CN102850681B - 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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- CN102850681B CN102850681B CN201210355066.3A CN201210355066A CN102850681B CN 102850681 B CN102850681 B CN 102850681B CN 201210355066 A CN201210355066 A CN 201210355066A CN 102850681 B CN102850681 B CN 102850681B
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- gunpowder
- butyl methacrylate
- low temperature
- cladding
- resin powder
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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 a kind of for gunpowder coated low temperature squeezing coating material and preparation method specifically.
Background technology
Coating layer is the more integral part of weight of solid rocket propellant powder charge, its basic role is the burning area of controlling propellant charge, play again the heat-blocking action to motor body, its performance is determining working order and the work-ing life of rocket engine simultaneously.Along with improving constantly of rocketry, multiple macromolecular material is applied to being coated.Common coating technology has dipping to be coated, casting is coated, paster is coated, squeezing is coated etc.Adopt squeezing to be coated the new technology that coated propellant is the coated field of gunpowder, it will be coated at short notice material particle and be heated to viscous state, on thermoplastic plastics shaping machine or other casting machine, under pressure, squeeze coated propellant.Russ P RU2209135 (2003) and U.S. Pat 3642961 have all proposed this method for coating, are characterized in that production efficiency is high, and steady quality, can be coated the powder grain with complex geometric shapes surface.
It is existing that to be applied to the coated thermoplastic covering material category of squeezing few, common report be cellulose acetate sill, its mechanical property, ablation resistance are poor, squeeze temperature higher, generally 150 ~ 190
obetween 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 object of this invention is to provide a kind ofly for the coated low temperature of gunpowder squeezing coating material, this coating material squeezing temperature is low, can be 120
oat the temperature of C left and right, by extruding method, gunpowder is coated, mechanical property and ablation resistance are good, and production method is simple.
Another object of the present invention is to provide 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 for the coated low temperature squeezing coating material of gunpowder, 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, hydridization filler is organic inorganic hybridization core-shell structure particle, and the core 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.
In described butyl methacrylate-styrol copolymer, butyl methacrylate content is 20 ~ 50wt%.
Preparing an above-mentioned method for the coated low temperature squeezing coating material of gunpowder, is 25 ~ 55: 5 ~ 8: 7 ~ 12: 30 ~ 50 by mass percentage: butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent are mixed also extruding pelletization by 3 ~ 5 obtains low temperature squeezing coating material.
Of the present invention for the coated low temperature of gunpowder squeezing 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, at relatively low temperature, there is high flowing property, can be 120
omachine-shaping under the lesser temps of C left and right; (2) adopt organic inorganic hybridization core-shell structure particle as the filler of resistance to ablation, be characterized in that ablation resistance is good, good with body material butyl methacrylate-styrol copolymer consistency, improve the performances such as coating material mechanics.(3) add methyl silicon resin powder and aluminium hydroxide the ablation resistance of material is further protected, there is the features such as smokeless simultaneously, can solve for gunpowder coating material " few cigarette " difficult problem.(4) filler of resistance to ablation Heat stability is good used in the present invention, nontoxic, non-volatile.(5) coating material production technique is simple, and production efficiency is high.
Accompanying drawing explanation
The Electronic Speculum shape appearance figure that accompanying drawing 1 is hydridization filler organic inorganic hybridization core-shell structure particle of the present invention.
Embodiment
Realize the present invention for the coated low temperature squeezing coating material of gunpowder, mix and form by butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent.
Wherein butyl methacrylate-styrol copolymer, containing 20 ~ 50% butyl methacrylate, can adopt conventional polymerization process to produce.Hydridization filler is organic inorganic hybridization core-shell structure particle, and as shown in Figure 1, size is 50 ~ 400nm to its pattern.The core 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 produce by conventional seeded emulsion polymerization.Methyl silicon resin powder size is 50 ~ 200nm, can produce by 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.
Of the present invention as follows for the coated low temperature squeezing coating material preparation method of gunpowder: to be 25 ~ 55: 5 ~ 8: 7 ~ 12: 30 ~ 50 by mass percentage: butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent are mixed also extruding pelletization by 3 ~ 5 obtains low temperature squeezing coating material.Below in conjunction with embodiment, the present invention is further described.
Embodiment 1: take 75 grams of butyl methacrylate-styrol copolymer pellets, 24 grams, methyl silicon resin powder, 36 grams, aluminium hydroxide (commercially available), 150 grams of hydridization fillers, 15 grams of dibutyl phthalates.By good above-mentioned powder-granule material combination treatment in high-speed mixer, at feed rate 1kg/min, 115 ℃, extrusion temperature Wei Yi district, 120 ℃, 2nd district, 125 ℃, 3rd district, 125 ℃, 4th district, 110 ℃ of five district's 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extruding, cooling, pelletizing, make the present invention for the coated low temperature squeezing coating material of gunpowder.Tensile strength 4.5MPa, elongation at break 80%, flow temperature 126
oc, linear ablation rate 0.1410mm/s.
Embodiment 2: take 105 grams of butyl methacrylate-styrol copolymer pellets, 18 grams, methyl silicon resin powder, 30 grams, aluminium hydroxide, 135 grams of hydridization fillers, 12 grams of dibutyl phthalates.By good above-mentioned powder-granule material combination treatment in high-speed mixer, at feed rate 1kg/min, 115 ℃, extrusion temperature Wei Yi district, 120 ℃, 2nd district, 125 ℃, 3rd district, 125 ℃, 4th district, 110 ℃ of five district's 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extruding, cooling, pelletizing, make the present invention for the coated low temperature squeezing coating material of gunpowder.Tensile strength 3.9MPa, elongation at break 142%, flow temperature 120
oc, linear ablation rate 0.2521mm/s.
Embodiment 3: take 117 grams of butyl methacrylate-styrol copolymer pellets, 18 grams, methyl silicon resin powder, 33 grams, aluminium hydroxide, 120 grams of hydridization fillers, 12 grams of dibutyl phthalates.By good above-mentioned powder-granule material combination treatment in high-speed mixer, at feed rate 1kg/min, 115 ℃, extrusion temperature Wei Yi district, 120 ℃, 2nd district, 125 ℃, 3rd district, 125 ℃, 4th district, 110 ℃ of five district's 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extruding, cooling, pelletizing, make the present invention for the coated low temperature squeezing coating material of gunpowder.Tensile strength 3.7MPa, elongation at break 185%, flow temperature 120
oc, linear ablation rate 0.2783mm/s.
Embodiment 4: take 165 grams of butyl methacrylate-styrol copolymer pellets, 15 grams, methyl silicon resin powder, 21 grams, aluminium hydroxide, 90 grams of hydridization fillers, 9 grams of dibutyl phthalates.By good above-mentioned powder-granule material combination treatment in high-speed mixer, at feed rate 1kg/min, 115 ℃, extrusion temperature Wei Yi district, 120 ℃, 2nd district, 125 ℃, 3rd district, 125 ℃, 4th district, 110 ℃ of five district's 128 ℃, mouthful moulds, under the condition of screw speed 50r/min, add twin screw extruder, through extruding, cooling, pelletizing, make the present invention for the coated low temperature squeezing coating material of gunpowder.Tensile strength 3.0MPa, elongation at break 210%, flow temperature 116
oc, linear ablation rate 0.3591mm/s.
Claims (2)
1. one kind squeezes coating material for the coated low temperature of gunpowder, 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 hydridization filler is organic inorganic hybridization core-shell structure particle; The core of organic inorganic hybridization core-shell structure particle is organosilane monomer (CH
3)
nsi (OCH
3)
4-nand Si (OEt)
4the reaction product of combination, n=1,2,3; Shell is butyl methacrylate and methacrylic acid glycol ester polymerization crosslinking product; Softening agent is dibutyl phthalate; In butyl methacrylate-styrol copolymer, butyl methacrylate content is 20 ~ 50wt%; The size of hydridization filler is 50 ~ 400nm; Described methyl silicon resin powder size is 50 ~ 200nm; Described aluminium hydroxide size is 1 ~ 5 μ m.
2. for a preparation method for the coated low temperature squeezing coating material of gunpowder, it is characterized in that described method is 25 ~ 55: 5 ~ 8: 7 ~ 12: 30 ~ 50 by mass percentage: butyl methacrylate-styrol copolymer particle, methyl silicon resin powder, aluminium hydroxide, hydridization filler and softening agent are mixed also extruding pelletization by 3 ~ 5 obtains the low temperature squeezing coating material coated for gunpowder; Wherein, the core of described organic inorganic hybridization core-shell structure particle is organosilane monomer (CH
3)
nsi (OCH
3)
4-nand Si (OEt)
4the reaction product of combination, n=1,2,3; Shell is butyl methacrylate and methacrylic acid glycol ester polymerization crosslinking product; Softening agent is dibutyl phthalate; In butyl methacrylate-styrol copolymer, butyl methacrylate content is 20 ~ 50wt%; The size of 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN102850681A CN102850681A (en) | 2013-01-02 |
| CN102850681B true CN102850681B (en) | 2014-07-02 |
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| 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 |
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 |
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| 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 |
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