BE899435A - Polychloroprene phenolic resin mixt. adhesive compsn. - contains isocyanate hardener, vulcanisation accelerator, adhesion promoter and accelerator and solvent - Google Patents

Abstract

Adhesive comprises (1) a mixt. of polychloroprene polymer with a solid, reactive and thermosetting alkyl or aryl type phenolic synthetic resin (I); (2) an isocyanate type hardener, pref. diphenylmethane-dissocyanate, (3) a vulcanisation accelerator of the sulpho-organic type, pref. tetramethylthiurane disulphide; (4) an adhesion promoter which increases the modulus of elasticity; (5) an adhesion accelerator of the volatile amine type ad (6) a solvent.

Description

       

  <1> polychloroprene-based glue to fix the

  
tennis racket sieve strings and method

  
One of the problems with the stringing of the tennis racket is the slipping of the strings when striking the ball.
- how strings reduce the impact energy, rapidly decreases the elasticity of the sieve and as a result of friction between them, the strings wear out quickly.

  
There are processes and products that are marketed to prevent this slippage, but they have not responded to the concerns.
- players' hats because they greatly reduce the performance of the racket strings.

  
The glue of this present invention applied to the crossings of the strings of the tennis racket prevents) not only, the sliding thereof, but also allows to dampen the vi-
-brations when striking the ball, to improve the yield and very significantly increase the longevity of the rope.

  
The glue application process of this present invention
- it allows to facilitate the work, to save time and to avoid the glue pouring.

  
The glue of this present invention characterized by a mixture
-ge of a polychloroprene polymer with a solid synthetic resin of the alkyl or aryl phenolic type, reactive, thermosetting-
-the. The mixture dissolved in solvents is added with a hard
-cisseur, adhesion accelerator, vulcan accelerator-
-canization, of a bridging agent promoting adhesion and increasing-
-the modulus of elasticity.

  
The polychloroprene polymer has a Mooney viscosity which varies from 70 to 100.

  
Synthetic, reactive, thermosetting resin, of the al- type <EMI ID = 1.1>
-rence of the para-tertiary butyl phenol aldehyde type; prepared by the condensation of an excess of aldehyde with the para-tertiary butyl <EMI ID = 2.1>

  
The hardener is of the isocyanate type, preferably diphenyl-
-methanediisocyanate.

  
The vulcanization accelerator is of the sulfo-organic type, preferably tetramethylthiuram disulfide.

  
The adhesion accelerator is of the volatile amine type, preferably morphine; this quickly develops adhesion and gives good solubility of polychloroprene.

  
The bridging agent, promoting adhesion, increasing the elastic modulus is (CH3) mSi (OCH3) 4-m 'm varies from I to 3. The formula

  
 <EMI ID = 3.1>

  
The solvents used to dissolve the constituent elements of the adhesive can be chlorinated hydrocarbons, hydrocarbons,
-aromatic hydrocarbons, aliphatic hydrocarbons, ketone solvents and esters, as well as any other solvent capable of dissolving the components of the adhesive.

  
You can also add fillers, pig-
-ments to improve or to color the glue.

  
The glue of this present invention is suitable for all types of rope (nylons, synthetics, natural casings, etc.) after drying, it remains elastic, flexible and has great adhesive power.

  
The pros are given below by way of nonlimiting example.
weight percent of the components of a preferred adhesive of this invention.

  

 <EMI ID = 4.1>
 

  
 <EMI ID = 5.1>

  
I) Glue deposit:

  
The glue is deposited at the crossings of the cords in the area

  
hitting (sweet spot) of the sieve of the tennis racket.

  
To facilitate the work, to save time and to regularize the quantity of glue at each crossing; the glue is poured into a syringe, preferably graduated, with 4 outlet orifices

  
the syringe is positioned vertically so that its 4 outlets are at the 4 corners of the crossing of the strings; the piston is actuated to release the glue.

  
Fig I: diagram of the syringe Fig 2: view of the 4 outlets

  
I: outlet port

  
2: groove for positioning the syringe Fig 3: diagram of the glue deposited at a crossover of the strings.

  
2) Vulcanization of the glue deposited:

  
To prevent the deposited glue from falling by its gravity and to speed up the vulcanization process, the glue is heated
-with turning the racket in a rotating oven at regulated temperature
-ble from 25 [deg.] C to 85 [deg.] C.
- At 25 [deg.] C the complete vulcanization is 5 hours.
- At 85 [deg.] C the complete vulcanization is one hour.

  
The good speed of rotation of the racket, without glue pouring or without problems caused by centrifugal force, is between 4 rpm and 40 rpm.

  
Fig 4: diagram of a rotary kiln.

  
I: racket

  
2: drying room

  
3: rods or plates to fix the

  
racket

  
4: motor 5: thermostat

  
6: hot air inlet

  
7: blower

  
8: air flow control

  
9: support to fix the 3

  
The diagrams of this present invention are only non-limiting examples of the syringe with 4 outlets and the rotary kiln. It is understood that the change in shape of the syringe and or the technical change of the rotary kiln does not deviate from this process.


    

Claims (2)

CLAIM: a) - The adhesive of this present invention characterized by: I) a mixture of a polychloroprene polymer with a solid synthetic resin of the alkyl or aryl phenolic type, reacts -tive, thermosetting; this synthetic resin is a para-tertiary butyl phenol aldehyde type resin, prepared by the condensation of an excess of aldehyde with the para-tertiary butyl phenol, in the presence of an alkaline catalyst. 2) the hardener is of the isocyanate type, preferably diphenylmethanediisocyanate. 3) the vulcanization accelerator is of the sulfo-organism type -nique, preferably tetramethylthiuram disulfide. 4) the agent promoting adhesion, increasing the module of <EMI ID = 6.1> -ference m = 3. 5) the adhesion accelerator is of the volatile amine type, preferably morpholine. 6) the solvents used to dissolve the elements -ititives of the glue can be ketone solvents, aromatic hydrocarbons, esters, chlorinated hydrocarbons, aliphatic hydrocarbons. 7) its use is to fix the strings of the sieve of the tennis racket or to stick various objects. b) - The adhesive application process characterized by-, I) a syringe with 4 outlet ports. 2) an oven rotating at a heating temperature between 25 [deg.] C and 85 [deg.] C and at a rotation speed between 4 revolutions / min and 40 revolutions /  <EMI ID = 7.1>