Application of a surfactant composition in realizing phase inversion of water-in-oil polymer emulsion and preparing oil-in-water polymer emulsion

Abstract

The present invention provides an application of a surfactant composition in realizing phase inversion of a water-in-oil polymer emulsion and preparing an oil-in-water polymer emulsion, wherein the surfactant composition comprises a linear polyoxyethylene ether and a branched polyoxyethylene ether, wherein the mass of the linear polyoxyethylene ether accounts for 10-90% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether. The technical solution provided by the present invention can quickly realize phase inversion of a water-in-oil polymer emulsion, requires a short time, and is easy to use.

Description

Technical Field

[0001] The present invention belongs to the field of chemical industry, and specifically relates to the application of a surfactant composition in realizing the phase inversion of an oil-in-water polymer emulsion and preparing an oil-in-water polymer emulsion, and especially relates to the application of a surfactant composition with a short phase inversion time in realizing the phase inversion of an oil-in-water polymer emulsion and preparing an oil-in-water polymer emulsion. Background Art

[0002] Printing and dyeing thickener is the most commonly used thickener in the printing and dyeing industry. Its main function is to provide good rheological properties, so that the dye and fiber are combined together to ensure that the printing and dyeing pattern has a clear outline. At present, the thickener products widely used at home and abroad belong to polyacrylic acid thickeners. Due to its special production method, the polymer emulsion is mostly an oil-in-water system, which can also be called an inverse emulsion. Before the inverse emulsion thickener is used in the actual printing and dyeing process, an external phase conversion agent is required to convert the oil-water phase of the thickener system, that is, the water phase is converted from a dispersed phase to a continuous phase, thereby releasing the polymer from the discontinuous phase and dispersing it in water to increase the viscosity of the solution.

[0003] Commonly used phase inversion agents are mostly non-ionic surfactants. Currently, the most commonly used is dodecyl polyoxyethylene ether non-ionic surfactant (mostly AEO-9). This product is cheap but can only meet basic application requirements. However, it has problems such as poor solubility, inconvenience in use at low temperatures, and long phase inversion time, which is very unfavorable for process cost control and process continuity, and has become the main factor restricting the improvement of production efficiency. Therefore, the development of a phase inversion agent with a more efficient phase inversion speed has a very positive practical application significance.

[0004] CN1027642C discloses an oil-in-water emulsion of a cationic polymer suitable for reversal, comprising a continuous phase containing a hydrophobic liquid, a discontinuous phase containing a water-soluble cationic polymer, and a surfactant system for reversing the emulsion in water. However, the system contains at least one alkyl phosphate, and the phosphorus-containing surfactant wastewater entering the natural water system will cause eutrophication of rivers, lakes and seas, that is, phosphorus-rich pollution seriously destroys the ecological balance. Moreover, the surfactant formula composition used in the invention is greatly different from the formula composition selected by the present invention.

[0005] CN1894284A discloses a combination of surfactants with a specific chemical structure, and a combination or mixture of two or more surfactants provides an effective demulsifier system. The invention uses a surfactant structure comprising: 1) an ethylene oxide / propylene oxide copolymer produced using ethylenediamine or trimethylolpropane as a starter; 2) an ethylene oxide / propylene oxide copolymer produced by a second surfactant starter selected from alcohol ethoxylates, ethoxylated fatty acid esters, ethoxylated sorbitan fatty acid esters, ethoxylated esters of fatty acids, and combinations thereof, which can realize the conversion of a water-compatible polymer product into an inverse emulsion.

[0006] Since the current phase inversion agents have a series of problems, how to provide a phase inversion agent with a short phase inversion time and easy use has become an urgent problem to be solved. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an application of a surfactant composition in achieving phase inversion of an oil-in-water polymer emulsion and preparing an oil-in-water polymer emulsion, and in particular to provide an application of a surfactant composition with a short phase inversion time in achieving phase inversion of an oil-in-water polymer emulsion and preparing an oil-in-water polymer emulsion. The technical solution provided by the present invention can quickly achieve phase inversion of an oil-in-water polymer emulsion, takes a short time, and is easy to use.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides an application of a surfactant composition in achieving phase inversion of an oil-in-water polymer emulsion, characterized in that the surfactant composition comprises a linear polyoxyethylene ether and a branched polyoxyethylene ether, and the mass of the linear polyoxyethylene ether accounts for 10-90% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether, for example, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85% or 90%, etc., but are not limited to the values ​​listed above, and other values ​​not listed within the above numerical range are equally applicable.

[0010] The above composition adopts the combination of linear polyoxyethylene ether and branched polyoxyethylene ether, which can synergistically promote the phase inversion of polyacrylic acid type, polyacrylamide type oil-in-water polymers and other oil-in-water polymer emulsions, and effectively reduce the phase inversion time.

[0011] Preferably, the mass of the linear polyoxyethylene ether accounts for 10-65% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether.

[0012] Preferably, the mass of the linear polyoxyethylene ether accounts for 15-45% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether.

[0013] Preferably, the linear polyoxyethylene ether is a polyoxyethylene ether started by a C10-C14 linear fatty primary alcohol, wherein the number of ethoxy repeating units is 6-23, for example, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 or 23, etc.

[0014] Compared with other linear polyoxyethylene ethers, the above-mentioned specific linear polyoxyethylene ether can be more effectively compounded with branched polyoxyethylene ethers and more effectively shorten the phase inversion time.

[0015] Preferably, the branched polyoxyethylene ether is a polyoxyethylene ether initiated by C8-C13 branched isomeric fatty primary alcohol, wherein the number of ethoxy repeating units is 6-20, for example 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20, etc.

[0016] Compared with other branched polyoxyethylene ethers, the above-mentioned specific branched polyoxyethylene ether can be more effectively compounded with linear polyoxyethylene ether and more effectively shorten the phase inversion time.

[0017] Preferably, the surfactant composition further comprises water.

[0018] Preferably, the surfactant composition further comprises a pH adjuster.

[0019] Preferably, the method for preparing the surfactant composition comprises the following steps:

[0020] The linear polyoxyethylene ether and the branched polyoxyethylene ether are mixed to obtain the composition.

[0021] Preferably, said mixing further comprises mixing with water.

[0022] Preferably, the mixing further comprises mixing with a pH adjuster.

[0023] Preferably, the mixing is performed under stirring, the stirring rate is 150-250 rpm, and the stirring time is 15-25 min.

[0024] Among them, the stirring rate can be 150rpm, 160rpm, 170rpm, 180rpm, 190rpm, 200rpm, 210rpm, 220rpm, 230rpm, 240rpm or 250rpm, etc., and the stirring time can be 15min, 16min, 17min, 18min, 19min, 20min, 21min, 22min, 23min, 24min or 25min, etc., but are not limited to the values ​​listed above, and other values ​​not listed within the above numerical range are also applicable.

[0025] In a second aspect, the present invention provides an application of a surfactant composition in the preparation of an oil-in-water polymer emulsion, wherein the surfactant composition comprises a linear polyoxyethylene ether and a branched polyoxyethylene ether, and the mass of the linear polyoxyethylene ether accounts for 10-90% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether.

[0026] Preferably, the linear polyoxyethylene ether is a polyoxyethylene ether initiated by a C10-C14 linear fatty primary alcohol, wherein the number of ethoxy repeating units is 6-23.

[0027] Preferably, the branched polyoxyethylene ether is a polyoxyethylene ether initiated by a C8-C13 branched isomeric fatty primary alcohol, wherein the number of ethoxy repeating units is 6-20.

[0028] In a third aspect, the present invention further provides a method for preparing an oil-in-water polymer emulsion, the preparation method comprising the following steps:

[0029] The water-in-oil type polymer emulsion is mixed with the surfactant composition as described above, and then mixed with water to obtain the oil-in-water type polymer emulsion.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides an application of a surfactant composition in achieving phase inversion of a water-in-oil polymer emulsion. By compounding a linear polyoxyethylene ether and a branched polyoxyethylene ether, the synergistic effect can effectively promote the phase inversion of the water-in-oil polymer emulsion and effectively reduce the phase inversion time. In addition, by selecting specific linear polyoxyethylene ethers and branched polyoxyethylene ethers, the phase inversion of the emulsion can be further shortened and the phase inversion time can be effectively shortened. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention, the technical solution of the present invention is further described below in conjunction with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0033] In the following examples and tests, acrylic thickener was purchased from Wuxi Zheyi;

[0034] PEG-4000 was purchased from Sailbon Petrochemical;

[0035] S-90 (polyoxyethylene ether containing 9 ethoxy repeating units initiated by C12 straight-chain fatty secondary alcohol) was purchased from Youso Chemical;

[0036] All other linear polyoxyethylene ethers and branched polyoxyethylene ethers were purchased from Sailboat Petrochemical.

[0037] Embodiment 1:

[0038] This embodiment provides a surfactant composition, and the preparation method is as follows:

[0039] In a screw-mouth glass bottle with a capacity of 10 mL, 0.580 g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by nonionic surfactant C12-C14 straight-chain fatty primary alcohol, 1.076 g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by nonionic surfactant C13 branched isomeric fatty primary alcohol, and 0.144 g of deionized water were added. After adding a magnetic stirrer, the mixture was placed on a magnetic stirrer and stirred at a stirring speed of 200 rpm for 20 minutes, after which the magnetic stirrer was removed to obtain the surfactant composition, which was then placed in a reagent bottle and sealed for storage.

[0040] Embodiment 2:

[0041] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 1.573 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 0.083 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0042] Embodiment 3:

[0043] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 1.325 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 0.331 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0044] Embodiment 4:

[0045] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 1.159 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 0.497 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0046] Embodiment 5:

[0047] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 1.076g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C12-C14 straight-chain fatty primary alcohol and 0.580g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C13 branched isomeric fatty primary alcohol.

[0048] Embodiment 6:

[0049] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.994g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C12-C14 straight-chain fatty primary alcohol and 0.662g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C13 branched isomeric fatty primary alcohol.

[0050] Embodiment 7:

[0051] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.911g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C12-C14 straight-chain fatty primary alcohol and 0.745g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C13 branched isomeric fatty primary alcohol.

[0052] Embodiment 8:

[0053] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.828g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C12-C14 straight-chain fatty primary alcohol and 0.828g of polyoxyethylene ether containing 9 ethoxy repeating units initiated by C13 branched isomerized fatty primary alcohol.

[0054] Embodiment 9:

[0055] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.745 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 0.911 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0056] Embodiment 10:

[0057] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0058] Embodiment 11:

[0059] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.497 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.159 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0060] Embodiment 12:

[0061] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.414 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.242 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0062] Embodiment 13:

[0063] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.331 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.325 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0064] Embodiment 14:

[0065] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.248 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.408 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0066] Embodiment 15:

[0067] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.166 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.490 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0068] Embodiment 16:

[0069] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether Surf-2 containing 10 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0070] Embodiment 17:

[0071] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 12 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0072] Embodiment 18:

[0073] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 6 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0074] Embodiment 19:

[0075] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 7 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0076] Embodiment 20:

[0077] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 10 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0078] Embodiment 21:

[0079] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 15 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0080] Embodiment 22:

[0081] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 23 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0082] Embodiment 23:

[0083] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12 branched isomeric primary fatty alcohol.

[0084] Embodiment 24:

[0085] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 6 ethoxy repeating units initiated by a C8 branched isomeric primary fatty alcohol.

[0086] Embodiment 25:

[0087] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C10 branched isomeric fatty primary alcohol.

[0088] Embodiment 26:

[0089] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 7 ethoxy repeating units initiated by a C10 branched isomeric primary fatty alcohol.

[0090] Embodiment 27:

[0091] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 7 ethoxy repeating units initiated by a C10 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0092] Comparative Example 1:

[0093] The preparation method is the same as that of Example 1, except that the nonionic surfactant added is 1.656 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol.

[0094] Comparative Example 2:

[0095] The preparation method is the same as that of Example 1, except that the nonionic surfactant added is 1.656 g of a polyoxyethylene ether containing 9 ethoxy repeating units and initiated from a C13 branched isomeric fatty primary alcohol.

[0096] Comparative Example 3:

[0097] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 5 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0098] Comparative Example 4:

[0099] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 30 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0100] Comparative Example 5:

[0101] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 5 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0102] Comparative Example 6:

[0103] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 5 ethoxy repeating units initiated by a C16-C18 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0104] Comparative Example 7:

[0105] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 25 ethoxy repeating units initiated by a C16-C18 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0106] Comparative Example 8:

[0107] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 5 ethoxy repeating units initiated by a C12 branched isomeric fatty primary alcohol.

[0108] Comparative Example 9:

[0109] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 5 ethoxy repeating units initiated by a C12-C14 straight-chain fatty primary alcohol and 1.076 g of PEG-400.

[0110] Comparative Example 10:

[0111] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g S-90 and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0112] Comparative Example 11

[0113] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C16-C18 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0114] Comparative Example 12

[0115] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C8-C10 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric primary fatty alcohol.

[0116] Comparative Example 13

[0117] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 25 ethoxy repeating units initiated by a C12-14 straight-chain fatty primary alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C13 branched isomeric fatty primary alcohol.

[0118] Comparative Example 14

[0119] The preparation method is the same as that of Example 1, except that the masses of the two nonionic surfactants added are 0.580 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C12-C14 straight-chain primary fatty alcohol and 1.076 g of a polyoxyethylene ether containing 9 ethoxy repeating units initiated by a C8 branched isomeric primary fatty alcohol.

[0120] Effect test:

[0121] 1.8 g of the surfactant composition provided in Examples 1-27 and Comparative Examples 1-14 was mixed with 88.2 g of an acrylic thickener, and then 4 g of the mixture was mixed with 496 g of deionized water, and stirred at 150 rpm. The viscosity value was detected every 30 seconds using a Brookfield rotational viscometer, and the detection time was continued to 1200 seconds. The viscosity value measured at each time point was recorded as Vti-t (Vti-30, Vti-60, Vti-90, ... Vti-1200). Based on the measured viscosity value Vti-t, the viscosity end point was fitted using a Logistic function, and the fitting end point was regarded as the final viscosity of the system Vis. The ratio of Vti-t to Vis × 100% was the reversal speed ratio, that is:

[0122] Reverse speed ratio = Vti-t / Vis×100%;

[0123] When the reversal speed ratio is higher than 90%, it is considered that the system has basically completed the phase inversion process at this moment, and this moment is recorded as the phase inversion time. By comparing the phase inversion time, the phase inversion efficiency of the composition is evaluated in turn. The time comparison is based on the phase inversion time of Comparative Example 1 as 100%, and the relative time of other groups relative to Comparative Example 1 is calculated. Invalid means that the composition fails to effectively achieve the phase inversion of the system within 1200 seconds, and the EO number is the number of ethoxy repeating units.

[0124] The results are as follows:

[0125]

[0126]

[0127]

[0128]

[0129] From the above data, it can be found that the technical solution provided by the present invention can quickly realize the phase inversion of the water-in-oil polymer emulsion; by comparing Example 1 and Comparative Example 1, it can be found that the present invention adopts a compound of a linear polyoxyethylene ether and a branched polyoxyethylene ether, and the synergistic effect can effectively promote the phase inversion of the water-in-oil polymer emulsion and effectively reduce the phase inversion time; by comparing Example 1 and Comparative Examples 3-14, it can be found that the present invention can significantly realize the phase inversion compared with other polyoxyethylene ethers by selecting specific linear polyoxyethylene ethers and branched polyoxyethylene ethers and controlling their chain lengths and the number of ethoxy repeating units therein, which has significant advantages.

[0130] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate the application of the surfactant composition of the present invention in achieving the phase inversion of the water-in-oil polymer emulsion and preparing the oil-in-water polymer emulsion, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0131] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0132] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. Use of a surfactant composition in achieving phase inversion of a water-in-oil polymer emulsion, characterized in that: The surfactant composition comprises a linear polyoxyethylene ether and a branched polyoxyethylene ether, wherein the mass of the linear polyoxyethylene ether accounts for 10-90% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether; The linear polyoxyethylene ether is a polyoxyethylene ether initiated by a C10-C14 linear fatty primary alcohol, wherein the number of ethoxy repeating units is 6-23; The branched polyoxyethylene ether is a polyoxyethylene ether initiated by C13 branched isomeric fatty primary alcohol, wherein the number of ethoxy repeating units is 6-12.

2. The use according to claim 1, characterized in that: The mass of the linear polyoxyethylene ether accounts for 10-65% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether.

3. The use according to claim 2, characterized in that: The mass of the linear polyoxyethylene ether accounts for 15-45% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether.

4. The use according to claim 1, characterized in that: The surface-active composition also includes water.

5. The use according to claim 1, characterized in that: The surface active composition also includes a pH adjuster.

6. The use according to claim 1, characterized in that: The preparation method of the surfactant composition comprises the following steps: The linear polyoxyethylene ether and the branched polyoxyethylene ether are mixed to obtain the composition.

7. The use according to claim 6, characterized in that: The mixing also includes mixing with water.

8. The use according to claim 6, characterized in that: The mixing also includes mixing with a pH adjuster.

9. The use according to claim 6, characterized in that: The mixing is performed under stirring, the stirring rate is 150-250 rpm, and the stirring time is 15-25 min.

10. Use of a surfactant composition in the preparation of an oil-in-water polymer emulsion, characterized in that: The surfactant composition comprises a linear polyoxyethylene ether and a branched polyoxyethylene ether, wherein the mass of the linear polyoxyethylene ether accounts for 10-90% of the total mass of the linear polyoxyethylene ether and the branched polyoxyethylene ether; The linear polyoxyethylene ether is a polyoxyethylene ether initiated by a C10-C14 linear fatty primary alcohol, wherein the number of ethoxy repeating units is 6-23; The branched polyoxyethylene ether is a polyoxyethylene ether initiated by C13 branched isomeric fatty primary alcohol, wherein the number of ethoxy repeating units is 6-12.

11. A method for preparing an oil-in-water polymer emulsion, characterized in that: The method comprises the following steps: The water-in-oil type polymer emulsion is mixed with the surfactant composition according to any one of claims 1 to 9, and then mixed with water to obtain the oil-in-water type polymer emulsion.

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