CN113956722A

CN113956722A - PO film dripping agent coating liquid and production process thereof

Info

Publication number: CN113956722A
Application number: CN202111406561.8A
Authority: CN
Inventors: 骆增来; 骆曾圳; 顾晓东
Original assignee: Hangzhou Lin'an Lvyuan Additives Co ltd
Current assignee: Hangzhou Lin'an Lvyuan Additives Co ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-01-21

Abstract

The application relates to the technical field of coatings, and particularly discloses a PO film dripping agent coating liquid and a production process thereof, wherein the PO film dripping agent coating liquid comprises the following components in percentage by weight: 15-45% of nano aluminum sol, 12-15% of nano silicon dioxide, 11-13% of sodium alginate, 8-12% of polyvinylpyrrolidone, 2-8% of film forming agent, 0.5-2% of antioxidant, 1.5-3.5% of ultraviolet absorbent, 3-5% of dispersing agent and the balance of pure water. The utility model provides a nanometer alumina sol and sodium alginate mix can strengthen the stickness of coating liquid, and nanometer silica has great specific surface equally, therefore has very strong absorption and bearing capacity, improves dispersion properties, hydrophilic properties and the intensity of PO membrane coating liquid jointly to make the PO membrane go up adnexed water and spread and follow the membrane wall and drip downwards at PO membrane surface, reduce the formation of drop of water and lead to the fact the injury to crops.

Description

PO film dripping agent coating liquid and production process thereof

Technical Field

The application relates to the technical field of coatings, in particular to PO film dripping agent coating liquid and a production process thereof.

Background

The greenhouse can transmit light and keep warm, is a facility mainly used for cultivating plants, can provide a growth period of the greenhouse and increase the yield in seasons unsuitable for the growth of the plants, and is also used for cultivating or raising seedlings of plants such as vegetables, flowers, trees and the like in low-temperature seasons, so that the greenhouse becomes one of important facilities in modern agriculture.

The PO film coating liquid of the prior domestic and foreign technologies can basically meet the use requirements of a high-transparency multifunctional agricultural greenhouse film, PO is a general finger of polyolefin materials and comprises various high polymer polymers such as PE, PP, EPPE, POE, EVA and the like, the PO film is a greenhouse film produced by an external spraying and drying process, the transparency, the heat preservation performance, the continuous fog dissipation and the dripping capability of the PO film are outstanding, but after a period of use, the PO film coating liquid is difficult to be fully combined with the surface of a film due to the different polarities of externally coated dripping agents and base resin, and the PO film is easy to fall off under the washing of water, so that the condition that water drops are hung on the PO film is serious, and the phenomena of whitening of the film and shedding of the coating can occur sometimes.

Thus, there remains a need for PO film drip coating compositions that improve the adhesion between the drip and film.

Disclosure of Invention

In order to solve the problem that the PO film has serious water drop, the application provides a PO film dripping agent coating liquid and a production process thereof.

In a first aspect, the PO film drip agent coating solution provided by the present application adopts the following technical scheme:

a PO film dripping agent coating liquid comprises the following components in percentage by weight: 15-45% of nano aluminum sol, 12-15% of nano silicon dioxide, 11-13% of sodium alginate, 8-12% of polyvinylpyrrolidone, 2-8% of film forming agent, 0.5-2% of antioxidant, 1.5-3.5% of ultraviolet absorbent, 3-5% of dispersing agent and the balance of pure water.

By adopting the technical scheme, the nano-alumina sol has larger specific surface area and lower viscosity, the sodium alginate has higher viscosity and strong hydrophilicity, the viscosity of the coating solution can be enhanced by mixing the nano-alumina sol and the sodium alginate, and the nano-silica also has larger specific surface area, so that the coating solution has strong adsorption and bearing capacity, can be uniformly dispersed in the coating solution, and enhances the dispersibility and permeability of the coating solution. In addition, the dispersing agent can enhance the liquid stability of the coating liquid and prevent particles in the coating liquid from settling and condensing, and the nano aluminum sol, the polyvinylpyrrolidone and the dispersing agent are matched to improve the dispersing performance, the hydrophilic performance and the strength of the PO membrane coating liquid together, so that water attached to the PO membrane spreads on the surface of the PO membrane and drips downwards along the membrane wall, and the damage to crops caused by the formation of water drops is reduced.

When the water of the aluminum sol is evaporated, the colloid particles are firmly attached to the surface of an object, aluminum oxide combination is formed among the particles, the hardness is greatly improved, meanwhile, the nano silicon dioxide has a strong ultraviolet ray absorption effect, can well absorb and shield the ultraviolet ray absorption agent in cooperation, the light transmittance of the PO film is improved, and the nano silicon dioxide can act together with the antioxidant and the light stabilizer, so that the aging resistance of the PO film is improved, and the service life of the PO film is further prolonged.

And sodium alginate has good fluidity, sodium alginate, polyvinylpyrrolidone and film-forming agent are used in combination, so that the dispersion performance and stability of the PO film coating liquid can be improved, and sodium alginate and polyvinylpyrrolidone are used together to improve the dispersibility of the film-forming agent, so that the dripping effect of the PO film is uniformly distributed, and the dripping function and the persistence of the dripping function of the PO film are improved.

Preferably, the weight ratio of the polyvinylpyrrolidone to the nano silicon dioxide to the sodium alginate is 1:1-1.8:1-1.5

By adopting the technical scheme, the polyvinylpyrrolidone polar polymer molecular structure has good film forming property and hygroscopicity, and can better adsorb moisture on the surface of a membrane, and the surface of the nano-silica contains more polar groups, so that the polyvinylpyrrolidone can be adsorbed, the migration and loss rate of the polyvinylpyrrolidone in the PO membrane can be reduced, and the non-dripping persistence of the PO membrane can be further enhanced.

Particularly, the nano silicon dioxide has higher specific surface area, and sodium alginate has certain viscosity, so that the sodium alginate can bear more polyvinylpyrrolidone when being used in a matched manner, on one hand, the use efficiency of the polyvinylpyrrolidone can be improved, on the other hand, the migration rate of the polyvinylpyrrolidone can be improved, and the anti-fog dripping life of the film can be further prolonged. Meanwhile, the nano silicon dioxide can also enable the film to generate a barrier effect on infrared rays emitted from the ground at night, and can well control the infrared emission on the surface of the film, so that the heat insulation performance of the greenhouse film is improved.

Optionally, the particle size of the nano aluminum sol is 40-80 nm.

By adopting the technical scheme, the particle size of the nano aluminum sol is controlled to be 40-80nm, the specific surface area is large, the haze of the PO film is reduced, and the nano aluminum sol is better matched with nano silicon dioxide, polyvinylpyrrolidone and sodium alginate in a compatible mode, so that the dispersibility of the film forming agent and the stability of the coating liquid are improved, and the dripping effect of the PO film coating liquid is further improved. Meanwhile, after the water of the nano aluminum sol is evaporated, the surface of the membrane layer of the PO membrane is regularly and compactly arranged through the cooperation of the nano aluminum sol particles, and more light passes through the PO membrane.

Optionally, the ultraviolet absorbent is composed of one or more of UV531, UVP-327 and UV-9.

By adopting the technical scheme, the ultraviolet absorbent can better absorb ultraviolet rays, has heat sublimation resistance, washing resistance, gas fading resistance and mechanical property retentivity, has a remarkable synergistic effect when being used together with the antioxidant, and can better improve the thermal oxidation stability and the heat preservation performance of the PO film.

Optionally, the antioxidant is at least two of antioxidants 1010, 1076, KW-1 and KW-2.

By adopting the technical scheme, the effect of using at least two antioxidants is better than that of using one antioxidant alone, so that the compounding of the antioxidants has a synergistic effect, the antioxidants have better hydrolysis resistance, migration resistance and heat resistance, and the addition of the antioxidants is matched with the use of a light stabilizer, so that the comprehensive properties of the PO film, such as thermal stability, migration resistance and the like, are improved.

Optionally, the film forming agent is one or more of polyacrylate resin, polyurethane resin and polyvinyl alcohol resin.

By adopting the technical scheme, the films formed by the polyacrylate resin, the polyurethane resin and the polyvinyl alcohol resin have better bonding capability and film forming effect, and have better matching effect with sodium alginate and polyvinylpyrrolidone, so that the dripping effect of the PO film is improved, water on the PO film is spread on the surface of the PO film and drips downwards along the wall of the PO film, and the damage to crops caused by the formation of water drops is reduced.

Optionally, the dispersing agent is one or more of oxidized polyethylene wax, low molecular weight polyethylene wax, diisooctyl monobenzene phosphite and triphenyl phosphite.

By adopting the technical scheme, the dispersing agent has better lubricating property and transparency, and has better wettability and dispersibility in a system by matching with the nano aluminum sol, the polyvinylpyrrolidone and the film forming agent, so that the stability of the system is improved, and the uniformity and the hygroscopicity of the PO film are further improved.

In a second aspect, the present application provides a production process of the PO film drip agent coating solution, which adopts the following technical scheme:

a production process of PO film dripping agent coating liquid comprises the following steps:

s1, uniformly mixing polyvinylpyrrolidone, an antioxidant, nano aluminum sol, sodium alginate and an ultraviolet absorbent to obtain a mixed solution A;

s2, uniformly mixing the mixed solution A obtained in the step S1 with nano silicon dioxide, a dispersing agent and the balance of pure water to obtain a mixed solution B;

and S3, mixing the mixed solution B obtained in the step S2 with a film forming agent to obtain the PO film anti-drip agent coating solution.

Through adopting above-mentioned technical scheme, polyvinylpyrrolidone, nanometer aluminium sol, sodium alginate are mixed, have better intermiscibility, and cooperation nanometer silica and film-forming agent obtain PO membrane drainage agent coating liquid at last, and whole preparation technology is comparatively simple, can improve the cooperation effect between polyvinylpyrrolidone, sodium alginate and the nanometer silica simultaneously, obtains stable even PO membrane drainage agent coating liquid, and then improves PO membrane drainage agent coating liquid drainage effect.

Optionally, the mixing temperature in the step S1 is 60-80 ℃, and the mixing time is 30-45 min.

By adopting the technical scheme, the polyvinylpyrrolidone, the nano-alumina sol and the sodium alginate are uniformly mixed by controlling the mixing temperature and time, the stability of each component in the coating liquid and the matching effect among the components are further improved, and the antioxidant is matched with the ultraviolet absorbent to improve the thermal stability of the coating liquid.

Optionally, the mixing temperature in the step S3 is 50-70 ℃, and the mixing time is 15-35 min.

Through adopting above-mentioned technical scheme, the temperature and the time of adding of film-forming agent, control the mixture simultaneously stir the homogeneity that further improves the mixed liquid, and then improve the cooperation effect, obtain stable even PO membrane drip agent coating liquid to obtain more stable drip effect.

In summary, the present application has the following beneficial effects:

1. because the nanometer alumina sol of this application and sodium alginate mix can strengthen the viscidity of coating liquid, and nanometer silica has great specific surface equally moreover, therefore has very strong absorption and bearing capacity, not only can be even dispersion in the coating liquid, has strengthened the dispersibility and the permeability of coating liquid moreover. In addition, the dispersing agent can enhance the liquid stability of the coating liquid and prevent particles in the coating liquid from settling and condensing, and the nano aluminum sol, the polyvinylpyrrolidone and the dispersing agent are matched to improve the dispersing performance, the hydrophilic performance and the strength of the PO membrane coating liquid together, so that water attached to the PO membrane spreads on the surface of the PO membrane and drips downwards along the membrane wall, and the damage to crops caused by the formation of water drops is reduced.

2. Sodium alginate, polyvinylpyrrolidone and film former cooperation in this application are used, can improve dispersion properties, the stability of PO membrane coating liquid, and sodium alginate cooperates jointly with polyvinylpyrrolidone, improves the dispersibility of film former for the stream of PO membrane drips effect evenly distributed, and then improves the stream of PO membrane and drips the persistence of function and stream.

3. The application discloses polyvinylpyrrolidone polarity high polymer molecular structure has better film forming ability and hygroscopicity, and the moisture on adsorption film surface that can be better because the nanometer silica surface contains polar group more, can produce the adsorption to polyvinylpyrrolidone to reduce the migration and the loss rate of polyvinylpyrrolidone in the PO membrane, and then strengthen the no drop persistence of PO membrane.

Detailed Description

The present application will be described in further detail with reference to examples.

The starting materials used in the examples are all commercially available.

Examples 1 to 3

Example 1: the PO film dripping agent coating liquid comprises the specific components with the weight shown in Table 1, and the production process of the PO film dripping agent coating liquid comprises the following steps:

s1, mixing polyvinylpyrrolidone, antioxidants 1010 and 1076, nano-alumina sol, sodium alginate and UV531 at 70 ℃ for 40min to obtain a mixed solution A;

s2, uniformly mixing the mixed solution A obtained in the step S1 with nano silicon dioxide, oxidized polyethylene wax and the balance of pure water to obtain a mixed solution B;

and S3, mixing the mixed solution B obtained in the step S2 with polyacrylate resin at the temperature of 60 ℃ for 25min to obtain the PO film dripping agent coating solution.

Examples 2 to 3: a PO film drip agent coating liquid, which is different from example 1 in the respective components and weights, and included components and weights thereof are shown in table 1.

The following description will be made by taking example 1 as an example, in which the nano-alumina sol has a particle size of 60 nm.

TABLE 1 ingredients and weights thereof in examples 1-3

Example 4

A PO film dripping agent coating liquid is different from the coating liquid in the embodiment 1 in that the weight ratio of the polyvinylpyrrolidone, the nano silicon dioxide and the sodium alginate is 1:1: 1.5.

Example 5

A PO film drip agent coating solution, which is different from example 1 in that the weight ratio of polyvinylpyrrolidone, nano-silica and sodium alginate is 1:1.8: 1.

Example 6

A PO film drip agent coating solution, which is different from example 1 in that the weight ratio of polyvinylpyrrolidone, nano-silica and sodium alginate is 1:0.5: 2.

Example 7

A PO film drip agent coating solution, which is different from example 1 in that the particle size of the nano aluminum sol is 40 nm.

Example 8

A PO film drip agent coating solution, which is different from example 1 in that the particle size of the nano aluminum sol is 80 nm.

Example 9

A PO film drip agent coating solution, which is different from example 1 in that the particle size of the nano aluminum sol is 20 nm.

Example 10

A PO film drip agent coating solution, which is different from example 1 in that the particle size of the nano aluminum sol is 100 nm.

Example 11

A PO film drip agent coating liquid, which is different from example 1 in that the mixing temperature in step S1 is 60 ℃, and the mixing time is 45 min.

Example 12

A PO film drip agent coating liquid, which is different from example 1 in that the mixing temperature in step S1 is 80 ℃, and the mixing time is 30 min.

Example 13

A PO film drip agent coating liquid, which is different from example 1 in that the mixing temperature in step S3 is 50 ℃, and the mixing time is 35 min.

Example 14

A PO film drip agent coating liquid, which is different from example 1 in that the mixing temperature in step S3 is 70 ℃, and the mixing time is 15 min.

Comparative example

Comparative example 1

A PO film drip agent coating solution, which is different from example 1 in that it is composed of the following components: 10% of nano aluminum sol, 10% of nano silicon dioxide, 15% of sodium alginate, 6% of polyvinylpyrrolidone, 10% of film forming agent, 0.2% of antioxidant, 5% of ultraviolet absorbent, 2% of dispersing agent and 41.8% of pure water.

Comparative example 2

A PO film drip agent coating solution, which is different from example 1 in that it is composed of the following components: 50% of nano aluminum sol, 16% of nano silicon dioxide, 3% of sodium alginate, 15% of polyvinylpyrrolidone, 1% of film forming agent, 2.5% of antioxidant, 1% of ultraviolet absorbent, 6% of dispersing agent and 5.5% of pure water.

Comparative example 3

A PO film drip agent coating solution, which is different from example 1 in that the nano silica is replaced with an equal amount of pure water.

Comparative example 4

A PO film drip agent coating solution, which is different from example 1 in that sodium alginate is replaced with an equal amount of pure water.

Comparative example 5

A PO film drip application solution, which is different from example 1 in that polyvinylpyrrolidone was replaced with an equal amount of pure water.

Performance test

Static contact angle measurement experiment of PO film dripping agent coating liquid

Experimental samples: the coating liquids prepared in examples 1 to 14 and comparative examples 1 to 5 were uniformly coated on the PO base film so that the thickness of the resulting PO film was 0.15mm, and the PO film was cut into a 2cm × 3cm rectangular shape, and the modified graft PE film and the pure PE film were taken as a control sample 1 and a control sample 2, respectively.

An experimental instrument: SDC-200S contact angle measuring instrument (SINDIN, Chengdong precision instruments, Inc., Dongguan city) and digital display constant temperature water bath kettle (BHS-1, Baoli scientific research instruments, Inc., Jiangyin city).

The experimental method comprises the following steps: examples 1 to 14, comparative examples 1 to 5 and control samples 1 to 2 were each immersed in 100mL of water at 60 ℃ and water was changed every hour and sampled, and contact angle values at 0h, 3h, 9h, 24h, 9d, 27d, 60d, 90d, and 120d were measured and recorded for each experimental sample using a PG-X type dynamic and static surface contact angle meter.

The experimental results are as follows: the results of the static contact angle measurements for the experimental samples 1-14, the comparative samples 1-5, and the control samples 1-2 are shown in Table 2.

TABLE 2 results of static contact Angle measurements of examples 1-14, comparative examples 1-5, and control samples 1-2

As can be seen from the data in Table 2, the static contact angles of the experimental samples 1 to 14, the comparative samples 1 to 5 and the comparative samples 1 to 2 gradually increase with the passage of time, the static contact angles change faster around 0 to 3h, and the static contact angles at the later stage change less and gradually reach stability. Generally, through a static contact angle test of about 8h, the dripping effect and the quality condition of the PO film can be seen, and the dripping effect of the PO film with the static contact angle of 50 degrees is better. The static contact angles of the experimental samples 1-14 are lower when the contact angle is 120d, and the static contact angles are 43.1-43.3 degrees, which shows that the surface tension of the experimental samples 1-14 is lower and the hydrophilic stability is better. While comparative examples 1-5 have larger initial static contact angles, the static contact angle at 0-3h is 50.2-60.4 °; the static contact angles of the modified grafted PE film and the pure PE film in the comparison samples 1-2 are both close to 100 degrees and are relatively large and basically do not change along with time.

In addition, the contents of the components in examples 1 to 3 are different, and the static contact angle of 3h in example 1 is 39.1 degrees, which shows that the dropping performance of the PO film prepared in example 1 is better, examples 4 to 6 are different in the weight ratio of polyvinylpyrrolidone, nano-silica and sodium alginate, and the dropping performance of the PO film in example 6 is inferior to that of examples 4 to 5; the proportion of polyvinylpyrrolidone, nano-silica and sodium alginate is shown to influence the dripping performance of the membrane, examples 7-10 show that the particle sizes of the nano-alumina sol are different, when the nano-alumina sol with the particle size of 40-80nm is adopted, the specific surface area of the nano-alumina sol is larger, and when the nano-alumina sol is mixed with polyvinylpyrrolidone, the dispersibility and the permeability are better; when the particle size of the nano aluminum sol is 20nm and 100nm, the static contact angles of the nano aluminum sol in 3h are 39.5 degrees and 40.1 degrees respectively, which shows that the particle size of the nano aluminum sol has certain influence on the dripping performance of the film, examples 11 to 14 have different temperatures and times, and the static contact angle of the nano aluminum sol in 3h is 39.6 to 39.7 degrees, which shows that the temperature and the time in the preparation process have certain influence on the dripping performance of the film.

The numerical content of each component in comparative examples 1-2 is different from that of example 1, but the static contact angle at 3h is 50.2-50.3 degrees and is far larger than that in example 1, which shows that the content change of each component influences the dripping performance of the membrane, and comparative examples 3-5 respectively do not add nano silicon dioxide, sodium alginate and polyvinylpyrrolidone relative to example 1, but the static contact angle at 3h is 54.2-60.4 degrees, which shows that the content of single-component nano silicon dioxide, sodium alginate and polyvinylpyrrolidone influences the dripping performance of the membrane.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The PO film dripping agent coating liquid is characterized by comprising the following components in percentage by weight: 15-45% of nano aluminum sol, 12-15% of nano silicon dioxide, 11-13% of sodium alginate, 8-12% of polyvinylpyrrolidone, 2-8% of film forming agent, 0.5-2% of antioxidant, 1.5-3.5% of ultraviolet absorbent, 3-5% of dispersing agent and the balance of pure water.

2. A PO film drip coating fluid according to claim 1 characterized by: the weight ratio of the polyvinylpyrrolidone to the nano silicon dioxide to the sodium alginate is 1:1-1.8: 1-1.5.

3. A PO film drip coating fluid according to claim 1 characterized by: the particle size of the nano aluminum sol is 40-80 nm.

4. A PO film drip coating fluid according to claim 1 characterized by: the ultraviolet absorbent consists of one or more of UV531, UVP-327 and UV-9.

5. A PO film drip coating fluid according to claim 1 characterized by: the antioxidant is at least two of antioxidants 1010, 1076, KW-1 and KW-2.

6. A PO film drip coating fluid according to claim 1 characterized by: the film forming agent is one or more of polyacrylate resin, polyurethane resin and polyvinyl alcohol resin.

7. A PO film drip coating fluid according to claim 1 characterized by: the dispersing agent is one or more of oxidized polyethylene wax, low molecular weight polyethylene wax, diisooctyl phenyl phosphite and triphenyl phosphite.

8. A process for the production of a PO film drip coating according to any one of claims 1 to 7, wherein: the method comprises the following steps:

9. The production process of a PO film drip coating fluid according to claim 8, characterized by: the mixing temperature in the step S1 is 60-80 ℃, and the mixing time is 30-45 min.

10. The production process of a PO film drip coating fluid according to claim 8, characterized by: the mixing temperature in the step S3 is 50-70 ℃, and the mixing time is 15-35 min.