阅读说明：本技术 一种防侧流烟气涂层及其制备方法 (Side-flow-preventing smoke coating and preparation method thereof ) 是由 曹祥薇 李哲铭 杨光远 侯宁 车静 于 2020-11-27 设计创作，主要内容包括：本发明属于高分子涂层领域,提供一种防侧流烟气涂层及其制备方法,该涂层包括聚氨酯丙烯酸酯预聚体、活性稀释剂和光引发剂,其中聚氨酯丙烯酸酯预聚体的质量份数为50-80份,活性稀释剂的质量份数为35-45份；光引发剂的质量份数为0.25-1份。其中聚氨酯丙烯酸酯预聚体由以下组分制备：异佛尔酮二异氰酸酯(IPDI)、聚丙二醇(PPG)、聚四氢呋喃(PTMG)、甲基丙烯酸羟乙酯(HEMA)和对苯二酚。本发明防侧流烟气涂层及其制备方法,采用UV固化方式,固化速率快,同时能够有效改进滤嘴部分对侧流烟的隔离效果。(The invention belongs to the field of polymer coatings, and provides a lateral flow smoke prevention coating and a preparation method thereof, wherein the coating comprises 50-80 parts by mass of polyurethane acrylate prepolymer, 35-45 parts by mass of reactive diluent; the mass portion of the photoinitiator is 0.25-1. The polyurethane acrylate prepolymer is prepared from the following components: isophorone diisocyanate (IPDI), polypropylene glycol (PPG), Polytetrahydrofuran (PTMG), hydroxyethyl methacrylate (HEMA) and hydroquinone. According to the coating for preventing sidestream smoke and the preparation method thereof, a UV curing mode is adopted, the curing speed is high, and the isolation effect of the filter tip part on sidestream smoke can be effectively improved.)

1. A lateral-flow-preventing smoke coating is characterized in that: the side-flow smoke prevention coating comprises 50-80 parts by weight of polyurethane acrylate prepolymer, 35-45 parts by weight of reactive diluent and a photoinitiator; the mass portion of the photoinitiator is 0.25-1; the polyurethane acrylate prepolymer is prepared from the following components: 80-120 parts of isophorone diisocyanate, 10-30 parts of polypropylene glycol, 5-25 parts of polytetrahydrofuran, 5-25 parts of hydroxyethyl methacrylate and 0.1-0.5 part of hydroquinone, wherein the weight parts of the components are counted.

2. The sidestream smoke prevention coating of claim 1, wherein: the photoinitiator is one or a mixture of 2-hydroxy-2-methyl-1-phenyl-1-acetone and 1-hydroxycyclohexyl phenyl ketone.

3. The sidestream smoke prevention coating of claim 1, wherein: the active diluent is one or a mixture of more of methoxy polyethylene glycol monoacrylate, tetraethylene glycol dimethacrylate, triethylene glycol dimethacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate and trimethylolpropane triacrylate.

4. A preparation method of a lateral-flow-preventing smoke coating is characterized by comprising the following steps:

(1) preparing a polyurethane acrylate prepolymer: sequentially adding 80-120 parts of isophorone diisocyanate, 10-30 parts of polypropylene glycol and 5-25 parts of polytetrahydrofuran into a three-neck flask containing 300 ml of THF solvent in sequence, mixing for 30 min at the stirring speed of 150-180 r/min, and continuously introducing nitrogen in the process; stirring for 30 mins, heating the mixture to 70 ℃ at the speed of 5 ℃/min, continuously reacting for 4h, and keeping nitrogen continuously introduced in the process; after reacting for 4 hours, cooling the reaction system to 40 ℃, and then adding 5-25 parts of hydroxyethyl methacrylate and 0.1-0.5 part of hydroquinone into the mixed solution; reacting for 4 hours at the temperature of 40 ℃, and keeping the continuous introduction of nitrogen in the process; after the reaction is finished, heating and volatilizing the residual THF solvent to obtain a polyurethane acrylate prepolymer;

(2) weighing 50-80 parts of polyurethane acrylate prepolymer, adding 35-45 parts of reactive diluent monomer and 0.25-1 part of photoinitiator, and stirring and dissolving uniformly at room temperature to obtain UV-curable polyurethane acrylate;

(3) immersing the acetate fiber tow filter rod into the prepared UV-curable polyurethane acrylate, and then placing the immersed acetate fiber tow under ultraviolet light, wherein the intensity is as follows: 300 Wm at 365 nm^-2And curing for 2-10 seconds.

Technical Field

The invention belongs to the field of polymer coatings, and particularly relates to a side-flow smoke prevention coating and a preparation method thereof.

Background

At present, cigarette filters on the market can only filter mainstream smoke. There is no good solution to the sidestream smoke suppression. Due to the existence of side stream smoke, after long-term smoking, substances in the smoke contact the skin for a long time to cause finger yellowing; moreover, long-term sidestream smoke can also cause harm to people who do not smoke around.

Although the market has a certain cognition on the hazard of the sidestream smoke, the current means for inhibiting the sidestream smoke is still in the aspect of cigarette paper, and a plurality of methods for inhibiting the sidestream smoke through the cigarette paper are developed at home and abroad through modifying the cigarette paper. The main research contents comprise the influence of cigarette paper quantification, air permeability and the like on the release amount of acidic flavor components in the mainstream smoke of the cigarette, the air permeability of the cigarette paper, the internal quality of the cigarette and the like. These methods all reduce sidestream smoke generation by modifying the wrapper, but they are not effective and require more optimal methods to improve sidestream smoke protection. Furthermore, measures for preventing sidestream smoke through modification of smoke filters are still in the market place.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a sidestream smoke prevention coating and a preparation method thereof, wherein a UV curing mode is adopted, the curing speed is high, and the sidestream smoke isolation effect of a filter tip part can be effectively improved.

The object of the invention is achieved by the following technical measures.

The invention provides a side-flow smoke prevention coating which comprises 50-80 parts by mass of polyurethane acrylate prepolymer, 35-45 parts by mass of reactive diluent and a photoinitiator; the mass portion of the photoinitiator is 0.25-1.

The polyurethane acrylate prepolymer is prepared from the following components: 80-120 parts of isophorone diisocyanate (IPDI), 10-30 Parts of Polypropylene Glycol (PPG), 5-25 parts of Polytetrahydrofuran (PTMG), 5-25 parts of hydroxyethyl methacrylate (HEMA) and 0.1-0.5 part of hydroquinone, wherein the components are calculated by weight parts.

Wherein the photoinitiator is one or a mixture of 2-hydroxy-2-methyl-1-phenyl-1-acetone (1173) and 1-hydroxycyclohexyl phenyl ketone (184).

The reactive diluent is one or a mixture of methoxy polyethylene glycol monoacrylate, tetraethylene glycol dimethacrylate, triethylene glycol dimethacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate and trimethylolpropane triacrylate.

The invention also provides a preparation method of the lateral flow smoke prevention coating, which comprises the following steps:

(1) preparing a polyurethane acrylate prepolymer: 80-120 parts of isophorone diisocyanate, 10-30 parts of polypropylene glycol and 5-25 parts of polytetrahydrofuran are sequentially added into a three-neck flask (500 ml) containing 300 ml of THF solvent in the above order, and mixed for 30 min at the stirring rate of 150-180 r/min, and nitrogen is continuously introduced in the process. After stirring for 30 mins, the mixture was heated to 70 ℃ at 5 ℃/min and the reaction was continued for 4h, while maintaining a continuous nitrogen bleed. After reacting for 4h, cooling the reaction system to 40 ℃, then adding 5-25 parts of hydroxyethyl methacrylate and 0.1-0.5 part of hydroquinone into the mixed solution, reacting for 4h at 40 ℃, and keeping the continuous introduction of nitrogen in the process. And after the reaction is finished, heating and volatilizing the residual THF solvent to obtain the urethane acrylate prepolymer.

(2) Weighing 50-80 parts of polyurethane acrylate prepolymer according to the formula of the coating, adding 35-45 parts of reactive diluent monomer and 0.25-1 part of photoinitiator, and stirring and dissolving uniformly at room temperature to obtain the UV-curable polyurethane acrylate.

(3) Mixing cellulose acetate filamentsThe bundle filter rods were immersed in the prepared UV-curable urethane acrylate, and the immersed cellulose acetate tow was then exposed to ultraviolet light (intensity: 300 Wm at 365 nm)^-2) Curing for 2-10 seconds.

Compared with the prior art, the coating for preventing the side-flow smoke has excellent smoke isolation performance and good bonding performance, the forming process adopts a UV curing mode, the curing speed is high, the curing speed only needs 3-5 seconds, and the performance of preventing the side-flow smoke and the production efficiency of products are effectively improved. Meanwhile, the side-flow-preventing smoke coating disclosed by the invention has a very high decomposition temperature, and the eighteen aldehyde ketone and pentabenzene test results meet the environmental protection requirement.

Drawings

Fig. 1 is a thermal exploded view of the coating of example 1.

Fig. 2 is a thermal exploded view of the coating of example 2.

Fig. 3 is a thermal exploded view of the coating of example 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the implementation methods of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention is further illustrated below with reference to examples 1-6 shown in Table 1.

As shown in table 1, the coating of the present invention comprises the following main raw materials:

table 1 orthogonal formulations of experimental materials

The preparation of the side-flow-preventing smoke coating is carried out according to the mixture ratio shown in the table 1, and the preparation steps are as follows:

(1) preparing a polyurethane acrylate prepolymer: 80-120 parts of isophorone diisocyanate, 10-30 parts of polypropylene glycol and 5-25 parts of polytetrahydrofuran are sequentially added into a three-neck flask (500 ml) containing 300 ml of THF solvent in the above order, and mixed for 30 min at the stirring rate of 150-180 r/min, and nitrogen is continuously introduced in the process. After stirring for 30 mins, the mixture was heated to 70 ℃ at 5 ℃/min and the reaction was continued for 4h, while maintaining a continuous nitrogen bleed. After reacting for 4h, cooling the reaction system to 40 ℃, and then adding 5-25 parts of hydroxyethyl methacrylate and 0.1-0.5 part of hydroquinone into the mixed solution. The reaction was continued at 40 ℃ for 4 hours while keeping the nitrogen gas continuously introduced. And after the reaction is finished, heating and volatilizing the residual THF solvent to obtain the urethane acrylate prepolymer.

(2) Weighing corresponding polyurethane acrylate prepolymer according to the formula (shown in table 1) of the coating, adding corresponding parts by weight of reactive diluent monomer and different parts by weight of photoinitiator, and stirring and dissolving uniformly at room temperature to obtain the UV-curable polyurethane acrylate.

(3) The acetate tow filter rod is immersed in the prepared UV-curable urethane acrylate for different times (5 s, 10s, 15s, 20 s), and then the immersed acetate tow is placed under ultraviolet light (intensity: 300 Wm at 365 nm)^-2) Curing for 2-10 seconds.

The samples of examples 1 to 6 thus obtained were subjected to various performance tests, mechanical property tests, eighteen aldehyde ketone and pentacene tests, odor tests, etc., and the test results are shown in tables 2 to 5.

TABLE 2 data for the comprehensive Performance test of examples 1-6

Table 3 mechanical property test data of examples 1-6 under 7 x 24 hours, 105 ℃ aging conditions

Table 4-1 eighteen aldehyde ketone and pentabenzene test data for example 1

Table 4-2 eighteen aldehyde ketone and pentabenzene test data for example 2

Tables 4-3 eighteen aldehyde ketone and pentabenzene test data for example 3

Tables 4-4 eighteen aldehyde ketone and pentabenzene test data for example 4

Tables 4-5 eighteen aldehyde ketone and pentabenzene test data for example 5

Tables 4-6 eighteen aldehyde ketone and pentabenzene test data for example 6

Table 5 odor test data for examples 1-6

According to the experimental results of examples 1-6, it was found that: (1) the coating in the embodiment 1-6 can reach the curing speed of 3-5 seconds under the UV curing condition, and can effectively meet the requirements of quick curing and quick production of tobacco products. Among them, examples 2 and 3, the coating has more excellent smoke barrier property and peel strength, and under the condition of aging for 7 days at 105 ℃, the coating also well maintains the peel strength and shear strength, and meets the requirement of long-term use. (2) The odor performance of the coating can reach the characteristics of low odor and environmental protection, and the requirement of environmental protection is met. (3) The decomposition temperatures of the coatings were tested and found to be at least 350 c above, with example 3 reaching decomposition temperatures above 400 c.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

The scope of the invention is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present invention by those skilled in the art without departing from the scope and spirit of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.