Low-foam alkali-resistant degreaser and application thereof

Abstract

The invention relates to a low-foam alkali-resistant degreaser and application thereof, and belongs to the technical field of printing and dyeing auxiliaries. The low-foam alkali-resistant degreaser comprises the following components in parts by weight: 10-30 parts of isomeric alcohol polyoxyalkyl ether; 10 to 30 parts of iso-tridecanol polyoxyethylene ether carboxylate; 10 to 30 parts of iso-tridecanol polyoxyethylene ether; 0.3 to 3 parts of a defoaming agent; 5-10 parts of an organic solvent; 0.5-3 parts of a bactericide; the total amount is 100 parts by weight. The low-foam alkali-resistant degreaser provided by the invention has the characteristics of alkali resistance, low foam and environmental protection, is widely applicable to degreasing, impurity removal and dyeing of various textile fibers, and is particularly applicable to a continuous refining process of pure cotton fibers and blended fabrics thereof and a degreasing and dyeing one-bath process of polyester fibers.

Description

Technical Field

[0001] The present application relates to the technical field of printing and dyeing auxiliaries, and in particular to a low-foaming alkali-resistant degreasing agent and its application. Background Art

[0002] In order to protect the fibers from damage during the weaving process, most textile fibers usually need to add a certain amount of spinning oil and slurry between the yarns. In addition, there are many natural impurities inside natural fibers such as cotton. These oils and impurities must be removed by the emulsification effect of deoiling agents during the pre-treatment process. Otherwise, the residual oils and impurities will directly affect the coloring of the fabric in the subsequent dyeing stage.

[0003] With the development of printing and dyeing auxiliaries, emulsified degreasers suitable for different application scenarios have been introduced one after another. For example, in the one-bath degreasing and dyeing process of synthetic fibers, there are one-bath dyeing degreasers with high temperature stability and low foaming properties; in the continuous refining process of cotton fabrics, there are alkali-resistant degreasers that can be used in high-concentration caustic soda solutions. However, developing a degreasing product that takes into account both high alkali resistance and low foaming properties has always been a major problem in the industry. In order to ensure high alkali resistance, traditional degreasers usually use surfactants with high EO numbers to increase their solubility in alkali solutions. As the number of EO increases, the height of the foam generated by the degreaser will also increase significantly. Therefore, it is very necessary to develop a pre-treatment degreaser suitable for multiple application scenarios. Summary of the invention

[0004] The purpose of the present application is to solve the problem that the existing degreasing agents for pre-printing and dyeing generally cannot take into account both low foaming and alkali resistance, and to propose a low foaming alkali-resistant degreasing agent and its application.

[0005] In the first aspect, the present application provides a low-foaming alkali-resistant degreasing agent, which adopts the following technical solution:

[0006] A low-foaming alkali-resistant degreasing agent comprises the following components in parts by weight:

[0007]

[0008]

[0009] Make up to 100 parts with water.

[0010] By adopting the above technical scheme, screening suitable raw materials and selecting appropriate ratios, the low-foaming and alkali-resistant degreasing agent prepared has more outstanding low-foaming and alkali resistance than commercially available degreasing agents. On this basis, it does not contain alkylphenol polyoxyethylene ether (APEO) and phosphorus, and meets environmental protection requirements.

[0011] Optionally, the isomeric alcohol polyoxyalkyl ether is synthesized using isomeric mixed alcohol as a starting agent, wherein the isomeric mixed alcohol is a mixture of dipropyl heptanol and isomeric tridecanol.

[0012] Optionally, the isomeric alcohol polyoxyalkyl ether is an EO-PO block copolymer, wherein the EO addition number is 5.0-9.0 and the PO addition number is 1.0-3.0.

[0013] By adopting the above technical solution and adding a nonionic surfactant with a special hydrophilic and hydrophobic end structure, the pour point of the system can be improved, foam can be reduced, and other properties can be achieved.

[0014] Optionally, the EO addition number of the isomeric tridecanol polyoxyethylene ether carboxylate is 4.0-9.0.

[0015] By adopting the above technical solution and adding the anionic surfactant isomeric tridecanol polyoxyethylene ether carboxylate, the alkali resistance of the compound system can be significantly improved.

[0016] Optionally, the EO addition number of the isomeric tridecanol polyoxyethylene ether is 3.0-7.0.

[0017] Optionally, the defoamer is a polyether defoamer. Preferably, the starting alcohol of the polyether defoamer is straight-chain octadecyl alcohol, hexadecanol, or a mixture of the two.

[0018] Optionally, the co-solvent is one or more of diethylene glycol monobutyl ether, ethylene glycol phenyl ether, diphenyl glycol methyl ether, diethylene glycol, isopropyl alcohol, and butyl ether.

[0019] Optionally, the fungicide is one or more of imidazoline, thiazoline, quinoline and triazole organic fungicides.

[0020] In a second aspect, the present application provides the use of a low-foaming alkali-resistant degreasing agent as described above in cotton fiber refining.

[0021] By adopting the above technical solution, adding the degreasing agent described in the first aspect of the present application during refining can significantly improve the wettability of cotton fibers, and is very suitable for the continuous high-alkali concentration refining process of cotton fibers.

[0022] In a third aspect, the present application also provides the use of the low-foaming alkali-resistant degreasing agent as described above in the degreasing and dyeing bath of polyester.

[0023] By adopting the above technical scheme and adding the degreasing agent described in the first aspect of the present application, the degreasing and dyeing bath of polyester fibers has good emulsification ability and anti-reverse staining performance for impurities and oil stains, and can also reduce the dyeing rate of the dye to a certain extent, thereby improving the levelness of the fabric sample.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The degreasing agent of the present application has both high alkali resistance and low foaming property, good emulsification property for impurities and oil stains, and excellent degreasing and anti-oil staining properties;

[0026] 2. The degreasing agent of the present application is suitable for various application scenarios such as degreasing and dyeing of polyester fibers in one bath, continuous refining of cotton fibers, etc.

[0027] 3. The degreasing agent of the present application can also reduce the dyeing rate of the dye to a certain extent in the degreasing and dyeing bath of polyester fibers, thereby improving the levelness of the fabric sample;

[0028] 4. The degreasing agent of this application does not contain APEO or phosphorus and meets environmental protection requirements. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical scheme of the present invention is now described in detail in conjunction with the following specific embodiments, but it should not be understood as limiting the applicable scope of the present invention.

[0030] Example 1 A low foaming alkali-resistant degreasing agent

[0031] Add 47 parts of water to the reactor, start stirring and heating, start insulation after the temperature in the reactor reaches 50°C, and add 15 parts of isomeric alcohol polyoxyalkyl ether (the mixing mass ratio of dipropyl heptanol and isomeric 13 alcohol is 5:5, the EO addition number is 5, and the PO addition number is 1), 10 parts of isomeric tridecanol polyoxyethylene ether (EO addition number is 7), and stir for 10 minutes; after stirring, turn off insulation, add 20 parts of isomeric tridecanol polyoxyethylene ether carboxylate (EO addition number is 4), 1 part of defoamer, 6 parts of cosolvent and 1 part of bactericide, and continue stirring for 20 minutes; turn off stirring, filter the material, and obtain a degreasing agent. In this embodiment, the defoamer is a polyether defoamer, the cosolvent is diethylene glycol monobutyl ether, and the bactericide is imidazoline.

[0032] Example 2 A low foaming alkali-resistant degreasing agent

[0033] Add 47 parts of water to the reactor, start stirring and heating, start insulation after the temperature in the reactor reaches 50°C, and add 20 parts of isomeric alcohol polyoxyalkyl ether (the mixing mass ratio of dipropyl heptanol and isomeric 13 alcohol is 3:7, the EO addition number is 6, and the PO addition number is 2), 15 parts of isomeric tridecanol polyoxyethylene ether (EO addition number is 5), and stir for 10 minutes; after stirring, turn off insulation, add 10 parts of isomeric tridecanol polyoxyethylene ether carboxylate (EO addition number is 6), 1.5 parts of defoamer, 5.5 parts of cosolvent and 1 part of bactericide, and continue stirring for 20 minutes; turn off stirring, filter the material, and obtain a degreasing agent. In this embodiment, the defoamer is a polyether defoamer, the cosolvent is diethylene glycol monobutyl ether, and the bactericide is imidazoline.

[0034] Example 3 A low foaming alkali-resistant degreasing agent

[0035] Add 47 parts of water to the reactor, start stirring and heating, start insulation after the temperature in the reactor reaches 50°C, and add 10 parts of isomeric alcohol polyoxyalkyl ether (the mixing mass ratio of dipropyl heptanol and isomeric 13 alcohol is 6:4, the EO addition number is 8, and the PO addition number is 3), 20 parts of isomeric tridecanol polyoxyethylene ether (EO addition number is 3), and stir for 10 minutes; after stirring, turn off insulation, add 15 parts of isomeric tridecanol polyoxyethylene ether carboxylate (EO addition number is 8), 2 parts of defoamer, 5 parts of organic solvent and 1 part of bactericide, and continue stirring for 20 minutes; turn off stirring, filter the material, and obtain a degreasing agent. In this embodiment, the defoamer is a polyether defoamer, the cosolvent is diethylene glycol monobutyl ether, and the bactericide is imidazoline.

[0036] Example 4 Performance Test

[0037] Two common degreasers on the market (hereinafter referred to as degreaser A and degreaser B) were used as control samples for performance comparison with Examples 1-3 of the present application; wherein, the main components of degreaser A are isomeric tridecanol polyoxyethylene ether and fatty alcohol polyoxyethylene ether carboxylate, and the main components of degreaser B are isomeric tridecanol polyoxyethylene ether and penetrant JFC.

[0038] 4.1 Foam performance

[0039] Prepare 1.0 g / L sample aqueous solution, take 50 mL of the solution to be tested and place it in a 100 mL stoppered measuring cylinder, shake it up and down vigorously for 10 times, and record the top scale (mL) of the foam generated by the solution and the top scale (mL) of the foam after 30 seconds.

[0040] The test results are shown in Table 1. It can be seen from Table 1 that the degreasing agents prepared by using the experimental examples 1-3 have less foam than degreasing agents A and B and have better low foaming properties.

[0041] Table 1

[0042] Sample name Example 1 Example 2 Example 3 Degreaser A Degreaser B Initial foam scale 64 60 58 84 79 30s foam scale 57 55 54 73 65

[0043] 4.2 Emulsification performance

[0044] Prepare 1.0g / L sample aqueous solution, take 30mL of the solution to be tested and 5# white mineral oil / mixed mechanical oil, put them into a 100mL stoppered measuring cylinder, shake it up and down vigorously for 10 times, let it stand for 60s, then repeat the shaking and let it stand. After the third shaking, place the measuring cylinder on a flat surface and start timing, recording the time required for the lower aqueous phase of the measuring cylinder to separate to the 10mL scale. The longer the time, the stronger the sample's emulsification ability for this type of oil.

[0045] The test results are shown in Table 2. It can be seen from Table 2 that the degreasing agents prepared by using the experimental examples 1-3 generally have longer stratification time than degreasing agents A and B, and have better emulsification performance.

[0046] Table 2

[0047] Sample name Example 1 Example 2 Example 3 Degreaser A Degreaser B 5# white mineral oil 960s 920s 900s 750s 700s Mixed machine oil 540s 520s 510s 560s 450s

[0048] 4.3 Alkali resistance

[0049] Add 1% by mass of the sample to be tested to the NaOH aqueous solution, stir thoroughly and let stand for 3 hours, observe the state of the solution, and record the maximum NaOH concentration range in which the solution does not stratify or flocculate.

[0050] The test results are shown in Table 3. It can be seen from Table 3 that the degreasing agent prepared by using the experimental examples 1-3 has a higher alkali resistance concentration than the degreasing agents A and B, and has good alkali resistance.

[0051] Table 3

[0052] Sample name Example 1 Example 2 Example 3 Degreaser A Degreaser B Maximum alkali concentration 80-90g / L 70-80g / L 70-80g / L 60-70g / L 30-40g / L

[0053] 4.4 Oil removal / oil resistance performance

[0054] Add 0.25g dark motor oil to the center of 5.0g polyester cloth and fix it at 180℃ for 1min to obtain oily cloth. Degreasing was performed under the following degreasing conditions: sample 2.0g / L, bath ratio 1:10, degreasing at 98℃ for 30min; the oil stain color depth and whiteness of the stained cloth after degreasing were compared to evaluate the degreasing / anti-oil backstaining performance of the degreasing agent on the stained cloth.

[0055] The test results are shown in Table 4. It can be seen from Table 4 that the degreasing agent prepared by using the present experimental examples 1-3 has a more obvious improvement in degreasing effect than degreasing agents A and B.

[0056] Table 4

[0057] Sample name Dark oil stain after degreasing Oil stain on the cloth after degreasing Example 1 The color of oil stains has been significantly reduced and turned light yellow The whiteness of the cloth did not decrease significantly Example 2 The color of oil stains has been significantly reduced and is now light yellow. The whiteness of the cloth did not decrease significantly Example 3 The color of oil stains has been significantly reduced and is now light yellow. The whiteness of the cloth did not decrease significantly Degreaser A The color of the oil stain has slightly decreased and is now brown. The cloth is heavily stained with oil and is yellow-brown Degreaser B The color of oil stains has been significantly reduced and turned light yellow The cloth is heavily stained with oil and is yellow-brown

[0058] Example 5 Application Test

[0059] 5.1 Scouring and application of pure cotton fabrics

[0060] The pure cotton woven fabric was immersed and rolled twice in a scouring solution of NaOH 50g / L and degreaser 4g / L, and steamed at 102℃ for 30min. After steaming, the fabric samples were treated in an infrared dyeing machine at 98℃ for 10min, and then washed with hot water and cold water at 70℃. The scouring fabric samples after drying were trimmed to the same appropriate size, and the capillary effect of the fabric samples was measured using a capillary effect tester, and the wetted height of the fabric samples 30min after the start of the test was recorded.

[0061] The test results are shown in Table 5. It can be seen from Table 5 that the degreasers prepared by the experimental examples 1-3 can improve the wettability of cotton fibers in the application of the pure cotton fabric refining process, and the improvement is more obvious than that of degreasers A and B.

[0062] Table 5

[0063]

[0064]

[0065] 5.2 Application of polyester degreasing and dyeing in one bath

[0066] Two drops of dark motor oil were added to three locations on a 5.0 g polyester fabric surface to prepare a one-bath oily fabric; the one-bath conditions for degreasing and dyeing were as follows: 2.0 g / L degreasing agent, dispersed dark blue HGL, dyeing concentration 2% owf (On Weight of Fabric), bath ratio 1:10, the degreasing and dyeing temperature was started from room temperature, raised to 130°C at 2°C / min, kept at that temperature for 1 hour, and then cooled to 60°C at 3°C / min, the fabric sample was taken out, washed and air-dried; 8 points were randomly selected on the air-dried fabric sample, the K / S value was tested, and the relative standard deviation of the measured values ​​was calculated, and the dyeing levelness was evaluated by the relative standard deviation (the smaller the relative standard deviation, the better the levelness).

[0067] The test results are shown in Table 6. It can be seen from Table 6 that the degreasing agent prepared by the experimental examples 1-3 is more conducive to the uniformity of dyeing than the degreasing agents A and B in the application of the polyester degreasing and dyeing one-bath process.

[0068] Table 6

[0069] Sample name Example 1 Example 2 Example 3 Degreaser A Degreaser B Relative standard deviation 0.060 0.072 0.065 0.134 0.252

[0070] Of course, the above description is only a specific embodiment of the present application and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the features and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A low-foaming alkali-resistant degreasing agent, characterized in that: The composition comprises the following parts by weight: 10-30 parts of isomeric alcohol polyoxyalkyl ether; 10-30 parts of isomeric tridecanol polyoxyethylene ether carboxylate; 10-30 parts of isomeric tridecanol polyoxyethylene ether; Defoaming agent 0.3-3 parts; 5-10 parts of cosolvent; 0.5-3 parts of fungicide; Make up to 100 parts with water.

2. A low-foaming alkali-resistant degreasing agent according to claim 1, characterized in that: The isomeric alcohol polyoxyalkyl ether is synthesized using isomeric mixed alcohol as a starting agent, wherein the isomeric mixed alcohol is a mixture of dipropyl heptanol and isomeric tridecanol.

3. A low-foaming alkali-resistant degreasing agent according to claim 1, characterized in that: The isomeric alcohol polyoxyalkyl ether is an EO-PO block copolymer, wherein the EO addition number is 5.0-9.0, and the PO addition number is 1.0-3.

0.

4. The low-foaming alkali-resistant degreasing agent according to claim 1, characterized in that: The EO addition number of the isomeric tridecanol polyoxyethylene ether carboxylate is 4.0-9.

0.

5. The low-foaming alkali-resistant degreasing agent according to claim 1, characterized in that: The EO addition number of the isomeric tridecanol polyoxyethylene ether is 3.0-7.

0.

6. The low-foaming alkali-resistant degreasing agent according to claim 1, characterized in that: The defoamer is a polyether defoamer.

7. The low-foaming alkali-resistant degreasing agent according to claim 1, characterized in that: The co-solvent is one or more of diethylene glycol monobutyl ether, ethylene glycol phenyl ether, diphenyl glycol methyl ether, diethylene glycol, isopropanol, and butyl ether.

8. The low-foaming alkali-resistant degreasing agent according to claim 1, characterized in that: The fungicide is one or more of imidazoline, thiazoline, quinoline and triazole organic fungicides.

9. Use of the low-foaming alkali-resistant degreasing agent according to any one of claims 1 to 8 in cotton fiber refining.

10. Use of the low-foaming alkali-resistant degreasing agent according to any one of claims 1 to 8 in degreasing and dyeing of polyester fibers in one bath.

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