Lightweight composite material for fireproof safety box and preparation method of lightweight composite material

Abstract

The invention relates to a light composite material for a fireproof safety box and a preparation method thereof, and the light composite material is prepared by mixing and solidifying the following components in parts by weight: 100 parts of cement; 20 to 36 parts of calcium hydroxide; 18 to 28 parts of expanded vermiculite; 3-5 parts of flame-retardant foamed polyphenyl particles; 2.7 to 4.0 parts of water glass; 0.3 to 0.8 part of a polycarboxylic acid water reducing agent; 0.3 to 0.7 part of an antirust agent; 10-25 parts of fire-resistant reinforced fibers; and 65-84 parts of water. Compared with the prior art, the light composite material for the fireproof safety box and the preparation method thereof have the advantages that on the premise of ensuring the heat insulation performance, the specific gravity of a mixed material is greatly reduced, the service life of a product is greatly prolonged, the quality of the product is greatly improved, and the anti-theft performance is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of safes, and in particular to a lightweight composite material for fireproof safes and a preparation method thereof. Background Art

[0002] As a container for storing cash, bills, confidential documents or other valuables, safes are generally made of metal materials and have good anti-theft performance. However, metal materials are good conductors of heat and have strong thermal conductivity. In the event of a fire, safes do not have a fireproof function.

[0003] The fire protection of traditional safes in my country is achieved by using rock wool, asbestos or aluminum silicate fiber wool as interlayer materials. The fire protection level is not high and can only meet the fire protection requirements of 1 / 2 hour and fire resistance below 760℃. According to the requirements of the national standard or standard: the outside temperature is 927℃, and the temperature inside the cabinet should not exceed 177℃ after burning for 1 hour. In order to meet the requirements of high-grade fireproof safes (boxes), foamed cement and concrete with fireproof and heat-insulating materials are generally used. The biggest disadvantages are: 1) The interlayer materials used in safes (boxes) have a high specific gravity, about 1200kg / m3~1500kg / m3, and the overall weight of the safe is heavy, which increases the logistics cost and is not easy to install and use; 2) Safes (boxes) are mostly supported by steel, and the foamed cement or concrete filled in the middle will cause rust at the joints of the steel plates, affecting the service life and user experience of the product. These are two urgent problems to be solved in the manufacture of high-grade fireproof safes (boxes). Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a lightweight composite material for a fireproof safe and a preparation method thereof in view of the deficiencies of the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The invention discloses a lightweight composite material for a fireproof safe. The composite material is prepared by mixing and solidifying cement, calcium hydroxide, expanded vermiculite, flame retardant foamed polystyrene particles, water glass, polycarboxylic acid water reducer, rust preventer, fire-resistant reinforcing fiber and water. The composition by weight is as follows: 100 parts of cement; 20-36 parts of calcium hydroxide; 18-28 parts of expanded vermiculite; 3-5 parts of flame retardant foamed polystyrene particles; 2.7-4.0 parts of water glass; 0.3-0.8 parts of polycarboxylic acid water reducer; 0.3-0.7 parts of rust preventer; 10-25 parts of fire-resistant reinforcing fiber; and 65-84 parts of water.

[0007] Furthermore, the cement is silicate cement or ordinary silicate cement.

[0008] Furthermore, the fineness of the calcium hydroxide is 300 mesh or above.

[0009] Furthermore, the particle size of the expanded vermiculite particles is 3 to 6 mm, and the bulk density is 80 to 120 kg / m3.

[0010] Furthermore, the particle size of the flame retardant expanded polystyrene particles is 1 to 3 mm, and the bulk density is 10 to 15 kg / m3.

[0011] Furthermore, the water glass has a Baume degree of 39 or above and is alkaline.

[0012] Furthermore, the rust inhibitor is monoethanolamine, and the pH value is 12 or above.

[0013] Furthermore, the fire-resistant reinforcing fiber is basalt fiber or alkali-free chopped fiber.

[0014] A method for preparing a lightweight composite material for a fireproof safe comprises the following steps: step 1: weighing cement, calcium hydroxide, expanded vermiculite, polycarboxylic acid water reducer and fire-resistant reinforcing fiber according to a mixing ratio, putting them into a mixer, and dry-mixing for 2-3 minutes to make them evenly mixed; step 2: weighing water and rust inhibitor according to a mixing ratio, mixing them evenly, adding them to the evenly mixed mixture obtained in step 1, and continuing to stir; step 3: after step 2 is completely added, continue stirring for 3-5 minutes, then stop stirring, and then slowly add water glass; step 4: finally adding flame-retardant foamed polystyrene particles, mixing evenly, and thus obtaining a lightweight composite material for a fireproof safe.

[0015] Compared with the prior art, the lightweight composite material for fireproof safe and the preparation method thereof of the present invention have the following beneficial effects:

[0016] 1. By using flame-retardant foamed polystyrene particles, the specific gravity of the mixed material is greatly reduced to 420-490kg / m3 while ensuring the thermal insulation performance. Compared with traditional foamed cement and thermal insulation concrete, the specific gravity is reduced by about 40%-50%; 2. By adding monoethanolamine to the mixed material, the pH value of the mixed material is increased, a passivation film will be formed at the joints of the steel plates, and there will be no rust at the joints of the steel plates, which greatly improves the product life and product quality;

[0017] 3. The use of fire-resistant reinforcing fibers increases the compression and impact resistance of fireproof and heat-insulating materials and enhances anti-theft performance;

[0018] 4. The use of flame-retardant aggregate, water glass / water dual gelling technology and fiber reinforcement scheme avoids the shrinkage of (non-flame-retardant) expanded polystyrene particles at high temperatures to produce penetrating gaps, which in turn causes heat to be transmitted into the safe. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below.

[0020] Embodiment 1

[0021] The composition includes 100 parts of cement, 20 parts of calcium hydroxide, 18 parts of expanded vermiculite, 3 parts of flame-retardant foamed polystyrene particles, 2.7 parts of water glass, 0.3 parts of polycarboxylic acid water reducer, 0.3 parts of rust inhibitor, 10 parts of fire-resistant reinforcing fiber and 65 parts of water.

[0022] The specific preparation method is as follows: cement, calcium hydroxide, expanded vermiculite, polycarboxylic acid water-reducing agent and fire-resistant reinforcing fiber are weighed according to the mixing ratio, put into a mixer, and dry-mixed for 2 to 3 minutes to make them mixed evenly; then water and monoethanolamine are weighed according to the mixing ratio, mixed evenly, added to the mixed material obtained in step one, and continued to stir; after step two is completely added, continue to stir for 3 to 5 minutes, then stop stirring, and then slowly add water glass; finally, add flame-retardant foamed polystyrene particles, mix evenly, and obtain a lightweight composite material for fireproof safes.

[0023] After testing: the density of the filling material is 487kg / m3. After practice, there is no rust at the joints of the plates. The wall thickness of the filling material is 42mm. After the standard fire resistance test, the highest temperature of the internal test point in 1 hour is 150.3℃, which meets the requirements of national or American standard paper safes (<177℃).

[0024] Embodiment 2

[0025] The invention adopts 100 parts of cement, 36 parts of calcium hydroxide, 28 parts of expanded vermiculite, 5 parts of flame-retardant foamed polystyrene particles, 4.0 parts of water glass, 0.8 parts of polycarboxylic acid water reducer, 0.7 parts of rust inhibitor, 25 parts of fire-resistant reinforcing fiber and 84 parts of water.

[0026] The specific preparation method is as follows: cement, calcium hydroxide, expanded vermiculite, polycarboxylic acid water-reducing agent and fire-resistant reinforcing fiber are weighed according to the mixing ratio, put into a mixer, and dry-mixed for 2 to 3 minutes to make them mixed evenly; then water and monoethanolamine are weighed according to the mixing ratio, mixed evenly, added to the mixed material obtained in step one, and continued to stir; after step two is completely added, continue to stir for 3 to 5 minutes, then stop stirring, and then slowly add water glass; finally, add flame-retardant foamed polystyrene particles, mix evenly, and obtain a lightweight composite material for fireproof safes.

[0027] After testing: the density of the filling material is 423kg / m3. After practice, there is no rust at the joints of the plates. The wall thickness of the filling material is 42mm. After the standard fire resistance test, the highest temperature of the internal test point in 1 hour is 162.3℃, which meets the requirements of national or American standard paper safes (<177℃).

[0028] Embodiment 3

[0029] The composition includes 100 parts of cement, 28 parts of calcium hydroxide, 23 parts of expanded vermiculite, 4.2 parts of flame-retardant foamed polystyrene particles, 3.3 parts of water glass, 0.4 parts of polycarboxylic acid water reducer, 0.4 parts of rust inhibitor, 12.6 parts of fire-resistant reinforcing fiber and 70 parts of water.

[0030] The specific preparation method is as follows: cement, calcium hydroxide, expanded vermiculite, polycarboxylic acid water-reducing agent and fire-resistant reinforcing fiber are weighed according to the mixing ratio, put into a mixer, and dry-mixed for 2 to 3 minutes to make them mixed evenly; then water and monoethanolamine are weighed according to the mixing ratio, mixed evenly, added to the mixed material obtained in step one, and continued to stir; after step two is completely added, continue to stir for 3 to 5 minutes, then stop stirring, and then slowly add water glass; finally, add flame-retardant foamed polystyrene particles, mix evenly, and obtain a lightweight composite material for fireproof safes.

[0031] After testing: the density of the filling material is 456kg / m3. After practice, there is no rust at the joints of the plates. The wall thickness of the filling material is 42mm. After the standard fire resistance test, the highest temperature of the internal test point in 1 hour is 148.9℃, which meets the requirements of national or American standard paper safes (<177℃).

[0032] Embodiment 4

[0033] 100 parts of cement; 32 parts of calcium hydroxide; 28 parts of expanded vermiculite; 3 parts of flame retardant foamed polystyrene particles; 4.0 parts of water glass; 0.4 parts of polycarboxylic acid water reducer; 0.3 parts of rust inhibitor; 10 parts of fire-resistant reinforcing fiber; and 80 parts of water.

[0034] The specific preparation method is as follows: cement, calcium hydroxide, expanded vermiculite, polycarboxylic acid water reducer and fire-resistant reinforcing fiber are weighed according to the mixing ratio, put into a mixer, and dry-mixed for 2 to 3 minutes to make them mixed evenly; water and monoethanolamine are weighed according to the mixing ratio, mixed evenly, added to the mixed material obtained in step one, and continued to stir; after step two is completely added, continue to stir for 3 to 5 minutes, then stop stirring, and then slowly add water glass; finally, add flame-retardant foamed polystyrene particles, mix evenly, and obtain a lightweight composite material for fireproof safes.

[0035] After testing: the density of the filling material is 461kg / m3. After practice, there is no rust at the joints of the plates. The wall thickness of the filling material is 42mm. After the standard fire resistance test, the highest temperature of the internal test point in 1 hour is 156.7℃, which meets the requirements of national or American standard paper safes (<177℃).

[0036] In the above-mentioned embodiments 1, 2, 3 and 4, the test standard of the safe is based on GB / T 16810-2006 "Requirements and Test Methods for Fire Resistance of Safes" or UL 72 "Tests for Fire Resistance of Record Protection Equipment".

[0037] The present invention is not limited to the described embodiments. Those skilled in the art may make some modifications or changes without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A lightweight composite material for a fireproof safe, characterized in that: It is prepared by mixing and solidifying cement, calcium hydroxide, expanded vermiculite, flame retardant expanded polystyrene particles, water glass, polycarboxylate water reducer, rust inhibitor, refractory reinforcing fiber and water, and its weight ratio is as follows: 100 parts of cement; 20-36 parts of calcium hydroxide; 18-28 parts of expanded vermiculite; 3-5 parts of flame retardant expanded polystyrene particles; 2.7-4.0 parts of water glass; 0.3-0.8 parts of polycarboxylate water reducer; 0.3-0.7 parts of rust inhibitor; 10-25 parts of fire-resistant reinforcing fiber; 65-84 parts of water.

2. The lightweight composite material for a fireproof safe according to claim 1, characterized in that: The cement is silicate cement or ordinary silicate cement.

3. The lightweight composite material for a fireproof safe according to claim 1, characterized in that: The fineness of the calcium hydroxide is 300 mesh or above.

4. The lightweight composite material for a fireproof safe according to claim 1, characterized in that: The particle size of the expanded vermiculite particles is 3-6 mm, and the bulk density is 80-120 kg / m3.

5. The lightweight composite material for a fireproof safe according to claim 1, characterized in that: The particle size of the flame retardant expanded polystyrene particles is 1 to 3 mm, and the bulk density is 10 to 15 kg / m3.

6. The lightweight composite material for a fireproof safe according to claim 1, characterized in that: The water glass has a Baume degree of 39 or above and is alkaline.

7. The lightweight composite material for a fireproof safe according to claim 1, characterized in that: The rust inhibitor is monoethanolamine, and the pH value is 12 or above.

8. The lightweight composite material for a fireproof safe according to claim 1, characterized in that: The fire-resistant reinforcing fiber is basalt fiber or alkali-free chopped fiber.

9. A method for preparing a lightweight composite material for a fireproof safe according to any one of claims 1 to 8, characterized in that: The following steps are included: Step 1: Weigh cement, calcium hydroxide, expanded vermiculite, polycarboxylate water reducer and refractory reinforcing fiber according to the mixing ratio, put them into a mixer, and dry mix for 2 to 3 minutes to mix them evenly; Step 2: Weigh water and rust inhibitor according to the mixing ratio, mix them evenly, add them to the mixed material obtained in step 1, and continue stirring; Step 3: After step 2 is completely added, continue stirring for 3 to 5 minutes, then stop stirring and slowly add water glass; Step 4: Finally, add the flame-retardant foamed polystyrene particles and mix them evenly to obtain a lightweight composite material for a fireproof safe.