CN102850681A - Low temperature squeeze cladding material used for gunpowder cladding and preparation method - Google Patents
Low temperature squeeze cladding material used for gunpowder cladding and preparation method Download PDFInfo
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- CN102850681A CN102850681A CN2012103550663A CN201210355066A CN102850681A CN 102850681 A CN102850681 A CN 102850681A CN 2012103550663 A CN2012103550663 A CN 2012103550663A CN 201210355066 A CN201210355066 A CN 201210355066A CN 102850681 A CN102850681 A CN 102850681A
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- gunpowder
- low temperature
- coating material
- butyl methacrylate
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Abstract
The invention discloses a low temperature squeeze cladding material used for gunpowder cladding and a preparation method. The low temperature squeeze cladding material used for gunpowder cladding is prepared by: subjecting a butyl methacrylate-styrene copolymer particle, methyl silicon resin powder, aluminum hydroxide, a hybrid filling material and a plasticizer that are in a mass percentage of 25-55:5-8:7-12:30-50:3-5 to high-speed mixing and extrusion pelletizing. The hybrid filling material is an organic-inorganic hybrid core-shell structured particle. The low temperature squeeze cladding material used for gunpowder cladding disclosed in the invention can be used to clad gunpowder by means of squeeze molding at a low temperature, and has good ablation resistance and mechanical performance. The production process is simple, and the production efficiency is high.
Description
Technical field
The present invention relates to gunpowder coating material technical field, is that a kind of low temperature that coats for gunpowder squeezes coating material and preparation method specifically.
Background technology
Coating layer is the weight integral part more of solid rocket propellant powder charge, its basic role is the burning area of control propellant charge, play again simultaneously the heat-blocking action to motor body, its performance is determining working order and the work-ing life of rocket engine.Along with improving constantly of rocketry, multiple macromolecular material is applied to coating.Common coating technology has dipping to coat, casting coats, paster coats, squeezing coats etc.Adopting squeezing to coat coated propellant is the new technology that gunpowder coats the field, and it will coat at short notice the material particle and be heated to viscous state, squeeze coated propellant on thermoplastic plastics shaping machine or other casting machine under pressure.Russ P RU2209135 (2003) and US Patent No. 3642961 have all proposed this method for coating, are characterized in that production efficiency is high, and steady quality can coat the powder grain with complex geometric shapes surface.
The existing thermoplastic covering material category that is applied to squeeze coating is few, common report be the cellulose acetate sill, its mechanical property, ablation resistance are poor, squeeze temperature higher, generally 150 ~ 190
oBetween the C, need very large pressure, easily cause part priming paint to be flushed away, cause scrapping of powder charge, cause heavy economic losses.
Summary of the invention
The purpose of this invention is to provide a kind of low temperature that coats for gunpowder and squeeze coating material, this coating material squeezing temperature is low, can be 120
oUnder the temperature about C, by the extruding method gunpowder is coated, mechanical property and ablation resistance are good, and production method is simple.
Another object of the present invention provides a kind of preparation method of above-mentioned gunpowder coating material.
The technical solution that realizes the object of the invention is: a kind of low temperature that coats for gunpowder squeezes coating material, be 25 ~ 55: 5 ~ 8 by mass percent: 7 ~ 12: 30 ~ 50: 3 ~ 5 butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent mix and form, the hydridization filler is the organic inorganic hybridization core-shell structure particle, and the nuclear of organic inorganic hybridization core-shell structure particle is organosilane monomer (CH
3)
nSi (OCH
3)
4-n(n=1,2,3) and Si (OEt)
4The reaction product of combination, shell is butyl methacrylate and methacrylic acid glycol ester polymerization crosslinking product; Softening agent is dibutyl phthalate.
Butyl methacrylate content is 20 ~ 50wt% in described butyl methacrylate-styrol copolymer.
A kind of method for preparing the above-mentioned low temperature squeezing coating material that coats for gunpowder is 25 ~ 55: 5 ~ 8: 7 ~ 12: 30 ~ 50 by mass percentage: 3 ~ 5 mix butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent and extruding pelletization obtains low temperature squeezing coating material.
The low temperature that coats for gunpowder of the present invention squeezes coating material compared with prior art, its remarkable advantage is: (1) body material adopts butyl methacrylate-styrol copolymer, this multipolymer combines the advantage of poly-n-butyl methacrylate and polystyrene, mechanical property is good, flow temperature is low, high flowing property is arranged under relatively low temperature, can be 120
oMachine-shaping under the lesser temps about C; (2) adopt the organic inorganic hybridization core-shell structure particle as the filler of anti-the ablation, be characterized in that ablation resistance is good, good with body material butyl methacrylate-styrol copolymer consistency, improved the performances such as coating material mechanics.(3) add methyl silicon resin powder and aluminium hydroxide the ablation resistance of material further is protected, have simultaneously the characteristics such as smokeless, can solve for the gunpowder coating material " few cigarette " difficult problem.(4) filler of anti-ablation Heat stability is good used in the present invention, nontoxic, non-volatile.(5) the coating material production technique is simple, and production efficiency is high.
Description of drawings
Accompanying drawing 1 is the Electronic Speculum shape appearance figure of hydridization filler organic inorganic hybridization core-shell structure particle of the present invention.
Embodiment
Realize that the present invention is used for the low temperature squeezing coating material that gunpowder coats, mixed by butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent to form.
Wherein butyl methacrylate-styrol copolymer contains 20 ~ 50% butyl methacrylate, can adopt conventional polymerization process production.The hydridization filler is the organic inorganic hybridization core-shell structure particle, its pattern as shown in Figure 1, size is 50 ~ 400nm.The nuclear of organic inorganic hybridization core-shell structure particle is organosilane monomer (CH
3)
nSi (OCH
3)
4-n(n=1,2,3) and Si (OEt)
4The reaction product of combination, shell is butyl methacrylate and methacrylic acid glycol ester polymerization crosslinking product, can be by conventional seeded emulsion polymerization production.Methyl silicon resin powder size is 50 ~ 200nm, can produce by the conventional emulsions polycondensation; Aluminium hydroxide size 1 ~ 5 μ m, modification is carried out with silane coupling agent in its surface, and modification processing method is routine techniques in the art.
The low temperature squeezing coating material preparation method who coats for gunpowder of the present invention is as follows: be 25 ~ 55: 5 ~ 8: 7 ~ 12: 30 ~ 50 by mass percentage: 3 ~ 5 mix butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent also, and extruding pelletization obtains low temperature squeezing coating material.Below in conjunction with embodiment the present invention is further specified.
Embodiment 1: take by weighing butyl methacrylate-styrol copolymer pellet 75 grams, methyl silicon resin powder 24 grams, aluminium hydroxide (commercially available) 36 grams, hydridization filler 150 grams, dibutyl phthalate 15 grams.Above-mentioned powder-granule material combination treatment in high-speed mixer is good, at feed rate 1kg/min, extrusion temperature is 115 ℃ in a district, 120 ℃ in two districts, 125 ℃ in three districts, 125 ℃ in four districts, 110 ℃ of five districts, 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extrude, cooling, pelletizing, make the present invention and be used for the low temperature squeezing coating material that gunpowder coats.Tensile strength 4.5MPa, elongation at break 80%, flow temperature 126
oC, linear ablation rate 0.1410mm/s.
Embodiment 2: take by weighing butyl methacrylate-styrol copolymer pellet 105 grams, methyl silicon resin powder 18 grams, aluminium hydroxide 30 grams, hydridization filler 135 grams, dibutyl phthalate 12 grams.Above-mentioned powder-granule material combination treatment in high-speed mixer is good, at feed rate 1kg/min, extrusion temperature is 115 ℃ in a district, 120 ℃ in two districts, 125 ℃ in three districts, 125 ℃ in four districts, 110 ℃ of five districts, 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extrude, cooling, pelletizing, make the present invention and be used for the low temperature squeezing coating material that gunpowder coats.Tensile strength 3.9MPa, elongation at break 142%, flow temperature 120
oC, linear ablation rate 0.2521mm/s.
Embodiment 3: take by weighing butyl methacrylate-styrol copolymer pellet 117 grams, methyl silicon resin powder 18 grams, aluminium hydroxide 33 grams, hydridization filler 120 grams, dibutyl phthalate 12 grams.Above-mentioned powder-granule material combination treatment in high-speed mixer is good, at feed rate 1kg/min, extrusion temperature is 115 ℃ in a district, 120 ℃ in two districts, 125 ℃ in three districts, 125 ℃ in four districts, 110 ℃ of five districts, 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extrude, cooling, pelletizing, make the present invention and be used for the low temperature squeezing coating material that gunpowder coats.Tensile strength 3.7MPa, elongation at break 185%, flow temperature 120
oC, linear ablation rate 0.2783mm/s.
Embodiment 4: take by weighing butyl methacrylate-styrol copolymer pellet 165 grams, methyl silicon resin powder 15 grams, aluminium hydroxide 21 grams, hydridization filler 90 grams, dibutyl phthalate 9 grams.Above-mentioned powder-granule material combination treatment in high-speed mixer is good, at feed rate 1kg/min, extrusion temperature is 115 ℃ in a district, 120 ℃ in two districts, 125 ℃ in three districts, 125 ℃ in four districts, 110 ℃ of five districts, 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extrude, cooling, pelletizing, make the present invention and be used for the low temperature squeezing coating material that gunpowder coats.Tensile strength 3.0MPa, elongation at break 210%, flow temperature 116
oC, linear ablation rate 0.3591mm/s.
Claims (8)
1. one kind is used for the low temperature squeezing coating material that gunpowder coats, it is characterized in that described material is 25 ~ 55: 5 ~ 8 by mass percent: 7 ~ 12: 30 ~ 50: 3 ~ 5 butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent mix and form, and wherein the hydridization filler is the organic inorganic hybridization core-shell structure particle.
2. the low temperature that coats for gunpowder according to claim 1 squeezes coating material, and the nuclear that it is characterized in that described organic inorganic hybridization core-shell structure particle is organosilane monomer (CH
3)
nSi (OCH
3)
4-n(n=1,2,3) and Si (OEt)
4The reaction product of combination, shell is butyl methacrylate and methacrylic acid glycol ester polymerization crosslinking product; Softening agent is dibutyl phthalate.
3. the low temperature that coats for gunpowder according to claim 1 squeezes coating material, it is characterized in that butyl methacrylate content is 20 ~ 50wt% in described butyl methacrylate-styrol copolymer.
4. the low temperature that coats for gunpowder according to claim 1 squeezes coating material, and the size that it is characterized in that described hydridization filler is 50 ~ 400nm; Described methyl silicon resin powder size is 50 ~ 200nm; Described aluminium hydroxide size is 1 ~ 5 μ m.
5. preparation method who is used for the low temperature squeezing coating material that gunpowder coats is characterized in that described method is 25 ~ 55: 5 ~ 8: 7 ~ 12: 30 ~ 50 by mass percentage: 3 ~ 5 mix butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent and extruding pelletization obtains the low temperature squeezing coating material that coats for gunpowder.
6. the low temperature for the gunpowder coating according to claim 5 squeezes the preparation method of coating material, and the nuclear that it is characterized in that described organic inorganic hybridization core-shell structure particle is organosilane monomer (CH
3)
nSi (OCH
3)
4-n(n=1,2,3) and Si (OEt)
4The reaction product of combination, shell is butyl methacrylate and methacrylic acid glycol ester polymerization crosslinking product; Softening agent is dibutyl phthalate.
7. the low temperature for the gunpowder coating according to claim 5 squeezes the preparation method of coating material, it is characterized in that butyl methacrylate content is 20 ~ 50wt% in described butyl methacrylate-styrol copolymer.
8. the low temperature for the gunpowder coating according to claim 5 squeezes the preparation method of coating material, and the size that it is characterized in that described hydridization filler is 50 ~ 400nm; Described methyl silicon resin powder size is 50 ~ 200nm; Described aluminium hydroxide size 1 ~ 5 μ m.
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| CN201210355066.3A CN102850681B (en) | 2012-09-22 | 2012-09-22 | Low temperature squeeze cladding material used for gunpowder cladding and preparation method |
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| CN201210355066.3A CN102850681B (en) | 2012-09-22 | 2012-09-22 | Low temperature squeeze cladding material used for gunpowder cladding and preparation method |
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| CN102850681B CN102850681B (en) | 2014-07-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112391002A (en) * | 2019-08-16 | 2021-02-23 | 南京理工大学 | Heat-shrinkable coating layer for solid propellant and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1537906A (en) * | 2003-10-22 | 2004-10-20 | 深圳丹邦科技有限公司 | Siliconless fire-retardant type quick solidifying covering film for flexible circuit and its preparation method |
-
2012
- 2012-09-22 CN CN201210355066.3A patent/CN102850681B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1537906A (en) * | 2003-10-22 | 2004-10-20 | 深圳丹邦科技有限公司 | Siliconless fire-retardant type quick solidifying covering film for flexible circuit and its preparation method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112391002A (en) * | 2019-08-16 | 2021-02-23 | 南京理工大学 | Heat-shrinkable coating layer for solid propellant and preparation method thereof |
| CN112391002B (en) * | 2019-08-16 | 2022-05-27 | 南京理工大学 | Heat-shrinkable coating layer for solid propellant and preparation method thereof |
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| CN102850681B (en) | 2014-07-02 |
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