CS266982B1 - Pentaerythritol-based release agent - Google Patents

Abstract

Separating agent based on pentaerythritol, which serves as a separator in the production of rubber and plastic products and semi-finished products. It consists of pentaerythritol with a purity of 95 to 98% as the main separating component and other auxiliary substances that act as wetting agents, anti-corrosion agents and foam inhibitors. The separating agent can be used in various operations such as vulcanization, extrusion, separation of rubber products and in storage.

Description

The invention relates to a pentaerythritol-based release agent for rubber and plastic products and semi-finished products, which consists of 0.1 to 10% by weight of pentaerythritol, with a purity of 95 to 98%, 0.1 to 5.0% by weight, of surfactants. of ionic, nonionic or ampholytic character, such as sulfonates, alkylanyl polyglycol ethers, sulfates of substituted polyglycolethenes, alkyl polyglycol ethers and mixtures thereof, 0.1 to 2.0% by weight, corrosion inhibitors such as alkanolamines, alkanolamine derivatives, sodium benzoate, acylated or alkylatedglyanolamines 0.001 to 0.2% by weight, a defoamer based on a water-soluble nonionic surfactant based on copolymers of ethylene oxide and propylene oxide and the remainder up to 100% by weight is water. .

They use various release agents such as aqueous solutions of soaps, surfactants, silicone emulsions and other release agents to protect against sticking of rubber and plastic materials and products in the process of vulcanization to the surface of molds and blocks used in the manufacture of tires, mandrels and die nozzles.

Separating agents are also used to prevent sticking of rubber foils, belts, tire treads, rubberized textiles and pellets of raw materials ready for vulcanization. Chains, kaolin, slip and other powders are used as release agents of this kind. The disadvantage of these separating agents is their high dustiness during application, which considerably impairs the hygiene of the working environment.

These disadvantages are eliminated by the separating agent according to the invention, the main component of which is an aqueous solution of pentaerythritol and other auxiliaries. The use of pentaerythritol as a separating agent is not yet known from the literature. After evaporation of the water, a transparent film is formed, which perfectly separates the rubber and plastic products from the molds and subsequently protects these products against sticking during storage, such as e.g. rubber strips stacked on top of each other, rolls of rubber pads, etc.

The separating agent according to the invention is suitable for use in vulcanization processes - production of rubber goods, tires, air tubes, etc.

By way of illustration, examples of the preparation of release agents are given, but do not limit the scope of the invention.

Example 1

Separation agent prepared by homogenization at 80 ° C.

The composition of the separating agent is:

5.0% by weight, pentaerythritol

1.0% of a nonionic surfactant based on alkylanyl polyglycol ethers

0.2% by weight, defoamer based on copolymers of ethylene oxide and propylene oxide 0.1% by weight, sodium benzoate

93.7% by weight, water

The separating agent is intended for the treatment of rubber vulcanization molds. It is applied by spraying. '

Example 2

Separating agent prepared by dissolving said components in water at 60 ° C. The separating agent consists of:

10.0 % mass pentaerythritol 2.0 % mass alkyl polyglycol ether surfactant 0.75 % mass corrosion inhibitor diethanolamine and triethanolamine in a ratio of 1: 1 87.25 % mass water

CS 266 982 Bl

The separating agent concentrate thus prepared can be diluted with water to any concentration, e.g. in a ratio of 1: 5 and can be used as an anti-sticking agent for rubber strips and foils in rolls.

Claims (1)

The release agent concentrate thus prepared can be diluted with water to any concentration of, for example, 1: 5, and can be used as an anti-sticking agent for rubber bands and foils in rolls. DISCLOSURE OF THE INVENTION A pentaerythritol-based release agent for rubber and plastics products and semi-finished products, characterized in that it comprises 0.1 to 10% by weight of rubber. % pentaerythritol with a purity of 95 to 98% by weight of 0.1% by weight. % to 5.0 wt. surfactants of the ionic, nonionic or ampholytic nature, such as sulfonates, alkylaryl polyglycol ethers, polyglycol ether substituted sulfates, alkyl polyglycol ethers and mixtures thereof, 0.1 to 2.0 wt. inhibitors of corrosion such as alkanolamines, alkanolamine derivatives, sodium benzoate, acylated or alkylated alkanolamine polyglycol ethers, 0.001 to 0.2 wt. water-soluble ionic surfactant-based antifoam based on copolymers of ethylene oxide and propylene oxide and the remainder up to 100% by weight of water.