JPS61176051A - Base cement for bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of the base cement for wA tubes, and has special features;
The particle size distribution of the inorganic filler added thereto is regulated.

[Technical Background of the Invention and Problems Therein] An end part (biaxial or dish-shaped base) of a general tube F1 lamp body such as a Komi bulb or a fluorescent lamp is adhered with paste cement l2. .

Pace cement for tubes is made by adding auxiliary agents such as shellac and rosin to a thermosetting resin such as phenolic resin, and then mixing it with an inorganic filler such as calcium carbonate powder, adding alcohol, and kneading it. Apply a suitable amount of the inner surface of the metal opening part C2, cover the end of the lamp body, heat it to harden the thermosetting resin, and attach the cap to the lamp body (2). However, when attaching cement to the tube C, squeeze out an appropriate amount of cement and adhere to the cap, so the viscosity of the cement is appropriate (:, it cuts well after squeezing out, And cap C: The adhered cement is the lamp body (
: Before crowning C; No sagging, as much as possible as in the state of application 1
[(: It is necessary to inherit a similar form.

In order to achieve this objective, the applicant of the present invention has previously regulated the viscosity distribution of the inorganic filler,
proposed as a number. According to proposal 1, the viscosity distribution of the inorganic filler is 31% or less for those that do not pass through 40 meshes (420μ or more) and 25 to 40% for those that do not pass through 100 meshes (149 to 420μ) when using a 0.8 standard sieve. Weight% - 140 mesh passing (74-105μ) 4
9 to 65% by weight and those passing through 200 meshes (74μ or less) should be less than 10% in weight. It was possible to improve the fluidity when descending from the mold hole and heating after deposition.

However, on the other hand (2), the adhesive strength of the cement after assembly is slightly inferior, and if a strong external force is applied, there is a risk that the cap may fall off. Improvements were requested.

[Purpose of the Invention] The present invention has a cutting quality comparable to that of Cement C for tubes proposed in Japanese Patent Application No. 53-133184, sagging after adhesion,
Another object of the present invention is to provide a cement for tubes that has fluidity when heated, has high adhesive strength, and is free from the risk of falling off of the cap.

[Summary of the Invention Particle size distribution of the inorganic filler is U, 8 standard sieves C2, those that do not pass 40 meshes (420μ or more) 3 weight or less, those that do not pass 100 meshes (149 to 420μ) 30 to 39 Weight%, 140 mesh failure (105-1
49μ) 10-17% by weight, 200 mesh non-passable (74-105μ) 49-60% by weight, 200
Since the weight of the mesh passing through the mesh (74μ or less) was 7- or less, the above-mentioned objective was achieved.

[One Embodiment of the Invention] The present inventor investigated the relationship between the particle size distribution of the inorganic filler and the adhesive strength.
33184 Proposal 7 Men) C is not included 140
It was found that the particle size of the mesh non-passability (105 to 149 μ) rank has a strong relationship with the adhesive strength C.
Further research led to the discovery of a preferable particle size distribution containing the above-mentioned 140-mesh non-passable 2-ink particles, thereby completing the present invention.

Hereinafter, the details of the present invention will be explained using examples (first,
An example of a general blend of pace cement is shown in Table 1 C-2 below.

Here, resins refer to thermosetting resins such as novolac type phenolic resins, hardening agents such as hexamethylenetetriamine, and shellac and cocoon gin. Using charcoal calcium powder, mix the ingredients listed above and 1.
Mix for 5 to 2 hours to form a cement haze, and extrude an appropriate amount of this from the annular nozzle of the feeder to coat the inner surface of the cap shell. As shown in the figure. (1) is this cap, aυ is the other cap (1
) ゛ cylindrical shell, a3ti, this shell a1
) is the top surface of the insulating glass (2), and the opening inner surface C of this shell (Ll) is annular (Nibase cement (2) ) is the adhesion.However, this cement (
2) At the time of deposition (Yu has an almost semicircular cross section,
It has the property of slightly drooping over time as shown by the dashed line.

As shown in Figure 2C, the base (1) coated with cement (2) is shown in Figure 2C; Connect e1). Then, if heated in a heating furnace, cement (2)
is softened and interposed between the tube (3) and the cap shell I without a gap, and in this state it softens and adheres the two.

In this way, put 1 unit of cement (2) into the cap (1 unit) in good condition.
) C Yu adheres well, good ) (2) The 11th baking does not sag before the process, and when heated C;
; It is necessary to flow and be properly interposed between the tube (3) and the shell (11) without creating a gap. Then, the breakage and sagging of the cement (2) are caused by the adhesion of the cap (1).
) can be visually measured as τ; Therefore, it can be determined that the good fluidity is l! As shown in Figures 3 and 4, approximately 2υ2? of cement was collected into a spherical shape and placed on a brass plate (4).
Heated for about 10 minutes at 170°C ± 10°C in an electric constant temperature oven, and averaged the lengths A and H in both orthogonal directions in the flowing state (c) (0 indicated by the broken line) [measured by human B / 2] .

Further, the strength of the bonded nine caps (1) is expressed by the breaking strength when the cap (1) is twisted in terms of torque (It-, . . . ).

In addition, the adhesive strength of the cap (1) exceeds the standard, and it can be used for 90 hours with a 100 W ordinary light bulb C.
Since the target was an adhesive strength of -em or higher, the next product that met this target was considered a good product.

However, the research of the original spatula (Yuyo, Cement (2)
It is known that the cutting, sagging, fluidity, and adhesive strength of the inorganic filler are affected by the particle size distribution of the inorganic filler, so inorganic filler samples with various particle size distributions [I.

[■ Co and [■] were adjusted, and according to the formulation C in Table 1, cement) (21 (21) was prepared using the method C described above; therefore, its properties were investigated.

First, the particle size distribution of the inorganic filler [11, [1 Cor [■]] was measured to see if it would pass through a U, 8 standard sieve or not, and the results are shown in Table 2 below.

Table 2 (wt%) Next, the test results of cement (2) using these inorganic fillers [■] 9th - [■ are shown in Table 3 below. @3 Table In addition, in this table, the number of samples measured for flow length and torsional strength is 10, and for other items (100 for each), if even one defect occurs, the entire sample will be was considered defective.

As a result of further experiments in addition to the above experiments, we found that the effects of the present invention, namely, cement cutting, sagging, and fluidity C.
In addition, the preferred particle size distribution of the ninth inorganic filler that can obtain sufficient torsional strength was found.
μ or more) 3 weight or less, 100 meshes not passed (
149-420μ) 30-39% by weight, 140
Mesh 7 V 3 - Non-passable (105-149 p) 10-17 Weight - 1200 mesh non-passable (74-1
05μ) 49 to 60% by weight, 200 mesh passing (74μ or less) 7weight - All the following passed the above 4 characteristics g 2 0 Then, the amount that did not pass loo messier was 30% by weight 6 or less than 200 meshes
If the content of fine particles exceeds 0% by weight or exceeds 7% by weight through the ti 200 mesh, the cement will break and sag well, but the fluidity during heating will be poor. Adhesion cannot be obtained. (9) If there are many relatively large particles, such as the proportion that does not pass through 100 mesh exceeds 39% by weight, the proportion that does not pass through 200 mesh is less than 49% by weight, or the proportion that does not pass through 40 mesh exceeds 3% by weight. It has good fluidity when heated, but it has poor breakage and drooping, and the amount of adhesion becomes uneven, which is undesirable.0 Furthermore, if the amount of 140 mesh that does not pass through is less than 10% by weight, the adhesive strength is insufficient, and the 17 weight %, other particle size components become insufficient and the above-mentioned disadvantages occur. Therefore, in the present invention, the particle size distribution of the inorganic filler was limited as described above.

The base cement of the present invention can be used for adhering the caps of other tubes, and the inorganic filler may be powders of other known substances.

[Effects of the Invention] The base cement for tubes of the present invention has a particle size distribution of the inorganic filler blended with the thermosetting resin, which is sieved through U and S standard sieves (3 weight or less, which does not pass through 40 mesh). 100
30 to 391 t% of items that do not pass the mesh, 10 to 17 weight % of items that do not pass the 140 mesh, 49 to 60 weight % of the items that do not pass the 200 mesh, 7 weight % or less of the item that does not pass the 200 mesh? Because of its ratio, it is not inferior to the one proposed in eH No. 53-133184 in terms of cutting quality when adhering cement, drooping after adhesion, and fluidity during heating, and it also has a 140 mesh non-passage component. By adding C, adhesive strength significantly exceeding the above proposal was obtained.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an example of a tube cap to which the base cement for tubes of the present invention is bonded, Fig. 2 is a cross-sectional view of an example of a companion tube to which the cap is also bonded, and Fig. 3 is a sectional view of the above. The heating of the cement (a front view showing the fluidized state due to the heating process, and Figure 4 is a plan view as well. (1) - Base cement (2) - Base cement (
3)--Tube body αυ--Base shell (l)-
Insulation is 2 steps Residential - Fillet 01) - Lead wire

Claims (1)

[Claims] In thermosetting resins blended with inorganic fillers, the particle size distribution of the inorganic fillers is U. S standard sieve, 3% by weight or less that does not pass 40 mesh, 100
The content is 30 to 39% by weight of items that do not pass through mesh, 10 to 17% by weight of items that do not pass through 140 mesh, 49 to 60% by weight of items that do not pass through 200 mesh, and 7% by weight or less of items that do not pass through 200 mesh. Base cement for tubes.