A bulletproof and explosion-proof coating and preparation method thereof

Abstract

The invention provides a bulletproof and explosion-proof coating and a preparation method thereof, wherein the bulletproof and explosion-proof coating comprises: 40-50 parts by weight of polyurea resin, 1-3 parts by weight of a dispersing aid, 1-2 parts by weight of an anti-settling aid; 20-35 parts by weight of a bulletproof filler; 1-3 parts by weight of a defoamer; 10-20 parts by weight of a coloring pigment; 20-30 parts by weight of a modified curing agent; and the molecular weight of the polyurea resin is adjusted to 30000-50000. By adjusting the molecular weight of the polyurea resin, the polyurea resin takes into account both rigidity and toughness in this molecular weight range, so that the resin itself also provides strong mechanical strength, and a good bulletproof effect can be achieved by combining with the filler.

Description

Technical Field

[0001] The invention relates to the field of chemical coatings, and in particular to a bulletproof and explosion-proof coating and a preparation method thereof. Background Art

[0002] In the military field and some fields with safety requirements, there is a demand for bulletproof and explosion-proof; there are many technical implementation schemes for bulletproof and explosion-proof, which can meet different level requirements, and of course the cost of implementation is also different. Polyurethane and polyurea have certain bulletproof, explosion-proof and anti-corrosion effects. For example, the prior patent CN108384440A discloses a bulletproof, explosion-proof and anti-corrosion coating, which is mainly composed of polyurethane and polyurea, and is also equipped with a certain proportion of conductive polymer, aerogel, compatibilizer, defoamer, dispersant, leveling agent and color powder. It mainly utilizes polyurethane and polyurea to compound and provide comprehensive performance, and has the advantage of light weight as a whole, but its product performance still has room for further improvement. In addition, solvent-free polyurethane or polyurea resin is used as a film-forming material, and special powder fillers such as nanomaterials or silicon micropowder aerosol are used. These fillers themselves are expensive, have strong specificity and poor versatility. To obtain good performance, special raw materials need to be used. For example, the filler used in patent CN108192493B must be produced exclusively, which is expensive. Once the supply of raw materials is interrupted, the production of coating products will stop. In addition, some existing product formulas have many special requirements for production. For example, the high oil absorption of nanomaterials and silica sol has a great impact on the viscosity of the coating, which requires continuous adjustment to adapt to the spraying equipment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to realize that a coating having good toughness, low viscosity, sprayability and bulletproof and explosion-proof effects can be achieved by adding common fillers to polyurea.

[0004] In order to solve the above problems, the present invention provides a bulletproof and explosion-proof coating, which is characterized by comprising the following components:

[0005]

[0006]

[0007] The molecular weight of the polyurea resin is adjusted to 30,000 to 50,000.

[0008] The bulletproof and explosion-proof coating is characterized in that the curing agent is polyester-modified hexamethylene isocyanate, and the linear molecular toughness of polyester is used to improve the mechanical strength of the paint film.

[0009] The bulletproof and explosion-proof coating is characterized in that the bulletproof filler is one or more of mica powder, talcum powder, feldspar powder, and glass fiber powder; the filamentous and flaky structures of the powder are used to disperse mechanical stress, thereby achieving the effect of enhancing the toughness of the paint film.

[0010] The bulletproof and explosion-proof coating is characterized in that the bulletproof filler is glass fiber powder, natural mineral talcum powder and feldspar powder.

[0011] The bulletproof and explosion-proof coating is characterized in that titanium dioxide and phthalocyanine blue are mixed with polyurea resin in a weight ratio of 10:0.5.

[0012] The implementation of the present invention has the following beneficial effects: by adjusting the molecular weight of the polyurea resin to 30,000 to 50,000, the polyurea resin has both rigidity and toughness within this molecular weight range, so that the resin itself also provides strong mechanical strength, and a good bulletproof effect can be achieved by combining with the above-mentioned filler. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the frontal impact point after the gunfire test after the bulletproof and explosion-proof coating was sprayed;

[0014] Figure 2 It is a schematic diagram of the impact point of the reverse side after the gunfire test after the bulletproof and explosion-proof coating was sprayed. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0016] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0017] The molecular weight of the polyurea resin is adjusted to 30,000-50,000 by using different high molecular weight polymers; 40-50 parts by weight of the polyurea resin after the molecular weight adjustment, 1-3 parts by weight of the dispersing aid, 1-2 parts by weight of the anti-settling aid, 20-35 parts by weight of the bulletproof filler and 10-20 parts by weight of the coloring pigment are mixed, and stirred at a high speed of 1000-1500 r / min for 30-50 minutes (preferably: 1300 r / min, stirring for 40 minutes). After the fineness is qualified, 1-3 parts by weight of the defoamer and the anti-sagging aid are added and mixed to form the main agent; the main agent and the curing agent are respectively sent to the nozzle through a separate pipeline at high pressure, and are fully mixed in the mixing chamber of the nozzle to form a directly sprayable bulletproof and explosion-proof coating. The curing agent uses polyester modified hexamethylene isocyanate, and the linear molecular toughness of the polyester is used to improve the mechanical strength of the paint film. The bulletproof filler is one or more of mica powder, talc powder, feldspar powder, and glass fiber powder; the filamentous and flaky structures of the powder are used to disperse mechanical stress, thereby enhancing the toughness of the paint film. The bulletproof filler is glass fiber powder, natural mineral talc powder, and feldspar powder. Titanium dioxide and phthalocyanine blue are mixed with polyurea resin in a weight ratio of 10:0.5. By adjusting the molecular weight of polyurea resin to 30,000 to 50,000, polyurea resin takes into account both rigidity and toughness in this molecular weight range, so that the resin itself also provides strong mechanical strength, and a good bulletproof effect can be achieved with the above fillers.

[0018] The main agent and curing agent are delivered to the nozzle through separate pipelines at high pressure. After being fully mixed in the mixing chamber of the nozzle, they are directly sprayed on the steel plate or aluminum substrate. Taking room temperature of 23°C as an example, complete hardening and drying can be achieved in about 40 minutes without additional heating.

[0019] The C Company of the Special Operations Battalion B of the Special Operations Brigade of the Army conducted a shooting test on the painted steel plate. The test used a 191-type 5.8mm automatic rifle and a 92-type 5.8mm pistol, and the penetration data at 100 meters, 50 meters, 25 meters and 25 meters, 15 meters, and 5 meters were statistically analyzed. Figure 1 is a schematic diagram of the frontal impact point after the gunfire test after the bulletproof and explosion-proof coating was sprayed; Figure 2 This is a schematic diagram of the impact point of the reverse side after the gunfire test after spraying the bulletproof and explosion-proof coating:

[0020] (I) Type 191 5.8mm automatic rifle

[0021] B3 impact point, 100 meters away, the inner diameter of the bullet hole is about 7mm, the depth is 6mm, no penetration, and there is a pinhole at the bottom of the plate;

[0022] B2 impact point, 50 meters, bullet hole inner diameter about 7mm, depth 11mm, no penetration, pinhole at the bottom of the plate;

[0023] B1 impact point, 25 meters, the inner diameter of the bullet hole is about 7mm, the depth is 14mm, no penetration, there is a pinhole at the bottom of the plate.

[0024] (II) Type 92 5.8mm pistol

[0025] S3 impact point, 25 meters away, the inner diameter of the bullet hole is about 6mm, the depth is 6mm, no penetration, there is a pinhole at the bottom of the plate, but due to the low initial velocity of the pistol bullet, the process of entering the steel plate is not thorough enough, and the bullet hole is deformed;

[0026] S2 impact point, 15 meters away, the inner diameter of the bullet hole is about 6mm, the depth is 5cm, no penetration, there is a pinhole at the bottom of the plate, but due to the low initial velocity of the pistol bullet, the process of entering the steel plate is not thorough enough, and the bullet hole is deformed;

[0027] S1 impact point, 5 meters away, the inner diameter of the bullet hole is about 6mm, the depth is 4mm, it did not penetrate, there is a pinhole at the bottom of the plate, but because the initial velocity of the pistol bullet is small, the process of entering the steel plate is not thorough enough, and the bullet hole is deformed.

[0028] The experiment proved that the bulletproof and explosion-proof coating prepared by this method had no penetration at the impact points S1~S3 and B1~B3, and there were only pinholes at the bottom of the plate, which could meet the bulletproof purpose and achieve the expected effect.

[0029] The above disclosure is only one embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment can be implemented, and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A bulletproof and explosion-proof coating, characterized in that: The components include: The molecular weight of the polyurea resin is adjusted to 30,000-50,000; the curing agent adopts polyester-modified hexamethylene isocyanate, and the linear molecular toughness of polyester is used to improve the mechanical strength of the paint film.

2. The bulletproof and explosion-proof coating according to claim 1, characterized in that The bulletproof filler is one or more of mica powder, talcum powder, feldspar powder and glass fiber powder; the filamentous and flaky structures of the powder are used to disperse mechanical stress, thereby achieving the effect of enhancing the toughness of the paint film.

3. The bulletproof and explosion-proof coating according to claim 2, characterized in that The bulletproof filler is glass fiber powder, natural mineral talcum powder and feldspar powder.

4. The bulletproof and explosion-proof coating according to claim 1, characterized in that Titanium dioxide and phthalocyanine blue are mixed with polyurea resin in a weight ratio of 10:0.

5.

5. A method for preparing a bulletproof and explosion-proof coating, characterized in that The molecular weight of the polyurea resin is adjusted to 30,000-50,000 by using different high molecular weight polymers; 40-50 parts by weight of the polyurea resin after the molecular weight is adjusted, 1-3 parts by weight of a dispersing aid, 1-2 parts by weight of an anti-settling aid, 20-35 parts by weight of a bulletproof filler and 10-20 parts by weight of a coloring pigment are mixed, and stirred at a high speed of 1,000-1,500 r / min for 30-50 minutes, and then 1-3 parts by weight of a defoamer and an anti-sagging aid are added and mixed to form a main agent; the main agent and a curing agent are respectively sent to a nozzle through separate pipelines at high pressure, and are fully mixed in a mixing chamber of the nozzle to form a bulletproof and explosion-proof coating that can be directly sprayed; the curing agent uses polyester-modified hexamethylene isocyanate, and the linear molecular toughness of the polyester is used to improve the mechanical strength of the paint film.

6. The method for preparing the bulletproof and explosion-proof coating according to claim 5, characterized in that The bulletproof filler is one or more of mica powder, talcum powder, feldspar powder and glass fiber powder; the filamentous and flaky structures of the powder are used to disperse mechanical stress, thereby achieving the effect of enhancing the toughness of the paint film.

7. The method for preparing the bulletproof and explosion-proof coating according to claim 6, characterized in that The bulletproof filler is glass fiber powder, natural mineral talcum powder and feldspar powder.

8. The method for preparing the bulletproof and explosion-proof coating according to claim 7, characterized in that Titanium dioxide and phthalocyanine blue are mixed with polyurea resin in a weight ratio of 10:0.5.

Images