Modified polystyrene particles and preparation method and application thereof

Abstract

The present invention relates to the field of modified polystyrene materials, and more particularly to a modified polystyrene particle and a preparation method and application thereof, wherein the polystyrene particles are mixed with a modified mother liquor for preparation; the modified mother liquor comprises, by weight percentage, 0.5%-1.5% of a modifying agent A, 30%-40% of a modifying agent B, 0-5% of a modifying agent C, 1%-5% of a pigment, 3%-10% of a dispersant, 0.1%-1% of an emulsifier, and the remainder is distilled water. The preparation method of the modified polystyrene particles provided by the present invention uses the modified mother liquor to modify the surface of the polystyrene particles so that it has good hydrophilicity, so that it can be stably combined with a cement-based gel material, and the modified area ratio can reach more than 95%; the method has the advantages of being simple and efficient, and has a wide range of application prospects.

Description

Technical Field

[0001] The invention relates to the field of modified polystyrene materials, and in particular to modified polystyrene particles and a preparation method and application thereof. Background Art

[0002] Polystyrene particles refer to particles formed by pre-foaming of expandable polystyrene, referred to as EPS particles. Due to their good sound absorption, sound insulation, and heat insulation effects, they are widely used in related construction fields such as thermal insulation mortar and lightweight concrete. However, due to the hydrophobicity of polystyrene, it is not easy to combine with cement-based cementitious materials, resulting in the cracking of concrete materials with polystyrene particles as aggregates during use, which poses a great threat to the safety performance of the building. At present, there are few modification methods for polystyrene particles, or although there are modification methods involving polystyrene particles, the modification effect is not ideal, so it is necessary to find a simple and efficient modification method for polystyrene particles. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a modified polystyrene particle, characterized in that:

[0004] The polystyrene particles are mixed with a modified mother solution for preparation; the modified mother solution comprises, by weight percentage, 0.5%-1.5% of a modified agent A, 30%-40% of a modified agent B, 0-5% of a modified agent C, 1%-5% of a pigment, 3%-10% of a dispersant, 0.1%-1% of an emulsifier, and the balance is distilled water;

[0005] The modifying reagent A is: ,

[0006] ,

[0007] One or more of;

[0008] The structural formula of the modification reagent B is: .

[0009] The present invention modifies the surface of polystyrene particles by using a modified mother liquid. The modified reagent A in the modified mother liquid has a bifunctional structure with one end being hydrophilic and the other end being lipophilic, and has good compatibility with the polystyrene particle material, so that the modified reagent A and the polystyrene particles are combined into a whole, thereby effectively changing the interface state between the polystyrene particles and the cement base, making the surface of the polystyrene particles hydrophilic, and thus serving as the main material for modification; the modified reagent B has adhesion, which helps to make the modified reagent A more firmly attached to the surface of the polystyrene particles; the pigment is used to dye the surface of the polystyrene particles, and the pigment is used as a basis for judging the size of the modification ratio: the dyed polystyrene particles are successfully modified polystyrene particles, and the statistical ratio of the dyed polystyrene particles to the total polystyrene particles is the modification ratio.

[0010] In one embodiment, the modification ratio of the modified polystyrene particles is greater than 95%.

[0011] In one embodiment, the modified mother solution includes, by weight percentage, 0.8% modification agent A, 35% modification agent B, 3.5% modification agent C, 4% pigment, 6% dispersant, 0.2% emulsifier, and 50.5% distilled water.

[0012] In one embodiment, the modifying agent C is tripropylene glycol butyl ether and / or dipropylene glycol monobutyl ether;

[0013] In one embodiment, the pigment is a nano pigment or a color paste. Preferably, the particle size of the nano pigment is less than 100 nm, which can minimize the film thickness on the surface of the polystyrene particles, maximize the stability, and minimize the drying time.

[0014] In one embodiment, the dispersant is one or more of dispersant NNO, BYK-190, and BYK-192.

[0015] In one embodiment, the emulsifier is SR-10 and / or ER-20.

[0016] The present invention also provides a method for preparing the modified polystyrene particles. The modified polystyrene particles are prepared by immersing and stirring the polystyrene particles and the modified mother solution at a mass ratio of (6-10):1 for 10-40 minutes and then drying.

[0017] In one embodiment, the preparation method of the modified mother solution is: weigh the above raw materials, add the distilled water into a container, and start the stirrer, then add the emulsifier and the modifying agent A and mix them, then add the modifying agent C (if not added) and the modifying agent B and mix them, and finally add the pigment and the dispersant, mix them, and let them stand for use; the speed of the stirrer is 1200-2000r / min.

[0018] In one embodiment, the drying is air-drying at 50-75° C. for 15-30 min, and the air-drying process is accompanied by stirring.

[0019] The present invention also provides the use of the modified polystyrene particles as high-temperature heat insulation materials for buildings, ships, refrigeration, freezing chemical equipment, packaging materials for household appliances, instruments and meters, glass products, and as materials for producing disposable tableware.

[0020] Compared with the prior art, the preparation method of the modified polystyrene particles provided by the present invention uses a modified mother solution to modify the surface of the polystyrene particles so that the particles have better hydrophilicity, thereby being able to be firmly combined with the cement-based gel material, and the modification ratio can reach more than 95%; the method has the advantages of being simple and efficient, and has a broad application prospect. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. 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.

[0022] In the description of the present invention, it should be noted that all terms (including technical terms and scientific terms) used in the present invention have the same meanings as those generally understood by ordinary technicians in the field to which the present invention belongs, and should not be understood as limitations on the present invention; it should be further understood that the terms used in the present invention should be understood to have the same meanings as these terms in the context of this specification and in the relevant fields, and should not be understood in an idealized or overly formal sense, unless explicitly defined in this invention.

[0023] Example 1

[0024] The polystyrene particles are immersed and stirred with the modified mother solution at a ratio of 8:1 for 10-40 minutes, and then stirred and air-dried at 50°C for 30 minutes to obtain the modified polystyrene particles; the modified mother solution comprises, by weight percentage, 0.8% modification agent A, 35% modification agent B, 3.5% tripropylene glycol butyl ether, 4% nano pigment, 6% dispersant NNO, 0.2% SR-10, and 50.5% distilled water.

[0025] The modifying reagent A is .

[0026] The preparation method of the modified mother solution is as follows: weigh the above raw materials, add the distilled water into a container, start the stirrer, then add SR-10 and the modified agent A and mix them evenly, then add tripropylene glycol butyl ether and the modified agent B and mix them evenly, and finally add the nano pigment and the dispersant NNO and mix them evenly, and then stand for standby use; the speed of the stirrer is 1200r / min.

[0027] The percentage of dyed polystyrene particles to the total polystyrene particles was statistically analyzed, and the dyeing rate was 98.3%.

[0028] The dyed polystyrene particles were characterized and verified using an infrared spectrometer, which confirmed that the polystyrene particles were successfully hydrophilically modified.

[0029] In the prior art, it is difficult to intuitively and quickly determine the modification rate of polystyrene particles. In this embodiment, pigments can be directly added to the modified mother liquor, the polystyrene particles can be dyed with the colored modified mother liquor, and the dyeing rate of the polystyrene particles can be counted, thereby deriving a modification ratio of the polystyrene particles of 98.3%.

[0030] Example 2

[0031] The polystyrene particles are immersed and stirred with the modified mother solution at a ratio of 6:1 for 10-40 minutes, and then stirred at 60°C and air-dried for 20 minutes to obtain the modified polystyrene particles; the modified mother solution comprises, by weight percentage, 0.5% modification agent A, 30% modification agent B, 5% dipropylene glycol monobutyl ether, 1% color paste, 3% BYK-190, 1% SR-10, and 59.5% distilled water.

[0032] The modifying reagent A is .

[0033] The preparation method of the modified mother solution is as follows: weigh the above raw materials, add the distilled water into a container, start the stirrer, then add SR-10 and the modified agent A and mix them evenly, then add tripropylene glycol butyl ether and the modified agent B and mix them evenly, and finally add the color paste and BYK-190 and mix them evenly, and then stand for use; the speed of the stirrer is 1600r / min.

[0034] The percentage of dyed polystyrene particles to the total polystyrene particles was statistically calculated, and the dyeing rate was 96.2%, thus concluding that the modification ratio of the polystyrene particles was 96.2%.

[0035] Example 3

[0036] The polystyrene particles are immersed and stirred with the modified mother solution at a ratio of 10:1 for 10-40 minutes, and then stirred and air-dried at 75°C for 10 minutes to obtain the modified polystyrene particles; the modified mother solution comprises, by weight percentage, 1.5% modification agent A, 40% modification agent B, 5% nano pigment, 10% BYK-192, 0.1% ER-20, and 43.4% distilled water.

[0037] The modifying reagent A is .

[0038] The preparation method of the modified mother solution is: weigh the above raw materials, add the distilled water into a container, start the stirrer, then add ER-20 and the modification agent A and mix them evenly, then add the modification agent B and mix them evenly, and finally add the nano pigment and BYK-192 and mix them evenly, and then stand for use; the speed of the stirrer is 2000r / min.

[0039] The percentage of dyed polystyrene particles to the total polystyrene particles was statistically calculated, and the dyeing rate was 95.6%, thus concluding that the modification ratio of the polystyrene particles was 95.6%.

[0040] Comparative Example 1

[0041] The modifying reagent A in Example 1 was replaced with an equal amount of KH560, and the rest remained the same as in Example 1.

[0042] The ratio of the number of dyed polystyrene particles to the total number of polystyrene particles was statistically analyzed, and the dyeing rate was 97.1%, so the modification rate was 97.1%, which was lower than 98.3% in Example 1.

[0043] Comparative Example 2

[0044] The dispersant NNO in the modified mother liquor of Example 1 was replaced by an equal amount of sodium lignin sulfonate (CMN), and the rest was the same as Example 1.

[0045] Through testing, the modification rate is 93.6%.

[0046] Comparative Example 3

[0047] The emulsifier SR-10 in the modified mother solution of Example 1 was replaced with an equal amount of NP-11 (nonylphenol polyoxyethylene ether), and the rest was the same as in Example 1.

[0048] Through testing, the modification rate was 94.1%.

[0049] Take an equal amount of unmodified polystyrene particles (bulk density 8KG / m 3 ) and the modified polystyrene particles of Example 1 and Comparative Examples 1-3 were processed into test pieces of length * width * height = 40mm * 40mm * 20mm, respectively, and then cement mortar (42.5# silicate cement: medium sand: drinking water = 1:23:0.485) was made into test pieces of 70mm * 70mm * 20mm, and before the initial setting of the cement mortar, they were combined with the polystyrene particle test pieces to form composite test pieces, at an age of 28d, 6 test pieces were prepared for each group of composite test pieces, and the rest were subjected to tensile bond strength tests according to the method described in Article 10 of JGJ / T70-2009, and the test results are shown in Table 1:

[0050] Table 1 Test results of bonding strength between polystyrene particles and cement-based gel materials (unit: MPa)

[0051]

[0052] It can be seen from the data in Table 1 that the modified mother solution provided in this scheme can effectively hydrophilically modify the surface of polystyrene particles, thereby firmly combining the polystyrene particles with the cement-based gel material; and the selection of the dispersant and emulsifier used in this scheme is particularly critical to the modification rate and modification effect of the polystyrene particles.

[0053] Theta Flex contact angle measuring instrument was used to test the contact angles of the unmodified polystyrene particles and the modified polystyrene particles obtained in Example 1 and Comparative Examples 1-3. The contact angle of the unmodified polystyrene particles was 86°, the contact angle of the modified polystyrene particles in Example 1 was 12.5°, and the contact angles of the modified polystyrene particles in Comparative Examples 1-3 were 14.6°, 17.2°, and 15.8°, respectively. Compared with the modified polystyrene particles obtained in Example 1 and Comparative Examples 1-3, the modified polystyrene particles obtained in Example 1 have better hydrophilicity than Comparative Examples 1-3.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modified polystyrene particle, characterized in that: The polystyrene particles are mixed with a modified mother solution for preparation; the modified mother solution comprises, by weight percentage, 0.5%-1.5% of a modified agent A, 30%-40% of a modified agent B, 0-5% of a modified agent C, 1%-5% of a pigment, 3%-10% of a dispersant, 0.1%-1% of an emulsifier, and the balance is distilled water; The modifying reagent A is: , 、 One or more of; The structural formula of the modification reagent B is: ; The modifying agent C is tripropylene glycol butyl ether and / or dipropylene glycol monobutyl ether.

2. The modified polystyrene particles according to claim 1, characterized in that: The modification ratio of the modified polystyrene particles is greater than 95%.

3. The modified polystyrene particles according to claim 1, characterized in that: The modified mother solution comprises, by weight percentage, 0.8% of modification agent A, 35% of modification agent B, 3.5% of modification agent C, 4% of pigment, 6% of dispersant, 0.2% of emulsifier, and 50.5% of distilled water.

4. The modified polystyrene particles according to claim 1 or 3, characterized in that: The pigment is a nano pigment.

5. The modified polystyrene particles according to claim 1, characterized in that: The dispersant is one or more of dispersant NNO, BYK-190, and BYK-192.

6. The modified polystyrene particles according to claim 1, characterized in that: The emulsifier is SR-10 and / or ER-20.

7. The method for preparing modified polystyrene particles according to any one of claims 1 to 6, characterized in that: The modified polystyrene particles are obtained by immersing and stirring the polystyrene particles and the modified mother solution in a mass ratio of (6-10):1 for 10-40 minutes and then drying.

8. The method for preparing modified polystyrene particles according to claim 7, characterized in that: The preparation method of the modified mother solution is as follows: by weight percentage, 0.8% of the modifying agent A, 35% of the modifying agent B, 3.5% of the modifying agent C, 4% of the pigment, 6% of the dispersant, 0.2% of the emulsifier, and 50.5% of the distilled water are weighed, the distilled water is added into a container, and a stirrer is started, then the emulsifier and the modifying agent A are added and mixed, then the modifying agent C and the modifying agent B are added and mixed, and finally the pigment and the dispersant are added and mixed, and then the mixture is allowed to stand for use; the speed of the stirrer is 1200-2000 r / min.

9. The method for preparing modified polystyrene particles according to claim 7, characterized in that: The drying is performed by air drying at 50-75° C. for 15-30 minutes, and the air drying process is accompanied by stirring.

10. Use of the modified polystyrene particles according to any one of claims 1 to 6 as high-temperature insulation materials for buildings, ships, refrigeration / freezing chemical equipment, packaging materials for instruments and meters, glass products, and as materials for producing disposable tableware.

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