A hard water resistant resin composition and a method for preparing the same

Abstract

The present application relates to the technical field of glove finishing agent, in particular to a hard water resistant resin composition and a preparation method thereof, which comprises the following raw materials by weight: 500-650 parts of water, 3-8 parts of dispersing agent, 60-90 parts of wax powder, 1-5 parts of defoaming agent, 60-100 parts of polyurethane resin, 10-30 parts of hand feel agent, 10-30 parts of thickening agent, 5-15 parts of multifunctional additive, 20-60 parts of non-silicone wetting agent, 0.1-2 parts of bactericide, the selection and cooperation of each raw material in the optimized system form a stable emulsion paint, which remains stable and does not break emulsion under the condition of >=95 DEG C, allows the use of hard water or tap water, reduces the processing cost, and meets the continuous production demand.

Description

Technical Field

[0001] This invention relates to the field of glove coating technology, specifically to a hard water resistant resin composition and its preparation method. Background Technology

[0002] PVC (polyvinyl chloride) gloves are made by immersing a glove mold in a PVC paste resin slurry and then curing it. Without treatment, the PVC material itself is self-adhesive, making it difficult to demold during production. After packaging, the inner surface of the gloves will stick together, making them inconvenient to wear. Currently, powdered or powder-free coatings are often applied to the surface of PVC gloves, followed by a very thin layer of PU (polyurethane) coating on the inner surface to prevent sticking. Existing water-based polyurethane coatings are prone to demulsification at high temperatures of 70-80℃, resulting in white spots on the glove surface. Soft water is also required to avoid demulsification caused by calcium and magnesium ions, increasing production costs and energy consumption. Chinese patent application (publication number CN107337995A) discloses a high-temperature resistant water-based polyurethane coating and its application method, mainly by adding high-temperature resistant resin, wetting agent, filler, and polyvinyl alcohol to the coating to improve the demulsification problem. However, the introduction of polyether siloxane affects the product's hard water resistance to some extent. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a hard water resistant resin composition that optimizes the selection and formulation of raw materials in the system to form a stable emulsion coating. This coating remains stable and does not break down under conditions of ≥95°C, allowing the use of hard water or tap water, reducing processing costs, and meeting the needs of continuous production.

[0004] The present invention provides a water-resistant resin composition, comprising, by weight, at least the following raw materials: 500-650 parts water, 3-8 parts dispersant, 60-90 parts wax powder, 1-5 parts defoamer, 60-100 parts polyurethane resin, 10-30 parts hand feel agent, 10-30 parts thickener, 5-15 parts multifunctional additive, 20-60 parts non-organosilicon wetting agent, and 0.1-2 parts bactericide.

[0005] In one embodiment, the amount of non-organosilicon wetting agent added to the hard water resistant resin composition is 30-55 parts by weight.

[0006] In one embodiment, the non-organosilicon wetting agent comprises at least 2-propylheptanol ethoxylate.

[0007] The 2-propylheptanol ethoxylate is designated as WINK 061 and is sourced from Jingzhijie (Beijing) Technology Co., Ltd.

[0008] This invention optimizes the system by introducing a non-organosilicon wetting agent, which, in conjunction with other raw materials in the system, significantly enhances the hard water resistance of the product, effectively preventing demulsification caused by calcium and magnesium ions and ensuring product quality.

[0009] In one embodiment, the dispersant comprises at least an amino acid ester copolymer solution.

[0010] The amino acid ester copolymer solution is branded CFC-6530 and is sourced from Lubrizol.

[0011] In one embodiment, the D50 of the wax powder is 1-30 μm.

[0012] In one embodiment, the D50 of the wax powder is 8-18 μm.

[0013] The wax powder is oxidized PE wax, model OPE-18, sourced from Shanghai Tongshi Technology Co., Ltd.

[0014] In one embodiment, the defoamer comprises at least a nonionic emulsified silicone oil.

[0015] The nonionic emulsified silicone oil is model B62 and is sourced from Tianjin Maike Industry & Trade Co., Ltd.

[0016] In one embodiment, the polyurethane resin is selected from waterborne silicone-modified polyurethane.

[0017] In one embodiment, the viscosity of the waterborne silicone-modified polyurethane is <500 centipoise (2# rotor, 60 rpm, 25°C).

[0018] The waterborne silicone-modified polyurethane is model DR-755 and is sourced from Shanghai Pulide Industrial Co., Ltd.

[0019] In one embodiment, the feel agent comprises an ultra-high molecular weight organosilicon dispersion.

[0020] The ultra-high molecular weight organosilicon dispersion is model FE-8213 and is sourced from Guangzhou Duojin New Materials Technology Co., Ltd.

[0021] In one embodiment, the thickener is selected from at least one of cellulose ether thickeners, alkali-swellable thickeners, hydrophobically modified alkali-swellable thickeners, associative thickeners, or inorganic thickeners.

[0022] In one embodiment, the alkali-swellable thickener includes at least a polyacrylic acid alkali-swellable thickener.

[0023] The polyacrylic acid alkali-swellable thickener is model AT-935 and is sourced from Huateng Jichun Technology Co., Ltd.

[0024] In one embodiment, the multifunctional adjuvant is selected from at least one of 2-amino-2-methyl-1-propanol (AMP), triethylamine (TEA), or dimethylethanolamine (DMEA).

[0025] In one embodiment, the bactericide is selected from isothiazolinones or formaldehyde releasers.

[0026] In one embodiment, the bactericide is isothiolinone, model TNB-5, sourced from Nanjing Tianshilandun Biotechnology Co., Ltd.

[0027] Another aspect of the present invention provides a method for preparing a water-resistant resin composition, comprising at least the following steps: adding 70-80% by weight of water to a container, and sequentially adding a dispersant, wax powder and defoamer and stirring to obtain a dispersion; mixing the remaining water with a hand-feeling agent to obtain a hand-feeling liquid; sequentially adding polyurethane resin and the hand-feeling liquid to the dispersion and stirring to obtain a mixture; and sequentially adding a thickener, a multifunctional additive, a non-organosilicon wetting agent and a bactericide to the mixture and stirring.

[0028] In one embodiment, the preparation method of the hard water resistant resin composition includes at least the following steps: adding 70-80% by weight of water to a container, adding a dispersant and stirring at 200-300 rpm for 5-10 min; increasing the stirring speed to 500-600 rpm, adding wax powder and stirring for 20-30 min; adding an antifoaming agent and stirring for 20-30 min to obtain a dispersion; mixing the remaining water with a hand-feeling agent to obtain a hand-feeling liquid; controlling the stirring speed at 500-600 rpm, adding polyurethane resin and stirring for 5-10 min, then adding the hand-feeling liquid and stirring for 20-30 min to obtain a mixture; adding a thickener to the mixture and stirring for 5-10 min at 800-1000 rpm; adding a multifunctional additive and stirring for 20-30 min at 1000-1300 rpm; and adding a non-organosilicon wetting agent and a bactericide and stirring for 30-40 min.

[0029] Based on the raw materials in the system, this invention further optimizes the preparation process and parameter control to ensure the full dispersion and stability of each component in the system, prevent local aggregation to form non-dispersible particles, maximize defoaming efficiency, and ensure the storage stability, application in construction and application of the product and its final film-forming performance.

[0030] Beneficial effects 1. This invention provides a hard water resistant resin composition, which optimizes the selection and combination of raw materials in the system to form a stable emulsion coating, which remains stable and does not break down under conditions of ≥95℃, allowing the use of hard water or tap water, reducing treatment costs and meeting the needs of continuous production.

[0031] 2. This invention optimizes the system by introducing a non-organosilicon wetting agent, which, in conjunction with other raw materials in the system, significantly enhances the hard water resistance of the product, effectively preventing demulsification caused by calcium and magnesium ions and ensuring product quality.

[0032] 3. Based on the raw materials in the system, this invention further optimizes the preparation process and parameter control to ensure the full dispersion and stability of each component in the system, prevent local aggregation to form non-dispersible particles, maximize defoaming efficiency, and ensure the storage stability, application in construction and final film-forming performance of the product.

[0033] 4. The water-resistant resin composition provided by the present invention can be effectively applied to the surface treatment of PVC gloves, effectively preventing PVC gloves from sticking together. Detailed Implementation

[0034] Example 1 Example 1 of the present invention provides a water-resistant resin composition, which, by weight, comprises the following raw materials: 590 parts water, 6 parts dispersant, 75 parts wax powder, 3.4 parts defoamer, 80 parts polyurethane resin, 20 parts hand feel agent, 20 parts thickener, 10 parts multifunctional additive, 30 parts non-organosilicon wetting agent, and 1 part bactericide.

[0035] The non-organosilicon wetting agent is 2-propylheptanol ethoxylate, and the model of the 2-propylheptanol ethoxylate is WINK 061, which is sourced from Jingzhijie (Beijing) Technology Co., Ltd.

[0036] The dispersant is an amino acid ester copolymer solution, the grade of which is CFC6530, and it is sourced from Lubrizol.

[0037] The wax powder has a D50 of 18μm and is an oxidized PE wax, model OPE-18, sourced from Shanghai Tongshi Technology Co., Ltd.

[0038] The defoamer is a nonionic emulsified silicone oil, specifically model B62, sourced from Tianjin Maike Industry & Trade Co., Ltd.

[0039] The polyurethane resin is a water-based silicone-modified polyurethane, and the model of the water-based silicone-modified polyurethane is DR-755, which is sourced from Shanghai Pulide Industrial Co., Ltd.

[0040] The feel-enhancing agent is an ultra-high molecular weight organosilicon dispersion, the model of which is FE-8213, and it originates from Guangzhou Duojin New Materials Technology Co., Ltd.

[0041] The thickener is an alkali-swellable thickener, specifically a polyacrylic acid alkali-swellable thickener, and the polyacrylic acid alkali-swellable thickener is designated as type 935, sourced from Huateng Jichun Technology Co., Ltd.

[0042] The multifunctional adjuvant is 2-amino-2-methyl-1-propanol (AMP).

[0043] The bactericide is isothiolinone, model TNB-5, sourced from Nanjing Tianshilandun Biotechnology Co., Ltd.

[0044] Example 1 of the present invention provides a method for preparing a water-resistant resin composition, comprising the following steps: adding 70% by weight of water to a container, adding a dispersant and stirring at 300 rpm for 5 min; increasing the stirring speed to 500 rpm, adding wax powder and stirring for 20 min; adding an antifoaming agent and stirring for 30 min to obtain a dispersion; mixing the remaining water with a hand-feeling agent to obtain a hand-feeling liquid; controlling the stirring speed at 500 rpm, adding polyurethane resin and stirring for 5 min, then adding the hand-feeling liquid and stirring for 30 min to obtain a mixture; adding a thickener to the mixture and stirring for 10 min at 800 rpm; adding a multifunctional additive and stirring for 20 min at 1100 rpm; adding a non-organosilicon wetting agent and a bactericide and stirring for 40 min.

[0045] Example 2 Example 2 of the present invention provides a water-resistant resin composition and its preparation method, the specific implementation of which is the same as that of Example 1, except that the amount of the non-organosilicon wetting agent is replaced with 35 parts by weight.

[0046] Example 3 Example 3 of the present invention provides a water-resistant resin composition and its preparation method, the specific implementation of which is the same as that of Example 1, except that the amount of the non-organosilicon wetting agent is replaced with 40 parts by weight.

[0047] Example 4 Example 4 of the present invention provides a water-resistant resin composition and its preparation method, the specific implementation of which is the same as that of Example 1, except that the amount of the non-organosilicon wetting agent is replaced with 45 parts by weight.

[0048] Example 5 Example 5 of the present invention provides a water-resistant resin composition and its preparation method, the specific implementation of which is the same as that of Example 1, except that the amount of the non-organosilicon wetting agent is replaced with 50 parts by weight.

[0049] Example 6 Example 6 of the present invention provides a water-resistant resin composition and its preparation method, the specific implementation of which is the same as that of Example 1, except that the amount of the non-organosilicon wetting agent is replaced with 55 parts by weight.

[0050] Comparative Example 1 Comparative Example 1 of the present invention provides a hard water resistant resin composition and its preparation method. The specific implementation method is the same as that of Example 1, except that the non-organosilicon wetting agent is replaced with an organosilicon wetting agent (polyether modified siloxane, model YMT-328, from Umet (Beijing) Environmental Materials Technology Co., Ltd.).

[0051] Comparative Example 2 Comparative Example 2 of the present invention provides a water-resistant resin composition and its preparation method, the specific implementation of which is the same as that of Comparative Example 1, except that the amount of the organosilicon wetting agent is replaced with 40 parts by weight.

[0052] Comparative Example 3 Comparative Example 3 of the present invention provides a water-resistant resin composition and its preparation method, the specific implementation of which is the same as that of Comparative Example 1, except that the amount of the organosilicon wetting agent is replaced with 25 parts by weight.

[0053] Comparative Example 4 Comparative Example 4 of the present invention provides a water-resistant resin composition and its preparation method. The specific implementation method is the same as that of Comparative Example 1, except that the amount of the organosilicon wetting agent is replaced with 40 parts by weight; the type of the organosilicon wetting agent is replaced with YMT-245, which is sourced from Umet (Beijing) Environmental Materials Technology Co., Ltd.

[0054] Comparative Example 5 Comparative Example 5 of the present invention provides a water-resistant resin composition and its preparation method. The specific implementation method is the same as that of Comparative Example 1, except that the amount of the organosilicon wetting agent is replaced with 40 parts by weight; the type of the organosilicon wetting agent is replaced with YMT-320, which is sourced from Umet (Beijing) Environmental Materials Technology Co., Ltd.

[0055] Comparative Example 6 Comparative Example 6 of the present invention provides a water-resistant resin composition and its preparation method. The specific implementation method is the same as that of Example 1, except that the 30 parts of the non-organosilicon wetting agent is replaced by a combination of 10 parts by weight of organosilicon wetting agent and 20 parts by weight of non-organosilicon wetting agent; the organosilicon wetting agent is of model YMT-328 and is sourced from Umet (Beijing) Environmental Materials Technology Co., Ltd.

[0056] Comparative Example 7 Comparative Example 7 of the present invention provides a hard water resistant resin composition and its preparation method. The specific implementation method is the same as that of Example 1, except that the 30 parts of the non-organosilicon wetting agent is replaced by a combination of 20 parts by weight of organosilicon wetting agent and 10 parts by weight of non-organosilicon wetting agent; the organosilicon wetting agent is model YMT-328, which is sourced from Umet (Beijing) Environmental Materials Technology Co., Ltd.

[0057] Comparative Example 8 Comparative Example 8 of the present invention provides a hard water resistant resin composition and its preparation method. The specific implementation method is the same as that of Example 1, except that the 30 parts of the non-organosilicon wetting agent is replaced with a combination of 15 parts by weight of organosilicon wetting agent and 15 parts by weight of non-organosilicon wetting agent; the organosilicon wetting agent is of model YMT-328 and is sourced from Umet (Beijing) Environmental Materials Technology Co., Ltd.

[0058] Performance testing The water-resistant resin compositions prepared in the examples and comparative examples were diluted 1:10 with water having a conductivity of 3500 uS / cm (the conductivity of tap water was adjusted with calcium nitrate tetrahydrate). The mixtures were placed on a heatable magnetic stirrer, and heating and stirring were turned on. The state of the samples was observed as the temperature increased until the material in the solution broke down. Heating and stirring were stopped, and the demulsification temperature (water-resistant temperature) and state were recorded. The results are shown in Table 1.

[0059] Table 1 Hard water temperature resistance state Example 1 96℃ The particle size increases, but recovers after cooling without affecting coating performance. Example 2 95℃ The particle size increases, but recovers after cooling without affecting coating performance. Example 3 98℃ The particle size increases, but recovers after cooling without affecting coating performance. Example 4 97℃ The particle size increases, but recovers after cooling without affecting coating performance. Example 5 96℃ The particle size increases, but recovers after cooling without affecting coating performance. Example 6 95.5℃ The particle size increases, but recovers after cooling without affecting coating performance. Comparative Example 1 65℃ Completely demulsified, resembling cottage cheese. Comparative Example 2 65℃ Completely demulsified, resembling cottage cheese. Comparative Example 3 65℃ Completely demulsified, resembling cottage cheese. Comparative Example 4 68℃ Completely demulsified, resembling cottage cheese. Comparative Example 5 67℃ Completely demulsified, resembling cottage cheese. Comparative Example 6 80℃ Larger particle size leads to emulsion instability Comparative Example 7 75℃ Larger particle size leads to emulsion instability Comparative Example 8 78℃ Larger particle size leads to emulsion instability Analysis of the data in Table 1 shows that Examples 1-6 of the present invention have a higher hard water resistance temperature compared to Comparative Examples 1-8.

Claims

1. A water-resistant resin composition, characterized in that, By weight, it comprises at least the following raw materials: 500-650 parts water, 3-8 parts dispersant, 60-90 parts wax powder, 1-5 parts defoamer, 60-100 parts polyurethane resin, 10-30 parts hand feel agent, 10-30 parts thickener, 5-15 parts multifunctional additive, 20-60 parts non-organosilicone wetting agent, and 0.1-2 parts bactericide; wherein the non-organosilicone wetting agent comprises at least 2-propylheptanol ethoxylate.

2. The water-resistant resin composition according to claim 1, characterized in that, The dispersant comprises at least an amino acid ester copolymer solution.

3. The water-resistant resin composition according to claim 1, characterized in that, The D50 of the wax powder is 1-30 μm.

4. The water-resistant resin composition according to claim 1, characterized in that, The defoamer includes at least nonionic emulsified silicone oil.

5. The water-resistant resin composition according to claim 1, characterized in that, The polyurethane resin is selected from waterborne silicone-modified polyurethane.

6. The hard water resistant resin composition according to claim 1, characterized in that, The feel agent includes an ultra-high molecular weight organosilicon dispersion.

7. The water-resistant resin composition according to claim 1, characterized in that, The thickener is selected from at least one of cellulose ether thickeners, alkali-swellable thickeners, hydrophobically modified alkali-swellable thickeners, associative thickeners, or inorganic thickeners.

8. The water-resistant resin composition according to claim 1, characterized in that, The multifunctional adjuvant is selected from at least one of 2-amino-2-methyl-1-propanol, triethylamine, or dimethylethanolamine.

9. A method for preparing a water-resistant resin composition according to any one of claims 1-8, characterized in that, The process includes at least the following steps: adding 70-80% of the total weight of water to a container, then adding dispersant, wax powder and defoamer in sequence and stirring to obtain a dispersion; mixing the remaining water with a hand-feeling agent to obtain a hand-feeling liquid; adding polyurethane resin and hand-feeling liquid in sequence to the dispersion and stirring to obtain a mixture; and adding thickener, multifunctional additive, non-organosilicone wetting agent and bactericide in sequence to the mixture and stirring.