Environment-friendly optical glass suspension, preparation method and application thereof

Abstract

This invention relates to the field of optical glass processing fluid technology, and discloses an environmentally friendly optical glass suspension, its preparation method, and its application. The environmentally friendly optical glass suspension comprises a thixotropic suspension component, a particle interface regulating component, a low-foaming cleaning and chip removal component, a weakly alkaline lubricating and rust-preventing component, a defoamer, a bactericide and preservative, and water, with a pH of 9.0–9.5. Some components of the particle interface regulating component, the low-foaming cleaning and chip removal component, and the weakly alkaline lubricating and rust-preventing component jointly generate a reversible triggered destabilization effect, maintaining the solid particles in suspension and dispersion during use. During the processing wastewater treatment stage, after CO2 introduction or triggering with a weakly acidic treatment agent, the solid particles and glass processing debris flocculate and settle. This invention can simultaneously achieve stable suspension during the processing stage, low-foaming cleaning, lubrication and rust prevention, and triggerable solid-liquid separation during the wastewater stage, and is suitable for grinding, polishing, or precision machining of optical glass, optical lenses, prisms, or wafers.

Description

Technical Field

[0001] This invention relates to the field of optical glass processing fluid technology, and in particular to an environmentally friendly optical glass suspension, its preparation method, and its application. Background Technology

[0002] In the precision grinding and polishing of optical glass, the suspension acts as a carrier for solid abrasive particles, performing multiple functions such as particle transport, uniform dispersion, lubrication and cooling, and cleaning and chip removal. However, existing solid-liquid hybrid processing fluids are prone to physical instability during static storage or low-flow-rate circulation, including solid sedimentation, stratification, and bottom hardening. These problems not only lead to uneven abrasive concentration in the circulating fluid supply system, directly affecting the machining accuracy and surface quality of precision components, but also frequently cause blockages in pumping pipelines, severely impacting production continuity.

[0003] To improve sedimentation stability, existing technologies generally employ strategies such as increasing the viscosity of the system structure or enhancing the charge repulsion between particles. Common practices include adding thickeners, synthetic polymeric suspending agents, or silicate sheet suspending agents to the system to improve its ability to hold high-density solid particles (such as white corundum, alumina, and cerium oxide), preventing irreversible aggregation and sedimentation due to gravity. While these methods extend the product's lifespan to some extent, research has found that simply pursuing high suspension stability often leads to new technological bottlenecks.

[0004] This "highly stable" strategy exhibits significant drawbacks in the wastewater treatment stage: the processed wastewater contains a large amount of fine abrasive particles, detached glass powder, and micron-sized processing debris. If the system is too stable, these solids are extremely difficult to settle and separate naturally in the wastewater treatment tank, directly resulting in extremely slow wastewater filtration and persistently high turbidity in the treated supernatant. This not only significantly increases the wastewater treatment load and costs for enterprises but also hinders the compliant treatment and reuse of industrial wastewater, making it difficult to meet the requirements of modern precision machining industries for green environmental protection and sustainable development. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide an environmentally friendly optical glass suspension, its preparation method, and its application. This environmentally friendly optical glass suspension can maintain stable suspension of solid particles during optical glass grinding, polishing, or precision machining, reducing particle sedimentation, stratification, and bottom hardening, lowering the risk of supply line blockage, and achieving low-foam wetting, cleaning and chip removal, lubrication and cooling, and equipment rust prevention at the processing interface. Simultaneously, the suspension can maintain stable suspension of solid particles during use, while during the wastewater treatment stage, it can be triggered by CO2 introduction or a weakly acidic treatment agent to cause flocculation and sedimentation of solid particles, glass powder, and processing debris. This resolves the technical contradiction between the traditional suspension system's requirement for stable suspension during use and rapid sedimentation during wastewater treatment.

[0006] The present invention solves the above-mentioned technical problems through the following technical means:

[0007] In a first aspect, the present invention provides an environmentally friendly optical glass suspension, comprising the following components by mass percentage:

[0008] The composition includes 0.20%–1.20% thixotropic suspension component, 0.20%–1.80% particle interface conditioning component, 0.20%–1.60% low-foaming cleaning and chip removal component, 2.00%–8.50% weak alkaline lubricating and rust-preventing component, 0.01%–0.20% defoamer, 0.02%–0.20% bactericide and preservative, with the balance being water; the pH of the environmentally friendly optical glass suspension is 9.0–9.5.

[0009] Among them, some components of the particle interface conditioning component, the low-foam cleaning and chip removal component, and the weak alkaline lubricating and rust-preventing component work together to generate a reversible triggering destabilization effect, so that the environmentally friendly optical glass suspension keeps the solid particles suspended and dispersed in the use state, and after being triggered by CO2 introduction or weak acid treatment agent in the processing waste liquid treatment stage, the solid particles and glass processing debris will flocculate and settle.

[0010] The thixotropic suspension component provides low shear viscosity and shear-thinning properties, making solid particles less prone to settling in a static state and easier to flow and spread under processing shear conditions. The particle interface conditioning component adjusts the hydration layer and charge state on the surface of solid particles, improving the dispersion stability of solid particles under weakly alkaline conditions. The low-foaming cleaning and chip removal component reduces the interfacial tension between solid particles, glass powder, and the aqueous phase, allowing processing debris to be carried away by the aqueous phase and reducing the impact of foam on the circulating fluid supply. The weakly alkaline lubricating and rust-inhibiting component provides lubrication, cooling, rust prevention, corrosion inhibition, and pH buffering under pH conditions of 9.0–9.5.

[0011] Preferably, the thixotropic suspension component includes a thixotropic suspending agent and a nanosheet suspending agent;

[0012] The thixotropic suspending agent is selected from one or more of the following: vegan gum, gellan gum, xanthan gum, sodium alginate, and sodium carboxymethyl cellulose.

[0013] Furthermore, the thixotropic suspending agent comprises vilan gum and gellan gum. The mass ratio of vilan gum to gellan gum is (1-5):(0.3-2).

[0014] Vilan gum exhibits good salt resistance, shear resistance, and low-shear thickening ability, which can improve the anti-settling ability of suspensions during standing. Gellan gum enhances the structural resilience of the system, allowing the suspension to recover its low-shear structural viscosity more quickly after pumping or grinding shearing. The combination of the two can reduce the problems of viscosity, stringing, or increased pumping resistance caused by excessive use of a single colloid.

[0015] The nanosheet suspending agent is selected from one or more of lithium saponite, modified bentonite, nano-montmorillonite, attapulgite, and magnesium aluminum silicate.

[0016] Furthermore, the nanosheet suspending agent is lithium saponite;

[0017] Lithium saponite can form a fine lamellar structure in aqueous phase and form physical cross-links and spatial support structures with thixotropic suspending agents, thereby improving its ability to hold solid particles such as white corundum, alumina, cerium oxide, and silica. Compared with simply increasing the amount of polymer, lithium saponite helps to improve the anti-settling ability at lower viscosity and reduces the risk of excessive thickening of the system.

[0018] The particle interface modulating component is selected from one or more of the following: sodium polyaspartate, polycarboxylate, low molecular weight sodium polyacrylate, sodium gluconate, sodium citrate, and methylglycine diacetate.

[0019] Furthermore, the particle interface conditioning component includes sodium polyaspartate and sodium gluconate, with a mass ratio of sodium polyaspartate to sodium gluconate of (1-3):(0.5-2).

[0020] Sodium polyaspartate can form a hydrophilic adsorption layer on the surface of solid particles, providing charge repulsion and steric hindrance, thus reducing particle aggregation; sodium gluconate can improve metal ion complexation and particle interface hydration state, while also having certain washing aid and corrosion inhibitor effects. The combination of the two can improve the dispersion stability of solid particles under weakly alkaline conditions and provide an adjustable particle interface layer for subsequent CO2 or weak acid-triggered destabilization.

[0021] Preferably, the low-foaming cleaning and chip removal component includes a low-foaming cleaning surfactant, an alkyl glycoside surfactant, and an amphoteric surfactant; the mass ratio of the low-foaming cleaning surfactant, the alkyl glycoside surfactant, and the amphoteric surfactant is (2-8):(1-4):(0.5-3).

[0022] Furthermore, the mass ratio of the low-foaming cleaning surfactant, the alkyl glycoside surfactant, and the amphoteric surfactant is 4:2:1.

[0023] Preferably, the low-foaming cleaning surfactant is selected from one or more of EO / PO block polyether, C8-C14 fatty alcohol polyoxypropylene polyoxyethylene ether, C8-C14 isomeric alcohol polyoxypropylene polyoxyethylene ether, and C8-C18 fatty acid polyoxyethylene ester.

[0024] Furthermore, the low-foaming cleaning surfactant is an EO / PO block polyether;

[0025] The alkyl glycoside surfactant is selected from one or more of octyl glucoside, decyl glucoside, octyl / decyl glucoside, and lauryl glucoside;

[0026] Furthermore, the alkyl glycoside surfactant is octyl / decyl glucoside;

[0027] The amphoteric surfactant is selected from one or more of cocamidopropyl betaine, dodecyl betaine, dodecyl dimethylamine oxide, and lauramide propyl betaine.

[0028] The amphoteric surfactant is cocamidopropyl betaine.

[0029] Among them, EO / PO block polyether is mainly used to reduce foam and improve wettability in circulating liquid supply; octyl / decyl glucoside is used to improve green cleaning ability and the ability to remove glass surface debris; cocamidopropyl betaine is used to enhance the interface regulation ability under different pH conditions and can participate in the particle destabilization process in the waste liquid treatment stage.

[0030] Preferably, the weak alkaline lubricating and rust-preventing component includes a water-soluble lubricating coolant, a multi-metal rust inhibitor, and a pH buffer component;

[0031] The water-soluble lubricating coolant is selected from one or more of polyethylene glycol, polyether polyol, glycerol, water-soluble synthetic ester, and triethanolamine oleate;

[0032] Furthermore, the water-soluble lubricating coolant includes polyethylene glycol and polyether polyol.

[0033] More preferably, the polyethylene glycol is polyethylene glycol 400, and the mass ratio of polyethylene glycol 400 to polyether polyol is 4:3.

[0034] Preferably, the multi-metal rust inhibitor comprises an amino alcohol, a C8-C12 dicarboxylate, and a borate ester; wherein the mass ratio of the amino alcohol, the C8-C12 dicarboxylate, and the borate ester is (1-5):(0.5-3):(0.2-2).

[0035] Furthermore, the amino alcohol is one or more of triethanolamine, diethanolamine, monoethanolamine, and 2-amino-2-methyl-1-propanol, with triethanolamine being the most preferred.

[0036] Furthermore, the C8-C12 dicarboxylate is one or more of sebacate, dodecanoate, and undecanoate, with sebacate being the most preferred.

[0037] Triethanolamine can adjust the weak alkalinity of the system and assist in rust prevention of steel; C8-C12 dicarboxylic acids can form an adsorption protective layer on the surface of metals such as steel; borate esters can improve the corrosion inhibition of aluminum and also have a certain lubricating effect. The combination of the three can improve the compatibility of the suspension with various equipment materials such as steel, aluminum, and gray cast iron.

[0038] The pH buffer is selected from one or more of triethanolamine, sodium carbonate, sodium bicarbonate, borate buffer, and amino alcohol buffer.

[0039] Furthermore, the pH buffer adjuster includes triethanolamine and sodium bicarbonate.

[0040] More preferably, the mass ratio of triethanolamine to sodium bicarbonate is 4:1.

[0041] The pH buffer adjuster is used to stabilize the pH of the suspension at 9.0–9.5, preferably 9.1–9.3, and most preferably 9.2. The introduction of sodium bicarbonate helps to coordinate with the CO2-triggered destabilization process, enabling the system to be gently reduced to near neutral during the wastewater treatment stage.

[0042] Preferably, the defoamer is selected from one or more of polyether-modified siloxane defoamers, organosilicon defoamers, and polyether defoamers.

[0043] Furthermore, the defoamer is a polyether-modified siloxane defoamer;

[0044] The bactericide and preservative are selected from one or more of isothiazolinone bactericides, benzisothiazolinone bactericides, and bromonitol preservatives.

[0045] Secondly, the present invention provides a method for preparing an environmentally friendly optical glass suspension, the method comprising:

[0046] S1. Take the first part of water, add thixotropic suspending agent under stirring conditions of 25-45℃ and 300-800r / min, stir for 30-90min to fully hydrate the thixotropic suspending agent and obtain the thixotropic suspending agent pre-hydrated liquid;

[0047] S2. Take the second portion of water, add the nanosheet suspending agent, and disperse at 1000-3000 r / min for 20-60 min to obtain a nanosheet suspending dispersion;

[0048] S3. Add the nanosheet suspension aid dispersion obtained in S2 to the thixotropic suspending agent prehydrated solution obtained in S1, and stir at 400-1000 r / min for 30-60 min to obtain the basic suspension system;

[0049] S4. Add the particle interface conditioning component, low-foam cleaning and chip removal component, weak alkaline lubricating and rust-preventing component, water (part three), defoamer, and bactericide and preservative to the basic suspension system obtained in S3 in sequence. Stir at 100-1000 r / min for 60-180 min, adjust the pH of the system to 9.0-9.5, let it stand for 4-24 h, filter, and obtain an environmentally friendly optical glass suspension.

[0050] The water consists of three parts: the first part accounts for 40% to 65% of the total water mass, the second part accounts for 10% to 30% of the total water mass, and the third part is the remaining water.

[0051] Thirdly, the present invention provides the application of the environmentally friendly optical glass suspension in optical glass processing. The environmentally friendly optical glass suspension is used for the suspension, dispersion, conveying and cleaning of solid particles used in optical glass processing. The optical glass processing includes grinding, polishing or precision machining of optical glass, optical lenses, prisms or wafers.

[0052] The beneficial effects of this invention are:

[0053] 1. This invention achieves a synergistic suspension effect of "structural support—sheet support—particle hydration" through the compounding of thixotropic suspending components and particle interface regulating components. The thixotropic suspending agent provides recoverable low shear viscosity, the nanosheet suspending agent enhances the network spatial support capacity, and the particle interface regulating component forms a hydration protective layer on the surface of solid particles. Thus, it can simultaneously reduce the risks of particle sedimentation, agglomeration, and bottom hardening, while also ensuring fluidity under pumping, spraying, or grinding shear conditions.

[0054] 2. The particle interface regulating component and the low-foaming cleaning and chip removal component of the present invention work synergistically on the surface of solid particles and processing debris. The particle interface regulating component improves the dispersion stability of abrasive particles, while the low-foaming cleaning and chip removal component reduces the interfacial tension between abrasive particles, glass powder and the aqueous phase, enabling abrasive powder, glass powder and processing debris to be promptly carried away from the processing interface by the aqueous phase, thereby reducing cleaning residue and the risk of secondary scratches.

[0055] 3. This invention uses a low-foaming cleaning and chip removal component combined with a weak alkaline lubricating and rust-preventing component to improve the wetting and chip removal capabilities of the machining interface without generating a large amount of foam. At the same time, it reduces frictional heat and tool wear through the lubricating hydration film, and reduces the risk of corrosion of equipment components such as steel, aluminum, and gray cast iron by water-based machining fluids through the weak alkaline rust-preventing component.

[0056] 4. This invention utilizes components from the particle interface regulating component, the low-foaming cleaning and chip removal component, and the weakly alkaline lubricating and rust-preventing component to generate a reversible triggering destabilization effect. During the processing stage at pH 9.0–9.5, the solid particles remain stably suspended. After processing, CO2 is introduced into the waste liquid or a weakly acidic treatment agent is added to lower the pH of the system to 6.8–7.5. This weakens the surface charge of the solid particles, shrinks the hydration layer, and further induces bridging flocculation, thereby promoting the rapid settling of solid particles, glass powder, and processing debris.

[0057] 5. This invention solves the problem of the difficulty in simultaneously achieving "stable suspension during use" and "rapid sedimentation during waste treatment" in traditional suspensions. The suspension exhibits stable dispersion, low-foaming cleaning, lubrication, and rust prevention during use, and can transform into a controllable flocculation and sedimentation state during waste treatment. Therefore, it helps reduce the load on waste filtration and sedimentation treatment, and improves the environmental applicability of optical glass processing fluids.

[0058] 6. The preparation method of the present invention first prepares a thixotropic suspending agent pre-hydrated liquid and a nanosheet-assisted suspension dispersion, then constructs a basic suspension, and finally adds a particle interface adjustment component, a low-foaming cleaning and chip removal component and a weak alkaline lubricating and rust-preventing component in sequence, which is conducive to the uniform dispersion of each component and the exertion of multi-level synergistic effects. Detailed Implementation

[0059] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Equivalent substitutions or conventional adjustments made by those skilled in the art to the types, amounts, and process conditions of components without departing from the essential concept of the present invention should all fall within the scope of protection of the present invention.

[0060] In this invention, unless otherwise specified, all component amounts are by mass percentage. The pH of the environmentally friendly optical glass suspension is measured using a pH meter at 25°C. The water used is preferably deionized water.

[0061] The solid particles used for optical glass processing described in this invention can be one or more of white fused alumina, alumina, cerium oxide, silicon dioxide, zirconium oxide, and silicon carbide. In the following examples, white fused alumina was used as a representative high-density solid particle for suspension testing to facilitate evaluation of suspension performance; however, this test does not imply that this invention is limited to the white fused alumina system.

[0062] Example Material Description

[0063] In the embodiments, the thixotropic suspension component is a combination of velan gum, gellan gum and lithium saponite, wherein velan gum and gellan gum are used as thixotropic suspending agents with a mass ratio of 2.4:1, and lithium saponite is used as a nanosheet suspending agent.

[0064] The particle interface conditioning component is a combination of sodium polyaspartate and sodium gluconate, with a mass ratio of 1:1.

[0065] The low-foaming cleaning and chip removal component is a combination of EO / PO block polyether, octyl / decyl glucoside and cocamidopropyl betaine, with a mass ratio of 4:2:1.

[0066] The weakly alkaline lubricating and rust-preventing component is a combination of polyethylene glycol 400, polyether polyol, triethanolamine, sebate, borate, and sodium bicarbonate. The mass ratio of polyethylene glycol 400 to polyether polyol is 4:3; the mass ratio of triethanolamine, sebate, and borate is 3:2:1.

[0067] The defoamer used is a polyether-modified siloxane defoamer; the bactericide and preservative used is isothiazolinone bactericide and preservative; and the water used is deionized water.

[0068] It should be noted that cocamidopropyl betaine, sodium polyaspartate, triethanolamine and sodium bicarbonate can each have two or more functions in this invention, and the amount added in the specific formula shall be based on the actual amount of feed. The above-mentioned functions are used to explain their mechanism of action in the system and do not mean that the same substance needs to be added repeatedly according to different functions.

[0069] Example 1. Preparation of an environmentally friendly optical glass suspension

[0070] Table 1

[0071]

[0072] The preparation method is as follows: Weigh each component according to the formula in Table 1, and divide the deionized water into three parts: Part 1, Part 2, and Part 3. Part 1 accounts for 55% of the total mass of deionized water, Part 2 accounts for 20% of the total mass of deionized water, and Part 3 is the remaining water.

[0073] S1. Take the first part of water, heat it to 35℃, and slowly add Vilan gum and gellan gum under stirring at 600r / min. Continue stirring for 60min to obtain the thixotropic suspension pre-hydrated liquid.

[0074] S2. Take the second portion of water, add lithium saponite, and disperse at high speed at 2000 r / min for 40 min to obtain a nanosheet-assisted suspension dispersion.

[0075] S3. Slowly add the nanosheet suspension to the thixotropic suspending agent prehydration solution and stir at 800 r / min for 45 min to obtain the basic suspension.

[0076] S4. Add sodium polyaspartate, sodium gluconate, EO / PO block polyether, octyl / decyl glucoside, cocamidopropyl betaine, polyethylene glycol 400, polyether polyol, triethanolamine, sebate, borate ester, sodium bicarbonate, and water (part III) sequentially to the basic suspension, and stir at 600 rpm for 60 min; then add polyether-modified siloxane defoamer and isothiazolinone bactericide and preservative, and stir at 300 rpm for 20 min; adjust the pH of the system to 9.2, let it stand for 12 h, and filter through a 100-mesh filtration to obtain an environmentally friendly optical glass suspension.

[0077] Example 2. Preparation of an environmentally friendly optical glass suspension

[0078] The difference from Example 1 is that the amount of velan gum was adjusted to 0.16%, gellan gum to 0.07%, and lithium saponite to 0.45%, while the rest were the same as in Example 1.

[0079] Example 3. Preparation of an environmentally friendly optical glass suspension

[0080] The difference from Example 1 is that the EO / PO block polyether was adjusted to 0.60%, octyl / decyl glucoside to 0.30%, cocamidopropyl betaine to 0.20%, and defoamer to 0.06%, while the rest were the same as in Example 1.

[0081] Example 4. Preparation of an environmentally friendly optical glass suspension

[0082] The difference from Example 1 is that the sodium polyaspartate was adjusted to 0.60%, cocamidopropyl betaine to 0.25%, and sodium bicarbonate to 0.30%, while the rest were the same as in Example 1.

[0083] Example 5. Preparation of an environmentally friendly optical glass suspension

[0084] Table 2

[0085]

[0086] The specific preparation method is the same as in Example 1, according to the formula in Table 2.

[0087] Comparative Example 1. Preparation of an environmentally friendly optical glass suspension

[0088] Comparative Example 1 is basically the same as Example 1, except that cocamidopropyl betaine is not added and an equal amount of deionized water is used to make up the difference. The other components and preparation methods are the same as those in Example 1.

[0089] Comparative Example 2. Preparation of an Environmentally Friendly Optical Glass Suspension

[0090] Comparative Example 2 is basically the same as Example 1, except that sodium polyaspartate is not added and is made up with an equal amount of deionized water. The other components and preparation methods are the same as those in Example 1.

[0091] Comparative Example 3. Preparation of an Environmentally Friendly Optical Glass Suspension

[0092] Comparative Example 3 is basically the same as Example 1, except that sodium bicarbonate is not added and an equal amount of deionized water is used to make up the difference. Triethanolamine is used to adjust the pH of the system to 9.2. The remaining components and preparation methods are the same as those in Example 1.

[0093] Comparative Example 4. Preparation of an Environmentally Friendly Optical Glass Suspension (IX)

[0094] The difference from Example 1 is that lithium soapstone was removed and replaced with an equal amount of deionized water.

[0095] Comparative Example 5. Preparation of an environmentally friendly optical glass suspension

[0096] The difference from Example 1 is that sodium polyaspartate and sodium gluconate are not added, and the mixture is made up with an equal amount of deionized water.

[0097] Comparative Example 6. Preparation of an Environmentally Friendly Optical Glass Suspension (XI)

[0098] The difference from Example 1 is that EO / PO block polyether, octyl / decyl glucoside and cocamidopropyl betaine were removed and replaced with deionized water.

[0099] Comparative Example 7. Preparation of an Environmentally Friendly Optical Glass Suspension

[0100] The difference from Example 1 is that triethanolamine, sebacic acid salt, and borate ester were removed, and the pH was adjusted to 9.2 with sodium carbonate alone.

[0101] Comparative Example 8. Preparation of an Environmentally Friendly Optical Glass Suspension (XIII)

[0102] The difference from Example 1 is that the sodium polyaspartate in Example 1 is replaced with an equal amount of sodium hexametaphosphate, and the cocamidopropyl betaine is replaced with an equal amount of EO / PO block polyether. Sodium bicarbonate is not added, and the system is made up with an equal amount of deionized water. At the same time, triethanolamine and sodium carbonate are used to adjust the pH of the system to 9.2. The remaining components and preparation methods are the same as in Example 1.

[0103] Comparative Example 9. Preparation of an Environmentally Friendly Optical Glass Suspension (XIV)

[0104] The formulation of this comparative example is exactly the same as that of Example 1, except that the preparation method is different.

[0105] Specifically, according to the formulation of Example 1, each component was weighed, and deionized water was added to the reactor all at once. Under stirring at 600 r / min, the following components were added in sequence: vegan gum, gellan gum, lithium saponite, sodium polyaspartate, sodium gluconate, EO / PO block polyether, octyl / decyl glucoside, cocamidopropyl betaine, polyethylene glycol 400, polyether polyol, triethanolamine, sebate, borate, sodium bicarbonate, polyether-modified siloxane defoamer, and bactericide and preservative. The mixture was stirred continuously for 120 min, the pH of the system was adjusted to 9.2, and the mixture was allowed to stand for 12 h. After filtration through a 100 mesh, the environmentally friendly optical glass suspension of Comparative Example 9 was obtained.

[0106] Performance testing methods

[0107] Suspension stability test: The suspensions obtained in each example and comparative example were diluted to 5% by mass, and then 12% by mass of white fused alumina particles with a D50 particle size of 5 μm were added. After stirring for 10 min, 100 mL of the mixture was placed in a 100 mL graduated cylinder and allowed to stand at 25 °C for 24 h. The presence of obvious stratification, hard sedimentation at the bottom, or agglomeration was observed, and the maximum difference in solid content between the upper, middle, and lower layers was recorded.

[0108] Rheological property testing: The viscosity of the product diluted to 5% by mass was measured using a rotational rheometer at 25°C, and the shear rate was recorded as 1 s. -1 and 100s -1 Viscosity at that time.

[0109] Foam, cleaning residue and lubrication cooling tests: Under the same stirring, rinsing and grinding conditions, foam height, foam elimination rate, number of residual particles on the K9 optical glass surface, grinding disc temperature rise and tool wear were measured respectively.

[0110] Rust and corrosion prevention test: steel and aluminum sheets were fully immersed at 55±2℃ for 24 hours and the corrosion was observed; gray cast iron test pieces were subjected to a 24-hour single-piece rust prevention test at 35±2℃ and the rust was observed.

[0111] CO2-triggered destabilization sedimentation test: A suspension containing 12% white corundum and simulated by grinding was used as processing waste liquid. CO2 was introduced into it to reduce the pH of the system from 9.0 to 9.5 to 6.8 to 7.5. The sedimentation rate and turbidity of the supernatant were recorded after 30 min, 60 min and 120 min respectively.

[0112] The performance test results are shown in Table 3-6.

[0113] Table 3

[0114]

[0115] As shown in Table 3, no obvious sedimentation or bottom hardening was observed in Examples 1 to 4 after 24 hours of standing, and the maximum difference in solid content was less than 4%. This indicates that the present invention can effectively maintain the uniform distribution of solid particles through the synergistic effect of thixotropic suspension components, particle interface adjustment components and nanosheet suspension aid structures.

[0116] In Comparative Example 2, without the addition of sodium polyaspartate, the maximum difference in solid content increased to 10.8%, and significant sedimentation occurred, indicating that sodium polyaspartate not only participates in the reversible triggering of destabilization but also plays an important role in the hydration and dispersion of solid particles during use. In Comparative Example 4, after removing lithium saponite, the maximum difference in solid content increased, indicating that the nanosheet suspending agent provides spatial support for the solid particles. In Comparative Example 5, after removing the particle interface regulating component, sedimentation was more pronounced, indicating that thixotropic suspension structures alone are insufficient to stabilize high-density solid particles.

[0117] Comparative Example 8 retained the conventional suspension and cleaning / rust prevention functions, and its suspension stability during use was comparable to that of Example 1, indicating that acceptable suspension performance can be achieved by combining conventional dispersants with thixotropic networks. However, this comparative example lacked the ability to subsequently trigger destabilization via CO2 (see Table 6), which precisely proves that the rapid sedimentation of the waste liquid in this invention is not generated by a normal suspension stabilization system, but is achieved synergistically by specific reversible triggering components. Comparative Example 9 used a one-time mixing preparation method, and the maximum difference in solid content was significantly increased, along with the high-shear viscosity, indicating that the stepwise prehydration and predispersion process is beneficial for forming a uniform basic suspension structure.

[0118] Table 4

[0119]

[0120] As shown in Table 4, Examples 1, 3, and 5 all have low foam height and high foam elimination rate, and fewer residual particles on the glass surface. This indicates that the low-foam cleaning and chip removal components can improve the removal effect of glass powder, abrasive powder, and processing debris while maintaining low-foam performance.

[0121] In Example 3, increasing the dosage of the low-foam cleaning chip removal component resulted in a decrease in the number of residual particles, indicating that the low-foam cleaning chip removal component directly contributes to the cleanliness of the processing interface.

[0122] In Comparative Example 1, although the foam index remained good after the addition of cocamidopropyl betaine, the number of residual particles increased, indicating that the amphoteric surfactant not only participates in the pH response but also promotes wetting, dispersion, and debris removal. In Comparative Example 6, after removing the low-foaming cleaning and chip removal component, the number of residual particles increased significantly, as did the grinding disc temperature rise and tool wear, indicating a synergistic effect at the processing interface between the low-foaming cleaning and chip removal component and the lubrication and cooling component. Comparative Example 8, while retaining the basic framework of the low-foaming cleaning and chip removal component, saw a decrease in its wetting and dispersion ability on the solid particle surface due to the replacement of the amphoteric surfactant with nonionic EO / PO block polyether, resulting in a higher number of residual particles than in Example 1. Simultaneously, the increased total amount of EO / PO block polyether led to increased foam and a slower defoaming rate. In Comparative Example 9, the uneven dispersion of components due to one-time mixing resulted in a decreased foam elimination rate and increased residue and temperature rise.

[0123] Table 5

[0124]

[0125] Table 5 shows that Examples 1 and 5 have good rust prevention and corrosion inhibition effects on steel, aluminum, and gray cast iron. In Comparative Example 7, after removing the multi-metal rust-inhibiting and corrosion-inhibiting components such as sebacic acid salts and borate esters, steel sheets, aluminum sheets, and gray cast iron all showed varying degrees of rust or darkening, indicating that the weakly alkaline lubricating rust-inhibiting component formed between triethanolamine, C8-C12 dicarboxylate, and borate esters plays an important role in the compatibility of multi-metal equipment.

[0126] Comparative Example 8 retained the multi-metallic rust-inhibiting and corrosion-inhibiting components, thus its rust-inhibiting performance was close to that of Example 1. This indicates that this comparative example is a relatively fair and functionally complete comparative example, rather than a simple incomplete system lacking rust-inhibiting function. Although Comparative Example 9 had the same formula, the uniformity of component dispersion decreased due to one-time mixing, resulting in slight local rust spots on the gray cast iron. This indicates that the preparation order also has a certain impact on the uniformity of the distribution of rust-inhibiting components.

[0127] Table 6

[0128]

[0129] As shown in Table 6, after CO2 treatment in Example 1, the system pH decreased to 7.2, the sedimentation rate reached 76% at 60 min and 88% at 120 min, and the turbidity of the supernatant decreased by 66% at 60 min, indicating that the present invention can achieve rapid solid-liquid separation in the waste liquid stage. In Example 4, after increasing the reversible triggering related components, the sedimentation rate reached 84% at 60 min and 93% at 120 min, indicating that the reversible triggering destabilization effect was enhanced.

[0130] Comparative Example 1, which does not contain cocamidopropyl betaine, showed a sedimentation rate of only 51% after 60 minutes of CO2 treatment, indicating that the pH-responsive interface regulating component has a significant effect on charge regulation and destabilization flocculation after CO2 triggering. Comparative Example 2, which does not contain sodium polyaspartate, showed a sedimentation rate of 45% after 60 minutes, indicating that the bridging environmentally friendly dispersing component makes a significant contribution to bridging flocculation in the waste liquid stage. Comparative Example 3, which does not contain sodium bicarbonate, showed a system pH that only dropped to 8.0 under the same CO2 treatment conditions, with a sedimentation rate of only 38% after 60 minutes, indicating that the CO2-responsive buffer component facilitates the system entering a suitable pH triggering window.

[0131] Although Comparative Example 8 possesses relatively complete suspension, cleaning, lubrication, and rust prevention functions, its sedimentation rate after CO2 treatment is significantly lower than that of Example 1 due to the replacement of the responsive structures of sodium polyaspartate, cocamidopropyl betaine, and sodium bicarbonate with non-responsive components. This indicates that the rapid sedimentation of the waste liquid in this invention is not generated by a conventional suspension stabilization system, but rather by a reversible triggered destabilization effect formed by some components of the particle interface adjustment component, the low-foaming cleaning and chip removal component, and the weakly alkaline lubricating and rust-preventing component. Comparative Example 9, after employing a one-time mixing preparation method, also showed a decrease in the triggered destabilization effect, indicating that the stepwise pre-hydration, pre-dispersion, and subsequent functional component compounding sequence of the preparation method is beneficial for forming a stable and triggerable destabilization synergistic structure.

[0132] As can be seen from the above embodiments and comparative examples, the present invention achieves good suspension stability, low-foam cleaning and chip removal properties, lubrication and cooling properties, and rust and corrosion inhibition properties in the optical glass processing stage through the synergistic combination of thixotropic suspension components, particle interface adjustment components, low-foam cleaning and chip removal components, and weak alkaline lubricating and rust-inhibiting components.

[0133] Meanwhile, this invention utilizes a reversible triggered destabilization effect generated by the combined action of some components, causing the suspension to destabilize, flocculate, and settle during the wastewater treatment stage after being triggered by CO2 or a weak acid. This solves the problem of traditional suspensions being "more stable during use, but more difficult to separate during wastewater treatment." Example data shows that this invention can balance suspension stability and wastewater treatment convenience in optical glass processing.

[0134] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. An environmentally friendly optical glass suspension, characterized in that, By mass percentage, it comprises the following components: 0.20%–1.20% thixotropic suspension component, 0.20%–1.80% particle interface conditioning component, 0.20%–1.60% low-foaming cleaning and chip removal component, 2.00%–8.50% weak alkaline lubricating and rust-preventing component, 0.01%–0.20% defoamer, 0.02%–0.20% bactericide and preservative, with the balance being water; the pH of the environmentally friendly optical glass suspension is 9.0–9.

5.

2. The environmentally friendly optical glass suspension according to claim 1, characterized in that, The thixotropic suspension component includes a thixotropic suspending agent and a nanosheet suspending agent; the thixotropic suspending agent is selected from one or more of vegan gum, gellan gum, xanthan gum, sodium alginate, and sodium carboxymethyl cellulose, and the nanosheet suspending agent is selected from one or more of lithium saponite, modified bentonite, nano-montmorillonite, attapulgite, and magnesium aluminum silicate.

3. The environmentally friendly optical glass suspension according to claim 1, characterized in that, The particle interface modulating component is selected from one or more of the following: sodium polyaspartate, polycarboxylate, low molecular weight sodium polyacrylate, sodium gluconate, sodium citrate, and methylglycine diacetate.

4. The environmentally friendly optical glass suspension according to claim 1, characterized in that, The low-foaming cleaning and chip removal components include low-foaming cleaning surfactants, alkyl glycoside surfactants, and amphoteric surfactants; the mass ratio of the low-foaming cleaning surfactants, alkyl glycoside surfactants, and amphoteric surfactants is (2-8):(1-4):(0.5-3).

5. The environmentally friendly optical glass suspension according to claim 4, characterized in that, The low-foaming cleaning surfactant is selected from one or more of the following: EO / PO block polyether, C8-C14 fatty alcohol polyoxypropylene polyoxyethylene ether, C8-C14 isomeric alcohol polyoxypropylene polyoxyethylene ether, and C8-C18 fatty acid polyoxyethylene ester. The alkyl glycoside surfactant is selected from one or more of octyl glucoside, decyl glucoside, octyl / decyl glucoside, and lauryl glucoside; The amphoteric surfactant is selected from one or more of cocamidopropyl betaine, dodecyl betaine, dodecyl dimethylamine oxide, and lauramide propyl betaine.

6. The environmentally friendly optical glass suspension according to claim 1, characterized in that, The weakly alkaline lubricating and rust-preventing component includes a water-soluble lubricating coolant, a multi-metal rust inhibitor, and a pH buffer component; the water-soluble lubricating coolant is selected from one or more of polyethylene glycol, polyether polyol, glycerol, water-soluble synthetic ester, and triethanolamine oleate; the multi-metal rust inhibitor includes amino alcohols, C8-C12 dicarboxylic acids, and borate esters; the pH buffer is selected from one or more of triethanolamine, sodium carbonate, sodium bicarbonate, borate buffer, and amino alcohol buffer.

7. The environmentally friendly optical glass suspension according to claim 1, characterized in that, The defoamer is selected from one or more of polyether-modified siloxane defoamers, organosilicon defoamers, and polyether defoamers.

8. The environmentally friendly optical glass suspension according to claim 1, characterized in that, The bactericide and preservative are selected from one or more of isothiazolinone bactericides, benzisothiazolinone bactericides, and bromonitol preservatives.

9. A method for preparing an environmentally friendly optical glass suspension, used to prepare the environmentally friendly optical glass suspension according to any one of claims 1-8, characterized in that, The preparation method includes: S1. Take the first part of water, add thixotropic suspending agent under stirring conditions of 25-45℃ and 300-800r / min, stir for 30-90min to fully hydrate the thixotropic suspending agent and obtain the thixotropic suspending agent pre-hydrated liquid; S2. Take the second portion of water, add the nanosheet suspending agent, and disperse at 1000-3000 r / min for 20-60 min to obtain a nanosheet suspending dispersion; S3. Add the nanosheet suspension aid dispersion obtained in S2 to the thixotropic suspending agent prehydrated solution obtained in S1, and stir at 400-1000 r / min for 30-60 min to obtain the basic suspension system; S4. Add the particle interface conditioning component, low-foam cleaning and chip removal component, weak alkaline lubricating and rust-preventing component, water (part three), defoamer, and bactericide and preservative to the basic suspension system obtained in S3 in sequence. Stir at 100-1000 r / min for 60-180 min, adjust the pH of the system to 9.0-9.5, let it stand for 4-24 h, filter, and obtain an environmentally friendly optical glass suspension. The water consists of three parts: the first part accounts for 40% to 65% of the total water mass, the second part accounts for 10% to 30% of the total water mass, and the third part is the remaining water.

10. The application of the environmentally friendly optical glass suspension as described in any one of claims 1 to 9 in optical glass processing, characterized in that, The environmentally friendly optical glass suspension is used for the suspension, dispersion, conveying, and cleaning of solid particles used in optical glass processing, which includes grinding, polishing, or precision machining of optical glass, optical lenses, prisms, or wafers.

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