Non-organic silicon type defoaming agent and application thereof

Abstract

The invention belongs to the technical field of defoaming agents, and provides a non-organic silicon type defoaming agent and application thereof. The non-organic silicon type defoaming agent is prepared from 50 to 60 percent of polyether polyol, 10 to 20 percent of alkynediol polyoxyethylene ether and 20 to 40 percent of modified mineral oil. The polyether polyol containing two or three hydroxyl groups is used as a main component of the defoaming agent, the alkynediol polyoxyethylene ether and the isocyanate modified mineral oil are used as auxiliary materials, the three components have a mutual synergistic effect, the compatibility is good, and the rapid defoaming effect is achieved; the alkynediol polyoxyethylene ether can greatly reduce the dynamic surface tension, and quickly eliminate foams generated by air removal and the like due to liquid stirring and infiltration of the feed liquid on the surface of the glove between the glove and the feed liquid; hydrophobic silicon dioxide is replaced with isocyanate modified mineral oil, the defoaming capacity of the mineral oil is enhanced, glove surface defects caused by the hydrophobic silicon dioxide are avoided, and the yield is effectively increased.

Description

Technical Field

[0001] The present invention relates to the technical field of defoaming agents, in particular to a non-silicone defoaming agent and application thereof. Background Art

[0002] During the production of latex gloves, foam inevitably forms, requiring defoaming treatment. Failure to do so can severely impact glove quality, increase defective product rates, and increase production costs. Conventional silicone defoamers, when used in latex glove production, can cause craters on the glove surface, impacting glove quality. Currently, non-silicone defoamers, while offering excellent compatibility, are less effective and require high dosages, increasing production costs.

[0003] Therefore, there is an urgent need to develop non-silicone defoaming agents that can be used in the production process of latex gloves. Summary of the Invention

[0004] The object of the present invention is to provide a non-silicone defoaming agent and its application in view of the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The invention provides a non-organic silicon type defoamer, which comprises the following components in percentage by mass: 50-60% of polyether polyol, 10-20% of acetylene glycol polyoxyethylene ether, and 20-40% of modified mineral oil.

[0007] Preferably, the polyether polyol comprises one or more of polypropylene glycol, propylene glycol polyoxypropylene ether, glycerol polyoxypropylene ether and polyoxypropylene polyoxyethylene block polyether.

[0008] Preferably, the molecular weight of the polyether polyol is 2000-6000 Da.

[0009] Preferably, the acetylene glycol polyoxyethylene ether comprises octylene glycol polyoxyethylene ether and / or decylene glycol polyoxyethylene ether.

[0010] Preferably, the modified mineral oil is isocyanate modified mineral oil.

[0011] Preferably, the isocyanate-modified mineral oil comprises the following raw materials in percentage by mass: 90-98% mineral oil, 1-5% hydrogenated phenylmethane diisocyanate, and 1-5% monohydroxy fatty alcohol.

[0012] Preferably, the preparation method of the isocyanate-modified mineral oil comprises the following steps:

[0013] 1) mixing mineral oil and hydrogenated phenylmethane diisocyanate to obtain a mineral oil mixture;

[0014] 2) Add monohydroxy fatty alcohol dropwise to the mineral oil mixture to obtain isocyanate-modified mineral oil.

[0015] Preferably, the temperature of the mineral oil mixture in step 1) is 140-160°C.

[0016] Preferably, the dropping speed in step 2) is 0.02 to 0.5 g / min, and the dropping is carried out under stirring conditions at a stirring speed of 50 to 500 rpm.

[0017] The present invention also provides application of the non-silicone defoaming agent in the production of latex gloves.

[0018] Beneficial effects of the present invention:

[0019] The present invention uses a polyether polyol containing two or three hydroxyl groups as the main component of the defoamer, and uses acetylene glycol polyoxyethylene ether and isocyanate-modified mineral oil as auxiliary materials. The three components produce a synergistic effect, have good compatibility, and achieve a rapid defoaming effect. The acetylene glycol polyoxyethylene ether can greatly reduce the surface tension under dynamic conditions. When the gloves are in contact with the liquid, foam generated between the gloves and the liquid due to liquid agitation and the infiltration of the liquid into the glove surface to remove air can be quickly eliminated. The isocyanate-modified mineral oil is used as a synergist instead of hydrophobic silica to enhance the defoaming ability of the mineral oil, while avoiding surface defects of the gloves caused by the hydrophobic silica, thereby effectively improving the yield rate. DETAILED DESCRIPTION

[0020] The invention provides a non-organic silicon type defoamer, which comprises the following components in percentage by mass: 50-60% of polyether polyol, 10-20% of acetylene glycol polyoxyethylene ether, and 20-40% of modified mineral oil.

[0021] In the present invention, the non-silicone defoamer comprises the following components in percentage by mass: 50-60% of polyether polyol, preferably 52-57%, more preferably 55%; 10-20% of acetylene glycol polyoxyethylene ether, preferably 12-17%, more preferably 15%; and 20-40% of modified mineral oil, preferably 25-35%, more preferably 30%.

[0022] In the present invention, the polyether polyol preferably comprises one or more of polypropylene glycol, propylene glycol polyoxypropylene ether, glycerol polyoxypropylene ether and polyoxypropylene polyoxyethylene block polyether.

[0023] In the present invention, the molecular weight of the polyether polyol is preferably 2000 to 6000 Da, more preferably 3000 to 5000 Da, and even more preferably 4000 Da.

[0024] In the present invention, the acetylene glycol polyoxyethylene ether preferably comprises octylene glycol polyoxyethylene ether and / or decylene glycol polyoxyethylene ether.

[0025] In the present invention, the modified mineral oil is preferably isocyanate-modified mineral oil.

[0026] In the present invention, the isocyanate-modified mineral oil comprises the following raw materials in percentage by mass: mineral oil is preferably 90-98%, more preferably 92-97%, and more preferably 94%; hydrogenated phenylmethane diisocyanate is preferably 1-5%, more preferably 2-4%, and more preferably 3%; monohydroxy fatty alcohol is preferably 1-5%, more preferably 2-4%, and more preferably 3%.

[0027] In the present invention, the preparation method of the isocyanate-modified mineral oil preferably comprises the following steps:

[0028] 1) mixing mineral oil and hydrogenated phenylmethane diisocyanate to obtain a mineral oil mixture;

[0029] 2) Add monohydroxy fatty alcohol dropwise to the mineral oil mixture to obtain isocyanate-modified mineral oil.

[0030] In the present invention, the temperature of the mineral oil mixture in step 1) is preferably 140-160°C, more preferably 145-155°C, and even more preferably 150°C.

[0031] In the present invention, the dripping speed of step 2) is preferably 0.02 to 0.5 g / min, more preferably 0.05 to 0.3 g / min, and more preferably 0.1 to 0.2 g / min; the dripping is preferably carried out under stirring conditions, and the stirring speed is preferably 50 to 500 rpm, more preferably 150 to 400 rpm, and more preferably 250 to 350 rpm.

[0032] The present invention also provides application of the non-silicone defoaming agent in the production of latex gloves.

[0033] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0034] Example 1

[0035] Mix 390g of 15# white oil and 6g of hydrogenated phenylmethane diisocyanate and heat to 150°C to obtain a mineral oil mixture. Stir the mineral oil mixture at 180 rpm at 150°C. Add 6g of cyclohexanol dropwise to the mineral oil mixture at a rate of 0.08g / min. After the addition is complete, stop stirring and cool to room temperature to obtain a modified mineral oil, designated as modified mineral oil ①.

[0036] Mix 209 g of polypropylene glycol (molecular weight of polypropylene glycol is 2000 Da), 52.5 g of octyne glycol polyoxyethylene ether, and 138.5 g of modified mineral oil ①, and stir at 25°C and 500 r / min for 3 h to obtain a non-silicone defoaming agent.

[0037] Example 2

[0038] Mix 420g of 18# white oil and 6.3g of hydrogenated phenylmethane diisocyanate and heat to 150°C to obtain a mineral oil mixture. Stir the mineral oil mixture at 210 rpm at 150°C. Add 7.9g of dodecanol dropwise to the mineral oil mixture at a rate of 0.12g / min. After the addition is complete, stop stirring and cool to room temperature to obtain a modified mineral oil, designated as modified mineral oil ②.

[0039] Mix 220 g of propylene glycol polyoxyethylene ether (the molecular weight of propylene glycol polyoxyethylene ether is 3000 Da), 63 g of decynediol polyoxyethylene ether, and 117 g of modified mineral oil ②, and stir at 25° C. and 500 r / min for 3 h to obtain a non-silicone defoaming agent.

[0040] Example 3

[0041] Mix 460g of 15# white oil and 6.6g of hydrogenated phenylmethane diisocyanate and heat to 150°C to obtain a mineral oil mixture. Stir the mineral oil mixture at 230 rpm at 150°C. Add 8.6g of hexadecanol dropwise to the mineral oil mixture at a rate of 0.13g / min. After the addition is complete, stop stirring and cool to room temperature to obtain a modified mineral oil, labeled as modified mineral oil ③.

[0042] Mix 225 g of polyoxypropylene polyoxyethylene block polyether L61 (molecular weight of polyether L61 is 2000 Da), 48 g of decynediol polyoxyethylene ether, and 127 g of modified mineral oil ③, and stir at 500 r / min at 25°C for 3 h to obtain a non-silicone defoaming agent.

[0043] Comparative Example 1

[0044] The octynediol polyoxyethylene ether in Example 1 was omitted, and the rest were the same as in Example 1.

[0045] Comparative Example 2

[0046] The decynediol polyoxyethylene ether in Example 2 was omitted, and the rest were the same as in Example 2.

[0047] Comparative Example 3

[0048] The modified mineral oil ① in Example 1 is omitted, and the rest is the same as in Example 1.

[0049] Comparative Example 4

[0050] The modified mineral oil ③ of Example 3 is omitted, and the rest is the same as Example 3.

[0051] The performance tests were conducted on the non-silicone defoamers of Examples 1 to 3 and Comparative Examples 1 to 4. The performance test results are shown in Table 1.

[0052] The stability test steps are as follows: take 200g of non-silicone defoamer and place it in a 500mL transparent sample bottle, let it stand for 10 days, observe every day whether there is stratification, flocculation, etc., and record the time when stratification and flocculation occur.

[0053] The defoaming ability test steps are as follows: add 100g of non-silicone defoaming agent to 4L of latex glove production mother liquor (the production mother liquor of carboxyl nitrile latex SH-830 produced by Dongguan Shenghao Plastic Raw Materials Co., Ltd.) to obtain a slurry, immerse a glove model wearing latex gloves in the slurry and immediately remove it, and observe the elimination of foam on the surface of the latex gloves; then place the latex gloves at 105℃ and bake for 5 minutes to observe whether there are any defects on the surface of the latex gloves.

[0054] Table 1 Performance test results of non-silicone defoamers

[0055]

[0056]

[0057] As shown in Table 1, the non-silicone defoamer of the present invention, comprising a polyether polyol containing two or three hydroxyl groups, an acetylene glycol polyoxyethylene ether, and an isocyanate-modified mineral oil, exhibits high stability and strong defoaming ability without causing surface defects in the gloves. Comparative Examples 1 and 2, which omitted the acetylene glycol polyoxyethylene ether, produced defoamers with poor stability, significantly reduced defoaming ability, and the presence of craters on the glove surfaces. Comparative Examples 3 and 4, which omitted the isocyanate-modified mineral oil, exhibited good stability but significantly reduced defoaming ability, resulting in defects such as noticeable craters on the glove surfaces.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A non-silicone defoamer, characterized in that: The invention comprises the following components in percentage by mass: 50-60% of polyether polyol, 10-20% of acetylene glycol polyoxyethylene ether and 20-40% of modified mineral oil.

2. The non-silicone defoamer according to claim 1, characterized in that The polyether polyol comprises one or more of polypropylene glycol, propylene glycol polyoxypropylene ether, glycerol polyoxypropylene ether and polyoxypropylene polyoxyethylene block polyether.

3. The non-silicone defoamer according to claim 2, characterized in that The molecular weight of the polyether polyol is 2000-6000 Da.

4. The non-silicone defoamer according to claim 2 or 3, characterized in that The acetylene glycol polyoxyethylene ether comprises octyne glycol polyoxyethylene ether and / or decynediol polyoxyethylene ether.

5. The non-silicone defoamer according to claim 4, characterized in that The modified mineral oil is isocyanate modified mineral oil.

6. The non-silicone defoamer according to claim 5, characterized in that The isocyanate-modified mineral oil comprises the following raw materials in percentage by mass: 90-98% of mineral oil, 1-5% of hydrogenated phenylmethane diisocyanate, and 1-5% of monohydroxy fatty alcohol.

7. The non-silicone defoamer according to claim 5 or 6, characterized in that: The preparation method of the isocyanate-modified mineral oil comprises the following steps: 1) mixing mineral oil and hydrogenated phenylmethane diisocyanate to obtain a mineral oil mixture; 2) Add monohydroxy fatty alcohol dropwise to the mineral oil mixture to obtain isocyanate-modified mineral oil.

8. The non-silicone defoamer according to claim 7, characterized in that: Step 1) The temperature of the mineral oil mixture is 140-160°C.

9. The non-silicone defoamer according to claim 8, characterized in that: Step 2) The dropping speed is 0.02 to 0.5 g / min, and the dropping is carried out under stirring conditions with a stirring speed of 50 to 500 rpm.

10. Use of the non-silicone defoaming agent according to any one of claims 1 to 9 in the production of latex gloves.

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