阅读说明：本技术 一种硅胶异型空心管二次成型方法 (Secondary forming method for silica gel special-shaped hollow pipe ) 是由 李厚昌 于 2019-11-12 设计创作，主要内容包括：一种硅胶异型空心管二次成型方法,包括以下步骤：步骤S1、一次低温硫化预成型：将硅胶和硫化剂混炼后得到的混合物通过挤出机挤出成管状体,并将该管状体放置于0摄氏度的冰水中冷却20-30分钟,制得预成型的硅胶圆形空心管；将预成型的硅胶圆形空心管内通入一种可曲饶材料进行形状需求再次预定型；步骤S2、二次高温硫化成型：将预成型的硅胶空心管放置在异型模具中,并在80-180摄氏度的温度条件下烘烤20-90分钟或蒸汽蒸20-90分钟,定型得到硅胶异型空心管。本发明采用硅胶二次成型技术,通过一次低温硫化预成型和二次高温硫化成型,解决了硅胶异型管成型难、形状受限制的缺陷,并且工艺简单,生产效率高,成本低,生产出的产品符合相关食品级测试要求。(A secondary forming method of a silica gel special-shaped hollow pipe comprises the following steps: step S1, primary low-temperature vulcanization preforming: extruding a mixture obtained after mixing the silica gel and the vulcanizing agent into a tubular body through an extruder, and placing the tubular body in ice water at the temperature of 0 ℃ for cooling for 20-30 minutes to obtain a preformed silica gel round hollow tube; introducing a flexible material into the preformed silica gel round hollow tube to perform shape demand presetting again; step S2, secondary high-temperature vulcanization molding: and placing the preformed silica gel hollow pipe in a special-shaped mould, baking for 20-90 minutes or steaming for 20-90 minutes at the temperature of 80-180 ℃, and shaping to obtain the silica gel special-shaped hollow pipe. The invention adopts the silica gel secondary forming technology, solves the defects of difficult forming and limited shape of the silica gel special pipe through primary low-temperature vulcanization preforming and secondary high-temperature vulcanization forming, has simple process, high production efficiency and low cost, and the produced product meets the related food-grade test requirements.)

1. A secondary forming method of a silica gel special-shaped hollow pipe is characterized by comprising the following steps: the method comprises the following steps:

step S1, primary low-temperature vulcanization preforming: extruding a mixture obtained after mixing the silica gel and the vulcanizing agent into a tubular body through an extruder, and placing the tubular body in ice water at the temperature of 0 ℃ for cooling for 20-30 minutes to obtain a preformed silica gel round hollow tube;

introducing a flexible material into the preformed silica gel round hollow tube to perform shape demand presetting again;

step S2, secondary high-temperature vulcanization molding: and placing the preformed silica gel hollow pipe in a special-shaped mould, baking for 20-90 minutes or steaming for 20-90 minutes at the temperature of 80-180 ℃, and shaping to obtain the silica gel special-shaped hollow pipe.

Technical Field

The invention relates to the technical field of silicone tubes, in particular to a secondary forming method of a silica gel special-shaped hollow tube.

Background

The silica gel hollow tube is mainly divided into a high pressure resistant silica gel hollow tube, a gear-shaped silica gel hollow tube, a food-grade silica gel hollow tube, a medical silica gel hollow tube and the like. The silica gel hollow tube has the advantages of environmental protection, no pollution, cold resistance, high temperature resistance, no toxicity and no smell, so that the silica gel hollow tube is widely applied to household appliances (coffee pots, pistachio pots, electric irons, electric cookers, deep fryer, disinfection cabinets, water dispensers, jam machines, bread makers, burners, water heaters and the like) and pipelines of automobiles, medical equipment and oil tankers, and is a good electrically-insulated and sealed liquid conveying pipeline.

The existing silica gel hollow tube usually adopts a compression molding process, but has the following problems: 1. The mould pressing piece is firstly used for manufacturing a mould with a corresponding shape, the cost of the silica gel special-shaped hollow pipe mould is high, the mould manufacturing period is long, the productivity efficiency is low, and the loss and maintenance cost of the mould is also high; 2. The mould pressing piece cannot well control the pipe wall of the hollow pipe such as the silica gel special-shaped hollow pipe due to structural defects in the process, and can not be easily manufactured due to the lack of structural flexibility for repeated bending of market demands, the size and the length of a product are also influenced by the volume of the mould when the mould is manufactured, so that the silica gel special-shaped hollow pipe with longer length can be manufactured by using a plurality of moulds and then bonded, the efficiency of producing the product is low, and toxic substances contained in adhesives can influence the food-grade safety requirements of the water pipe; and the shape, angle, length and pipe wall thickness of the silica gel hollow pipe are limited by compression molding, so that more than three bends are difficult to realize, and the requirements of the market on the diversification of the shape, angle and length of the silica gel hollow pipe cannot be met.

Accordingly, the prior art is subject to improvements and enhancements.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the secondary forming method of the silica gel special-shaped hollow tube, which has the advantages of simple process, high production efficiency and low cost, and the produced product meets the relevant food-grade test requirements.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a secondary forming method of a silica gel special-shaped hollow pipe comprises the following steps:

step S1, primary low-temperature vulcanization preforming: extruding a mixture obtained after mixing the silica gel and the vulcanizing agent into a tubular body through an extruder, and placing the tubular body in ice water at the temperature of 0 ℃ for cooling for 20-30 minutes to obtain a preformed silica gel round hollow tube;

introducing a flexible material into the preformed silica gel round hollow tube to perform shape demand presetting again;

step S2, secondary high-temperature vulcanization molding: and placing the preformed silica gel hollow pipe in a special-shaped mould, baking for 20-90 minutes or steaming for 20-90 minutes at the temperature of 80-180 ℃, and shaping to obtain the silica gel special-shaped hollow pipe.

The invention adopts the silica gel secondary forming technology, solves the defects of difficult forming and limited shape of the silica gel special pipe through primary low-temperature vulcanization preforming and secondary high-temperature vulcanization forming, has simple process, high production efficiency and low cost, and the produced product meets the related food-grade test requirements.

Detailed Description

The invention is described in further detail below:

a secondary forming method of a silica gel special-shaped hollow pipe comprises the following steps:

step S1, primary low-temperature vulcanization preforming: extruding a mixture obtained after mixing the silica gel and the vulcanizing agent into a tubular body through an extruder, and placing the tubular body in ice water at the temperature of 0 ℃ for cooling for 20-30 minutes to obtain a preformed silica gel round hollow tube;

introducing a flexible material into the preformed silica gel round hollow tube to perform shape demand presetting again;

step S2, secondary high-temperature vulcanization molding: and placing the preformed silica gel hollow pipe in a special-shaped mould, baking for 20-90 minutes or steaming for 20-90 minutes at the temperature of 80-180 ℃, and shaping to obtain the silica gel special-shaped hollow pipe.

The known techniques are: the flexible material, the proportion of the silicon rubber and the vulcanizing agent, and the components and the proportion of the vulcanizing agent.