Modified polypropylene emulsion and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of modified polypropylene emulsion, and particularly relates to modified polypropylene emulsion and a preparation method thereof. According to the modified polypropylene emulsion provided by the invention, the particle size and performance of the emulsion are improved mainly by introducing a new surfactant, and the used surfactant is an anionic surfactant sodium sulfosuccinate and / or a nonionic surfactant polyglycerol ester. Sodium sulfosuccinate serves as a surfactant and can form a protective layer on an oil-water interface to hinder aggregation of an oil phase, so that emulsion with smaller particle size can be obtained; the polyglycerol ester can provide better interfacial activity and permeability, so that the surfactant can be more easily dispersed into a solution, and meanwhile, the HLB (Hydrophile-Lipophile Balance) value of the polyglycerol ester is relatively high and can easily meet the HLB requirement of the modified polypropylene emulsion. In addition, hydrophobic sodium sulfosuccinate and hydrophilic polyglycerol ester are combined to form a more stable emulsion film on an oil-water interface, so that the stability of the emulsion is improved. The modified polypropylene emulsion provided by the invention has small particle size, good dispersibility and stability.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of modified polypropylene emulsion, and specifically relates to a modified polypropylene emulsion and a preparation method thereof. Background Art

[0002] In the modified polypropylene emulsion, conventional polypropylene has high stereoregularity and low solubility in organic solvents, which makes the emulsion stable. Reducing the concentration of the polypropylene solution can increase the solubility, but the solvent needs to be evaporated in the final stage of emulsification, which will increase the production cost. Although increasing the concentration can reduce the amount of organic solvent used, it will affect the dispersion of the emulsion, which will seriously affect the performance of the emulsion.

[0003] The melt emulsion method can avoid the use of organic solvents and emulsify the crystalline modified polypropylene in a molten state. Although this method may affect the performance of the emulsion due to the high melting temperature, it is controllable.

[0004] In addition to the influence of the preparation method on the performance of the emulsion, the type and amount of surfactant used in the emulsion preparation process also greatly affect the key properties of the emulsion, such as particle size, dispersibility and stability. Summary of the invention

[0005] The purpose of the present invention is to provide a modified polypropylene emulsion and a preparation method thereof.

[0006] The first aspect of the present invention provides a modified polypropylene emulsion, comprising:

[0007] Modified polypropylene, surfactant, neutralizing base, fatty acid and water;

[0008] The weight ratio of the modified polypropylene, surfactant, neutralizing base and fatty acid is (65-75): (10-13): (5-7): (13-17);

[0009] The surfactant includes sodium sulfosuccinate and / or polyglycerol ester.

[0010] In one embodiment of the present application, the modified polypropylene may be a commonly used modified polypropylene in the art; preferably, the modified polypropylene is PP-g-MHA.

[0011] In one embodiment of the present application, the polyglycerol ester includes polyglyceryl-6 distearate, polyglyceryl-10 stearate or polyglyceryl-10 dipalmitate; preferably, the polyglycerol ester is polyglyceryl-6 distearate.

[0012] In one embodiment of the present application, when the surfactant includes sodium sulfosuccinate and polyglycerol ester, the ratio of sodium sulfosuccinate to polyglycerol ester is 1:3 to 2:1; preferably, the ratio of sodium sulfosuccinate to polyglycerol ester is 1:2, 1:3 or 2:1.

[0013] In one embodiment of the present application, the neutralizing base may be a neutralizing base commonly used in the art, such as hydroxylamine containing an amine and a hydroxyl group; preferably, the neutralizing base is diethanolamine.

[0014] In one embodiment of the present application, the fatty acid may be a fatty acid commonly used in the art, such as a modified fat mixture containing an acid, anhydride, or ester; preferably, the fatty acid is a stearic acid or fully hydrogenated rosin.

[0015] In one embodiment of the present application, the water may be deionized water or ultrapure water, and the specific amount used is prepared according to the actual required concentration of the emulsion.

[0016] In one embodiment of the present application, the modified polypropylene emulsion has an emulsion particle size of 100-300 nm and a PDI of 0.100-0.115.

[0017] In one embodiment of the present application, preferably, the modified polypropylene emulsion has an emulsion particle size of 110-150 nm and a PDI of 0.110.

[0018] The second aspect of the present invention provides a method for preparing the modified polypropylene emulsion as described above, comprising:

[0019] The modified polypropylene particles are heated to a molten state and a fatty acid is added;

[0020] While stirring continuously, slowly add the surfactant aqueous solution and the neutralizing base;

[0021] Continue stirring and slowly raise the temperature to 168-178°C for emulsification for 0.5-2h. After the emulsification is completed, the temperature can be slowly lowered to 140-150°C and then quickly lowered to room temperature to obtain a modified polypropylene emulsion.

[0022] The beneficial effect of the present invention is that the modified polypropylene emulsion of the present invention mainly realizes the improvement of the particle size and performance of the emulsion by introducing a new surfactant, and the surfactant used is an anionic surfactant sodium succinic acid sulfonate and / or a nonionic surfactant polyglycerol ester. Sodium succinic acid sulfonate acts as a surfactant and can form a protective layer at the oil-water interface to hinder the aggregation of the oil phase, thereby obtaining an emulsion with a smaller particle size; polyglycerol ester can provide better interfacial activity and permeability, which makes it easier for the surfactant to be dispersed into the solution. At the same time, the HLB value of polyglycerol ester is relatively high and it is easy to meet the HLB requirements of the modified polypropylene emulsion. In addition, the combination of hydrophobic sodium succinic acid sulfonate and hydrophilic polyglycerol ester can form a more stable emulsion film at the oil-water interface, thereby improving the stability of the emulsion. After the two surfactants are combined, a better synergistic effect can be produced, thereby taking into account the characteristics of the two surfactants to produce a better emulsification effect. The modified polypropylene emulsion of the present invention has a smaller particle size, good dispersibility and stability.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below for detailed description as follows. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] The weight proportions of each component of the modified polypropylene emulsion of this embodiment are:

[0027] Modified polypropylene PP-g-MHA 70 parts, surfactant sodium succinate sulfonate 13 parts, neutralizing base diethanolamine 7 parts, fatty acid 10 parts, water is prepared according to the required solution concentration;

[0028] The specific preparation process of the modified polypropylene emulsion of this embodiment is as follows:

[0029] The modified polypropylene is melted at 165°C and fatty acid is added, and then the surfactant aqueous solution and neutralizing alkali are slowly added; the temperature is slowly raised to 168-178°C and emulsified for 0.5-2h, and the heating rate is 1.8°C / min; after the emulsification, the temperature can be slowly lowered to 140-150°C and then quickly lowered to room temperature; during the emulsification process, an appropriate amount of deionized water can be added according to the actual required emulsion concentration.

[0030] The particle size of the emulsion obtained in this example is 100-120 nm, and the polytropic dispersion index (PDI) is 0.115.

[0031] Example 2

[0032] The weight proportions of each component of the modified polypropylene emulsion of this embodiment are:

[0033] Modified polypropylene PP-g-MHA 70 parts, surfactant polyglycerol ester 13 parts, neutralizing base diethanolamine 7 parts, fatty acid 10 parts, water is prepared according to the required solution concentration;

[0034] The specific preparation process of the modified polypropylene emulsion of this embodiment is as follows:

[0035] The modified polypropylene is melted at 165°C and fatty acids are added, and then the surfactant aqueous solution and neutralizing alkali are slowly added, and the temperature is slowly raised to 168-178°C for emulsification for 0.5-2h, and the heating rate is 1.8°C / min. After the emulsification, the temperature can be slowly lowered to 140-150°C and then quickly lowered to room temperature. During the emulsification process, an appropriate amount of deionized water can be added according to the actual emulsion concentration requirements.

[0036] Compared with Example 1, the surfactant in this example is replaced with polyglycerol ester, and the particle size, dispersibility and stability of the modified polypropylene emulsion are different.

[0037] The particle size of the emulsion obtained in this example is 200-300 nm, and the PDI is 0.10.

[0038] Example 3

[0039] The weight proportions of each component of the modified polypropylene emulsion of this embodiment are:

[0040] Modified polypropylene PP-g-MHA 70 parts;

[0041] 13 parts of surfactant, wherein the surfactant is a mixture of sodium sulfosuccinate and polyglycerol ester in a ratio of 1:2;

[0042] Neutralizing base diethanolamine 7 parts;

[0043] Fatty acids 10 parts;

[0044] Water is prepared according to the required solution concentration;

[0045] The specific preparation process of the modified polypropylene emulsion of this embodiment is as follows:

[0046] The modified polypropylene is melted at 165°C and fatty acids are added, and then the surfactant aqueous solution and neutralizing alkali are slowly added, and the temperature is slowly raised to 168-178°C for emulsification for 0.5-2h, and the heating rate is 1.8°C / min. After the emulsification, the temperature can be slowly lowered to 140-150°C and then quickly lowered to room temperature. During the emulsification process, an appropriate amount of deionized water can be added according to the actual emulsion concentration requirements.

[0047] Compared with Example 1 and Example 2, the surfactant in this example is changed to a mixed solvent of sodium sulfosuccinate and polyglycerol ester in a mixing ratio of 1:2. Sodium sulfosuccinate can ensure the particle size of the emulsion, while polyglycerol ester can bring dispersibility. The combination of the two brings about improved stability.

[0048] The particle size of the emulsion obtained in this example is 120-200 nm, and the PDI is 0.109.

[0049] Example 4

[0050] The difference between this embodiment and embodiment 3 is that the mixing ratio of the surfactant sodium succinate sulfonate and the polyglycerol ester mixed solvent is changed to 1:3.

[0051] The specific preparation process of the modified polypropylene emulsion of this embodiment is as follows:

[0052] The modified polypropylene is melted at 165°C and fatty acids are added, and then the surfactant aqueous solution and neutralizing alkali are slowly added, and the temperature is slowly raised to 168-178°C for emulsification for 0.5-2h, and the heating rate is 1.8°C / min. After the emulsification, the temperature can be slowly lowered to 140-150°C and then quickly lowered to room temperature. During the emulsification process, an appropriate amount of deionized water can be added according to the actual emulsion concentration requirements.

[0053] As the dosage of polyglycerol ester is further increased, the dispersibility and stability of the emulsion will be further improved, and the particle size of the corresponding emulsion will also be further reduced.

[0054] The particle size of the emulsion obtained in this example is 150-250 nm, and the PDI is 0.105.

[0055] Example 5

[0056] Compared with Example 4, the mixing ratio of the surfactant sodium succinate sulfonate and the polyglycerol ester mixed solvent is changed to 2:1 in this example.

[0057] The specific preparation process of the modified polypropylene emulsion of this embodiment is as follows:

[0058] The modified polypropylene is melted at 165°C and fatty acids are added, and then the surfactant aqueous solution and neutralizing alkali are slowly added, and the temperature is slowly raised to 168-178°C for emulsification for 0.5-2h, and the heating rate is 1.8°C / min. After the emulsification, the temperature can be slowly lowered to 140-150°C and then quickly lowered to room temperature. During the emulsification process, an appropriate amount of deionized water can be added according to the actual emulsion concentration requirements.

[0059] As the dosage of sodium succinate sulfonate was increased, the particle size of the emulsion decreased to a certain extent, and the dispersibility and stability of the emulsion also decreased accordingly.

[0060] The particle size of the emulsion obtained in this example is 110-150 nm, and the PDI is 0.110.

[0061] The modified polypropylene emulsion of the present invention mainly realizes the improvement of emulsion particle size and performance by introducing a new mixed surfactant, and the surfactant used is anionic surfactant sodium succinate sulfonate and nonionic surfactant polyglycerol ester. Sodium succinate sulfonate acts as a surfactant and can form a protective layer at the oil-water interface to hinder the aggregation of the oil phase, thereby obtaining an emulsion with a smaller particle size, but the dispersibility is slightly weak and the hydrophilic-lipophilic balance (HLB) value of sodium succinate sulfonate is low and it is not easy to reach the HLB requirement of the modified polypropylene emulsion. Polyglycerol ester can provide better interfacial activity and permeability, which makes it easier for the surfactant to be dispersed in the solution. At the same time, the HLB value of polyglycerol ester is relatively high and it is easy to reach the HLB requirement of the modified polypropylene emulsion. The only drawback is that the emulsion particle size prepared by polyglycerol ester as a surfactant is slightly larger. In addition, the combination of hydrophobic sodium succinate sulfonate and hydrophilic polyglycerol ester can form a more stable emulsion film at the oil-water interface to improve the stability of the emulsion. After the two surfactants are combined, a better synergistic effect can be produced, thereby taking into account the characteristics of the two surfactants to produce a better emulsification effect.

[0062] The modified polypropylene emulsion prepared by the invention can serve as an adhesive for metals, polymer materials and other materials.

[0063] The emulsion prepared by the invention has smaller particle size, good dispersibility and stability.

[0064] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A modified polypropylene emulsion, characterized in that: include: Modified polypropylene, surfactant, neutralizing base, fatty acid and water; The weight ratio of the modified polypropylene, surfactant, neutralizing base and fatty acid is (65-75): (10-13): (5-7): (13-17); The surfactant includes sodium sulfosuccinate and / or polyglycerol ester.

2. The modified polypropylene emulsion according to claim 1, characterized in that The modified polypropylene is PP-g-MHA.

3. The modified polypropylene emulsion according to claim 1, characterized in that The polyglycerol ester includes polyglyceryl-6 distearate, polyglyceryl-10 stearate or polyglyceryl-10 dipalmitate.

4. The modified polypropylene emulsion according to claim 1, characterized in that: When the surfactant comprises sodium sulfosuccinate and polyglycerol ester, the ratio of sodium sulfosuccinate to polyglycerol ester is 1:3 to 2:

1.

5. The modified polypropylene emulsion according to claim 1, characterized in that: The neutralizing base is a hydroxylamine containing an amine and a hydroxyl group.

6. The modified polypropylene emulsion according to claim 1, characterized in that: The fatty acid is a modified fat mixture containing acid, anhydride and ester.

7. The modified polypropylene emulsion according to claim 1, characterized in that: The modified polypropylene emulsion has an emulsion particle size of 100-300 nm and a PDI of 0.100-0.

115.

8. The modified polypropylene emulsion according to claim 1, characterized in that: The modified polypropylene emulsion has an emulsion particle size of 110-150 nm and a PDI of 0.

110.

9. A method for preparing the modified polypropylene emulsion according to any one of claims 1 to 8, characterized in that: include: The modified polypropylene particles are heated to a molten state and a fatty acid is added; While stirring continuously, slowly add the surfactant aqueous solution and the neutralizing base; Continue stirring and slowly raise the temperature to 168-178°C for emulsification. After the emulsification is completed, the temperature can be slowly lowered to 140-150°C and then quickly lowered to room temperature to obtain a modified polypropylene emulsion.