JPS5834439B2 - Method for manufacturing composite solid rocket propellant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a composite solid rocket propellant with strong adhesion between propellants or between propellants and primers.

(Hereinafter referred to as propellant ground tea).

When a solid rocket propellant is incorporated into a rocket engine, it: (1) protects the ground tea from external impacts;

(2) Protect the engine case from high temperatures during combustion.

(3) Regulate the burning area of ground tea.

(4) Absorbs thermal stress generated in ground tea and prevents destruction of ground tea due to thermal stress.

For these purposes, a primer is adhesively interposed between the engine case and the ground tea, or between the engine case with a liner and the ground tea.

This conventional primer is, for example,
According to Publication No. 5, after mixing an uncured thermosetting resin and powdered rubber powder, it is applied in a layered manner to the inner wall of an engine case or a mold, or the outer wall of ground tea, and is then hardened.

According to Japanese Patent Publication No. 49-17964, a secondary primer adhesive is applied to the inner surface of the engine case and cured, and a secondary primer adhesive is applied to the surface of the secondary primer to a semi-cured state. Then, the casting agent in the ground tea composition and a cohesive bonding medium of any shape such as beads, fibers, or cloth are bonded and cured to form single-base, double-base, and composite-modified double-base ground tea. There is a method for producing smokeless gunpowder-based solid ground tea characterized by case bonding.

However, in this conventional primer, although it is a good primer, the adhesion between the primer and ground tea is sometimes weak, and delamination is often observed.

In addition, in the latter case, the bonding medium is applied only to smokeless gunpowder-based solid ground tea, and the shape is also bead-like, fiber-like,
A cloth-like material was used.

The present invention aims to overcome the defects caused by such conventional primers, apply the latter method to composite solid ground tea, and furthermore, to apply it to bonding between different kinds of ground tea such as double-thrust ground tea. This was achieved through repeated research in order to be able to apply it to ground tea and ground tea.
Alternatively, the present invention provides a composite solid rosotto ground tea that has stronger adhesion between the ground tea and the primer and can withstand harsh conditions.

In the method for producing composite solid rocket ground tea, zinc oxide, aluminum oxide, magnesium oxide, titanium oxide, calcium carbonate, basic magnesium carbonate, silicic acid, artificial A method for producing composite solid rocket ground tea characterized by interposing at least one powdered polymer filler selected from the group consisting of silicate, asbestos, clay, mica, boron nitride, and carbon. Involvement, the bonding process between regular ground tea and ground tea,
Alternatively, by adding an extremely simple operation and process of intervening the polymer filler to the adhesive interface during the bonding process between ground tea and the primer, the bonding process between ground tea and ground tea, which has never been seen before, or between ground tea and ground tea can be achieved. We have successfully developed a method to obtain solid ground tea with strong adhesion between primers.

The drawings show an embodiment of the present invention, and Figure A in FIG. On a cured or semi-cured coating surface,
FIG. 3 is a partially enlarged sectional view showing a state in which a polymer filler 3 is attached and wetted.

Figure 0 shows ground tea composition 4 on the surface to which filler 3 is attached in Figure A.
FIG.

Figure 1 is a partially enlarged sectional view showing the filler 3 adhered to and moistened on the surface of the uncured or semi-cured ground tea composition 4a, and Figure 2 is a partially enlarged cross-sectional view showing the filler 3 in figure 2.
FIG. 3 is a partially enlarged sectional view showing a state in which a ground tea composition 4b is further cast on the adhering surface of the .

The primer composition 2 for forming the primer layer in the example shown in Figure A is a commonly used room-temperature curable or thermosetting resin. This is a mixture of fillers selected from fillers for

The resins used in this primer composition 2 include epoxy, polysulfide, polybutadiene, polyurethane, polyester, phenol, polystyrene,
These include liquid resins such as urea, melamine, polyacrylate, and polycarbonate, or rubber-based unsaturated hydrocarbon prepolymers.

The fillers to be mixed in the primer composition 2 include zinc oxide, aluminum oxide, magnesium oxide, titanium oxide, silicon oxide, carbon black, finely divided silicic acid, artificial silicate, calcium carbonate, basic magnesium carbonate, Clay Inorganic fillers such as mica, boron nitride, and silanized glass beads; Commonly used synthetic resins such as phenol, epoxy, polystyrene, polyvinyl chloride, urea, polyester, polyacrylate, polycarbonate, polyamide, melamine, and coumaron indene. Rubber powders such as butadiene, chloroprene, butyl, natural polyurethane, recycled acrylonitrile butadiene, and styrene butadiene are used.

Furthermore, fillers in the primer composition 2 include organic fibers such as cotton, hemp, rayon, acetate, links, pulp, nylon, and polyester, and inorganic fibers such as glass, asbestos, carbon, and boron.
These fibers are used in the form of single fibers, threads, tapes, or cloths.

Further, the primer composition 2 may contain commonly used additives such as a stabilizer, a diluent, a crosslinking accelerator, and a curing catalyst, if necessary.

As described above, this invention is characterized in that a polymer filler 3 is attached to the adhesive interface between ground tea and ground tea or between ground tea and a primer to firmly bond the two. As the filler 3, an inorganic filler among the fillers added to the primer composition 2 is used in powder form.

As mentioned in Q above, the primer composition 2 usually contains a filler mixed therein, but the polymer filler 3 is further adhered to and moistened on the surface to which the primer composition 2 is applied. When the ground tea 4 is poured onto this adhering surface and hardened, the adhesion between the primer 2 and the ground tea 4 becomes stronger.

More preferable results can be obtained when these polymeric fillers 3 are used with activity imparted to their surfaces in order to increase the adhesive effect.

Among these polymer fillers 3, carbon black,
Most favorable results are obtained with the use of rubber fillers such as finely divided silicic acid, artificial silicates, calcium carbonate, basic magnesium carbonate, and clay.

The engine case or mold 1 in which the polymer filler 3 is adhered to the surface of the primer composition 2 to be in a hardened or semi-hardened state is attached to the primer composition 2 prior to casting of the ground tea composition 4. After completely removing the unattached portion of the polymer filler 3, as shown in Figure 1, a composite propellant composition is applied to the adhering surface of the polymer filler 3. Cast 4 and harden.

In this way, when the polymer filler 3 is attached and interposed between the ground tea 4 and the primer 20 and the two are bonded together, they are bonded extremely firmly.

Composite ground tea compositions 4.4a and 4b used in this invention are commonly used ground tea compositions, for example, using a thermosetting resin such as polybutadiene, polyurethane, or polysulfide as a binder, and
For example, ammonium perchlorate, ammonium nitrate, HM
It contains oxidizing agents such as X and RDX, metal powders such as aluminum and magnesium, other resin curing agents, crosslinking agents, curing catalysts, physical property improvers, and stabilizers.

As mentioned above, the C diagram in FIG.
Fig. 2 is a partially enlarged view showing the wet state of the filler 3 in Fig. This is a partially enlarged cross-sectional view showing a state in which a filler 3 is attached and interposed between the ground tea. When the polymer filler 3 is interposed at the adhesive interface between the ground tea 4a and the ground tea 4b in this way, the propellant 4 - Similar to the adhesion with the primer 2, the ground tea 4a and the ground tea 4b are bonded extremely firmly.

As shown in Figures 1 and 2, it is possible to form not only ground tea for double thrust use but also large-sized ground tea by bonding the ground tea between the same type of ground tea using this method. It is.

As described above, this invention applies a polymer filler to the surface corresponding to the adhesive interface of the uncured or semi-cured primer composition 2 or the uncured or semi-cured ground tea composition 4a. 3 is applied to wet the resin or binder forming the primer composition 2 or the ground tea composition 4a.

This polymer filler 3 is attached to form a primer composition 2.
Alternatively, the primer composition 2 and the ground tea composition 4a moistened with the binder of the ground tea composition 4a may be cured, or the ground tea compositions 4, 4a, etc. to be poured next in an uncured or semi-cured state. The primer composition 2 and the ground tea 4, or the ground tea 4a and the ground tea 4b can be cured simultaneously to bond them together.

Further, the polymer filler 3 does not need to be excessively attached to the surface of the primer composition 2 or the surface of the ground tea composition 4a;

The composition of 4b allows for proper dispersion and adhesion.

Example 1 On the inner wall of a steel rocket engine case with a diameter of 140 + m and a length of 1200 mm, a primer composition having the composition shown in Table 1 below was uniformly applied to a thickness of 5 mm, and on this coated surface, the primer composition shown in Table 3 was applied. The polymer filler was uniformly spread and adhered to the engine case, and the engine case was left in a constant temperature room at 60° C. for 16 to 24 hours while gently rotating at a speed of 3/rpm.

After curing of the primer composition, a ground tea composition having the composition shown in Table 2 below was poured into the case, defoamed, and placed in a constant temperature room at 60°C for 1 hour.
It was left to stand for 70 hours to harden.

The binder in the propellant composition is I used the one from

The composition below Fillers for polymers are Those shown in Table 3 below were used.

Table 3 Filler for polymer and its adhesion amount (adhesion amount unit! IT9/crn2) As a result of non-destructive testing of ground tea after hardening, it was confirmed that there was complete adhesion between the ground tea and the primer. As a result of conducting a combustion test on this rocket engine,
All burned normally.

A peel strength test sample was prepared using the same composition used to produce the ground tea described above, and a peel strength test between the ground tea and the primer was conducted.

The results are shown in Table 4. Example 2 The same procedures as in Example 1 were carried out except that a polysulfide composite propellant composition (Table C-5) was used as the propellant composition.

A peel strength test between the ground tea and the primer was conducted on the ground tea after hardening.

The results are shown in Table-6. The binder in the propellant composition had the following composition.

Example 3 The polymer filler used in Example 1 was evenly interposed between the ground tea composition in Example 1 and the ground tea composition for Example 2, and the ground tea was bonded together. We looked at the peel strength between ground tea and ground tea.

The polymer filler, peel strength test, etc. were all those of Example 1 and conducted in accordance with the tests.

Further, the amount of the polymer filler deposited was the same as the amount deposited on the glimer coated surface in Example 1.

1. Example 1 was applied to a casting mold whose inner surface was coated with a mold release agent.
The ground tea composition was cast into a mold and left in a constant temperature room at 60° C. for 2 hours.

A polymeric filler was adhered to the semi-hardened ground tea adhesive surface and left in a constant temperature room at 60° C. for 160 hours to harden.

The unadhered filler on the surface of the hardened ground tea to which the polymeric filler was attached was completely removed, and the ground tea composite of Example 2 was cast on this surface, and the mixture was placed in a constant temperature room at 60°C for 170°C. It was left for a while to harden.

A peel strength test sample was prepared from this cured ground tea and a peel strength test was conducted.

The test results are shown in Table-7.

Example 4 The peel strength between ground tea and glimer was examined when using the polymer filler shown in Table 8.

The results are shown in Table-9.

The composition of the primer composition, the composition of the ground tea composition, the binder composition of the ground tea, the adhesion conditions of the filler, the manufacturing conditions, and the conditions such as the peel strength test were all in accordance with Example 1.

As is clear from the above examples, the composite solid rocket ground tea obtained by the production method of the present invention is
By adhering and intervening an inorganic polymeric filler between ground tea and ground tea or between ground tea and primer, a strong bond can be obtained between the two, and the adhesive strength depends on the polymeric filler. 2. compared to the unused one (conventional product).
There is a remarkable adhesion effect that is 5 to 3 times greater.

In addition, in this invention, like a conventional solid propellant consisting of multiple layers, a polymer compound, a thin metal film, paper, cloth, etc. is attached to the adhesive interface between the ground tea and the ground tea to bond both ground tea together. It has an excellent feature that it is extremely easy to ignite one ground tea from the other ground tea compared to the other ground tea.

Furthermore, by simply adding a simple process and operation of spraying and adhering a polymeric filler to the conventional manufacturing method of this type of ground tea, extremely effective ground tea that has not been found in conventional products can be produced. Now you can get it.

[Brief explanation of drawings]

Figure 1 (A) shows a state in which the polymer filler is wetly applied to the primer surface applied to the inner surface of the engine case or mold, and the open mouth is shown in Figure (A) with a ground tea mixture applied to the wet adhering surface of the filler. It is a partially enlarged cross-sectional view showing a casted and hardened state. Figure 1 is a partially enlarged cross-sectional view of a state in which a polymeric filler is wet-adhered to the surface of the ground tea composition to be adhered, and Figure 2 is a partially enlarged cross-sectional view of ground tea further poured and cured on the filler-adhered surface of Figure 2. 1...Engine case or mold, 2...
... Glimer composition, 3... Filler for polymer,
4... Ground tea composition, 4a, 4b... Ground tea composition with the same or different composition.

Claims (1)

[Claims] 1. Click on the manufacturing method of composite solid rocket propellant to add zinc oxide, aluminum oxide, magnesium oxide, titanium oxide, calcium carbonate, basic magnesium carbonate, silicic acid to the adhesive interface between propellant and propellant or propellant and primer. , a composite solid rocket propellant comprising at least one powdered polymeric filler selected from the group consisting of artificial silicate, asbestos, clay, mica, boron nitride, and carphone. Production method.