Polyacrylate instant absorption material and preparation method thereof

Abstract

The invention specifically discloses a polyacrylate instant absorption material and a preparation method thereof. The polyacrylate instant absorption material is prepared from a water phase with the mass fraction of 1 to 20 percent and an oil phase with the mass fraction of 80 to 99 percent, the oil phase comprises the following components in parts by weight: 40-70 parts of a polymer monomer; 15-30 parts of a cross-linking agent monomer; 15-30 parts of an emulsifier; 1-5 parts of a co-emulsifier; and 1-5 parts of a light curing agent. Researches show that the polyacrylate instant absorption material prepared from the raw materials has a relatively high water absorption speed and a relatively high water absorption rate; therefore, the polyacrylate instant absorption material has important application value when being used for preparing sanitary napkins, diapers, medical materials and the like.

Description

Technical Field

[0001] The invention relates to the technical field of chemical material preparation, and specifically discloses a polyacrylate instantaneous absorption material and a preparation method thereof. Background Art

[0002] Water-absorbent materials are materials with hydrophilic groups that can absorb a large amount of water and swell while keeping the water from flowing out. Common water-absorbent materials include starch grafted acrylates, highly substituted cross-linked cellulose methyl cellulose, cross-linked methyl cellulose grafted acrylamide, cross-linked light ethyl cellulose grafted acrylamide polymers, and grafted acrylamide, etc. They are widely used in sanitary napkins, diapers, medical materials, etc.

[0003] In order to meet the higher demands of people in daily life, the water absorption speed is required, so the water-absorbing materials are required to be higher. Instantaneous absorption materials not only have excellent water absorption and water retention properties, but also have a faster absorption speed, so the demand is also increasing. However, there are few research reports on polyacrylate instantaneous absorption materials; therefore, providing a polyacrylate instantaneous absorption material has important application value. Summary of the invention

[0004] In order to overcome at least one of the technical problems existing in the prior art, the present invention first provides a polyacrylate instantaneous absorption material and a preparation method thereof.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a polyacrylate instant absorbent material, which comprises a water phase with a mass fraction of 1 to 20% and an oil phase with a mass fraction of 80 to 99%;

[0007] The oil phase comprises the following components in parts by weight: 40 to 70 parts of polymer monomers; 15 to 30 parts of cross-linking agent monomers; 15 to 30 parts of emulsifiers; 1 to 5 parts of co-emulsifiers; and 1 to 5 parts of photocuring agents.

[0008] The present invention provides a new polyacrylate instantaneous absorption material. Studies have shown that the polyacrylate instantaneous absorption material prepared by using the raw materials of the present invention has a faster water absorption speed and a higher water absorption ratio.

[0009] Preferably, the polymer monomer is selected from one or a mixture of more than one of ethylhexyl acrylate, ethyloctyl acrylate, butyl acrylate, methyl acrylate and benzyl methacrylate.

[0010] Preferably, the polymer monomer is selected from a combination of ethylhexyl acrylate and benzyl methacrylate.

[0011] The inventors have found through a large number of experiments that, in the process of preparing polyacrylate instant absorbent materials, the polymer monomer plays an important role in the water absorption rate of the prepared polyacrylate instant absorbent materials; studies have shown that when the polymer monomer is selected from the combination of ethylhexyl acrylate and benzyl methacrylate, the water absorption rate of the polyacrylate instant absorbent material prepared is much higher than that of the polyacrylate instant absorbent material prepared by using only ethylhexyl acrylate or benzyl methacrylate; and it is also much higher than that of the polyacrylate instant absorbent material prepared by using other combinations of polymer monomers.

[0012] Preferably, the mass ratio of ethylhexyl acrylate to benzyl methacrylate is 1-3:1-3.

[0013] Most preferably, the mass ratio of ethylhexyl acrylate to benzyl methacrylate is 1:1.

[0014] Preferably, the emulsifier is selected from octylphenol polyoxyethylene ether, glyceryl palmitate or polyglyceryl-2 diisostearate.

[0015] Preferably, the emulsifier is composed of octylphenol polyoxyethylene ether, glyceryl palmitate and polyglyceryl-2 diisostearate.

[0016] More preferably, the mass ratio of octylphenol polyoxyethylene ether, glyceryl palmitate and polyglyceryl-2 diisostearate is 3-6:2-4:1-3.

[0017] Most preferably, the mass ratio of octylphenol polyoxyethylene ether, glyceryl palmitate and polyglyceryl-2 diisostearate is 5:3:2.

[0018] The inventors have found in a large number of experiments that in the process of selecting a combination of ethylhexyl acrylate and benzyl methacrylate as polymer monomers to prepare polyacrylate instant absorbent materials, emulsifiers also play an important role; studies have shown that the water absorption rate of polyacrylate instant absorbent materials prepared by using an emulsifier composed of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate is much higher than that of polyacrylate instant absorbent materials prepared by using a single octylphenol polyoxyethylene ether, glycerol palmitate or polyglycerol-2 diisostearate as an emulsifier. The emulsifier composed of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate can synergistically improve the water absorption rate of polyacrylate instant absorbent materials.

[0019] In addition, the inventors have also studied and found that the water absorption rate of the polyacrylate instant absorption material prepared by using an emulsifier composed of any two of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate is not significantly higher than that of the polyacrylate instant absorption material prepared by using a single octylphenol polyoxyethylene ether, glycerol palmitate or polyglycerol-2 diisostearate as an emulsifier. This shows that: the water absorption rate of the polyacrylate instant absorption material can be synergistically improved only by using an emulsifier composed of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate; however, the water absorption rate of the polyacrylate instant absorption material cannot be synergistically improved by using an emulsifier composed of any two of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate.

[0020] Preferably, the co-emulsifier is selected from sodium stearate or sodium lauryl sulfate.

[0021] Preferably, the crosslinking agent monomer is selected from vinyl methacrylate.

[0022] Preferably, the photocuring agent is selected from chromium acetate.

[0023] Preferably, the aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 3% to 5%.

[0024] The present invention also provides a method for preparing the above-mentioned polyacrylate instantaneous absorption material, which comprises the following steps:

[0025] The polymer monomer, the cross-linking agent monomer, the emulsifier, the co-emulsifier and the photocuring agent are uniformly stirred to obtain a pre-polymerized oil phase;

[0026] The prepolymerized oil phase is mixed with the water phase and then emulsified to obtain an emulsion;

[0027] homogenizing the emulsion to obtain a homogenized emulsion;

[0028] The homogenized emulsion is processed by a traction machine to obtain a lamellar emulsion;

[0029] The lamellar emulsion enters the ultraviolet curing zone for curing under the action of a traction machine, thereby obtaining a cured lamellar water-absorbing material, namely, the polyacrylate instantaneous absorbent material.

[0030] Preferably, the curing time in the UV curing zone is 10 to 20 minutes.

[0031] Beneficial effects: The present invention provides a new polyacrylate instant absorbent material. Studies have shown that the polyacrylate instant absorbent material prepared using the raw materials of the present invention has a faster water absorption speed and a higher water absorption ratio; therefore, the polyacrylate instant absorbent material of the present invention is used to prepare sanitary napkins, diapers and medical materials, etc., which has important application value. DETAILED DESCRIPTION

[0032] The present invention is further explained below in conjunction with specific examples, but the examples do not limit the present invention in any form.

[0033] Example 1 Preparation of polyacrylate instantaneous absorption material

[0034] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0035] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0036] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0037] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0038] The polymer monomer is composed of ethylhexyl acrylate and benzyl methacrylate in a mass ratio of 1:1;

[0039] The emulsifier is composed of octylphenol polyoxyethylene ether OP-10, glycerol palmitate and polyglycerol-2 diisostearate in a weight ratio of 5:3:2.

[0040] Preparation method:

[0041] (1) mixing the polymer monomer, the cross-linking agent monomer, the emulsifier, the co-emulsifier and the photocuring agent to obtain a prepolymerized oil phase;

[0042] (2) mixing the prepolymerized oil phase with the water phase and emulsifying them to obtain an emulsion;

[0043] (3) homogenizing the emulsion to obtain a homogenized emulsion;

[0044] (4) treating the homogenized emulsion with a traction machine to obtain a lamellar emulsion;

[0045] (5) The lamellar emulsion enters the ultraviolet curing zone under the action of a traction machine for curing for 15 minutes to obtain a cured lamellar water-absorbing material, namely, the polyacrylate instantaneous absorbent material.

[0046] Example 2 Preparation of polyacrylate instantaneous absorption material

[0047] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0048] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0049] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0050] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0051] The polymer monomer is ethylhexyl acrylate;

[0052] The emulsifier is composed of octylphenol polyoxyethylene ether OP-10, glycerol palmitate and polyglycerol-2 diisostearate in a weight ratio of 5:3:2.

[0053] The preparation method is the same as Example 1.

[0054] Example 3 Preparation of polyacrylate instantaneous absorption material

[0055] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0056] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0057] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0058] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0059] The polymer monomer is benzyl methacrylate;

[0060] The emulsifier is composed of octylphenol polyoxyethylene ether OP-10, glycerol palmitate and polyglycerol-2 diisostearate in a weight ratio of 5:3:2.

[0061] The preparation method is the same as Example 1.

[0062] Example 4 Preparation of polyacrylate instantaneous absorption material

[0063] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0064] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0065] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0066] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0067] The polymer monomers are composed of methyl acrylate and benzyl methacrylate in a mass ratio of 1:1;

[0068] The emulsifier is composed of octylphenol polyoxyethylene ether OP-10, glycerol palmitate and polyglycerol-2 diisostearate in a weight ratio of 5:3:2.

[0069] The preparation method is the same as Example 1.

[0070] Example 5 Preparation of polyacrylate instantaneous absorption material

[0071] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0072] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0073] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0074] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0075] The polymer monomer is composed of ethyl octyl acrylate and methyl acrylate in a mass ratio of 1:1;

[0076] The emulsifier is composed of octylphenol polyoxyethylene ether OP-10, glycerol palmitate and polyglycerol-2 diisostearate in a weight ratio of 5:3:2.

[0077] The preparation method is the same as Example 1.

[0078] Example 6 Preparation of polyacrylate instantaneous absorption material

[0079] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0080] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0081] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0082] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0083] The polymer monomer is composed of ethylhexyl acrylate and benzyl methacrylate in a mass ratio of 1:1;

[0084] The emulsifier is octylphenol polyoxyethylene ether OP-10.

[0085] The preparation method is the same as Example 1.

[0086] Example 7 Preparation of polyacrylate instantaneous absorption material

[0087] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0088] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0089] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0090] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0091] The polymer monomer is composed of ethylhexyl acrylate and benzyl methacrylate in a mass ratio of 1:1;

[0092] The emulsifier is glycerol palmitate.

[0093] The preparation method is the same as Example 1.

[0094] Example 8 Preparation of polyacrylate instantaneous absorption material

[0095] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0096] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0097] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0098] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0099] The polymer monomer is composed of ethylhexyl acrylate and benzyl methacrylate in a mass ratio of 1:1;

[0100] The emulsifier is composed of polyglycerol-2 diisostearate.

[0101] The preparation method is the same as Example 1.

[0102] Example 9 Preparation of polyacrylate instantaneous absorption material

[0103] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0104] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0105] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0106] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0107] The polymer monomer is composed of ethylhexyl acrylate and benzyl methacrylate in a mass ratio of 1:1;

[0108] The emulsifier is composed of octylphenol polyoxyethylene ether OP-10 and polyglycerol-2 diisostearate in a weight ratio of 5:2.

[0109] The preparation method is the same as Example 1.

[0110] Example 10 Preparation of polyacrylate instantaneous absorption material

[0111] The raw materials for preparing the polyacrylate instantaneous absorption material are composed of 5% by mass of a water phase and 95% by mass of an oil phase;

[0112] The aqueous phase is a calcium hydroxide aqueous solution with a mass fraction of 5%;

[0113] The oil phase comprises the following components by weight: 60 parts of polymer monomer; 18 parts of cross-linking agent monomer; 16 parts of emulsifier; 2 parts of auxiliary emulsifier; 2 parts of light curing agent;

[0114] The crosslinking agent monomer is vinyl methacrylate; the auxiliary emulsifier is sodium stearate; the light curing agent is chromium acetate;

[0115] The polymer monomer is composed of ethylhexyl acrylate and benzyl methacrylate in a mass ratio of 1:1;

[0116] The emulsifier is composed of octylphenol polyoxyethylene ether OP-10 and glycerol palmitate in a weight ratio of 5:3.

[0117] The preparation method is the same as Example 1.

[0118] Experimental Example 1

[0119] Take 10g of the polyacrylate instantaneous absorbent material prepared in Examples 1 to 10, immerse it in water for 2 seconds and then take it out to test the water absorption rate of each polyacrylate instantaneous absorbent material; water absorption rate = (mass after absorption - mass before absorption) / mass before absorption; the test results are shown in Table 1.

[0120] Table 1. Water absorption rate of polyacrylate instantaneous absorption materials

[0121]

[0122]

[0123] It can be seen from the experimental results in Table 1 that the polyacrylate instantaneous absorption material prepared by the present invention has a water absorption rate of more than 30 times within 2 seconds; this shows that the polyacrylate instantaneous absorption material prepared by the present invention has a faster water absorption speed and a higher water absorption rate.

[0124] It can also be seen from the experimental results in Table 1 that the polyacrylate instant absorbent material prepared in Example 1 is much higher than the polyacrylate instant absorbent material prepared in Examples 2 to 5; this shows that: in the process of preparing the polyacrylate instant absorbent material, the polymer monomer plays an important role in the water absorption rate of the prepared polymer polyacrylate instant absorbent material; when the polymer monomer is selected from the combination of ethylhexyl acrylate and benzyl methacrylate, the polyacrylate instant absorbent material prepared has a water absorption rate that is much higher than that of the polyacrylate instant absorbent material prepared by using ethylhexyl acrylate or benzyl methacrylate alone; and it is also much higher than that of the polyacrylate instant absorbent material prepared by using other combinations of polymer monomers.

[0125] It can also be seen from the experimental results in Table 1 that the polyacrylate instant absorption material prepared in Example 1 is much higher than the polyacrylate instant absorption material prepared in Examples 6 to 8; this shows that: in the process of selecting a combination of ethylhexyl acrylate and benzyl methacrylate as a polymer monomer to prepare polyacrylate instant absorption materials, emulsifiers also play an important role; the polyacrylate instant absorption material prepared by using an emulsifier composed of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate has a water absorption rate that is much higher than the polyacrylate instant absorption material prepared by using a single octylphenol polyoxyethylene ether, glycerol palmitate or polyglycerol-2 diisostearate as an emulsifier. The emulsifier composed of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate can synergistically improve the water absorption rate of polyacrylate instant absorption materials.

[0126] It can also be seen from the experimental results in Table 1 that the polyacrylate instant absorption materials prepared in Examples 9 and 10 have not been improved or significantly improved compared with the polyacrylate instant absorption materials prepared in Examples 6 to 8; it can be seen that the water absorption rate of the polyacrylate instant absorption material prepared by using an emulsifier composed of any two of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate cannot be significantly higher than that of the polyacrylate instant absorption material prepared by using a single octylphenol polyoxyethylene ether, glycerol palmitate or polyglycerol-2 diisostearate as an emulsifier. This shows that an emulsifier composed of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate must be used to synergistically improve the water absorption rate of the polyacrylate instant absorption material; however, the use of an emulsifier composed of any two of octylphenol polyoxyethylene ether, glycerol palmitate and polyglycerol-2 diisostearate cannot synergistically improve the water absorption rate of the polyacrylate instant absorption material.

Claims

1. A polyacrylate instantaneous absorption material, characterized in that: The invention comprises a water phase with a mass fraction of 1 to 20% and an oil phase with a mass fraction of 80 to 99%; The oil phase comprises the following components in parts by weight: 40 to 70 parts of polymer monomers; 15 to 30 parts of cross-linking agent monomers; 15 to 30 parts of emulsifiers; 1 to 5 parts of co-emulsifiers; and 1 to 5 parts of photocuring agents.

2. The polyacrylate instantaneous absorption material according to claim 1, characterized in that: The polymer monomer is selected from one or a mixture of more than one of ethylhexyl acrylate, ethyloctyl acrylate, butyl acrylate, methyl acrylate and benzyl methacrylate.

3. The polyacrylate instantaneous absorption material according to claim 1, characterized in that: The polymer monomer is selected from the combination of ethylhexyl acrylate and benzyl methacrylate.

4. The polyacrylate instantaneous absorption material according to claim 3, characterized in that: The mass ratio of ethylhexyl acrylate to benzyl methacrylate is 1-3:1-3.

5. The polyacrylate instantaneous absorption material according to claim 1, characterized in that: The emulsifier is selected from octylphenol polyoxyethylene ether, glyceryl palmitate or polyglyceryl-2 diisostearate.

6. The polyacrylate instantaneous absorption material according to claim 1, characterized in that: The auxiliary emulsifier is selected from sodium stearate or sodium lauryl sulfate.

7. The polyacrylate instantaneous absorption material according to claim 1, characterized in that: The crosslinking agent monomer is selected from vinyl methacrylate.

8. The polyacrylate instantaneous absorption material according to claim 1, characterized in that: The photocuring agent is selected from chromium acetate.

9. The method for preparing the polyacrylate instantaneous absorption material according to any one of claims 1 to 8, characterized in that: The following steps are included: The polymer monomer, the cross-linking agent monomer, the emulsifier, the co-emulsifier and the photocuring agent are uniformly stirred to obtain a pre-polymerized oil phase; The prepolymerized oil phase is mixed with the water phase and then emulsified to obtain an emulsion; homogenizing the emulsion to obtain a homogenized emulsion; The homogenized emulsion is processed by a traction machine to obtain a lamellar emulsion; The lamellar emulsion enters the ultraviolet curing zone for curing under the action of a traction machine, thereby obtaining a cured lamellar water-absorbing material, namely, the polyacrylate instantaneous absorbent material.

10. The preparation method according to claim 9, characterized in that: The curing time in the UV curing zone is 10 to 20 minutes.

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