Disclosure of Invention
The invention aims to provide an artificial grass adhesive and a preparation method thereof, wherein 1, 6-diisocyanatohexane consumes hydrophilic groups in a system monomer, and a reticular structure polymer is formed in the system, so that water molecules are difficult to permeate into the cured adhesive; on the basis, octafluoropentyl methacrylate is used as an auxiliary material, a fluorine group is introduced, and a fluorocarbon chain segment surrounds a system without consuming a complete hydrophilic group, so that a shielding protection effect is formed, and the waterproof performance of the adhesive is enhanced; the polysorbate-20 and the sodium dodecyl polyoxyethylene ether sulfate are compounded, so that the stability of the prepared adhesive is synergistically improved, and the waterproof capability of the adhesive is further improved; the 3-glycidoxy propyl methyl diethoxy silane is used as one of the raw materials to make the adhesive have outstanding heat resistance. Solves the problems of poor waterproof and heat-resistant performances of the adhesive in the prior art.
The aim of the invention can be achieved by the following technical scheme:
an artificial grass adhesive comprises the following raw materials in parts by weight:
as a preferable technical scheme of the invention, the adhesive also comprises ammonia water.
As a preferable technical scheme of the invention, the initiator is potassium persulfate.
As a preferred embodiment of the present invention, the buffer is sodium bicarbonate.
As a preferable technical scheme of the invention, the preparation method of the adhesive comprises the following steps:
s1, 2/5 parts by weight of deionized water, polysorbate-20 and sodium dodecyl polyoxyethylene ether sulfate are stirred at a controlled temperature, methyl methacrylate, n-butyl acrylate, acrylic acid, allyl polyoxyethylene ether and 3-glycidyloxypropyl methyl diethoxysilane are added after the stirring is completed, and the mixture is stirred at a controlled temperature and a controlled speed to obtain an intermediate solution for later use;
s2, stirring the rest deionized water, the initiator and the buffer agent at a temperature control and speed control, controlling the temperature after stirring, then keeping the stirring speed unchanged, adding the intermediate liquid for standby in the step S1, heating when the intermediate liquid is added in half, stirring after heating is finished, and preserving the temperature after stirring is finished to obtain the liquid to be screened;
s3, naturally cooling the solution to be screened, then adding 1, 6-diisocyanatohexane and octafluoropentyl methacrylate, stirring, screening, and regulating the pH value with ammonia water to obtain the adhesive.
As a preferable technical scheme of the invention, the temperature of the temperature-controlled stirring in the step S1 is 24-28 ℃ and the time is 15-20min; the temperature and speed of the stirring are controlled to be 45-50 ℃, the speed is 700-750r/min and the time is 0.5-1h.
As a preferable technical scheme of the invention, the dripping mode of the intermediate liquid in the step S2 is that the dripping is completed within 2.5-3 hours at a constant speed.
As a preferable technical scheme of the invention, the temperature and speed of stirring in the step S2 is 25-28 ℃, the speed is 240-260r/min and the time is 10-15min; the temperature is controlled to be 70-75 ℃ after the stirring is completed; the intermediate liquid is heated to 80-85 ℃ when being added with half of the intermediate liquid; stirring time for stirring is 10-15min after the temperature is raised; the heat preservation time is 1.5-2h.
As a preferable technical scheme of the invention, the natural cooling in the step S3 is to naturally cool to below 35 ℃; the stirring time is 0.5-1h; sieving with 100-150 mesh sieve; the pH value is adjusted to 7-8.
The invention has the beneficial effects that:
(1) The invention adds 1, 6-diisocyanatohexane and octafluoropentyl methacrylate, so that the prepared adhesive has excellent waterproof property. The invention uses 1, 6-diisocyanatohexane to consume hydrophilic groups in the system monomers, reduces the content of the hydrophilic groups, and forms a net-shaped polymer in the system at the same time, so that water molecules are difficult to permeate into the cured adhesive; on the basis, octafluoropentyl methacrylate is used as an auxiliary material, a fluorine group is introduced, and a fluorocarbon chain segment surrounds a system without consuming a complete hydrophilic group, so that a shielding protection effect is formed, and the waterproof performance of the adhesive is enhanced.
(2) According to the invention, the nonionic emulsifier polysorbate-20 and the anionic emulsifier sodium dodecyl polyoxyethylene ether sulfate are used as the compound emulsifier, so that the stability of the prepared adhesive is synergistically increased, and the waterproof capability of the adhesive is further improved. The invention is characterized in that the polysorbate-20 and the sodium dodecyl polyoxyethylene ether sulfate are alternately adsorbed on the surfaces of the system particles, so that the distance between emulsifier ions on the surfaces of the system particles is increased, meanwhile, the electrostatic shielding effect of the polysorbate-20 is used for reducing the electrostatic tension on the surfaces of the particles, increasing the adsorption fastness, further increasing the emulsion stability of a finished product, and in addition, the polysorbate-20 can also form a hydration layer, so that the compound emulsifier adopted by the invention can enable electrostatic repulsive force between the particles and form a thicker hydration layer on the surfaces of the particles, thereby enabling the adhesive to have great stability and further increasing the waterproof capability of the adhesive.
(3) The invention adds 3-glycidol ether oxygen propyl methyl diethoxy silane, so that the prepared adhesive has outstanding heat resistance. This is because the 3-glycidoxypropyl methyl diethoxy silane is introduced into the epoxy group and the siloxane bond with higher bond energy, the epoxy group can be hydrolyzed and react in the system, the crosslinking degree in the system is increased, the movement of polymer molecular chains is limited, the siloxane bond energy is higher, and higher heat is required for destroying the siloxane bond, so that the 3-glycidoxypropyl methyl diethoxy silane increases the heat resistance of the adhesive glue by increasing the crosslinking degree of the system and the bond energy.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
An artificial grass adhesive comprises the following raw materials in parts by weight:
the adhesive also comprises ammonia water.
The preparation method of the adhesive comprises the following steps:
s1, stirring 2/5 parts by weight of deionized water, polysorbate-20 and sodium dodecyl polyoxyethylene ether sulfate at a temperature of 26 ℃ for 15min, adding methyl methacrylate, n-butyl acrylate, acrylic acid, allyl polyoxyethylene ether and 3-glycidyloxypropyl methyl diethoxysilane after stirring, and stirring for 1h at a temperature of 50 ℃ at a speed of 700r/min to obtain an intermediate solution for later use;
s2, stirring the rest deionized water, an initiator and a buffer at a temperature of 25 ℃ and a speed of 250r/min for 15min, controlling the temperature at 70 ℃ after stirring, keeping the stirring speed unchanged, dropwise adding the intermediate liquid prepared in the step S1 within 2.5h at a constant speed, heating to 85 ℃ when the intermediate liquid is added for half, stirring for 10min after heating, and preserving the temperature for 1.5h after stirring to obtain the liquid to be screened;
s3, naturally cooling the solution to be screened to below 35 ℃, then adding 1, 6-diisocyanatohexane and octafluoropentyl methacrylate, stirring for 0.5h, sieving with a 100-mesh sieve, and regulating the pH to 8 by using ammonia water to obtain the adhesive.
Example 2
An artificial grass adhesive comprises the following raw materials in parts by weight:
the adhesive also comprises ammonia water.
The preparation method of the adhesive comprises the following steps:
s1, stirring 2/5 parts by weight of deionized water, polysorbate-20 and sodium dodecyl polyoxyethylene ether sulfate at a temperature of 28 ℃ for 18min, adding methyl methacrylate, n-butyl acrylate, acrylic acid, allyl polyoxyethylene ether and 3-glycidyloxypropyl methyl diethoxysilane after stirring, and stirring at a temperature of 45 ℃ at a speed of 725r/min for 0.5h to obtain an intermediate solution for later use;
s2, stirring the rest deionized water, an initiator and a buffer at a temperature of 26 ℃ and a speed of 260r/min for 13min, controlling the temperature at 75 ℃ after stirring, keeping the stirring speed unchanged, dropwise adding the intermediate liquid prepared in the step S1 within 3h at a constant speed, heating to 80 ℃ when the intermediate liquid is added for half, stirring for 13min after heating, and preserving the temperature for 2h after stirring to obtain the liquid to be screened;
s3, naturally cooling the solution to be screened to below 35 ℃, then adding 1, 6-diisocyanatohexane and octafluoropentyl methacrylate, stirring for 1h, sieving with a 120-mesh sieve, and regulating the pH to 8 by using ammonia water to obtain the adhesive.
Example 3
An artificial grass adhesive comprises the following raw materials in parts by weight:
the adhesive also comprises ammonia water.
The preparation method of the adhesive comprises the following steps:
s1, stirring 2/5 parts by weight of deionized water, polysorbate-20 and sodium dodecyl polyoxyethylene ether sulfate at a temperature of 24 ℃ for 20min, adding methyl methacrylate, n-butyl acrylate, acrylic acid, allyl polyoxyethylene ether and 3-glycidyloxypropyl methyl diethoxysilane after stirring, and stirring at a temperature of 48 ℃ for 750r/min for 0.5h to obtain an intermediate solution for later use;
s2, stirring the rest deionized water, an initiator and a buffer at the temperature of 28 ℃ and the speed of 240r/min for 10min, controlling the temperature of 73 ℃ after stirring, keeping the stirring speed unchanged, dropwise adding the intermediate liquid prepared in the step S1 within 2.5h at a constant speed, heating to 83 ℃ when the intermediate liquid is added for half, stirring for 15min after heating, and preserving the temperature for 1.5h after stirring to obtain the liquid to be screened;
s3, naturally cooling the solution to be screened to below 35 ℃, then adding 1, 6-diisocyanatohexane and octafluoropentyl methacrylate, stirring for 1h, sieving with a 150-mesh sieve, and regulating the pH to 7 by using ammonia water to obtain the adhesive.
Comparative example 1
In comparison with example 3, the difference is that 1, 6-diisocyanatohexane was not added in comparative example 1, and the remaining operation steps and parameters were unchanged.
Comparative example 2
In comparison with example 3, the difference is that in comparative example 1, octafluoropentyl methacrylate was not added, and the remaining operation steps and parameters were not changed.
Comparative examples 3 to 4
The difference compared with example 6 is that the parts by weight of polysorbate-20 and sodium laureth sulfate in comparative examples 3-4 are shown in Table 1, and the remaining operation steps and parameters are unchanged.
TABLE 1
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Polysorbate-20 (parts by weight)
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Sodium dodecyl polyoxyethylene ether sulfate (weight portions)
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Comparative example 3
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0.9
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0
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Comparative example 4
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0
|
0.9 |
Comparative example 5
In comparison with example 3, the difference is that in comparative example 5, 3-glycidoxypropyl methyldiethoxysilane is not added, and the remaining operating steps and parameters are unchanged.
Performance detection
(1) And (3) water resistance test: weighing 30g of the adhesive prepared in examples 1-3 and comparative examples 1-4, placing in a glass culture dish, naturally drying to obtain a film, cutting the film into square samples of 15mm×15mm, weighing the sample mass (accurate to 0.001 g), placing in a culture dish containing distilled water, the distilled water is over the upper surface of the film, and placing in a roomAfter soaking for 24 hours at the temperature, the film is taken out, the water on the surface of the film is gently wiped off by filter paper, and the film is immediately weighed. The water resistance of the film is characterized by adopting the water absorption, each sample is tested for 3 times, the result is averaged, and the water absorption of the film is calculated by the formula: w= (m 1 -m 0 )/m 0 ×100%;
Wherein W is the water absorption of the film,%;
m 0 -initial mass of sample, g;
m 1 the mass of the sample after water absorption, g;
the results are shown in Table 2.
(2) Heat resistance test: 30g of the adhesive prepared in examples 1 to 3 and comparative example 5 were weighed in a glass petri dish, naturally dried, and made into a film, which was cut into square test pieces of 15mm×15mm, and shrinkage of the test pieces in MD and TD directions at 100℃for 1h, 130℃for 1h, and 160℃for 1h, respectively. The separator thermal shrinkage test involved both the machine direction and the transverse direction, and the results are shown in table 2.
TABLE 2
From the water absorption data of examples 1-3 and comparative examples 1-4 in Table 2, the adhesive prepared by the invention has excellent water resistance, because the hydrophilic groups in the monomers of the system are consumed by 1, 6-diisocyanatohexane, the content of the hydrophilic groups is reduced, and meanwhile, a net-shaped polymer is formed in the system, so that water molecules are difficult to penetrate into the cured adhesive; on the basis, octafluoropentyl methacrylate is used as an auxiliary material, a fluorine group is introduced, and a fluorocarbon chain segment surrounds a system without consuming a complete hydrophilic group, so that a shielding protection effect is formed, and the waterproof performance of the adhesive is enhanced; in addition, the invention takes polysorbate-20 and sodium dodecyl polyoxyethylene ether sulfate as a compound emulsifier to synergistically increase the stability of the prepared adhesive, thereby increasing the waterproof capability of the adhesive.
From Table 2, examples 1 to 3 and comparative example 5, the adhesive prepared in the present invention had outstanding heat resistance in terms of heat shrinkage in the longitudinal and transverse directions. This is because the 3-glycidoxypropyl methyl diethoxy silane is introduced into the epoxy group and the siloxane bond with higher bond energy, the epoxy group can be hydrolyzed and react in the system, the crosslinking degree in the system is increased, the movement of polymer molecular chains is limited, the siloxane bond energy is higher, and higher heat is required for destroying the siloxane bond, so that the 3-glycidoxypropyl methyl diethoxy silane increases the heat resistance of the adhesive glue by increasing the crosslinking degree of the system and the bond energy.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.