CN112090268A - High-efficiency long-acting formaldehyde scavenger and preparation method thereof - Google Patents
High-efficiency long-acting formaldehyde scavenger and preparation method thereof Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
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Abstract
The invention relates to the technical field of air purification, and particularly relates to a high-efficiency long-acting formaldehyde scavenger which comprises 0.5-1.0% of ammonium hydroxide, 0.1-1.0% of formaldehyde adsorbent, 0.1-0.5% of cellulose ether, 2-10% of composite phosphate, 2-6% of organic acid, 0.01-0.05% of mildew preventive and the balance of deionized water. The preparation method comprises the following steps: adding part of deionized water into the reaction kettle, and stirring and dissolving the rest deionized water and cellulose ether; adding composite phosphate and organic acid into a reaction kettle, and opening steam in a jacket of the reaction kettle to heat, stir and dissolve; adding the rest materials, heating, stirring, and standing. The invention solves the problems of low formaldehyde removing efficiency, low speed and easy generation of traces of the formaldehyde remover in the prior art, and the provided high-efficiency long-acting formaldehyde remover has the advantages of high formaldehyde removing efficiency, lasting effect, no corrosion to metal ornaments and no generation of white traces.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to a high-efficiency long-acting formaldehyde scavenger and a preparation method thereof.
Background
Formaldehyde is an important chemical raw material, and is widely applied to the fields of wood processing industry, plastic industry and the like due to excellent performance of formaldehyde, for example, three main types of adhesives for wood processing in China are currently used: urea-formaldehyde (UF) resin glue, phenol-formaldehyde (PF) resin glue, Melamine Formaldehyde (MF) resin glue, etc. are produced mainly from formaldehyde. With the further improvement of living standard of people, indoor decoration and furniture updating are very common. As residual formaldehyde in wood materials and furniture used for decoration is continuously released, and the cured adhesive can be cracked to release formaldehyde under certain conditions, the concentration of formaldehyde in indoor air exceeds the standard. Formaldehyde is a colorless toxic gas that can be absorbed by the respiratory tract and causes damage to the body by increasing tissue active oxygen, lipid peroxidation, affecting the immune system of the body, the action of biological macromolecules, and the like. Formaldehyde has irritation effect on skin mucosa, has sensitization effect on human body, and can cause allergic dermatitis, mottle, bronchial asthma, etc. It also has strong carcinogenicity and carcinogenesis promoting effect, and can cause nasopharyngeal carcinoma and leukemia. Formaldehyde is one of the main pollutants in indoor air, and the problem of formaldehyde pollution has attracted people's attention.
The formaldehyde scavenger is divided into two classes, one is the formaldehyde scavenger for artificial boards, and the other is the formaldehyde scavenger for purifying air. The definition of the formaldehyde scavenger for the artificial board is' a liquid product which is sprayed on the artificial board and is used for reducing the formaldehyde emission of the artificial board; the definition of formaldehyde scavenger for purifying air is' liquid product which is sprayed in the room to reduce the formaldehyde content in the indoor air. The formaldehyde scavenger is preferably purchased as a product capable of completely decomposing formaldehyde, rather than having only an absorption function. The scavenger is preferably chosen to be colorless or light-colored to avoid marking the furniture or panels after use. It must be checked whether it passes the quality test of the relevant national department when purchasing. The formaldehyde eliminating agent is preferably used at the beginning of decoration, and the effect is much better than that of the formaldehyde eliminating agent used after the decoration is finished.
At present, after finishing home decoration, the formaldehyde scavenger is generally used for eliminating the indoor formaldehyde pollution problem, but some formaldehyde scavenger products on the market at present have certain problems, such as: has corrosiveness on metal ornaments, short action time for eliminating formaldehyde, low efficiency, and easily produces white marks after spraying, thereby affecting the appearance.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a formaldehyde scavenger with high efficiency and long-term effectiveness, which is used to solve the problems of low formaldehyde scavenging efficiency, slow speed and easy generation of traces of the formaldehyde scavenger in the prior art, and also to provide a preparation method of the formaldehyde scavenger with high efficiency and long-term effectiveness. The high-efficiency long-acting formaldehyde scavenger provided by the invention has the advantages of high formaldehyde removal efficiency, lasting effect, no corrosion to metal ornaments and no generation of white marks.
In order to attain the above and other related objects,
the invention provides a high-efficiency long-acting formaldehyde scavenger, which comprises the following components in percentage by weight: 0.5 to 1.0 percent of ammonium hydroxide, 0.1 to 1.0 percent of formaldehyde adsorbent, 0.1 to 0.5 percent of cellulose ether, 2 to 10 percent of composite phosphate, 2 to 6 percent of organic acid, 0.01 to 0.05 percent of mildew preventive and the balance of deionized water.
The formaldehyde scavenger is a transparent liquid prepared by mixing and compounding ammonium hydroxide, an amide compound, a cationic water-soluble high molecular compound, high molecular cellulose ether, a dispersing agent, an organic acid, a mildew preventive and deionized water, and the formaldehyde scavenger firstly generates irreversible hexamethylenetetramine through the reaction of ammonia and formaldehyde and can efficiently remove the formaldehyde.
After the formaldehyde scavenger acts on the surface of the pollution source, a thin transparent coating can be formed, the amide compound can be adhered to the surface of the pollution source to capture formaldehyde released inside, and the formaldehyde scavenger performs a purification reaction, so that the formaldehyde purification efficiency and durability are improved.
The formaldehyde scavenger is adjusted by organic acid, so that the pH value of the formaldehyde scavenger liquid is in a neutral state, and the formaldehyde scavenger does not corrode metal ornaments and generate white marks.
In an embodiment of the present invention, the formaldehyde scavenger with high efficiency and long-term effectiveness comprises the following components by weight: 0.8% of ammonium hydroxide, 0.2% of formaldehyde adsorbent, 0.1% of cellulose ether, 6% of composite phosphate, 4% of organic acid, 0.01% of mildew preventive and the balance of deionized water.
In an embodiment of the present invention, the mass fraction of ammonia in the ammonium hydroxide is 20-30%; the formaldehyde adsorbent is polyacrylamide and/or adipic dihydrazide; the cellulose ether is hydroxypropyl methyl cellulose ether and/or konjac flour; the composite phosphate is sodium hexametaphosphate and/or sodium pyrophosphate; the organic acid is tartaric acid and/or citric acid; the mildew preventive is Kathon.
The CAS number of the polyacrylamide is 9003-05-8, and the molecular formula is (C)3H5NO) n, polyacrylamide is a linear organic high molecular polymer, and is a high molecular water treatment flocculant product, which can specially adsorb suspended particles in water, and has a bridging effect among the particles, so that fine particles form larger flocs, and the sedimentation speed is accelerated.
Adipic dihydrazide, also known as dihydrazide, is a white crystal in pure form, and is easily dissolved in water and poisoned. It is mainly used for curing agent and paint auxiliary agent of epoxy powder paint, metal deactivator and other polymer auxiliary agent and water treatment agent. The homobifunctional crosslinking reagent is specially used for aldehyde to generate relatively stable hydrazone linkage. Can be used as a protein drug carrier after being crosslinked with sodium hyaluronate. And diacetone acrylamide plays a role in crosslinking the water emulsion and the water-soluble polymer. Can also be used as indoor formaldehyde adsorbent and intermediate raw material.
In an embodiment of the present invention, the mass fraction of ammonia in the ammonium hydroxide is 25%; the formaldehyde adsorbent is polyacrylamide; the cellulose ether is hydroxypropyl methyl cellulose ether.
In one embodiment of the present invention, the composite phosphate is sodium hexametaphosphate and sodium pyrophosphate according to a ratio of 1: (0.8-1.2) mixing; the organic acid is tartaric acid and citric acid according to a ratio of 1: (0.8-1.2) mixing. The formaldehyde scavenger is adjusted by organic acid, so that the pH value of the formaldehyde scavenger liquid is in a neutral state, and the formaldehyde scavenger does not corrode metal ornaments and generate white marks.
In one embodiment of the present invention, the composite phosphate is sodium hexametaphosphate and sodium pyrophosphate according to a ratio of 1: 1, mixing; the organic acid is tartaric acid and citric acid according to a ratio of 1: 1, mixing the components.
A method for preparing the formaldehyde scavenger with high efficiency and long-acting performance comprises the following steps:
preparing ammonium hydroxide, a formaldehyde adsorbent, cellulose ether, a composite phosphate, an organic acid, a mildew preventive and deionized water according to the weight percentage, adding 40-60% of deionized water into a reaction kettle, and stirring and dissolving the rest deionized water and the cellulose ether at 20-30 ℃ to obtain a cellulose ether aqueous solution;
step two, adding composite phosphate and organic acid into a reaction kettle added with deionized water, under the condition of stirring, opening steam in a jacket of the reaction kettle, heating to 30-60 ℃, and stirring until solids are completely dissolved to obtain a mixed solution;
and step three, adding a formaldehyde adsorbent, ammonium hydroxide, a cellulose ether aqueous solution and a mildew preventive into the mixed solution, under the stirring condition, opening steam to a jacket of the reaction kettle, heating to 30-60 ℃, stirring and mixing uniformly, cooling to room temperature, standing for at least 30min, and discharging to obtain the colorless and transparent formaldehyde scavenger.
The formaldehyde scavenger is a transparent liquid prepared by mixing and compounding ammonium hydroxide, an amide compound, a cationic water-soluble high molecular compound, high molecular cellulose ether, a dispersing agent, an organic acid, an antifogging agent and deionized water, has a simple preparation process, and is suitable for industrial large-scale production.
In one embodiment of the invention, the temperature of the jacket in the second step is 30-40 ℃, and the stirring time is 5-10 min; the temperature of a jacket in the third step is 30-40 ℃, and the stirring time is 15-20 min.
As described above, the formaldehyde scavenger with high efficiency and long-term effectiveness and the preparation method thereof of the invention have the following beneficial effects: the formaldehyde scavenger is a transparent liquid prepared by mixing and compounding ammonium hydroxide, an amide compound, a cationic water-soluble high-molecular compound, high-molecular cellulose ether, a dispersing agent, an organic acid, an antifogging agent and deionized water, and firstly, the formaldehyde scavenger generates irreversible hexamethylenetetramine through the reaction of ammonia and formaldehyde, so that the formaldehyde can be efficiently removed; after the formaldehyde scavenger acts on the surface of the pollution source, a thin transparent coating can be formed, the amide compound can be adhered to the surface of the pollution source to capture formaldehyde released inside, and the formaldehyde scavenger performs a purification reaction, so that the formaldehyde purification efficiency and durability are improved; meanwhile, the formaldehyde scavenger ensures that the pH value of the formaldehyde scavenger liquid is in a neutral state, does not corrode metal ornaments and does not generate white marks through the regulation of organic acid.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Example 1
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 0.5% of ammonium hydroxide, 0.5% of polyacrylamide, 0.1% of hydroxypropyl methyl cellulose ether, 1% of sodium hexametaphosphate, 1% of sodium pyrophosphate, 1% of tartaric acid, 1% of citric acid, 0.01% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 20%.
The method for preparing 100kg of the formaldehyde scavenger with high efficiency and long-acting performance comprises the following steps:
s1, weighing 50kg of deionized water and putting into a reaction kettle;
s2, weighing 1kg of sodium hexametaphosphate, 1kg of sodium pyrophosphate, 1kg of tartaric acid and 1kg of citric acid, putting the materials into a reaction kettle, stirring, heating the materials to 30-40 ℃ by opening steam in a jacket, and dissolving the materials completely;
s3, weighing 0.5kg of polyacrylamide, putting into a reaction kettle, and stirring;
s4, weighing 0.5kg of 25% ammonium hydroxide, putting into a reaction kettle, and stirring;
s5, weighing 0.1kg of hydroxypropyl methyl cellulose ether, adding the weighed hydroxypropyl methyl cellulose ether into the balance of deionized water, stirring to completely dissolve the hydroxypropyl methyl cellulose ether, and adding the mixture into a reaction kettle;
s6, weighing 0.01kg of kasong, putting into a reaction kettle, and stirring for 15-20 min;
s7, standing for 30min and discharging to obtain the colorless and transparent formaldehyde scavenger.
Example 3
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 1.0% of ammonium hydroxide, 1.0% of polyacrylamide, 0.5% of hydroxypropyl methyl cellulose ether, 5% of sodium hexametaphosphate, 5% of sodium pyrophosphate, 3% of tartaric acid, 3% of citric acid, 0.05% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 30 percent.
The formaldehyde scavenger of example 2 was prepared according to the procedure of example 1 above.
Example 3
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 0.8% of ammonium hydroxide, 0.8% of adipic acid dihydrazide, 0.3% of hydroxypropyl methyl cellulose ether, 3% of sodium hexametaphosphate, 5% of sodium pyrophosphate, 3% of tartaric acid, 2% of citric acid, 0.03% of kasons and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 25%.
The formaldehyde scavenger of example 3 was prepared according to the procedure described above for example 1.
Example 4
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 0.8% of ammonium hydroxide, 0.2% of polyacrylamide, 0.1% of hydroxypropyl methyl cellulose ether, 3% of sodium hexametaphosphate, 3% of sodium pyrophosphate, 2% of tartaric acid, 2% of citric acid, 0.01% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 25%.
The formaldehyde scavenger of example 4 was prepared according to the procedure described above for example 1.
Example 5
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 1.0% of ammonium hydroxide, 0.8% of polyacrylamide, 0.3% of hydroxypropyl methyl cellulose ether, 3% of sodium hexametaphosphate, 3% of sodium pyrophosphate, 2% of tartaric acid, 2% of citric acid, 0.01% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 25%.
The formaldehyde scavenger of example 5 was prepared according to the procedure described above for example 1.
Example 6
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 0.8% of ammonium hydroxide, 0.5% of polyacrylamide, 0.5% of hydroxypropyl methyl cellulose ether, 5% of sodium hexametaphosphate, 5% of sodium pyrophosphate, 3% of tartaric acid, 3% of citric acid, 0.05% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 25%.
The formaldehyde scavenger of example 6 was prepared according to the procedure described above for example 1.
Comparative example 1
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 0.8% of ammonium hydroxide, 0.2% of polyacrylamide, 0.1% of hydroxypropyl methyl cellulose ether, 3% of sodium hexametaphosphate, 3% of sodium pyrophosphate, 0.01% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 25%.
The method for preparing 100kg of the formaldehyde scavenger with high efficiency and long-acting performance comprises the following steps:
s1, weighing 50kg of deionized water and putting into a reaction kettle;
s2, weighing 3kg of sodium hexametaphosphate and 3kg of sodium pyrophosphate, putting the sodium hexametaphosphate and the 3kg of sodium pyrophosphate into a reaction kettle, stirring, heating to 30-40 ℃ by opening steam in a jacket, and dissolving completely;
s3, weighing 0.2kg of polyacrylamide, putting into a reaction kettle, and stirring;
s4, weighing 0.8kg of 25% ammonium hydroxide, putting into a reaction kettle, and stirring;
s5, weighing 0.1kg of hydroxypropyl methyl cellulose ether, adding the weighed hydroxypropyl methyl cellulose ether into the balance of deionized water, stirring to completely dissolve the hydroxypropyl methyl cellulose ether, and adding the mixture into a reaction kettle;
s6, weighing 0.01kg of kasong, putting into a reaction kettle, and stirring for 15-20 min;
s7, standing for 30min and discharging to obtain the colorless and transparent formaldehyde scavenger.
Comparative example 2
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 0.8% of ammonium hydroxide, 0.2% of polyacrylamide, 3% of sodium hexametaphosphate, 3% of sodium pyrophosphate, 2% of tartaric acid, 2% of citric acid, 0.01% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 25%.
The method for preparing 100kg of the formaldehyde scavenger with high efficiency and long-acting performance comprises the following steps:
s1, weighing 50kg of deionized water and putting into a reaction kettle;
s2, weighing 3kg of sodium hexametaphosphate, 3kg of sodium pyrophosphate, 2kg of tartaric acid and 2kg of citric acid, putting into the reaction kettle together, stirring, heating to 30-40 ℃ by opening steam in a jacket, and dissolving completely;
s3, weighing 0.2kg of polyacrylamide, putting into a reaction kettle, and stirring;
s4, weighing 0.8kg of 25% ammonium hydroxide, putting into a reaction kettle, and stirring;
s5, weighing 0.01kg of kasong, putting into a reaction kettle, and stirring for 15-20 min;
s6, standing for 30min and discharging to obtain the colorless and transparent formaldehyde scavenger.
Comparative example 3
A high-efficiency long-acting formaldehyde scavenger comprises the following components in percentage by weight: 0.8% of ammonium hydroxide, 0.2% of polyacrylamide, 0.1% of hydroxypropyl methyl cellulose ether, 3% of sodium hexametaphosphate, 3% of sodium pyrophosphate, 2% of tartaric acid, 2% of citric acid, 0.01% of cason and the balance of deionized water;
wherein the mass fraction of ammonia in the ammonium hydroxide is 25%.
The method for preparing 100kg of the formaldehyde scavenger with high efficiency and long-acting performance comprises the following steps:
s1, weighing deionized water and putting into a reaction kettle;
s2, weighing 3kg of sodium hexametaphosphate, 3kg of sodium pyrophosphate, 2kg of tartaric acid, 2kg of citric acid, 0.2kg of polyacrylamide, 0.8kg of 25% ammonium hydroxide, 0.1kg of hydroxypropyl methyl cellulose ether and 0.01kg of kasong, putting the materials into a reaction kettle, stirring, heating the materials to 30-40 ℃ by opening steam in a jacket, and stirring for 15-20 min;
s3, standing for 30min and discharging to obtain the colorless and transparent formaldehyde scavenger.
The formaldehyde scavengers prepared in examples 1 to 6 and comparative examples 1 to 3 pass the following tests, and the test results are shown in table 1:
formaldehyde clearance test procedure:
1. preparation of samples: 100g of the sample was sprayed onto 3 sheets of 1 square meter base paper in 3 portions.
2. Preparation of the release source, a 5-layer piece of medical absorbent gauze was wound on 2 glass rods 5mm in diameter and 3cm in length, fixed with cotton thread and placed upright in a 500ml reagent bottle, filled with 200ml of a contaminant (formaldehyde 0.2%), labelled A1, A2.
3. Suspending untreated base paper in a blank test chamber A, suspending the base paper sprayed with the purifying material in a test chamber B, wherein the spraying purification of the base paper is as follows: 100ml of formaldehyde scavenger was sprayed onto 3 sheets of 1 square meter base paper.
4. The containers with the prepared pollutant release sources a1 and a2 were placed in a 1.5 cubic meter blank test chamber a and a 1.5 cubic meter sample test chamber B, respectively, and the hatch doors were immediately closed.
5. And (4) starting fans of the blank test A and the sample test chamber B, stirring for 10min, and then closing the fans.
6. After 24h of action, sampling the concentration of air pollutants in the two chambers, determining the concentration, analyzing and testing, and calculating the removal rate according to the termination concentration of the sample chamber and the blank chamber. Calculating the formula:
removal rate y (%) - (cA-cB)/cA 100% (cA is blank compartment concentration, cB is test compartment concentration) table 1
The formaldehyde scavenger prepared in example 5 above passes the following tests, the results of which are shown in table 2:
indoor formaldehyde removal:
1. a control sample is obtained by sampling at a selected sampling point in a room, and the concentration of formaldehyde, benzene and TVOC in the control sample is determined.
2. After sampling, the formaldehyde scavenger of example 5 was used at 22.5ml/m3The concentration of the formaldehyde scavenger is uniformly sprayed indoors and immediately sealed, so that the formaldehyde scavenger acts for 24 hours and then samples are taken at the same sampling point to obtain a sample to be measured, and the concentration of formaldehyde, benzene and TVOC in a control sample is measured.
Table 2
| Detecting items | Control sample | Example 5 | Detection limit value (GB50325-2010) |
| Formaldehyde/(mg/m)3) | 0.22 | 0.03 | ≤0.08 |
| Benzene/(mg/m)3) | ＜0.05 | ＜0.005 | ≤0.09 |
| TVOC/(mg/m3) | 0.635 | 0.24 | ≤0.50 |
The test experiment of example 5 with the highest formaldehyde removal rate was conducted, and it can be seen from the data that the formaldehyde after the treatment with the formaldehyde scavenger of the present invention reached the national standard and the contents of benzene and TVOC were also reduced.
In conclusion, the formaldehyde scavenger of the invention firstly generates irreversible hexamethylenetetramine through the reaction of ammonia and formaldehyde, and can efficiently remove formaldehyde; after the formaldehyde scavenger acts on the surface of a pollution source, a thin transparent coating can be formed, and the formaldehyde purification efficiency and durability are improved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The formaldehyde scavenger with high efficiency and long acting is characterized by comprising the following components in percentage by weight: 0.5 to 1.0 percent of ammonium hydroxide, 0.1 to 1.0 percent of formaldehyde adsorbent, 0.1 to 0.5 percent of cellulose ether, 2 to 10 percent of composite phosphate, 2 to 6 percent of organic acid, 0.01 to 0.05 percent of mildew preventive and the balance of deionized water.
2. A high efficiency, long lasting formaldehyde scavenger according to claim 1 wherein: the formaldehyde scavenger with high efficiency and long-acting performance comprises the following components in percentage by weight: 0.8% of ammonium hydroxide, 0.2% of formaldehyde adsorbent, 0.1% of cellulose ether, 6% of composite phosphate, 4% of organic acid, 0.01% of mildew preventive and the balance of deionized water.
3. A high efficiency, long acting formaldehyde scavenger according to claim 1 or 2, wherein: the mass fraction of ammonia in the ammonium hydroxide is 20-30%; the formaldehyde adsorbent is polyacrylamide and/or adipic dihydrazide; the cellulose ether is hydroxypropyl methyl cellulose ether and/or konjac flour; the composite phosphate is sodium hexametaphosphate and/or sodium pyrophosphate; the organic acid is tartaric acid and/or citric acid; the mildew preventive is Kathon.
4. A high efficiency, long lasting formaldehyde scavenger according to claim 3 wherein: the mass fraction of ammonia in the ammonium hydroxide is 25%; the formaldehyde adsorbent is adipic acid dihydrazide; the cellulose ether is hydroxypropyl methyl cellulose ether.
5. A high efficiency, long lasting formaldehyde scavenger according to claim 3 wherein: the composite phosphate is sodium hexametaphosphate and sodium pyrophosphate, and the weight ratio of the composite phosphate is 1: (0.8-1.2) mixing; the organic acid is tartaric acid and citric acid according to a ratio of 1: (0.8-1.2) mixing.
6. A high efficiency, long lasting formaldehyde scavenger according to claim 5 wherein: the composite phosphate is sodium hexametaphosphate and sodium pyrophosphate, and the weight ratio of the composite phosphate is 1: 1, mixing; the organic acid is tartaric acid and citric acid according to a ratio of 1: 1, mixing the components.
7. A method for preparing the formaldehyde scavenger with high efficiency and long-term effectiveness as defined in any one of claims 1 to 6, which comprises the following steps:
preparing ammonium hydroxide, a formaldehyde adsorbent, cellulose ether, a composite phosphate, an organic acid, a mildew preventive and deionized water according to the weight percentage, adding 40-60% of deionized water into a reaction kettle, and stirring and dissolving the rest deionized water and the cellulose ether at 20-30 ℃ to obtain a cellulose ether aqueous solution;
step two, adding composite phosphate and organic acid into a reaction kettle added with deionized water, under the condition of stirring, opening steam in a jacket of the reaction kettle, heating to 30-60 ℃, and stirring until solids are completely dissolved to obtain a mixed solution;
and step three, adding a formaldehyde adsorbent, ammonium hydroxide, a cellulose ether aqueous solution and a mildew preventive into the mixed solution, under the stirring condition, opening steam to a jacket of the reaction kettle, heating to 30-60 ℃, stirring and mixing uniformly, cooling to room temperature, standing for at least 30min, and discharging to obtain the colorless and transparent formaldehyde scavenger.
8. The method for preparing the formaldehyde scavenger with high efficiency and long acting property according to claim 7, wherein the formaldehyde scavenger comprises: in the second step, the temperature of the jacket is 30-40 ℃, and the stirring time is 5-10 min; the temperature of a jacket in the third step is 30-40 ℃, and the stirring time is 15-20 min.
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