CN105544294A - Preparation method of biologically modified wet strength agent - Google Patents
Preparation method of biologically modified wet strength agent Download PDFInfo
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- CN105544294A CN105544294A CN201510877187.8A CN201510877187A CN105544294A CN 105544294 A CN105544294 A CN 105544294A CN 201510877187 A CN201510877187 A CN 201510877187A CN 105544294 A CN105544294 A CN 105544294A
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- wet strength
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- coral reef
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/48—Polymers modified by chemical after-treatment
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyamides (AREA)
Abstract
The invention discloses a preparation method of a biologically modified wet strength agent, and belongs to the field of wet strength agents. The preparation method comprises the following steps: preparing coral reef particles from coral reef and polyamide-poly(epoxy chloropropane) resin; fermenting coral reef particles to obtain fermentation broth; carrying out separation, extraction, concentration, and drying to obtain biologically modified powder, reacting the biologically modified powder with sodium dodecyl benzene sulfonate and oxalic acid to obtain a prepolymer polyamide solution, and finally reacting the prepolymer polyamide solution with epoxy chloropropane to obtain the biologically modified wet strength agent. The added polyamide-poly(epoxy chloropropane) resin is taken as the wetting component, has a good wet strengthening effect, is little pollutant to the environment, and is nontoxic and harmless. A bioactive substance, which can be separated from the fermentation product of coral reef, is added into the wet strength agent. The provided wet strength agent can improve the wet strength degree of paper, at the same time, the softness and absorbing performance of paper are not degraded; the problem that the paper becomes moldy due to water in the paper is solved; and the strength of the paper is 30 to 50% of original dry strength, after the wet strength agent is added.
Description
Technical field
The invention discloses a kind of preparation method of bio-modification wet strength agent, belong to wet strength agent field.
Background technology
The wet strength of paper refers to that page meets water or intensity had in a humid environment.Many paper products especially industrial paper all require higher wet strength, can improve the adding of wet strength agent the wet strength of paper in the situation such as wetting.Under normal conditions, when not adding auxiliary agent paper wetted after its intensity when being only drying intensity 5 ~ 10%, paper can be made after adding wet strength agent mostly to keep the intensity of original dry strength 20 ~ 40%.Wet strengthening agents for papermaking can be divided into permanent type and temporary pattern two class, temporary pattern wet strengthening agents for papermaking be used for those in short-term, with in rear discarded paper products; Permanent type wet strengthening agents for papermaking is generally used in corrugated board and some special paper usings, and conventional has Lauxite (UF), modified melamine-formaldehyde resin (MF), Polyamide-Polyamsne-Epichlorohydrin resin (PPE or PAE) and acrylamide copolymer etc.The consumption of paper is a big chunk that account for daily necessities, and the huge papermaking output of paper industry is also for paper chemicals industry brings the corresponding good market space.In China's paper industry raw material, due to timber resource shortage, a large amount of paper making raw material mainly straw pulp, secondary stock used at present, these raw materials, due to shortcomings such as fiber are short, heteroproteose cell content is high, water retention value is high, have a strong impact on the intensity of paper and cardboard.
Along with the development of paper-making industry, traditional wet strength agent for papermaking is as Lauxite (UF), and melamine resin (MF) etc., due to reasons such as service condition and release harmful substances, more and more can not meet the demand of user.Polyamide polyamine epichlorhydrin resin (PAE) is a kind of wet strength agent comparatively popular in recent years, it not only have better wet potent fruit and also environmental pollution little, nonhazardous effect, therefore the welcome of users is received, with UF resin, MF resin-phase ratio, it is not only the high-efficiency wet reinforcing agent of slaking under neutral and alkali condition, and does not lose into flexibility, the absorbability of paper while improving wet strength, is specially adapted to health care paper using.
Summary of the invention
The technical problem that the present invention mainly solves: for wet strength agent for papermaking traditional at present as Lauxite (UF), melamine resin (MF) can discharge harmful substance under conditions of use, and it is poly-with wadding to be applied in easy generation bubble in papermaking, paper is become to take off paper difficulty, the page uniformity is poor, containing the problem that moisture easily mildews, provide a kind of preparation method of bio-modification wet strength agent, the present invention's coral reef and polyamide Hydrin resin are that raw material obtains coral reef particle, carry out the zymotic fluid that ferments to obtain, be separated, extraction, concentrated, bio-modification powder is obtained after drying, modification performed polymer polyamide solution is reacted to obtain again with neopelex and ethanedioic acid, bio-modification wet strength agent is obtained with epichlorohydrin reaction is final, the present invention adds polyamide polyamine epichlorhydrin resin moisturizing ingredient, not only have better wet potent fruit and also environmental pollution little, nonhazardous effect, can be separated from coral reef tunning and obtain one and there is bioactivator be added on wherein, the flexibility of paper is not lost into while making raising wet strength, absorbability, prevent paper because the problem easily mildewed containing moisture, paper can be made after adding wet strength agent to soak the intensity of the original dry strength 30 ~ 50% of rear maintenance.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
(1) 800 ~ 900g coral reef is got, put into pulverizer to pulverize, cross 20 ~ 50 mesh standard sieves, obtain coral reef powder, the powder of gained is put into container, add the sodium chloride solution immersion particle that mass fraction is 3 ~ 4% wherein, and then add 50 ~ 60mL polyamide Hydrin resin wherein, stir, subsequently 35 ~ 40 DEG C are heated to container, keep temperature 5 ~ 10h;
(2) after above-mentioned insulation terminates, under the pressure of 90 ~ 110Pa, carry out filtration under diminished pressure, collect filtrate, coral reef particle must be screened, the screening coral reef particle of gained is put into fermentation tank, inoculum concentration is 15 ~ 30%, and then add nutrients wherein, addition is 20 ~ 30% of screening coral reef granular mass, mix, fermentation jar temperature is kept to be 28 ~ 35 DEG C subsequently, throughput is 0.4 ~ 0.6(V/Vmin), speed setting is 110 ~ 130r/min, ferment 10 ~ 15 days, described nutrients is by quality hundred parts of ratios, get 40 ~ 50 portions of potatos, 20 ~ 30 parts of glucose and 25 ~ 35 parts of peptones, mix,
(3) filter after above-mentioned fermentation ends, collect zymotic fluid, the zymotic fluid of gained is put into centrifuge, under the rotating speed of 5000 ~ 6000r/min, centrifugation 1 ~ 3min, collects supernatant, then the supernatant of gained is put into container, the isopyknic ethyl acetate of supernatant is used to carry out extraction 2 ~ 4 times to supernatant, combining extraction liquid subsequently;
(4) extract of above-mentioned gained is carried out reduced pressure concentration under vacuo, be concentrated into 30 ~ 50% of original volume, then the concentrate of gained is carried out spraying dry, collect dry thing, bio-modification powder can be obtained;
(5) 5:6:1 in mass ratio, get the bio-modification powder of diethylenetriamine, adipic acid and above-mentioned gained, put into reactor, when being warming up to 50 ~ 60 DEG C, stirring 40 ~ 50min, then add neopelex wherein, addition is 1 ~ 2% of ethanedioic acid quality, continue to be warming up to 110 ~ 120 DEG C, after stirring 3 ~ 5h, discharging obtains modification performed polymer polyamide solution;
(6) 1:1 by volume, by the modification performed polymer polyamide solution of above-mentioned gained and epoxychloropropane, mixes, put into container, be warming up to 70 ~ 90 DEG C, after reaction 3 ~ 5h, service property (quality) mark is the hydrochloric acid solution of 60%, pH is regulated to be 2 ~ 3, then be cooled to room temperature, add the bio-modification powder of epoxychloropropane quality 20 ~ 25% wherein, mix, after still aging 1 ~ 2h, bio-modification wet strength agent can be obtained.
Application process of the present invention: the bio-modification wet strength agent that the present invention obtains, when papermaking by oven dry stock be 0.2 ~ 0.5% add, add pond with slurry after being diluted 6 ~ 10 times again and stir, to Large Paper Machine, addition point selects the dilution at header box place to add usually, and paper can be made after adding wet strength agent to soak the intensity of the original dry strength 30 ~ 50% of rear maintenance; Wet strength agent of the present invention can be use in 5 ~ 9 scopes at wider PH, and goes for wood pulp, bamboo pulp, waste paper regenerated slurry, Straw Pulp, reed pulp, cotton stalk pulp etc.
The invention has the beneficial effects as follows:
(1) the present invention adds polyamide polyamine epichlorhydrin resin moisturizing ingredient, not only have better wet potent fruit and also environmental pollution little, nonhazardous effect;
(2) can be separated from coral reef tunning and obtain one and there is bioactivator be added on wherein, while making raising wet strength, not lose into the flexibility of paper, absorbability.
Detailed description of the invention
First 800 ~ 900g coral reef is got, put into pulverizer to pulverize, cross 20 ~ 50 mesh standard sieves, obtain coral reef powder, the powder of gained is put into container, add the sodium chloride solution immersion particle that mass fraction is 3 ~ 4% wherein, and then add 50 ~ 60mL polyamide Hydrin resin wherein, stir, subsequently 35 ~ 40 DEG C are heated to container, keep temperature 5 ~ 10h, after insulation terminates, under the pressure of 90 ~ 110Pa, carry out filtration under diminished pressure, collect filtrate, coral reef particle must be screened, the screening coral reef particle of gained is put into fermentation tank, inoculum concentration is 15 ~ 30%, and then add nutrients wherein, addition is 20 ~ 30% of screening coral reef granular mass, mix, fermentation jar temperature is kept to be 28 ~ 35 DEG C subsequently, throughput is 0.4 ~ 0.6(V/Vmin), speed setting is 110 ~ 130r/min, ferment 10 ~ 15 days, described nutrients is by quality hundred parts of ratios, get 40 ~ 50 portions of potatos, 20 ~ 30 parts of glucose and 25 ~ 35 parts of peptones, mix, filter after fermentation ends, collect zymotic fluid, the zymotic fluid of gained is put into centrifuge, under the rotating speed of 5000 ~ 6000r/min, centrifugation 1 ~ 3min, collects supernatant, then the supernatant of gained is put into container, the isopyknic ethyl acetate of supernatant is used to carry out extraction 2 ~ 4 times to supernatant, combining extraction liquid subsequently, the extract of gained is carried out reduced pressure concentration under vacuo, is concentrated into 30 ~ 50% of original volume, then the concentrate of gained is carried out spraying dry, collect dry thing, bio-modification powder can be obtained, 5:6:1 in mass ratio, get the bio-modification powder of diethylenetriamine, adipic acid and above-mentioned gained, put into reactor, when being warming up to 50 ~ 60 DEG C, stirring 40 ~ 50min, then add neopelex wherein, addition is 1 ~ 2% of ethanedioic acid quality, continue to be warming up to 110 ~ 120 DEG C, after stirring 3 ~ 5h, discharging obtains modification performed polymer polyamide solution, 1:1 by volume, by the modification performed polymer polyamide solution of above-mentioned gained and epoxychloropropane, mixes, put into container, be warming up to 70 ~ 90 DEG C, after reaction 3 ~ 5h, service property (quality) mark is the hydrochloric acid solution of 60%, pH is regulated to be 2 ~ 3, then be cooled to room temperature, add the bio-modification powder of epoxychloropropane quality 20 ~ 25% wherein, mix, after still aging 1 ~ 2h, bio-modification wet strength agent can be obtained.
Example 1
First 800g coral reef is got, put into pulverizer to pulverize, cross 20 mesh standard sieves, obtain coral reef powder, the powder of gained is put into container, add the sodium chloride solution immersion particle that mass fraction is 3% wherein, and then add 50mL polyamide Hydrin resin wherein, stir, subsequently 35 DEG C are heated to container, keep temperature 5h; After insulation terminates, under the pressure of 90Pa, carry out filtration under diminished pressure, collect filtrate, must screen coral reef particle, the screening coral reef particle of gained is put into fermentation tank, and inoculum concentration is 15%, and then add nutrients wherein, addition is 20% of screening coral reef granular mass, mixes, keeps fermentation jar temperature to be 28 DEG C subsequently, throughput is 0.4(V/Vmin), speed setting is 110r/min, ferments 10 days, and described nutrients is by quality hundred parts of ratios, get 40 portions of potatos, 30 parts of glucose and 30 parts of peptones, mix; Filter after fermentation ends, collect zymotic fluid, the zymotic fluid of gained is put into centrifuge, under the rotating speed of 5000r/min, centrifugation 1min, collects supernatant, then the supernatant of gained is put into container, the isopyknic ethyl acetate of supernatant is used to carry out extraction 2 times to supernatant, combining extraction liquid subsequently; The extract of gained is carried out reduced pressure concentration under vacuo, is concentrated into 30% of original volume, then the concentrate of gained is carried out spraying dry, collect dry thing, bio-modification powder can be obtained; 5:6:1 in mass ratio, get the bio-modification powder of diethylenetriamine, adipic acid and above-mentioned gained, put into reactor, when being warming up to 50 DEG C, stirring 40min, then add neopelex wherein, addition is 1% of ethanedioic acid quality, continue to be warming up to 110 DEG C, after stirring 3h, discharging obtains modification performed polymer polyamide solution; 1:1 by volume, by the modification performed polymer polyamide solution of above-mentioned gained and epoxychloropropane, mixes, put into container, be warming up to 70 DEG C, after reaction 3h, service property (quality) mark is the hydrochloric acid solution of 60%, pH is regulated to be 2, then be cooled to room temperature, add the bio-modification powder of epoxychloropropane quality 20% wherein, mix, after still aging 1h, bio-modification wet strength agent can be obtained.
The bio-modification wet strength agent that the present invention obtains, be 0.2% interpolation when papermaking by oven dry stock, add pond with slurry after being diluted 6 times again and stir, to Large Paper Machine, addition point selects the dilution at header box place to add usually, and paper can be made after adding wet strength agent to soak the intensity of the original dry strength 30% of rear maintenance; Wet strength agent of the present invention can be use in 5 scopes at wider PH, and goes for wood pulp, bamboo pulp, waste paper regenerated slurry, Straw Pulp, reed pulp, cotton stalk pulp etc.
Example 2
First 850g coral reef is got, put into pulverizer to pulverize, cross 35 mesh standard sieves, obtain coral reef powder, the powder of gained is put into container, add the sodium chloride solution immersion particle that mass fraction is 3.5% wherein, and then add 55mL polyamide Hydrin resin wherein, stir, subsequently 38 DEG C are heated to container, keep temperature 8h; After insulation terminates, under the pressure of 100Pa, carry out filtration under diminished pressure, collect filtrate, must screen coral reef particle, the screening coral reef particle of gained is put into fermentation tank, and inoculum concentration is 17%, and then add nutrients wherein, addition is 25% of screening coral reef granular mass, mixes, keeps fermentation jar temperature to be 32 DEG C subsequently, throughput is 0.5(V/Vmin), speed setting is 120r/min, ferments 13 days, and described nutrients is by quality hundred parts of ratios, get 45 portions of potatos, 25 parts of glucose and 25 parts of peptones, mix; Filter after fermentation ends, collect zymotic fluid, the zymotic fluid of gained is put into centrifuge, under the rotating speed of 5500r/min, centrifugation 2min, collects supernatant, then the supernatant of gained is put into container, the isopyknic ethyl acetate of supernatant is used to carry out extraction 3 times to supernatant, combining extraction liquid subsequently; The extract of gained is carried out reduced pressure concentration under vacuo, is concentrated into 40% of original volume, then the concentrate of gained is carried out spraying dry, collect dry thing, bio-modification powder can be obtained; 5:6:1 in mass ratio, get the bio-modification powder of diethylenetriamine, adipic acid and above-mentioned gained, put into reactor, when being warming up to 55 DEG C, stirring 45min, then add neopelex wherein, addition is 1.5% of ethanedioic acid quality, continue to be warming up to 115 DEG C, after stirring 4h, discharging obtains modification performed polymer polyamide solution; 1:1 by volume, by the modification performed polymer polyamide solution of above-mentioned gained and epoxychloropropane, mixes, put into container, be warming up to 80 DEG C, after reaction 4h, service property (quality) mark is the hydrochloric acid solution of 60%, pH is regulated to be 2.5, then be cooled to room temperature, add the bio-modification powder of epoxychloropropane quality 23% wherein, mix, after still aging 1.5h, bio-modification wet strength agent can be obtained.
The bio-modification wet strength agent that the present invention obtains, be 0.4% interpolation when papermaking by oven dry stock, add pond with slurry after being diluted 8 times again and stir, to Large Paper Machine, addition point selects the dilution at header box place to add usually, and paper can be made after adding wet strength agent to soak the intensity of the original dry strength 40% of rear maintenance; Wet strength agent of the present invention can be use in 7 scopes at wider PH, and goes for wood pulp, bamboo pulp, waste paper regenerated slurry, Straw Pulp, reed pulp, cotton stalk pulp etc.
Example 3
First 900g coral reef is got, put into pulverizer to pulverize, cross 50 mesh standard sieves, obtain coral reef powder, the powder of gained is put into container, add the sodium chloride solution immersion particle that mass fraction is 4% wherein, and then add 60mL polyamide Hydrin resin wherein, stir, subsequently 40 DEG C are heated to container, keep temperature 10h; After insulation terminates, under the pressure of 110Pa, carry out filtration under diminished pressure, collect filtrate, must screen coral reef particle, the screening coral reef particle of gained is put into fermentation tank, and inoculum concentration is 30%, and then add nutrients wherein, addition is 30% of screening coral reef granular mass, mixes, keeps fermentation jar temperature to be 35 DEG C subsequently, throughput is 0.6(V/Vmin), speed setting is 130r/min, ferments 15 days, and described nutrients is by quality hundred parts of ratios, get 50 portions of potatos, 23 parts of glucose and 27 parts of peptones, mix; Filter after fermentation ends, collect zymotic fluid, the zymotic fluid of gained is put into centrifuge, under the rotating speed of 6000r/min, centrifugation 3min, collects supernatant, then the supernatant of gained is put into container, the isopyknic ethyl acetate of supernatant is used to carry out extraction 4 times to supernatant, combining extraction liquid subsequently; The extract of gained is carried out reduced pressure concentration under vacuo, is concentrated into 50% of original volume, then the concentrate of gained is carried out spraying dry, collect dry thing, bio-modification powder can be obtained; 5:6:1 in mass ratio, get the bio-modification powder of diethylenetriamine, adipic acid and above-mentioned gained, put into reactor, when being warming up to 60 DEG C, stirring 50min, then add neopelex wherein, addition is 2% of ethanedioic acid quality, continue to be warming up to 120 DEG C, after stirring 5h, discharging obtains modification performed polymer polyamide solution; 1:1 by volume, by the modification performed polymer polyamide solution of above-mentioned gained and epoxychloropropane, mixes, put into container, be warming up to 90 DEG C, after reaction 5h, service property (quality) mark is the hydrochloric acid solution of 60%, pH is regulated to be 3, then be cooled to room temperature, add the bio-modification powder of epoxychloropropane quality 25% wherein, mix, after still aging 2h, bio-modification wet strength agent can be obtained.
The bio-modification wet strength agent that the present invention obtains, be 0.5% interpolation when papermaking by oven dry stock, add pond with slurry after being diluted 10 times again and stir, to Large Paper Machine, addition point selects the dilution at header box place to add usually, and paper can be made after adding wet strength agent to soak the intensity of the original dry strength 50% of rear maintenance; Wet strength agent of the present invention can be use in 9 scopes at wider PH, and goes for wood pulp, bamboo pulp, waste paper regenerated slurry, Straw Pulp, reed pulp, cotton stalk pulp etc.
Claims (1)
1. a preparation method for bio-modification wet strength agent, is characterized in that concrete preparation method:
(1) 800 ~ 900g coral reef is got, put into pulverizer to pulverize, cross 20 ~ 50 mesh standard sieves, obtain coral reef powder, the powder of gained is put into container, add the sodium chloride solution immersion particle that mass fraction is 3 ~ 4% wherein, and then add 50 ~ 60mL polyamide Hydrin resin wherein, stir, subsequently 35 ~ 40 DEG C are heated to container, keep temperature 5 ~ 10h;
(2) after above-mentioned insulation terminates, under the pressure of 90 ~ 110Pa, carry out filtration under diminished pressure, collect filtrate, coral reef particle must be screened, the screening coral reef particle of gained is put into fermentation tank, inoculum concentration is 15 ~ 30%, and then add nutrients wherein, addition is 20 ~ 30% of screening coral reef granular mass, mix, fermentation jar temperature is kept to be 28 ~ 35 DEG C subsequently, throughput is 0.4 ~ 0.6(V/Vmin), speed setting is 110 ~ 130r/min, ferment 10 ~ 15 days, described nutrients is by quality hundred parts of ratios, get 40 ~ 50 portions of potatos, 20 ~ 30 parts of glucose and 25 ~ 35 parts of peptones, mix,
(3) filter after above-mentioned fermentation ends, collect zymotic fluid, the zymotic fluid of gained is put into centrifuge, under the rotating speed of 5000 ~ 6000r/min, centrifugation 1 ~ 3min, collects supernatant, then the supernatant of gained is put into container, the isopyknic ethyl acetate of supernatant is used to carry out extraction 2 ~ 4 times to supernatant, combining extraction liquid subsequently;
(4) extract of above-mentioned gained is carried out reduced pressure concentration under vacuo, be concentrated into 30 ~ 50% of original volume, then the concentrate of gained is carried out spraying dry, collect dry thing, bio-modification powder can be obtained;
(5) 5:6:1 in mass ratio, get the bio-modification powder of diethylenetriamine, adipic acid and above-mentioned gained, put into reactor, when being warming up to 50 ~ 60 DEG C, stirring 40 ~ 50min, then add neopelex wherein, addition is 1 ~ 2% of ethanedioic acid quality, continue to be warming up to 110 ~ 120 DEG C, after stirring 3 ~ 5h, discharging obtains modification performed polymer polyamide solution;
(6) 1:1 by volume, by the modification performed polymer polyamide solution of above-mentioned gained and epoxychloropropane, mixes, put into container, be warming up to 70 ~ 90 DEG C, after reaction 3 ~ 5h, service property (quality) mark is the hydrochloric acid solution of 60%, pH is regulated to be 2 ~ 3, then be cooled to room temperature, add the bio-modification powder of epoxychloropropane quality 20 ~ 25% wherein, mix, after still aging 1 ~ 2h, bio-modification wet strength agent can be obtained.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106368055A (en) * | 2016-08-31 | 2017-02-01 | 郭舒洋 | Preparation method of bio-compound papermaking wet strength agent |
| CN109355978A (en) * | 2018-10-13 | 2019-02-19 | 郑州成济堂生物科技有限公司 | A kind of preparation method of machine air filter paper |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106368055A (en) * | 2016-08-31 | 2017-02-01 | 郭舒洋 | Preparation method of bio-compound papermaking wet strength agent |
| CN109355978A (en) * | 2018-10-13 | 2019-02-19 | 郑州成济堂生物科技有限公司 | A kind of preparation method of machine air filter paper |
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Application publication date: 20160504 |