Recyclable rubber release agent with high coating amount
By using high molecular weight pronicotinic polyether and ethylenediamine polyether combined with polypropylene glycol, a rubber release agent was prepared that increases coating amount at high temperatures, improves insertion and extraction properties, and enhances the fluidity of the recycled liquid. This solves the problem of balancing coating amount and recyclability, achieving the dual goals of environmental protection and production efficiency.
Patent Information
- Application Number
- CN202511856641.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-02-17
AI Technical Summary
Existing rubber release agents cannot simultaneously achieve good coating coverage and recyclability at high temperatures, resulting in poor insertion and extraction properties and difficulty in recycling and reuse, thus failing to meet the dual requirements of environmental protection and production efficiency.
Pronico polyether and ethylenediamine polyether with molecular weights above 3000 are used as the main components, and polypropylene glycol is added to improve its gel state and increase the fluidity of the recycled liquid, so as to prepare a rubber release agent with high coating amount that can be recycled.
Increasing the coating amount at high temperatures improves insertion and extraction properties, and the recovered release agent liquid has good fluidity, making it easy to reuse and meeting the requirements of environmental protection and production efficiency.
Smart Images
Figure CN121537596A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of rubber processing, in particular to a rubber release agent with high coating amount and recyclable use. BACKGROUND
[0002] A large number of special-shaped rubber hoses are used in automobiles, and these rubber hoses need to be processed through a process called vulcanization before use. Rubber vulcanization is a process in which linear rubber macromolecules form a three-dimensional network structure of macromolecules through chemical cross-linking action by a vulcanizing agent. The physical properties of vulcanized rubber are stable, the use temperature range is expanded, and it has excellent properties such as high strength, high elasticity, high wear resistance, corrosion resistance, etc.
[0003] The vulcanization processing of the rubber hose requires inserting the raw rubber hose into a curved metal core rod (mold), shaping the rubber hose through various curved core rods, and vulcanizing it in a high-temperature vulcanization tank at about 150-180℃ for about 30 minutes. The insertion and removal of the rubber hose are done manually, so in order to save labor and avoid damage to the surface of the rubber hose, a release agent needs to be applied to the core rod to ensure smooth insertion and removal of the core rod during production and improve production efficiency. Such a lubricant is a rubber release agent. In addition to reducing the physical burden of workers, an excellent rubber release agent also needs to protect the core rod to extend its service life, and the residual release agent on the rubber hose is easy to clean and meets environmental protection requirements.
[0004] The mainstream release agent on the market is a water-based release agent. Most water-based release agents have reduced viscosity and improved flowability when exposed to high temperatures, resulting in less residue on the hot core rod, so the workability of high-temperature insertion and removal is relatively poor. Some water-based release agents have increased viscosity after high-temperature exposure, which improves the residue on the core rod and makes the insertion and removal better, but the used release agent becomes a gel without flowability. With the increasing demand for production cost control and environmental protection, the demand for recycling of the release agent that drips after use is increasing. Excellent insertion and removal release performance alone cannot meet the needs of all enterprises. There is a need in the market for the development of an environmentally friendly water-based release agent with moderate viscosity, flowability after use, and recyclability after recycling. SUMMARY
[0005] The present application mainly solves the technical problem that the high coating amount and recyclability cannot be considered in the prior art, and provides a rubber release agent with high coating amount and recyclable use to solve the problems in the background art.
[0006] The present application provides a rubber release agent with high coating amount and recyclable use, according to weight parts:
[0007]
[0008] As a preference, the polyether of propylene glycol is at least one compound of the following general formula (1),
[0009] HO(CH2CH2O) a -(CH2CH(CH3)O) b -(CH2CH2O) c H(1)
[0010] In formula (1), a = 1-40, b = 1-70, c = 1-40.
[0011] As a preference, the polyether of ethylenediamine is at least one compound of the following general formula (2),
[0012]
[0013] In formula (2), a = 1-20, b = 1-20, c = 1-20, d = 1-20, e = 1-20, f = 1-20, g = 1-20, h = 1-20.
[0014] As a preference, the polypropylene glycol has a molecular weight range of 200-2000.
[0015] As a preference, the polyether of propylene glycol and the polyether of ethylenediamine have a molecular weight range of 3000-10000.
[0016] Advantages of the present application:
[0017] (1) The polyether of propylene glycol and the polyether of ethylenediamine used in the present application have a molecular weight of 3000 or more, and the polyether of this molecular weight has good high-temperature resistance.
[0018] (2) The polyether of propylene glycol used in the present application has a relatively high proportion of propylene oxide in its molecular structure, and thus has poor water solubility. When the water solution of the release agent containing this polyether encounters a hot core rod, the polyether forms a gel-like structure in the water as the water evaporates, causing the water solution to thicken. This results in more release agent working solution remaining on the core rod and an increase in the coating amount.
[0019] (3) The polyether of ethylenediamine used in the present application has a proportion of ethylene oxide and propylene oxide in its molecular structure, and thus has a unique property. When the water solution of the release agent containing this polyether encounters a hot core rod, the water solution of the release agent turns white, its viscosity increases, its flowability on the hot core rod deteriorates, more remains, and the coating amount increases.
[0020] (4) The polypropylene glycol used in the present application has good solubilizing effect and can improve the gel state of the polyether of propylene glycol. By adding the polypropylene glycol, the gel-like degree of the release agent recovery liquid after use is significantly reduced or even disappears at room temperature, thereby improving the flowability of the recovery liquid and facilitating recovery and reuse. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 A schematic diagram of the experimental and judging method for the insertion and extraction in the present application;
[0022] Figure 2 A schematic diagram of the evaluation method for the coating amount in the present application;
[0023] Figure 3 A schematic diagram of the evaluation method for the recovery flowability in the present application. DETAILED DESCRIPTION
[0024] The technical solutions of the present application are further specifically described below by examples in combination with the drawings.
[0025] Comparative Example 1: A rubber release agent with high coating amount and recyclable use, according to weight parts: Pluronic polyether 3 parts;
[0026] Ethylene diamine polyether 55 parts;
[0027] Polypropylene glycol 400 15 parts;
[0028] Water 27 parts;
[0029] The molecular structure formula of the above-mentioned Pluronic polyether is:
[0030] HO(CH2CH2O)4-(CH2CH(CH3)O) 56 -(CH2CH2O)4H
[0031] The molecular structure formula of the above-mentioned ethylene diamine polyether is:
[0032]
[0033] A preparation method of a rubber release agent with high coating amount and recyclable use, comprising the following steps:
[0034] 1) Add 3 parts of Pluronic polyether and 55 parts of ethylene diamine polyether into a reaction kettle, and fully stir to be uniform.
[0035] 2) Add 15 parts of polypropylene glycol 400 and 27 parts of water into the mixture of step 1) to stir, so that
[0036] they are dispersed uniformly. Remove impurities by filtration to obtain the product.
[0037] Comparative Example 2: A rubber release agent with high coating amount and recyclable use, according to weight parts:
[0038]
[0039] The molecular structure formula of the above-mentioned Pluronic polyether is:
[0040] HO(CH2CH2O) 12 -(CH2CH(CH3)O) 38 -(CH2CH2O) 12 H
[0041] The molecular structure of the above polyether is:
[0042]
[0043] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0044] 1) 25 parts of polyether and 50 parts of polyether are added into a reaction kettle, and fully stirred and uniformly mixed.
[0045] 2) 15 parts of polypropylene glycol 1000 and 10 parts of water are added into the mixture of step 1) and stirred to uniformly disperse. Impurities are removed by filtration, and the product is obtained.
[0046] Comparative Example 3: A high-coating rubber release agent for recycling use, according to parts by weight:
[0047] The molecular structure of the above polyether is:
[0048] HO(CH2CH2O) 15 -(CH2CH(CH3)O) 68 -(CH2CH2O) 15 H
[0049] The molecular structure of the above polyether is:
[0050]
[0051] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0052] 1) 20 parts of polyether and 60 parts of polyether are added into a reaction kettle, and fully stirred and uniformly mixed.
[0053] 2) 5 parts of polypropylene glycol 1000 and 15 parts of water are added into the mixture of step 1) and stirred to uniformly disperse. Impurities are removed by filtration, and the product is obtained.
[0054] Comparative Example 4: A high-coating rubber release agent for recycling use, according to parts by weight:
[0055] The molecular structure of the above polyether is:
[0056] HO(CH2CH2O) 11 -(CH2CH(CH3)O) 68 -(CH2CH2O) 11 H
[0057] The molecular structure of the above polyether is:
[0058]
[0059] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0060] 1) 5 parts of polyether and 55 parts of polyether are added to the reaction kettle, and fully stirred and uniformly mixed.
[0061] 2) 25 parts of polypropylene glycol 400 and 15 parts of water are added to the mixture of step 1) and stirred to disperse uniformly. Impurities are removed by filtration to obtain the product.
[0062] Comparative Example 5: A high-coating rubber release agent for recycling use, according to parts by weight:
[0063] The molecular structure of the above polyether is:
[0064] HO(CH2CH2O) 25 -(CH2CH(CH3)O) 48 -(CH2CH2O) 25 H
[0065] The molecular structure of the above polyether is:
[0066]
[0067] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0068] 1) 20 parts of polyether and 45 parts of polyether are added to the reaction kettle, and fully stirred and uniformly mixed.
[0069] 2) 20 parts of polypropylene glycol 400 and 15 parts of water are added to the mixture of step 1) and stirred to disperse uniformly. Impurities are removed by filtration to obtain the product.
[0070] Comparative Example 6: A high-coating rubber release agent for recycling use, according to parts by weight:
[0071] The molecular structure of the above polyether is:
[0072] HO(CH2CH2O) 21 -(CH2CH(CH3)O) 53 -(CH2CH2O) 21 H
[0073] The molecular structure of the above-mentioned polyether is:
[0074]
[0075] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0076] 1) 5 parts of polyether and 65 parts of polyether are added to the reaction kettle, and fully stirred and uniformly mixed.
[0077] 2) 20 parts of polypropylene glycol 400 and 10 parts of water are added to the mixture of step 1) and stirred to disperse uniformly. Impurities are removed by filtration to obtain the product.
[0078] Example 1: A high-coating rubber release agent for recycling use, according to the weight fraction:
[0079] The molecular structure of the above-mentioned polyether is:
[0080] HO(CH2CH2O) 26 -(CH2CH(CH3)O) 56 -(CH2CH2O) 26 H
[0081] The molecular structure of the above-mentioned polyether is:
[0082]
[0083] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0084] 1) 20 parts of polyether and 60 parts of polyether are added to the reaction kettle, and fully stirred and uniformly mixed.
[0085] 2) 10 parts of polypropylene glycol 1000 and 10 parts of water are added to the mixture of step 1) and stirred to disperse uniformly. Impurities are removed by filtration to obtain the product.
[0086] Example 2: A high-coating rubber release agent for recycling use, according to the weight fraction:
[0087] The molecular structure of the above-mentioned polyether is:
[0088] HO(CH2CH2O) 35 -(CH2CH(CH3)O) 33 -(CH2CH2O) 35 H
[0089] The molecular structure of the above polyether is:
[0090]
[0091] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0092] 1) 20 parts of polyether and 57 parts of polyether are added to the reaction kettle, and fully stirred and uniformly mixed.
[0093] 2) 10 parts of polypropylene glycol 400 and 13 parts of water are added to the mixture of step 1) and stirred to disperse uniformly. Impurities are removed by filtration to obtain the product.
[0094] Example 3: A high-coating rubber release agent for recycling use, according to the weight fraction:
[0095]
[0096]
[0097] The molecular structure of the above polyether is:
[0098] HO(CH2CH2O) 15 -(CH2CH(CH3)O) 65 -(CH2CH2O) 15 H
[0099] The molecular structure of the above polyether is:
[0100]
[0101] A preparation method of a high-coating rubber release agent for recycling use, comprising the following steps:
[0102] 1) 20 parts of polyether and 57 parts of polyether are added to the reaction kettle, and fully stirred and uniformly mixed.
[0103] 2) 10 parts of polypropylene glycol 400 and 13 parts of water are added to the mixture of step 1) and stirred to disperse uniformly. Impurities are removed by filtration to obtain the product.
[0104] Example 4: A high-coating rubber release agent for recycling use, according to the weight fraction:
[0105] The molecular structure of the above-mentioned polyether is:
[0106] HO(CH2CH2O) 10 -(CH2CH(CH3)O) 70 -(CH2CH2O) 10 H
[0107] The molecular structure of the above-mentioned polyether is:
[0108]
[0109] A method for preparing a rubber release agent with high coating amount and recyclable use comprises the following steps:
[0110] 1) 15 parts of polyether and 60 parts of polyether are added to a reaction kettle, and fully stirred and uniformly mixed.
[0111] 2) 20 parts of polypropylene glycol 400 and 5 parts of water are added to the mixture of step 1) and stirred to uniformly disperse. Impurities are removed by filtration, and the product is obtained.
[0112] Example 5: A rubber release agent with high coating amount and recyclable use, according to the weight fraction:
[0113] The molecular structure of the above-mentioned polyether is:
[0114] HO(CH2CH2O) 30 -(CH2CH(CH3)O) 50 -(CH2CH2O) 30 H
[0115] The molecular structure of the above-mentioned polyether is:
[0116]
[0117] A method for preparing a rubber release agent with high coating amount and recyclable use comprises the following steps:
[0118] 1) 10 parts of polyether and 60 parts of polyether are added to a reaction kettle, and fully stirred and uniformly mixed.
[0119] 2) 10 parts of polypropylene glycol 400 and 20 parts of water are added to the mixture of step 1) and stirred to uniformly disperse. Impurities are removed by filtration, and the product is obtained.
[0120] Example 6: A rubber release agent with high coating amount and recyclable use, according to the weight fraction:
[0121] The molecular structure of the above-mentioned polyether is:
[0122] HO(CH2CH2O) 50 -(CH2CH(CH3)O) 40 -(CH2CH2O) 50 H
[0123] The molecular structure of the above-mentioned polyether is:
[0124]
[0125] A method for preparing a rubber release agent with high coating amount and recyclable use comprises the following steps:
[0126] 1) 10 parts of polyether and 60 parts of polyether are added to a reaction kettle, and fully stirred and uniformly mixed.
[0127] 2) 15 parts of polypropylene glycol 400 and 15 parts of water are added to the mixture of step 1) and stirred to uniformly disperse. Impurities are removed by filtration, and the product is obtained.
[0128] Example 7: A rubber release agent with high coating amount and recyclable use, according to parts by weight:
[0129]
[0130]
[0131] The molecular structure of the above-mentioned polyether is:
[0132] HO(CH2CH2O) 55 -(CH2CH(CH3)O) 45 -(CH2CH2O) 55 H
[0133] The molecular structure of the above-mentioned polyether is:
[0134]
[0135] A method for preparing a rubber release agent with high coating amount and recyclable use comprises the following steps:
[0136] 1) 20 parts of polyether and 50 parts of polyether are added to a reaction kettle, and fully stirred and uniformly mixed.
[0137] 2) 15 parts of polypropylene glycol 400 and 15 parts of water are added to the mixture of step 1) and stirred to uniformly disperse. Impurities are removed by filtration, and the product is obtained.
[0138] Example 8: A high-coat-volume recyclable rubber release agent, in parts by weight:
[0139] The molecular structure of the above polyol polyether is:
[0140] HO(CH2CH2O) 25 -(CH2CH(CH3)O) 60 -(CH2CH2O) 25 H
[0141] The molecular structure of the above polyol polyether is:
[0142]
[0143] A method for preparing a high-coat-volume recyclable rubber release agent, comprising the following steps:
[0144] 1) Add 20 parts of polyol polyether and 50 parts of ethylenediamine polyether to a reaction kettle and fully stir to uniformity.
[0145] 2) Add 20 parts of polypropylene glycol 400 and 10 parts of water to the mixture of step 1) and stir to disperse uniformity. Filter to remove impurities, and the product is obtained.
[0146] Example 9: A high-coat-volume recyclable rubber release agent, in parts by weight:
[0147] The molecular structure of the above polyol polyether is:
[0148] HO(CH2CH2O) 15 -(CH2CH(CH3)O) 65 -(CH2CH2O) 15 H
[0149] The molecular structure of the above polyol polyether is:
[0150]
[0151] A method for preparing a high-coat-volume recyclable rubber release agent, comprising the following steps:
[0152] 1) Add 20 parts of polyol polyether and 50 parts of ethylenediamine polyether to a reaction kettle and fully stir to uniformity.
[0153] 2) Add 20 parts of polypropylene glycol 1000 and 10 parts of water to the mixture of step 1) and stir to disperse uniformity. Filter to remove impurities, and the product is obtained.
[0154] Experimental method:
[0155] Figure 2 Evaluation method of coating amount:
[0156] First, the mandrel is weighed W0, then heated to 150°C, and the release agent working solution is applied to the hot mandrel. When the working solution on the mandrel stops flowing, weigh it and record W1. The coating amount is W1-W0=W2. Figure 3 Evaluation method of recovery fluidity:
[0157] Apply 4ml of release agent working solution to the 150°C mandrel. The release agent working solution flows to the bottom tray after passing through the hot mandrel. The tray is inclined at an angle of 5°, allowing the working solution in the tray to flow down. Record the time when the working solution flows to the bottom of the tray.
[0158] When the laboratory plug-in hand feel score is 4 points, the coating amount is more than 0.8g, the on-site evaluation is smooth, and it meets the customer's requirements; when the recovery liquid flow time is less than 1h, it meets the customer's requirements for the fluidity of the recovery liquid.
[0159] Summary of test data:
[0160]
[0161]
[0162]
[0163] Example 10: Use the recovered liquid obtained from Example 2 to confirm the plug-in performance.
[0164] Example 11: Mix the recovered liquid obtained from Example 2 and the newly prepared working liquid of Example 2 at a ratio of 50:50, and then confirm the plug-in performance.
[0165] Example 12: Mix the recovered liquid obtained from Example 2 and the newly prepared working liquid of Example 7 and water at a ratio of 33:33:34, and then confirm the plug-in performance.
[0166] After the above experiments, the recovered liquid is used as a release agent by mixing it with the new release agent working liquid, and the performance of the recovered liquid is confirmed. The following table shows that the performance of the recovered liquid can meet the requirements. The reutilization evaluation results are as follows:
[0167]
Claims
1. A high-coat-weight recyclable rubber release agent characterized by comprise the following in parts by weight:
2. A high-coat-weight recyclable rubber release agent according to claim 1, characterized in that: The polyether polyols are at least one compound of the following general formula (1), HO(CH2CH2O) a -(CH2CH(CH3)O) b -(CH2CH2O) C H(1) In formula (1), a = 1 to 40, b = 1 to 70, and c = 1 to 40.
3. A high-coat-weight recyclable rubber release agent according to claim 1, characterized in that: The ethylene diamine polyether is at least one compound of the following general formula (2), In formula (2), a = 1 to 20, b = 1 to 20, c = 1 to 20, d = 1 to 20, e = 1 to 20, f = 1 to 20, and g = 1 to 20. h＝1～20。 4. A high-coat-weight recyclable rubber release agent according to claim 1, characterized in that: Polypropylene glycol having a molecular weight in the range of 200 to 2000.
5. A high-coat-weight recyclable rubber release agent according to claim 1, characterized in that: The polyether polyols and the ethylene diamine polyether have a molecular weight in the range of 3000 to 10000.