diameter and be
1-100nm nano silicon.
Preferably, parts by weight shared by hydroxypropyl methyl cellulose are 70-90, more preferably 75.
Preferably, nano titanium oxide particle diameter is 5-50nm, and shared weight fraction is 15.
Preferably, the crosslinking agent is N, N- methylene-bisacrylamides.
Preferably, the initiator is potassium peroxydisulfate and anhydrous sodium sulfite, and the two mass ratio is 1：1.
It is a further object of the present invention to provide the preparation side of above-mentioned star-like netted organic-inorganic compoiste super strength water absorbent
Method.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
A kind of preparation method of star-like netted organic-inorganic compoiste super strength water absorbent, comprises the following steps：
(1) by following composition (parts by weight) stock：
(2) superfine silica sol is prepared：After sodium metasilicate dilution is dissolved in into water, ultrasonic vibration 10-20min is well mixed, and is formed
Concentration is 5wt%-40wt% water glass solution；Storng-acid cation exchange resin and strong-base anion-exchange resin are pressed
Volume ratio 1:2~1:3 are mixed to get compound resin；By water glass solution and compound exchanger resin by weight 20：1~40：1 fills
Divide and be stirred, remove impurity, the silicate solution pre-processed；Aqueous slkali is added into amount of activated silicate solution, is adjusted
It is Ludox mother liquor that pH value, which is 9-10, particle diameter is obtained after 70-85 DEG C of heating response 1-3 hour of normal press control；Ludox mother liquor enters
Row dehydration point, concentrate and purify, the Ludox that concentration is 10-30wt% is prepared, wherein silica particle diameter is in 1-100nm
Between.
(2) under normal temperature, hydroxypropyl methyl cellulose is added into deionized water, stirred under nitrogen protection to being completely dissolved；
(3) superfine silica sol solution and nano titanium oxide are sequentially added, forms sol liquid；
(4) and then NIPA monomer is added, under nitrogen atmosphere, temperature is heated to 20-50 DEG C, and stirring is molten
Solution, about 5-30min；
(5) when temperature is constant, after pH value is adjusted into 8-11 with sodium hydroxide aqueous slkali, initiator persulfuric acid is sequentially added
The aqueous solution of potassium and anhydrous sodium sulfite, crosslinking agent N, the aqueous solution of N- methylene-bisacrylamides, accelerate stirring, make its crosslinking
Polymerization, fully react, after insulation reaction 3h-11h, be cooled to room temperature, obtain organic-inorganic compoiste polymer gel；
(6) gel is configured to the aqueous solution that concentration is 2wt%-10wt%, precipitation separation is carried out to polymer with acetone
Afterwards, it is dried in vacuum drying chamber, drying temperature is 50-80 DEG C, obtains product.
Described superfine silica sol is the parent of nano silicon, and its preparation method is：Sodium metasilicate dilution is dissolved in water
Afterwards, ultrasonic vibration 10-20min is well mixed, and forms the water glass solution that concentration is 5wt%-40wt%；By highly acidic cation
Exchanger resin and strong-base anion-exchange resin by volume 1:2~1:3 are mixed to get compound exchanger resin；Waterglass is molten
Liquid is with compound exchanger resin by weight 20:1~40:1 is thoroughly mixed, and removes impurity, the silicate solution pre-processed；
Aqueous slkali is added into silicate solution, regulation pH value is 9-10, silicon is obtained after 70-85 DEG C of heating response 1-3 hour of normal press control
Colloidal sol mother liquor；Ludox mother liquor carries out dehydration point, concentrates and purify, and the Ludox that concentration is 10-30wt% is prepared, wherein
Silica particle diameter is between 1-100nm.
Preferably, it is characterised in that：The superfine silica sol replaces with nano silicon.
Preferably, parts by weight shared by the superfine silica sol or nano silicon are 35-40, more preferably
35, thickness of silica gel 20%.
Preferably, parts by weight shared by hydroxypropyl methyl cellulose are 70-90, more preferably 75.
The performance indications for the super strength water absorbent being prepared are as follows：
1.00g/m2<Density<1.10g/m2；Viscosity>800mP.S；6<PH value<8；Maximum Water absorption：680 times；Year degraded
Rate 10wt%-15wt%.Contrast and find through Electronic Speculum, nano-inorganic substance has been successfully entered in cellulose, forms nuclear membrane knot
Structure.
Beneficial effect：
The characteristics of present invention is big according to nano particle specific surface area, and affinity is strong, is prepared ultra-fine hyperpure silicasol, its
In nano silicon granularity it is small, be uniformly dispersed, rich in hydroxyl, water absorbing properties are superior, using in-situ synthesis, using nanometer
SiO2Nano titanium oxide and hydroxypropyl methyl cellulose macromolecule compound action mechanism are coated, by inorganic nano-particle and fiber
Element is compound, i.e., nano-particle is incorporated on the molecule of modified cellulose, and to make to connect on a nano-particle multiple
Unmodified cellulose molecule, it is allowed to be formed one kind using nano-particle as core, unmodified cellulose molecule is netted for the star-like fibrosis of film
Structure, using cross-linked polymeric method, super absorbent resin alicyclic monomer NIPA is introduced into chain and occurs to polymerize, is crosslinked, connects
Branch, the link and combination that multiple nuclear membrane star gear transmission polymer between each other can be Jing Guo multistep, form the star-like fiber of nuclear membrane
Element/super-strong moisture absorbing network copolymer so that hydrone is easy to that areola is contacted, infiltrated through with netted chain, forms gelling material and stores
Store away, the degree of cross linking between polymer molecule can form network structure, while it is intermolecular various ionic groups be present, can produce compared with
Strong water affinity, moisture can be firmly pinned, is rigidly fastened within network structure, formation can slowly discharge moisture
Gelling material.Polymer mesh performance is more firm, and water retention property is higher.Through experiment, super strength water absorbent of the invention is pressurizeing
In 2KPa deionized water repeatedly after water suction-drying-water suction 20 times, water absorbent rate remains at more than 500 (g/g).
Due to the introducing of nano-inorganic substance, the hydroxyl that nano silicon and titanium dioxide can be rich in by surface passes through thing
Reason absorption and chemisorbed large quantity of moisture, not only increase water-absorbing-retaining performance and repeat water absorbing properties, further improve high score
The performance of sub- water-absorbing resin salt tolerance difference, the use range and stability of water-absorbing water-retaining agent.Through experiment, super-strong moisture absorbing of the invention
Agent water absorbent rate in the salt solution that pressurization 1KPa mass fractions are 0.9%, is 198 (g/g), significantly improves salt tolerance, solve
The problem of salt tolerance difference of high hydroscopic resin such as polyacrylamide, the salt-soda soil available for the Northwest.
Super strength water absorbent of the present invention can match completion under normal temperature state, without increasing other warming-up devices.It has
Stablize excellent water-absorbing-retaining performance, there is good salt tolerance again, be mainly used in defending and controlling sand, agricultural planting crops, forestry
Grow saplings, the water-absorbing-retaining on animal husbandry plantation meadow etc..The top layer of sandy soil is sprayed on after the completion of being matched at normal temperatures, can be
Surface forms one and continues water conservation layer, and adequate water is provided in arid/semiarid zone, and will not cause environmental pollution, has
Huge economic benefit and the social benefit of environmental protection.
Below by specific embodiment, the present invention will be further described, but is not meant to the scope of the present invention
Limitation.
Brief description of the drawings
Fig. 1-(a) and Fig. 1-(b) is respectively cellulose modified forward and backward contrast electron microscope.
Fig. 2 is the lab diagram of Water absorption and water suction number that the present invention prepares super strength water absorbent.
Embodiment
Embodiment 1
Prepare superfine silica sol：After sodium metasilicate dilution is dissolved in into water, ultrasonic vibration 20min is well mixed, and is formed concentration and is
30wt% water glass solution；By storng-acid cation exchange resin and strong-base anion-exchange resin by volume 1:2 is mixed
Conjunction obtains compound resin；By water glass solution and compound exchanger resin by weight 20:1 is thoroughly mixed, and removes impurity, obtains
To the silicate solution of pretreatment；Aqueous slkali is added into silicate solution, regulation pH value is that 9.5, normal press control, 70 DEG C of heating are anti-
Ludox mother liquor is obtained after answering 2 hours；Ludox mother liquor carries out dehydration point, concentrates and purify, and it is 20wt%'s that concentration, which is prepared,
Ludox, wherein silica particle diameter is between 1-100nm.
Under normal temperature, 4g hydroxypropyl methyl celluloses are added into deionized water, stirred under nitrogen protection to being completely dissolved, according to
Secondary addition 3g concentration is 20wt% superfine silica sols solution and 1g nano titanium oxides, forms sol liquid；Then 3gN- is added
N-isopropylacrylamide monomer, under nitrogen atmosphere, temperature are heated to 30 DEG C, stirring and dissolving about 25min；With NaOH solution by pH
Value is adjusted to 9, sequentially adds the aqueous solution, crosslinking agent containing the 0.03g N, N- of potassium peroxydisulfate containing 0.04g and 0.04g anhydrous sodium sulfites
The aqueous solution of methylene-bisacrylamide, accelerate to stir, after insulation reaction 3h, be cooled to room temperature, obtain gel；Gel is prepared
Into the aqueous solution that concentration is 5wt%, after carrying out precipitation separation to polymer with acetone, it is dried, does in vacuum drying chamber
Dry temperature 60 C, obtain super strength water absorbent of the present invention.
As shown in Fig. 2 the lab diagram of the Water absorption and water suction number of super strength water absorbent is prepared for the present embodiment.
Embodiment 2
Prepare superfine silica sol：After sodium metasilicate dilution is dissolved in into water, ultrasonic vibration 10min is well mixed, and is formed concentration and is
25wt% water glass solution；By storng-acid cation exchange resin and strong-base anion-exchange resin by volume 1:3 is mixed
Conjunction obtains compound resin；By water glass solution and compound exchanger resin by weight 40:1 is thoroughly mixed, and removes impurity, obtains
To the silicate solution of pretreatment；Aqueous slkali is added into silicate solution, regulation pH value is 9,85 DEG C of heating responses 1 of normal press control
Ludox mother liquor is obtained after hour；Ludox mother liquor carries out dehydration point, concentrates and purify, and it is molten that the silicon that concentration is 20wt% is prepared
Glue, wherein silica particle diameter is between 1-100nm.
Under normal temperature, 3g hydroxypropyl methyl celluloses are added into deionized water, stirred under nitrogen protection to being completely dissolved, according to
Secondary addition 1.5g concentration is 20wt% superfine silica sols solution and 1g nano titanium oxides, forms sol liquid；Then add
2gN- N-isopropylacrylamide monomers, under nitrogen atmosphere, temperature are heated to 40 DEG C, stirring and dissolving about 25min；Use NaOH solution
PH value is adjusted to 8.5, the aqueous solution of potassium peroxydisulfate containing 0.05g and 0.05g anhydrous sodium sulfites is sequentially added, is crosslinked containing 0.01g
The aqueous solution of agent N, N- methylene-bisacrylamide, accelerate to stir, after insulation reaction 3.5h, be cooled to room temperature, obtain gel；Will
Gel is configured to the aqueous solution that concentration is 5wt%, after carrying out precipitation separation to polymer with acetone, is carried out in vacuum drying chamber
Dry, 60 DEG C of drying temperature, obtain super strength water absorbent of the present invention.
Embodiment 3
Prepare superfine silica sol：After sodium metasilicate dilution is dissolved in into water, ultrasonic vibration 15min is well mixed, and is formed concentration and is
5wt% water glass solution；By storng-acid cation exchange resin and strong-base anion-exchange resin by volume 1:It is 2.5 mixed
Conjunction obtains compound resin；By water glass solution and compound exchanger resin by weight 30:1 is thoroughly mixed, and removes impurity, obtains
To the silicate solution of pretreatment；Aqueous slkali is added into silicate solution, regulation pH value is 10,80 DEG C of heating responses of normal press control
Ludox mother liquor is obtained after 3 hours；Ludox mother liquor carries out dehydration point, concentrates and purify, and the silicon that concentration is 20wt% is prepared
Colloidal sol, wherein silica particle diameter is between 1-100nm.
Under normal temperature, 10g hydroxypropyl methyl celluloses are added into deionized water, stirred under nitrogen protection to being completely dissolved,
It is 20wt% superfine silica sols solution and 2g nano titanium oxides to sequentially add 4g concentration, forms sol liquid；Then add
6gN- N-isopropylacrylamide monomers, under nitrogen atmosphere, temperature are heated to 30 DEG C, stirring and dissolving about 30min；Use NaOH solution
PH value is adjusted to 9.5, sequentially adds the aqueous solution of potassium peroxydisulfate containing 0.05g and 0.05g anhydrous sodium sulfites, crosslinking agent containing 1.6g
The aqueous solution of N, N- methylene-bisacrylamide, accelerate to stir, after insulation reaction 3h, be cooled to room temperature, obtain gel；By gel
The aqueous solution that concentration is 5wt% is configured to, after carrying out precipitation separation to polymer with acetone, is done in vacuum drying chamber
It is dry, 60 DEG C of drying temperature, obtain super strength water absorbent of the present invention.
The star-like netted organic-inorganic compoiste super strength water absorbent that the present invention is prepared, can match somebody with somebody under normal temperature state
Than completing, without increasing other warming-up devices, it, which has, stablizes excellent water-absorbing-retaining performance, has good salt tolerance again,
The the defending and controlling sand of arid/semiarid zone can be widely used in, agricultural planting crops, forestry are grown saplings, animal husbandry plantation meadow etc..
Claims (5)
1. a kind of star-like netted organic-inorganic compoiste super strength water absorbent, its raw material composition are as follows by weight：
Wherein, the superfine silica sol is the parent of nano silicon, and its preparation method is：Sodium metasilicate dilution is dissolved in water
Afterwards, ultrasonic vibration 10-20min is well mixed, and forms water glass solution；By storng-acid cation exchange resin and strong basicity the moon from
Sub-exchange resin by volume 1:2~1:3 are mixed to get compound resin；By water glass solution and compound exchanger resin by weight
20:1~40:1 is thoroughly mixed, and removes impurity, the silicate solution pre-processed；Added into amount of activated silicate solution
Aqueous slkali, regulation pH value be 9-10, after 70-85 DEG C of heating response 1-3 hour of normal press control particle diameter be Ludox mother liquor；Silicon
Colloidal sol mother liquor carries out dehydration point, concentrates and purify, and the Ludox that concentration is 20wt% is prepared, and wherein silica particle diameter exists
Between 1-100nm；
The crosslinking agent is N, N- methylene-bisacrylamides；The initiator is potassium peroxydisulfate and anhydrous sodium sulfite, the two
Mass ratio is 1：1.
2. star-like netted organic-inorganic compoiste super strength water absorbent according to claim 1, it is characterised in that：Hydroxypropyl
Parts by weight shared by methylcellulose are 70-90.
3. star-like netted organic-inorganic compoiste super strength water absorbent according to claim 1, it is characterised in that nano-silica
It is 5-50nm to change titanium particle diameter, and shared weight fraction is 15.
4. a kind of preparation method of star-like netted organic-inorganic compoiste super strength water absorbent as claimed in claim 1, including such as
Lower step：
(1) composition and proportioning are stocked up as described in claim 1；
(2) superfine silica sol is prepared：After sodium metasilicate dilution is dissolved in into water, ultrasonic vibration 10-20min is well mixed, and forms water glass
Glass solution；By storng-acid cation exchange resin and strong-base anion-exchange resin by volume 1:2~1:3 are mixed to get again
Resin；By water glass solution and compound exchanger resin by weight 20:1~40:1 is thoroughly mixed, and removes impurity, obtains
The silicate solution of pretreatment；Aqueous slkali is added into amount of activated silicate solution, regulation pH value is 9-10, normal press control 70-
It is Ludox mother liquor that particle diameter is obtained after 85 DEG C of heating response 1-3 hours；Ludox mother liquor carries out dehydration point, concentrates and purify, and prepares
The Ludox that concentration is 10-30wt% is obtained, wherein silica particle diameter is between 1-100nm；
(3) under normal temperature, hydroxypropyl methyl cellulose is added into deionized water, stirred under nitrogen protection to being completely dissolved；
(4) superfine silica sol solution and nano titanium oxide are sequentially added, forms sol liquid；
(5) and then NIPA monomer is added, under nitrogen atmosphere, temperature is heated to 20-50 DEG C, stirring and dissolving 5-
30min；
(6) when temperature is constant, after pH value is adjusted into 8-11 with sodium hydroxide aqueous slkali, sequentially add initiator potassium persulfate and
The anhydrous sodium sulfite aqueous solution, crosslinking agent N, N- the methylene-bisacrylamide aqueous solution, accelerate stirring, make its cross-linked polymeric abundant
React, after insulation reaction 3h-11h, be cooled to room temperature, obtain organic-inorganic compoiste polymer gel；
(7) gel is configured to the aqueous solution that concentration is 2%-10%, after carrying out precipitation separation to polymer with acetone, in vacuum
It is dried in drying box, 50-80 DEG C of drying temperature, obtains product.
5. the preparation method of star-like netted organic-inorganic compoiste super strength water absorbent according to claim 4, its feature exist
In：Parts by weight shared by the superfine silica sol are 35, thickness of silica gel 20wt%；Shared by the hydroxypropyl methyl cellulose
Parts by weight are 75.
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| CN115119678A (en) * | 2022-06-27 | 2022-09-30 | 榆林市林业科学研究所 | Pinus sylvestris forestation method |
| CN115490455B (en) * | 2022-10-09 | 2023-08-18 | 临沂海螺新材料科技有限公司 | Low-doping-amount enhanced cement grinding aid and preparation method thereof |
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Address after: Room 232, 2 / F, building 1, yard 66, Jiaoda East Road, Haidian District, Beijing 100044 Patentee after: Beijing lvfan Yineng Environmental Protection Engineering Co., Ltd Address before: 100044, Beijing, Haidian District Jiaotong University Road, No. 66, No. 1 building on the ground floor commercial use room 247 Patentee before: Beijing Xinda Hongying Environmental Protection Engineering Co.,Ltd. |
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Granted publication date: 20180109 Termination date: 20210413 |