SiC fiber reinforced polyurethane series skid-resistant coating and preparation method thereof

[0060] Reference Example 1

[0061] Preparation of SiC short fibers:

[0062] The SiC fibers were added to the high-speed crusher, crushed at a rotational speed of 40,000 r/min for 9 s, and screened for 4 times with a sieve to obtain SiC short fibers with a length of 2 mm.

[0063] Example 1

[0064] SiC fiber reinforced polyurethane-based anti-skid coating:

[0065] It is prepared by mixing components A, B, C and other components, wherein, the mass content of component B is 3.9% of component C, and the other components are mixed with components B and C, and denoted as component D, Component A and component D are mixed in a mass ratio of 1:1.1, and the details of each component are as follows:

[0066] Component A:

[0067] Polytetrahydrofuran ether glycol: 15 parts;

[0068] Carbodiimide-uretonimine modified 4,4 _ Diphenylmethane diisocyanate: 15 parts;

[0069] E44 type epoxy resin: 2 parts;

[0070] Component B:

[0071] SiC short fibers: 6 parts;

[0072] Al 2 O 3 : 15 servings;

[0073] Surface modifier (silane coupling agent KH570): 1 part;

[0074] Component C:

[0075] Carbodiimide-uretonimine modified 4,4 _ Diphenylmethane diisocyanate: 15 parts;

[0076] Chain extender (1,4-butanediol): 1.9 parts;

[0077] BaSO 4 : 2.5 servings;

[0078] Titanium dioxide: 4 parts;

[0079] Talc: 2 parts;

[0080] Other components:

[0081] Diluent (3:2 mixture of butyl acetate:xylene): 12 parts;

[0082] Defoamer (BYK-066N): 0.5 part;

[0083] Leveling agent (BYK-330): 0.3 parts;

[0084] Wherein, the molecular weight of the polytetrahydrofuran ether glycol is 1000; the short SiC fibers are SiC fibers with a length of 2 mm.

[0085] Preparation method of fiber-reinforced polyurethane-based anti-skid coating:

[0086] (1) Add 15 parts of polytetrahydrofuran ether diol (molecular weight 1000) into the three-necked flask, stir at a speed of 500r/min, heat up to 120°C, dehydrate under -0.1MPa under vacuum for 2h, and then cool down to 60°C , and then add 15 parts of carbodiimide-uretonimine modified 4,4 _ Diphenylmethane diisocyanate, introduced nitrogen as protective gas, heated to 80 °C, reacted for 2 h, when the mass fraction of free isocyanate reached 11%, cooled to 60 °C, added 2 parts of E44 epoxy resin, stirred Reaction for 1h to when the mass fraction of free isocyanate reaches 7%, vacuum defoaming for 0.5h until no air bubbles, discharge and seal preservation to obtain a polyurethane prepolymer, denoted as component A;

[0087] (2) Combine 6 parts of SiC short fibers (2mm in length) with 15 parts of Al 2 O 3 The granules (60 mesh size) were mixed, dried under vacuum at 100 °C for 24 hours, then dispersed in ethanol solution, added with glacial acetic acid to adjust the pH to 4, and added 1 part of surface modifier (which was formulated into a 2.5% mass concentration The solution was ultrasonically dispersed at 20 kHz for 20 min, transferred to a three-necked flask, heated at 70 °C, stirred for 1 h, vacuum filtered, washed with ethanol for 3 times, and dried at 70 °C for 1 h to obtain a composite modified by the surface modifier. Anti-slip agent, denoted as component B; the SiC short fibers are SiC fibers;

[0088] (3) 15 parts of carbodiimide-uretonimine modified 4,4 _ Diphenylmethane diisocyanate, 1.9 parts chain extender, 2.5 parts BaSO 4 , 4 parts of titanium dioxide and 2 parts of talcum powder were mixed, and recorded as component C. After ball milling and dispersing for 4 hours, the material was discharged and the component B equivalent to 3.9% of the mass of component C was added, and stirred and dispersed in 12 parts of diluent for 30 minutes. , add 0.5 parts of defoaming agent, 0.3 parts of leveling agent, ball mill and disperse for 4 hours and then discharge to obtain a solidified component, which is recorded as component D;

[0089] (4) Component A and component D are ball-milled for 2 hours at a mass ratio of 1:1.1 until uniform, to obtain a SiC fiber-reinforced polyurethane-based anti-skid coating.

[0090] The SiC fiber reinforced polyurethane-based anti-skid coating was brushed on each test sample after cleaning with anhydrous ethanol, and cured to form a film at room temperature. At the same time, the drying time of the paint film was measured, and the paint film was cured and dried completely. A series of performance tests and studies of the paint film, the performance test of the paint film was carried out again at 0 °C, and the specific results are shown in Table 1.

[0091] Table 1 Comprehensive performance test results of the SiC fiber-reinforced polyurethane-based anti-skid coating obtained in Example 1

[0092]

[0093] It can be seen from Table 1 that after curing and drying, the SiC fibers and Al 2 O 3 The particles are randomly distributed inside and on the surface of the paint film, the appearance of the paint film is uniform and stable, and there are almost no surface defects; the paint film can achieve rapid curing at room temperature, the surface drying time is less than or equal to 1h, and the actual drying time is less than or equal to 13h; the mass fraction of non-volatile matter in the deck anti-skid coating Up to 74.1%, much higher than 50% of the standard requirement; flexibility ≤1.5mm; adhesion 6.38MPa, better than the standard requirement ≥5MPa, with excellent mechanical properties; excellent wear resistance, its wear amount is only 1.1mg The coefficient of friction is 0.86 in dry state, 0.73 in wet state, and 0.69 in oil state, and has excellent anti-skid performance; after soaking the paint film sample in standard salt water test solution for 7 days, the paint film does not appear discoloration, blistering and falling off. Excellent anti-corrosion properties. It is cured to form a film at 0 °C. After curing and drying, although the friction coefficient of the paint film is reduced, there is no sudden drop, and the friction coefficient can still meet the technical requirements (μ≥0.6) after the reduction. Under hardening, the hardness of the paint film increases, resulting in improved wear resistance.

[0094] Example 2

[0095] SiC fiber reinforced polyurethane-based anti-skid coating:

[0096] It is prepared by mixing components A, B, C and other components, wherein, the mass content of component B is 4.6% of component C, and the other components are mixed with components B and C, and denoted as component D, Component A and component D are mixed in a mass ratio of 1:1.1, and the details of each component are as follows:

[0097] Component A:

[0098] Polytetrahydrofuran ether glycol: 13 parts;

[0099] Carbodiimide-uretonimine modified 4,4 _ Diphenylmethane diisocyanate: 13 parts;

[0100] E44 type epoxy resin: 1.5 parts;

[0101] Component B:

[0102] SiC short fibers: 3 parts;

[0103] Al 2 O 3 : 13 servings;

[0104] Surface modifier (silane coupling agent KH570): 1 part;

[0105] Component C:

[0106] Carbodiimide-uretonimine modified 4,4 _ Diphenylmethane diisocyanate: 13 parts;

[0107] Chain extender (1,4-butanediol): 1.9 parts;

[0108] BaSO 4 : 2 servings;

[0109] Titanium dioxide: 3 parts;

[0110] Talc: 2 parts;

[0111] Other components:

[0112] Diluent (3:2 mixture of butyl acetate:xylene): 10 parts;

[0113] Defoamer (BYK-066N): 0.5 part;

[0114] Leveling agent (BYK-330): 0.3 parts;

[0115] Wherein, the molecular weight of the polytetrahydrofuran ether glycol is 1000; the short SiC fibers are SiC fibers with a length of 2 mm.

[0116] Preparation method of fiber-reinforced polyurethane-based anti-skid coating:

[0117] (1) Add 13 parts of polytetrahydrofuran ether diol (molecular weight 1000) into the three-necked flask, stir at a speed of 500r/min, heat up to 115°C, vacuum and dehydrate at -0.1MPa for 2 hours, and then cool down to 55°C , and then add 13 parts of carbodiimide-uretonimine modified 4,4 _ Diphenylmethane diisocyanate, introduced nitrogen as protective gas, heated to 75°C, reacted for 2h, when the mass fraction of free isocyanate reached 12%, cooled to 55°C, added 1.5 parts of E44 epoxy resin, stirred Reaction for 1h to when the free isocyanate content reaches 8%, vacuum defoaming for 0.5h until no bubbles, discharging and sealing to obtain a polyurethane prepolymer, which is recorded as component A;

[0118] (2) Combine 3 parts of SiC short fibers (2mm in length) with 13 parts of Al 2 O 3 The pellets (60 mesh size) were mixed, dried under vacuum at 100°C for 26 hours, then dispersed in ethanol solution, added with glacial acetic acid to adjust the pH to 4, and added with 1 part of surface modifier (which was formulated into a mass concentration of 2.5%). The solution was ultrasonically dispersed at 20kHZ for 20min, transferred to a three-necked flask, heated at 70°C, stirred and reacted for 1h, vacuum filtered, washed with ethanol for 3 times, and dried at 70°C for 1h to obtain a composite modified by the surface modifier. Anti-slip agent, denoted as component B; the SiC short fibers are SiC fibers;

[0119] (3) Modified 13 parts of carbodiimide-uretonimine 4,4 _ Diphenylmethane diisocyanate, 1.9 parts chain extender, 2 parts BaSO 4 , 3 parts of titanium dioxide and 2 parts of talcum powder were mixed, and recorded as component C. After ball milling and dispersing for 4 hours, the material was discharged and the component B equivalent to 4.6% of the mass of component C was added, and stirred and dispersed in 10 parts of diluent for 30 minutes. , add 0.5 parts of defoaming agent, 0.3 parts of leveling agent, ball mill and disperse for 4 hours and then discharge to obtain a solidified component, which is recorded as component D;

[0120] (4) Component A and component D are ball-milled for 2 hours at a mass ratio of 1:1.1 until uniform, to obtain a SiC fiber-reinforced polyurethane-based anti-skid coating.

[0121] The SiC fiber reinforced polyurethane-based anti-skid coating was brushed on each test sample after cleaning with anhydrous ethanol, and cured to form a film at room temperature. At the same time, the drying time of the paint film was measured, and the paint film was cured and dried completely. A series of performance tests and studies of the paint film, the performance test of the paint film was carried out again at 0 °C, and the specific results are shown in Table 2.

[0122] Table 2 Comprehensive performance test results of the SiC fiber-reinforced polyurethane-based anti-skid coating obtained in Example 2

[0123]

[0124] It can be seen from Table 2 that after curing and drying, the SiC fibers and Al 2 O 3 The particles are randomly distributed inside and on the surface of the paint film, the appearance of the paint film is uniform and stable, and there are almost no surface defects; the paint film can achieve rapid curing at room temperature, the surface drying time is less than or equal to 1h, and the actual drying time is less than or equal to 13h; the mass fraction of non-volatile matter in the deck anti-skid coating Up to 70.7%, much higher than 50% of the standard requirement; flexibility ≤1.5mm; adhesion 5.53MPa, better than the standard requirement ≥5MPa, with excellent mechanical properties; excellent wear resistance, its wear amount is only 6.95mg The coefficient of friction is 0.83 in dry state, 0.70 in wet state, and 0.68 in oil state, and has excellent anti-skid performance; after soaking the paint film sample in standard salt water test solution for 7 days, the paint film does not appear discoloration, blistering and falling off. Excellent anti-corrosion properties. It is cured to form a film at 0 °C. After curing and drying, although the friction coefficient of the paint film is reduced, there is no sudden drop, and the friction coefficient can still meet the technical requirements (μ≥0.6) after the reduction. Under hardening, the hardness of the paint film increases, resulting in improved wear resistance.