CN113480071B - Process for treating and recycling waste liquid of water-based adhesive - Google Patents
Process for treating and recycling waste liquid of water-based adhesive Download PDFInfo
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- CN113480071B CN113480071B CN202110793447.9A CN202110793447A CN113480071B CN 113480071 B CN113480071 B CN 113480071B CN 202110793447 A CN202110793447 A CN 202110793447A CN 113480071 B CN113480071 B CN 113480071B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a process for treating and recycling waste liquid of a water-based adhesive, which comprises the following steps: step one: soft water is added into a reaction container, stirring is carried out, and heating is carried out until the temperature is higher than or equal to 85 ℃; step two: adding a certain amount of dispersing agent, and continuing stirring; step three: filtering the solution in the reaction container by using a filter screen with 200-350 meshes to obtain filtrate; step four: standing the filtrate at normal temperature for a first time; step five: if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a production raw material of the next water-based adhesive; the filtered solution is used as a material for preparing the next batch of water-based adhesive, so that the waste liquid can be recycled, the high standard of zero emission is achieved, the cost is reduced, and the economic benefit of enterprises is improved.
Description
Technical Field
The invention relates to a process for treating and recycling waste liquid in a production process, in particular to a process for treating and recycling waste liquid in a water-based adhesive production process.
Background
Generally, after the aqueous acrylic ester adhesive is produced for several times, because of the viscosity of the aqueous acrylic ester adhesive, the adhesive clots and impurity precipitates can be generated on the inner wall of the reaction kettle, if the production is continued, the production of the subsequent aqueous acrylic ester adhesive can be influenced, the control of technological parameters in the synthesis process is influenced, the clots and impurity precipitates can be left in the adhesive produced subsequently, and the production of the subsequent adhesive and the quality of products are influenced.
The common treatment method is that after forming the clot and the journal precipitate, water is added to raise the temperature, stirring and cleaning are carried out, the clot and the journal precipitate on the wall of the reaction vessel are removed by stirring and heating, but the solution containing the clot and the journal precipitate forms waste liquid in the production process of the aqueous acrylate adhesive. Today, environmental awareness and health awareness are increasingly higher, the requirement on the environmental protection problem of the adhesive is more strict, and the environmental protection is more important, so that the discharge of the part of the cleaned waste liquid always plagues the production enterprises of a plurality of adhesives.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a process for treating and recycling the waste liquid of the water-based adhesive, which realizes the treatment and recycling of the waste liquid, meets the environmental protection requirement and reduces the cost.
The invention provides a process for treating and recycling waste liquid of a water-based adhesive, which is characterized by comprising the following steps of:
step one: soft water is added into a reaction container, stirring is carried out, and heating is carried out until the temperature is higher than or equal to 85 ℃;
step two: adding a certain amount of dispersing agent, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 200-350 meshes to obtain filtrate;
step four: standing the filtrate at normal temperature for a first time;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a production raw material of the next water-based adhesive.
Preferably, in the first step, the soft water added accounts for 40-65% of the capacity of the reaction vessel.
Preferably, in the second step, the mass of the dispersing agent accounts for 0.5% -3.8% of the total mass of the solution in the reaction kettle.
Preferably, in the second step, an anticoagulant is added, wherein the anticoagulant accounts for 0.25-3.0% of the total mass of the solution in the reaction kettle.
Preferably, the anticoagulant is p-hydroxy benzene alkyl acid ester.
Preferably, the anticoagulant is at least one of paraben, paraglycolic acid ester and parahydroxyphenylpropionate.
Preferably, the dispersant is a polyacrylic acid derivative.
Preferably, the dispersing agent is at least one of polyacrylic acid, sodium polyacrylate, potassium polyacrylate, ammonium polyacrylate and polyacrylate.
Preferably, the fifth step includes: if the filtrate is kept stand for the first time and no precipitate or clot is separated out, a certain amount of the filtrate, the acrylic acid derivative, the catalyst and soft water are added into a reaction vessel and stirred to form milky emulsion, the temperature is raised to be higher than 80 ℃ and the aqueous acrylic acid adhesive is obtained after the reaction for 5 to 12 hours.
Preferably, the filtrate, acrylic acid derivative, catalyst and soft water are added to the reaction vessel in such amounts that the solid-to-liquid ratio in the reaction vessel is 55% to 68%.
Preferably, the first step further comprises detecting whether the reaction vessel needs to be cleaned.
Preferably, the step of detecting whether the reaction vessel needs to be cleaned comprises: adding a certain volume of liquid into the reaction container, heating the reaction container, recording the heating time required by heating to a preset temperature, and executing the first step when the heating time is longer than the preset time.
Preferably, the method further comprises a step six of judging whether the size of the sediment or the clot is larger than a preset size or not if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, if not, directly using the filtrate as a production raw material of the next water-based adhesive, and if so, performing secondary filtration on the filtrate again, and using the secondary filtrate as the production raw material of the next water-based adhesive.
The technical scheme of the invention can realize the following positive effects:
1. the process for treating and recycling the waste liquid of the water-based adhesive is used for treating the waste liquid of a pot washing of the water-based adhesive, and meets the environmental protection requirement.
2. The process for treating and recycling the waste liquid of the water-based adhesive is characterized in that a dispersing agent and an anti-coagulant are added into the waste liquid to be filtered and then used as water for preparing the next batch of water-based adhesive, so that the waste liquid can be recycled, the high standard of zero emission is achieved, and the cost is reduced.
3. The process for treating and recycling the waste liquid of the water-based adhesive does not influence the quality of the water-based adhesive in the next batch due to the addition of the dispersing agent and the anti-coagulant in the waste liquid.
4. The process for treating and recycling the waste liquid of the water-based adhesive can be recycled without limit, and the economic benefit of enterprises is improved.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present invention is not to be construed as being limited.
The embodiment of the invention provides a process for treating and recycling waste liquid of a water-based adhesive, which comprises the following steps:
step one: soft water is added into a reaction container, stirring is carried out, and heating is carried out until the temperature is higher than or equal to 85 ℃;
step two: adding a certain amount of dispersing agent, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 200-350 meshes to obtain filtrate;
step four: standing the filtrate at normal temperature for a first time;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a production raw material of the next water-based adhesive.
Wherein, the soft water refers to water which does not contain or contains less soluble calcium and magnesium compounds.
The process for treating and recycling the waste liquid of the water-based adhesive is used for treating the waste liquid of a pot washing of the water-based adhesive, thereby meeting the environmental protection requirement; the dispersing agent and the anti-coagulant are added into the waste liquid to be filtered and then used as water for preparing the next batch of water-based adhesive, so that the waste liquid can be recycled, the cost is reduced, and the zero-emission high standard is achieved; in addition, the quality of the water-based adhesive in the next batch is not affected by the dispersant and the anti-coagulant added in the waste liquid; in addition, the process for treating and recycling the waste liquid of the water-based adhesive can be recycled without limit, and the economic benefit of enterprises is improved.
Further, in the first step, the soft water added accounts for 40-65% of the capacity of the reaction vessel. Preferably, the soft water added accounts for 58% of the capacity of the reaction vessel. And stirring is matched, and the added soft water is stirred, so that the water level of the added soft water rises to a preset height, for example, the wall of a reaction kettle to be covered is covered, and the aim of better cleaning the reaction kettle is fulfilled. Thus, the stirring speed is selected according to the amount of soft water to be added and the desired predetermined height, and will not be described in detail herein.
Further, in the first step, the temperature is raised to 85 ℃ or higher. The temperature rise can enable substances such as gel and the like to be dissolved in the soft water, so that the aim of thorough cleaning is fulfilled. Preferably, the temperature rise is selected according to the physical characteristics of the substance, in this embodiment, the temperature is preferably 85 degrees celsius, but certainly greater than 85 degrees celsius, for example, 100 degrees celsius, so as not to cause the substance to deteriorate, which is not described herein.
Further, in the second step, the dispersing agent is 0.5% -3.8% of the total mass of the solution in the reaction kettle. If the mass fraction of the dispersing agent is too low, the effect of waste liquid treatment is reduced, and effective substances in the waste liquid cannot be efficiently recycled, and if the mass fraction of the dispersing agent is too high, the recycling of the effective substances in the waste liquid is naturally facilitated, but the quality of the water-based adhesive in the next batch is affected, the waste of the dispersing agent is caused, and the production cost is increased. Preferably, the dispersing agent is 1.5% of the total mass of the solution in the reaction kettle.
In this embodiment, the dispersant is a polyacrylic acid derivative, for example, at least one of polyacrylic acid, sodium polyacrylate, potassium polyacrylate, ammonium polyacrylate, and polyacrylate. The dispersing agent is selected according to the produced water-based adhesive, so that substances with the same or similar components as the product can be reduced, the introduction of other substances or impurities can be reduced, and the quality of the water-based adhesive in the next batch can be ensured to the greatest extent. In this example, the acrylic adhesive was produced, and thus, the purpose of selecting a polyacrylic dispersant was to minimize the introduction of other substances or impurities.
Further, in the second step, an anticoagulant is added, wherein the anticoagulant accounts for 0.25-3.0% of the total mass of the solution in the reaction kettle. The dispersing agent and the anticoagulant are added into the waste liquid, so that gel and other substances can be dispersed and dissolved, and meanwhile, the dispersed and dissolved state can be maintained, the subsequent recycling is facilitated, and the quality of the subsequent production is ensured. For the amount of anticoagulant added, reference is made to the selection criteria for the dispersant, and will not be described in detail herein. In this embodiment, the anticoagulant accounts for 1.0% of the total mass of the solution in the reaction kettle.
Further, the anticoagulant is p-hydroxy-benzene alkyl acid ester, for example, at least one of p-hydroxy-benzoate, p-hydroxy-acetate and p-hydroxy-benzene propionate, but not limited to this, so as to meet the anticoagulation requirement and not affect the quality of the water-based adhesive in the next batch.
Further, the fifth step includes: and if the filtrate is kept stand for the first time, judging whether sediment and clot are precipitated or not by observing or filtering again. Of course, in actual operation, if the filtrate is left to stand for the first time, a bottle of the filtrate may be taken out with a transparent glass bottle, observed, and then filtered to determine whether there is precipitation or clot precipitation.
Further, the fifth step: if the filtrate is kept stand for the first time and no sediment or clot is separated out, adding a certain amount of the filtrate, the acrylic acid derivative, the catalyst and soft water into a reaction vessel, stirring to form milky emulsion, heating to more than 80 ℃, and reacting for 5-12 hours to obtain the acrylic acid aqueous adhesive. If the filtrate is kept stand for the first time, no sediment or clot is separated out, the next production requirement is met, and therefore a certain amount of filtrate, acrylic acid derivative, catalyst and soft water are added into the reaction container to prepare the next batch of acrylic acid aqueous adhesive, and the recycling of waste liquid is realized.
Further, a certain amount of the filtrate, acrylic acid derivative, catalyst and soft water are added into the reaction kettle so that the solid-liquid ratio is 55% -68%.
Further, the method further comprises a step six of judging whether the size of the sediment or the clot is larger than a preset size or not if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, directly using the filtrate as the production raw material of the next water-based adhesive, and performing secondary filtration on the filtrate again by using a 200-300-mesh filter screen if the size of the sediment or the clot is larger than the preset size, and using the secondary filtrate as the production raw material of the next water-based adhesive. For example, the predetermined size is 50 microns, but not limited thereto.
Further, the first step further includes detecting whether the reaction kettle needs to be cleaned.
Further, the step of detecting whether the cleaning of the reaction vessel is required comprises: adding a certain volume of liquid into the reaction kettle, heating the reaction kettle, recording the heating time required by heating to a preset temperature, and executing the first step when the heating time is longer than the preset time. For example, the reaction vessel is heated to 85 degrees celsius, and if the actual heating time is 15 minutes, which is higher than a predetermined value of 10 minutes, it is determined that the reaction vessel needs to be cleaned. Of course, the detection method is not limited thereto, and for example, whether the reaction vessel needs to be cleaned is determined by determining whether the product contains a substance such as a clot or a precipitate; or judging whether the thickness of the agglomerate on the inner wall of the container, the wall thickness of the whole reaction container or the weight of the whole reaction container exceeds a preset value, if so, cleaning is needed, otherwise, the cleaning is not needed. In addition, the wall thickness can be judged by means of the light detector through the reflection of the light irradiated on the inner wall of the reaction container, and whether cleaning is needed or not is judged.
Preferably, in practical application, in order to achieve better cleaning of the reaction kettle and higher recovery rate of the adhesive agent of the clot in the reaction kettle, in the first step, after soft water is added to the reaction kettle, the substance adhered on the inner wall of the reaction kettle is shoveled off by a turner or other tool and enters the soft water so as to be dispersed and dissolved after the dispersing agent is added.
Example 1
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 40 percent of the capacity of the reaction container, stirring, and heating to 85 ℃;
step two: adding a certain amount of polyacrylic acid, wherein the amount of the polyacrylic acid accounts for 0.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a 200-mesh filter screen to obtain filtrate;
step four: standing the filtrate for 2 days;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive.
Example 2
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 50 percent of the capacity of the reaction container, stirring, and heating to 100 ℃;
step two: adding a certain amount of sodium polyacrylate, wherein the amount of the sodium polyacrylate accounts for 1.0% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by a filter screen with 350 meshes to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive.
Example 3
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 55 percent of the capacity of the reaction container, stirring, and heating to 90 ℃;
step two: adding a certain amount of potassium polyacrylate, wherein the amount of the potassium polyacrylate accounts for 1.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 300 meshes to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive.
Example 4
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 65 percent of the capacity of the reaction container, stirring, and heating to 100 ℃;
step two: adding a certain amount of ammonium polyacrylate and potassium polyacrylate, wherein the amount of the ammonium polyacrylate and the potassium polyacrylate accounts for 2.0% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by a filter screen with 250 meshes to obtain filtrate;
step four: standing the filtrate for 4 days;
step five: if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive;
and step six, if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, judging whether the size of the sediment or the clot is larger than a preset size, if not, directly using the filtrate as the production raw material of the next water-based adhesive, and if so, performing secondary filtration on the filtrate by using a 200-mesh filter screen again, and using the secondary filtrate as the production raw material of the next water-based adhesive.
Example 5
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 50 percent of the capacity of the reaction container, stirring, and heating to 85 ℃;
step two: adding a certain amount of polyacrylate ammonium polyacrylate and sodium polyacrylate, wherein the amount of polyacrylate and sodium polyacrylate accounts for 2.8% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a 200-mesh filter screen to obtain filtrate;
step four: standing the filtrate for 4 days;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive.
Example 6
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 55 percent of the capacity of the reaction container, stirring, and heating to 95 ℃;
step two: adding a certain amount of polyacrylic acid and parahydroxybenzoate, wherein the amount of polyacrylic acid accounts for 1.5% of the total mass of the solution in the reaction kettle, and the mass of parahydroxybenzoate accounts for 3.0% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by a filter screen with 350 meshes to obtain filtrate;
step four: standing the filtrate for 4 days;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive.
Example 7
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 45 percent of the capacity of the reaction container, stirring, and heating to 85 ℃;
step two: adding a certain amount of sodium polyacrylate and p-hydroxy acetate, wherein the amount of the sodium polyacrylate accounts for 1.5% of the total mass of the solution in the reaction kettle, and the mass of the p-hydroxy acetate accounts for 2.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by a filter screen with 250 meshes to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive.
Example 8
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 55 percent of the capacity of the reaction container, stirring, and heating to 95 ℃;
step two: adding a certain amount of potassium polyacrylate and parahydroxy phenylpropionate, wherein the amount of the potassium polyacrylate accounts for 1.7% of the total mass of the solution in the reaction kettle, and the mass of the parahydroxy phenylpropionate accounts for 1.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a 200-mesh filter screen to obtain filtrate;
step four: standing the filtrate for 4 days;
step five: if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive;
and step six, if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, judging whether the size of the sediment or the clot is larger than a preset size, if not, directly using the filtrate as the production raw material of the next water-based adhesive, and if so, performing secondary filtration on the filtrate by using a 200-mesh filter screen again, and using the secondary filtrate as the production raw material of the next water-based adhesive.
Example 9
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 65 percent of the capacity of the reaction container, stirring, and heating to 85 ℃;
step two: adding a certain amount of ammonium polyacrylate and sodium polyacrylate, wherein the amount of the ammonium polyacrylate accounts for 3.8% of the total mass of the solution in the reaction kettle, and the mass of the sodium polyacrylate accounts for 1.0% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 300 meshes to obtain filtrate;
step four: standing the filtrate for 4 days;
step five: and if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive.
Example 10
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 55 percent of the capacity of the reaction container, stirring, and heating to 90 ℃;
step two: adding a certain amount of polyacrylate ammonium polyacrylate and potassium polyacrylate, wherein the amount of polyacrylate accounts for 2.8% of the total mass of the solution in the reaction kettle, and the mass of sodium polyacrylate accounts for 0.25% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 300 meshes to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: if no precipitate or clot is precipitated after the filtrate is kept stand for the first time, the filtrate is used as a raw material for the next production of the aqueous adhesive;
and step six, if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, judging whether the size of the sediment or the clot is larger than a preset size, if not, directly using the filtrate as the production raw material of the next water-based adhesive, and if so, performing secondary filtration on the filtrate again by using a 300-mesh filter screen, and using the secondary filtrate as the production raw material of the next water-based adhesive.
Example 11
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 40 percent of the capacity of the reaction container, stirring, and heating to 100 ℃;
step two: adding a certain amount of polyacrylic acid, wherein the amount of the polyacrylic acid accounts for 0.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 300 meshes to obtain filtrate;
step four: standing the filtrate for 2 days;
step five: and if the filtrate is kept stand for the first time and no precipitate or clot is separated out, adding a certain amount of filtrate, acrylic acid derivative, catalyst and soft water into a reaction kettle to ensure that the solid-to-liquid ratio is 55%, stirring to form milky emulsion, heating to more than 80 ℃, and reacting for 5 hours to obtain the acrylic acid aqueous adhesive.
Example 12
Step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 65 percent of the capacity of the reaction container, stirring, and heating to 85 ℃;
step two: adding a certain amount of sodium polyacrylate, wherein the amount of the sodium polyacrylate accounts for 1.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a 200-mesh filter screen to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: and if the filtrate is kept stand for the first time and no precipitate or clot is separated out, adding a certain amount of filtrate, acrylic acid derivative, catalyst and soft water into a reaction kettle to make the solid-to-liquid ratio be 58%, stirring to form milky emulsion, heating to more than 80 ℃ and reacting for 5 hours to obtain the acrylic acid aqueous adhesive.
Example 13
Step zero: adding a certain volume of liquid into the reaction kettle, heating the reaction kettle, recording the heating time required by heating to a preset temperature, and executing the first step when the heating time is longer than the preset time;
step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 55 percent of the capacity of the reaction container, stirring, and heating to 90 ℃;
step two: adding a certain amount of polyacrylic acid and parahydroxybenzoate, wherein the amount of polyacrylic acid accounts for 0.5% of the total mass of the solution in the reaction kettle, and the mass of parahydroxybenzoate accounts for 3.0% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a 200-mesh filter screen to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: and if the filtrate is kept stand for the first time and no precipitate or clot is separated out, adding a certain amount of filtrate, acrylic acid derivative, catalyst and soft water into a reaction kettle to ensure that the solid-to-liquid ratio is 68%, stirring to form milky emulsion, heating to more than 80 ℃, and reacting for 12 hours to obtain the acrylic acid aqueous adhesive.
Example 14
Step zero: adding a certain volume of liquid into the reaction kettle, heating the reaction kettle, recording the heating time required by heating to a preset temperature, and executing the first step when the heating time is longer than the preset time;
step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 40 percent of the capacity of the reaction container, stirring, and heating to 95 ℃;
step two: adding a certain amount of sodium polyacrylate and p-hydroxy acetate, wherein the amount of the sodium polyacrylate accounts for 1.5% of the total mass of the solution in the reaction kettle, and the mass of the p-hydroxy acetate accounts for 2.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by a filter screen with 350 meshes to obtain filtrate;
step four: standing the filtrate for 2 days;
step five: if the filtrate is kept stand for the first time and no precipitate or clot is separated out, adding a certain amount of filtrate, acrylic acid derivative, catalyst and soft water into a reaction kettle to ensure that the solid-to-liquid ratio is 60%, stirring to form milky emulsion, heating to more than 80 ℃, and reacting for 10 hours to obtain the acrylic acid aqueous adhesive;
and step six, if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, judging whether the size of the sediment or the clot is larger than a preset size, if not, directly using the filtrate as the production raw material of the next water-based adhesive, and if so, performing secondary filtration on the filtrate again by using a 300-mesh filter screen, and using the secondary filtrate as the production raw material of the next water-based adhesive.
Example 15
Step zero: adding a certain volume of liquid into the reaction kettle, heating the reaction kettle, recording the heating time required by heating to a preset temperature, and executing the first step when the heating time is longer than the preset time;
step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 65 percent of the capacity of the reaction container, stirring, and heating to 85 ℃;
step two: adding a certain amount of potassium polyacrylate and parahydroxy phenylpropionate, wherein the amount of the potassium polyacrylate accounts for 1.7% of the total mass of the solution in the reaction kettle, and the mass of the parahydroxy phenylpropionate accounts for 1.5% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by a filter screen with 250 meshes to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: and if the filtrate is kept stand for the first time and no precipitate or clot is separated out, adding a certain amount of filtrate, acrylic acid derivative, catalyst and soft water into a reaction kettle to ensure that the solid-to-liquid ratio is 68%, stirring to form milky emulsion, heating to more than 80 ℃, and reacting for 12 hours to obtain the acrylic acid aqueous adhesive.
Example 16
Step zero: adding a certain volume of liquid into the reaction kettle, heating the reaction kettle, recording the heating time required by heating to a preset temperature, and executing the first step when the heating time is longer than the preset time;
step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 55 percent of the capacity of the reaction container, stirring, and heating to 90 ℃;
step two: adding a certain amount of ammonium polyacrylate and sodium polyacrylate, wherein the amount of the ammonium polyacrylate accounts for 2.8% of the total mass of the solution in the reaction kettle, and the mass of the sodium polyacrylate accounts for 1.0% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a 200-mesh filter screen to obtain filtrate;
step four: standing the filtrate for 4 days;
step five: if the filtrate is kept stand for the first time and no precipitate or clot is separated out, adding a certain amount of filtrate, acrylic acid derivative, catalyst and soft water into a reaction kettle to ensure that the solid-to-liquid ratio is 65%, stirring to form milky emulsion, heating to more than 80 ℃, and reacting for 7 hours to obtain the acrylic acid aqueous adhesive;
and step six, if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, judging whether the size of the sediment or the clot is larger than a preset size, if not, directly using the filtrate as the production raw material of the next water-based adhesive, and if so, performing secondary filtration on the filtrate again by using a 300-mesh filter screen, and using the secondary filtrate as the production raw material of the next water-based adhesive.
Example 17
Step zero: adding a certain volume of liquid into the reaction kettle, heating the reaction kettle, recording the heating time required by heating to a preset temperature, and executing the first step when the heating time is longer than the preset time;
step one: adding 2 tons of soft water into a reaction container, wherein the soft water accounts for 55 percent of the capacity of the reaction container, stirring, and heating to 95 ℃;
step two: adding a certain amount of polyacrylate ammonium polyacrylate and potassium polyacrylate, wherein the amount of polyacrylate accounts for 2.8% of the total mass of the solution in the reaction kettle, and the mass of sodium polyacrylate accounts for 0.25% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 300 meshes to obtain filtrate;
step four: standing the filtrate for 3 days;
step five: if the filtrate is kept stand for the first time and no precipitate or clot is separated out, adding a certain amount of filtrate, acrylic acid derivative, catalyst and soft water into a reaction kettle to make the solid-to-liquid ratio be 58%, stirring to form milky emulsion, heating to more than 80 ℃, and reacting for 10 hours to obtain the acrylic acid aqueous adhesive;
and step six, if the sediment or the clot is precipitated after the filtrate is kept stand for the first time, judging whether the size of the sediment or the clot is larger than a preset size, if not, directly using the filtrate as the production raw material of the next water-based adhesive, and if so, performing secondary filtration on the filtrate by using a 250-mesh filter screen again, and using the secondary filtrate as the production raw material of the next water-based adhesive.
Claims (6)
1. The process for treating and recycling the waste liquid of the water-based adhesive is characterized by comprising the following steps of:
step one: soft water is added into a reaction container, stirring is carried out, and heating is carried out until the temperature is higher than or equal to 85 ℃;
step two: adding polyacrylic acid derivatives, wherein the amount of the polyacrylic acid derivatives accounts for 0.5% -3.8% of the total mass of the solution in the reaction kettle, and continuing stirring;
step three: filtering the solution in the reaction container by using a filter screen with 200-350 meshes to obtain filtrate;
step four: standing the filtrate at normal temperature for 2 or 3 or 4 days;
step five: if no precipitate or clot is precipitated after the filtrate is stood for 2 or 3 or 4 days, the filtrate is used as a production raw material of the next water-based adhesive;
in the second step, an anticoagulant is added, wherein the anticoagulant is p-hydroxy benzene alkyl acid ester, and the mass of the anticoagulant accounts for 0.25-3.0% of the total mass of the solution in the reaction kettle.
2. The process for treating and recycling aqueous adhesive waste liquid according to claim 1, wherein the soft water added in the first step accounts for 40-65% of the capacity of the reaction vessel.
3. The process for treating and recycling waste liquid of aqueous adhesive according to claim 1, wherein the p-hydroxy-phenyl alkyl acid ester comprises at least one of p-hydroxy benzoate, p-hydroxy phenylacetate and p-hydroxy phenylpropionate.
4. The process for treating and recycling the waste liquid of the aqueous adhesive according to claim 1, wherein the polyacrylic acid derivative comprises at least one of sodium polyacrylate, potassium polyacrylate, ammonium polyacrylate and polyacrylate.
5. The process for treating and recycling the aqueous adhesive waste liquid according to claim 4, wherein the fifth step comprises: if the filtrate is kept stand for 2 or 3 or 4 days, no sediment or clot is separated out, the filtrate, the acrylic acid derivative, the catalyst and the soft water are added into a reaction container, so that the solid-liquid ratio in the reaction container is 55% -68%, the mixture is stirred to form milky emulsion, the temperature is raised to above 80 ℃, and the aqueous acrylic acid adhesive is obtained after the reaction for 5-12 hours.
6. The process for treating and recycling a waste liquid of an aqueous adhesive according to claim 1, further comprising a step six of judging whether the size of the precipitate or the clot is larger than a predetermined size if the precipitate or the clot is precipitated after the filtrate is left to stand, and if not, directly using the filtrate as a raw material for producing the next aqueous adhesive, and if so, performing secondary filtration on the filtrate again, and using the secondary filtrate as a raw material for producing the next aqueous adhesive.
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