JPH04277533A - Surface treatment of golf ball - Google Patents

Abstract

PURPOSE:To improve the adhesion between a golf ball and a paint by surface- treating the ball with an aqueous hydrochloric acid containing a metal hypochlorite before it is painted. CONSTITUTION:Aqueous hydrochloric acid containing a metal hypochlorite is obtained by dissolving 0.02-40wt.% metal hypochlorite in aqueous hydrochloric acid of a hydrochloric acid concentration of 0.05-20wt.%. Before a golf ball is painted, it is immersed in this solution, surface-treated at 10-30 deg.C for 3-12min, washed with water and dried.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for surface treatment of golf balls. In particular, the present invention relates to a golf ball surface treatment method for increasing the adhesion between the golf ball and the golf ball coating.

0002

2. Description of the Related Art Golf balls are usually put on the market in a painted form to increase their commercial value and improve their appearance. However, since golf balls are subjected to extremely strong impact force or frictional force, the adhesion between the coating film and the golf ball must be high. This coating film and golf ball (
Hereinafter, painted golf balls are referred to as "painted golf balls".
The unpainted ball is simply called a "golf ball." ) Various measures have been taken to chemically or physically increase the adhesion between the two. For example, physical pretreatment is suggested by buffing or shot blasting the surface of the golf ball. However, although this is effective, the effect is small and is unstable and has many variations. Further, after these physical treatments, methods such as framing treatment, corona discharge treatment, and using chlorinated water have been carried out, but these are not satisfactory in terms of adhesion.

0003

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for simply and easily treating the surface of a golf ball to improve its adhesion to paint.

0004

[Means for Solving the Problems] That is, the present invention provides a method for surface treatment of a golf ball, in which the surface of the golf ball is treated with hydrochloric acid water containing a metal salt of hypochlorite before painting the golf ball. In the golf ball surface treatment method of the present invention, hydrochloric acid water containing a metal salt of hypochlorite is used. Examples of the metal species of the metal hypochlorite include alkali metals and alkaline earth metals. Specifically, examples of the alkali metal include sodium and potassium. Examples of alkaline earth metals include calcium, strontium, and barium. Sodium and calcium are preferred. One or more types of metal hypochlorite may be used. The content of hypochlorite metal salt in hydrochloric acid water is 0.02 to 40w
t%, especially 0.05 to 30 wt% is preferred. 40wt
If it exceeds %, the amount of chlorine added is too large and the adhesion becomes alienated. 0 again
．． When the amount is less than 0.02 wt%, the amount of chlorine added is too small, resulting in poor adhesion. Further, the concentration of hydrochloric acid in the hydrochloric acid solution is preferably 0.05 to 20 wt%, particularly 0.1 to 15 wt%. If it exceeds 20 wt%, it remains as excess hydrochloric acid, which impairs paint adhesion. 0 again
．． If it is less than 0.05 wt%, the concentration will be too low and the adhesion will be poor.

[0005] Golf balls are surface-treated, for example, by immersing the golf ball in the above-mentioned hydrochloric acid solution containing metal salts of hypochlorite. For example, immersion is carried out at 10 to 30°C for 3 to 30 minutes.
It is carried out for 120 minutes, preferably 3 to 60 minutes. Note that the golf ball may be subjected to physical pretreatment as described above (i.e., buffing, shot blasting, framing, corona discharge treatment, etc.) before dipping.
This further improves the adhesion between the golf ball and the paint. After soaking, the golf ball is subjected to conventional post-processing, such as washing and drying, and then painted. Painting may be done in the usual manner. The paint is not particularly limited either, and may be either enamel or clear paint, and urethane paint, epoxy paint, acrylic paint, etc. can be used. Preferably it is a urethane paint.

Golf balls subjected to the surface treatment method of the present invention include, for example, solid golf balls manufactured by vulcanization molding from a rubber composition containing a base rubber and a co-crosslinking agent, or solid golf balls manufactured with a cover layer. Examples include, but are not limited to, coated wound golf balls and the like.

[0007] In the solid golf ball, examples of the base rubber include high-cis polybutadiene, isoprene rubber, and EPDM. α as a co-crosslinking agent
, β-unsaturated carboxylic acid metal salts. Examples of the metal species of the metal salt include zinc, calcium, and aluminum. Examples of the α,β-unsaturated carboxylic acid include (meth)acrylic acid. Furthermore, α,
The β-unsaturated carboxylic acid metal salt may be generated in the rubber composition system. For example, instead of or in combination with the α,β-unsaturated carboxylic acid metal salt, a corresponding α,β-unsaturated carboxylic acid and a metal hydroxide or oxide may be blended into the rubber composition. . Other free radical initiators are included in the rubber composition. Free radical initiators include dicumyl peroxide, t-butyl peroxybenzoate, t-
Examples include butylcumyl peroxide, 1,1-(t-butylperoxy)-3,3,5-trimethylcyclohexane, and the like. Other additives such as anti-aging agents, fillers, etc. may also be incorporated. In the composition of the rubber composition, 5 to 70 parts by weight of an α,β-unsaturated carboxylic acid metal salt and 0.5 to 10 parts by weight of a free radical initiator are blended with respect to 100 parts by weight of the base rubber. is preferred. A solid golf ball is manufactured by kneading and vulcanizing the above-mentioned rubber composition in a conventional manner.

[0008] In the thread-wound golf ball, the cover layer covering the thread-wound core is made of 30% transpolyisoprene.
It is preferable to use a vulcanized molded product of a rubber composition containing at least 50% by weight, preferably at least 50% by weight. Such wound golf balls are manufactured by methods well known to those skilled in the art.

[0009]

According to the method of the present invention, the surface of a golf ball can be treated simply and easily, thereby improving the adhesion between the golf ball and paint.

0010

[Examples] The present invention will be specifically explained below using examples. Manufacturing of golf balls (Manufacturing example A) Compounding agent

Part by weight High-cis polybutadiene (
BR11, made by Japan Synthetic Rubber) 100
zinc oxide

23 Methacrylic acid

24 Dicumyl peroxide
1.5 The rubber composition having the above composition was uniformly kneaded, vulcanized and molded at 160° C. for 30 minutes, and then the ball surface was sandblasted for 30 minutes to produce a solid golf ball A.

(Production Example B) 7 transpolyisoprene
A rubber composition consisting of 0 parts by weight, 20 parts by weight of natural rubber, and 10 parts by weight of high styrene resin (styrene; 85 wt%) was vulcanized with sulfur to prepare a cover layer, and this was coated on a thread-wound core to make a thread-wound golf ball. Ball B was manufactured.

Preparation of Surface Treatment Agents (Preparation Examples I to VI) Surface treatment agents I to VI were prepared by uniformly mixing the respective ingredients in the respective compositions (wt%) shown in Table 1.

[0013]

[Table 1]

Surface treatment of golf balls and production of coated golf balls (Examples 1 to 20 and Comparative Examples 1 to 8) Golf balls A and B produced in Production Examples A and B, respectively, were treated in Preparation Examples I to VI above. In each of the surface treatment agents I to VI prepared in
After surface treatment by immersion at ℃ for the immersion time shown in Table 2,
Each golf ball was washed with water and dried, and then the surface of the golf ball was coated with the primer shown in Table 2 to produce each coated golf ball. In addition, Comparative Examples 3 to 4 and 7 to 8 were not subjected to surface treatment with a surface treatment agent. In addition, adhesion tests were conducted on the coating films of each of the coated golf balls obtained, both initially and after weathering, and the results are also shown in Table 2.

[0015]

[Table 2] 1): Primers P1 and P2 are urethane enamel and urethane clear coating, respectively. All of these are prepared using a polyester polyol as a base material and an HMDI curing agent. 2): For initial adhesion, after drying the coating film of the painted golf ball, the painted golf ball was submerged in water for one day, and then the painted golf ball was taken out and then applied to an impact plate 100 times at a ball speed of 45 m/s. to assess paint removal. ◎ indicates that there was no peeling, and × indicates that paint peeled off over a wide area. △ indicates that paint peeling was observed in some areas. 3): Adhesion after weathering is determined by applying 100% to the impact plate at a ball speed of 45m/s after 100 hours of irradiation with a Weather-Ometer.
Check for paint peeling. Furthermore, a peel test was performed on the same ball using cellophane tape. ◎ indicates that there is no peeling when hammered and there is no peeling in the cross-cut peeling test, and × indicates that peeling is observed when hammering and peeling occurs even in the cross-cut Sellotape peeling test. △ did not peel off when hammered, but peeling was observed in the cross-cut Cellotape peeling test.

Claims (1)

[Claims] 1. A method for surface treatment of a golf ball, which comprises treating the surface of the golf ball with hydrochloric acid water containing a metal salt of hypochlorite before painting the golf ball.