Method for retarding aging degradation of polyethylene glycol polymer

Abstract

The invention provides a method for retarding aging degradation of a polyethylene glycol polymer, which comprises the following steps: step 1, triethanolamine is added into the polyethylene glycol polymer, and the weight ratio of the polyethylene glycol polymer to the triethanolamine is 100: (0.1-10); step 2, dissolving the polymer above the melting point temperature of the polyethylene glycol polymer; and step 3, uniformly stirring and mixing. The triethanolamine is added into the polyethylene glycol polymer, so that the molecular weight decline speed in the high-temperature accelerated aging process of the polyethylene glycol polymer is greatly reduced, the time for generating new functional groups by aging degradation of the polyethylene glycol polymer is greatly delayed, and the method has the advantages that the operation is simple, the cost is low, the service life of the polyethylene glycol polymer is greatly prolonged, and the benefit is remarkable.

Description

Technical Field

[0001] The present invention belongs to the field of polymers, and particularly relates to a method for slowing down the aging and degradation of polyethylene glycol polymers. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The linear molecular structural formula of polyethylene glycol (PEG) is HO-(CH2CH20)n-H. PEG is widely used in industries such as cosmetics, pharmaceuticals, chemical fibers, rubber, plastics, papermaking, paints, electroplating, pesticides, metal processing, and solid propellants. The inventor has found through research that PEG is prone to aging and degradation during long-term storage, generating new functional groups or a decrease in molecular weight, specifically including C-O bond-breaking reactions and H atom transfer reactions, thereby affecting its use effect.

[0004] Currently, there is no literature or patent reporting a method for slowing down the aging and degradation of polyethylene glycol polymers or an antioxidant for preventing the aging and degradation of polyethylene glycol polymers. Based on this, slowing down the aging and degradation of PEG and improving its storage performance on the existing basis is of great significance for its application. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for slowing down the aging and degradation of polyethylene glycol polymers to achieve the purpose of improving their service life.

[0006] Polyethylene glycol polymers will undergo aging and degradation during high-temperature accelerated aging, generating new functional groups and a gradual decrease in molecular weight, affecting their service life and use effect. To slow down the degradation of polyethylene glycol polymers, the technical solution adopted by the present invention is as follows: A method for slowing down the aging and degradation of polyethylene glycol polymers, characterized by comprising the following steps: Step 1: Add triethanolamine to the polyethylene glycol polymer, and the weight ratio of the polyethylene glycol polymer to triethanolamine is 100:0.1 - 10; Step 2: Dissolve the polymer above the melting point temperature of the polyethylene glycol polymer; Step 3: Stir and mix evenly.

[0007] The polyethylene glycol polymers include polyethylene glycols with different degrees of branching and polyethylene glycols with different molecular weights.

[0008] The polyethylene glycol with different degrees of branching is star-shaped polyoxyalkylene.

[0009] The polyethylene glycol with different molecular weights is polyethylene glycol with a number average molecular weight of 5000 - 35000.

[0010] The weight ratio of the polyethylene glycol polymer to triethanolamine is 100:1 - 5.

[0011] On the other hand, the present invention provides a polyethylene glycol polymer with anti-aging and degradation resistance, which is characterized in that it is prepared by the following method, including the following steps: Step 1: Add triethanolamine to the polyethylene glycol polymer, and the weight ratio of the polyethylene glycol polymer to triethanolamine is 100:0.1 - 10; Step 2: Dissolve the polymer above the melting point temperature of the polyethylene glycol polymer; Step 3: After stirring and mixing evenly, restore to room temperature to obtain a polyethylene glycol polymer with anti-aging and degradation resistance.

[0012] The polyethylene glycol polymer includes polyethylene glycols with different degrees of branching and polyethylene glycols with different molecular weights.

[0013] The polyethylene glycol with different degrees of branching is star-shaped polyalkylene oxide; the polyethylene glycol with different molecular weights is polyethylene glycol with a number average molecular weight of 5000 - 35000.

[0014] The weight ratio of the polyethylene glycol polymer to triethanolamine is 100:1 - 5.

[0015] On the other hand, the present invention provides an application of triethanolamine in anti-aging and degradation resistance of polyethylene glycol polymers. Triethanolamine can improve the storage life of polyethylene glycol polymers. And because triethanolamine and polyethylene glycol contain the same functional group hydroxyl and can both participate in curing in the cross-linking and curing system, triethanolamine will not migrate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The method for slowing down the aging and degradation of polyethylene glycol polymers provided by the present invention is simple to operate, and the solvent used has low cost. It can effectively slow down the aging and degradation of polyethylene glycol polymers and improve their service life. The present invention uses triethanolamine as an anti-aging agent for anti-aging and degradation resistance of polyethylene glycol polymers. By adding triethanolamine to the polyethylene glycol polymer, the molecular weight decrease rate during the high-temperature accelerated aging process is greatly reduced, and the time for new functional groups to appear during its aging and degradation is greatly postponed. It has the advantages of simple operation, economic cost, greatly improving the service life of polyethylene glycol polymers, and remarkable benefits. At the same time, the provided polyethylene glycol polymer with anti-aging and degradation resistance has broad application prospects. Description of the Drawings

[0017] Figure 1 The figure shows the change trend of the molecular weight of linear polyethylene glycol with the aging time at 90°C after adding the anti-aging agent.

[0018] Figure 2The infrared spectrum of linear polyethylene glycol after high-temperature accelerated aging at 90°C after adding an antioxidant is shown below.

[0019] Figure 3 The following shows the change trend of the molecular weight of branched star-shaped polyalkylene oxide (PAO) with aging time at 90°C after adding an antioxidant.

[0020] Figure 4 The infrared spectrum of PAO after high-temperature accelerated aging at 90°C after adding an antioxidant is shown below. Detailed implementation manners

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0022] Known technologies, methods, and devices for those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification.

[0023] In the following embodiments, the test methods or testing methods, unless otherwise specified, are all conventional methods; the reagents and materials, unless otherwise specified, are all obtained from conventional commercial channels or prepared by conventional methods. Embodiment 1

[0024] Weigh 4 g of polyethylene glycol (number-average molecular weight of 6000) at room temperature in a glass bottle, add 0.2 g of triethanolamine, wait for the polyethylene glycol to dissolve in an oven at 90°C, mix the mixed solution evenly with a glass rod, and then place it in an oven at 90°C for high-temperature accelerated aging test.

[0025] Research found that as the aging time extends, as Figure 1 , the molecular weight of polyethylene glycol gradually decreases, and the decrease is obvious on the ninth day of aging. After adding triethanolamine to polyethylene glycol, there is no obvious change in the molecular weight after aging for 58 days.

[0026] It can be seen from the infrared spectrum that as Figure 2 , there is a new peak at 1718 cm in the infrared spectrum of polyethylene glycol after aging at 90°C for 14 days -1It is generated, indicating that polyethylene glycol undergoes aging degradation to produce new functional groups. After adding triethanolamine to polyethylene glycol and aging at 90 °C for 58 days, no new peaks of aging degradation are found in the infrared spectrum. This shows that triethanolamine can effectively alleviate the aging degradation of polyethylene glycol, and its service life can be extended by at least 4 times. Example 2

[0027] Weigh 4 g of star-shaped polyalkylene oxide (PAO) with a number average molecular weight of 30,000 at room temperature into a glass bottle, add 0.04 g of triethanolamine, wait for PAO to dissolve in an oven at 90 °C, then use a glass rod to mix the mixed solution evenly, and then place it in an oven at 90 °C for a high-temperature accelerated aging test.

[0028] Research has found that as the aging time extends, such as Figure 3 , the molecular weight of PAO gradually decreases. The molecular weight decreases significantly when aging for 21 days, and when aging for 44 days, the molecular weight is less than one-tenth of the original. After adding triethanolamine to PAO, the molecular weight does not change significantly after aging for 28 days. After that, the molecular weight decreases slightly, but the decrease rate is less than that of PAO aging alone. When aging for 45 days, the molecular weight is about three-quarters of the original molecular weight.

[0029] It can be seen from the infrared spectrum that, such as Figure 4 , new peaks at 1718 cm -1 are generated in the infrared spectrum of PAO after aging at 90 °C for 24 days, indicating that PAO undergoes aging degradation to produce new functional groups. After adding triethanolamine to PAO and aging at 90 °C for 48 days, no new peaks of aging degradation are found in the infrared spectrum. This shows that triethanolamine can effectively alleviate the aging degradation of PAO, and its service life can be extended by at least 2 times.

[0030] The above are only exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for slowing down the aging and degradation of polyethylene glycol polymers, characterized in that: It includes the following steps: Step 1: Add triethanolamine to the polyethylene glycol polymer, and the weight ratio of the polyethylene glycol polymer to triethanolamine is 100:0.1 - 10; Step 2: Dissolve the polymer above the melting point temperature of the polyethylene glycol polymer; Step 3: Stir and mix evenly.

2. The method for slowing down the aging degradation of polyethylene glycol polymers according to claim 1, characterized in that: The polyethylene glycol polymer includes polyethylene glycol with different degrees of branching and polyethylene glycol with different molecular weights.

3. The method for slowing down the aging and degradation of polyethylene glycol polymers according to claim 2, characterized in that: The polyethylene glycol with different degrees of branching is star-shaped polyalkylene oxide.

4. The method for slowing down the aging degradation of polyethylene glycol polymers according to claim 2, characterized in that: The polyethylene glycol with different molecular weights is polyethylene glycol with a number average molecular weight of 5000 - 35000.

5. The method for slowing down the aging degradation of polyethylene glycol polymers according to claim 1, characterized in that: The weight ratio of the polyethylene glycol polymer to triethanolamine is 100:1 - 5.

6. A polyethylene glycol-based polymer resistant to aging and degradation, characterized in that: It is prepared by the following method, including the following steps: Step 1: Add triethanolamine to the polyethylene glycol polymer, and the weight ratio of the polyethylene glycol polymer to triethanolamine is 100:0.1 - 10; Step 2: Dissolve the polymer above the melting point temperature of the polyethylene glycol polymer; Step 3: After stirring and mixing evenly, restore to room temperature to obtain a polyethylene glycol polymer with anti-aging and anti-degradation properties.

7. The method for retarding the aging degradation of polyethylene glycol polymers according to claim 6, characterized in that: The polyethylene glycol polymer includes polyethylene glycol with different degrees of branching and polyethylene glycol with different molecular weights.

8. The method for slowing down the aging degradation of polyethylene glycol polymers according to claim 6, characterized in that: The polyethylene glycol with different degrees of branching is star-shaped polyalkylene oxide; the polyethylene glycol with different molecular weights is polyethylene glycol with a number average molecular weight of 6000 - 30000.

9. The method for slowing down the aging degradation of polyethylene glycol polymers according to claim 6, characterized in that: The weight ratio of the polyethylene glycol polymer to triethanolamine is 100:1 - 5.

10. Application of triethanolamine in anti-aging and anti-degradation of polyethylene glycol polymers.

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