Method of producing sponged thermoplastic material

专利摘要:
Foamed thermoplastic materials such as coatings, adhesives and structural bodies are made by a method which offers significant advantages and economies. The method involves the steps of stabilizing a dispersion of gas in a molten thermoplastic material by adding a surfactant to the molten material in a sufficient stabilizing amount and subsequently pressurizing the stabilized dispersion to form a hot solution. Thereafter, the hot solution is dispensed under lower pressure whereby the gas is released from solution to form a foamed material. The method is especially advantageous in making hot melt thermoplastic adhesives which are very useful in bonding substrates with efficiency and superior bond strengths. Continuous and reliable foaming operations are achieved with a uniform quality and output of foamed materials. Thermoplastic materials are also capable of being foamed with relatively simple mechanical apparatus and under conditions which provide considerable savings of energy. The number of thermoplastic materials which can be foamed employing the present technique in a controlled manner is unlimited. The method of stabilization is conducted at low or ambient pressures and resulting stabilized hot thermoplastic-gas dispersions may then be pumped with pressurization and dispensed with immediate foaming.
公开号:SU902670A3
申请号:SU782612100
申请日:1978-04-27
公开日:1982-01-30
发明作者:Х.Коббс Вальтер (Младший)；Г.Шонг Роберт
申请人:Нордсон Корпорейшн (Фирма)；
IPC主号:

专利说明:

The invention relates to the preparation of a spongy material based on a thermoplastic polymer and can be used in various industrial fields as adhesives and for the manufacture of spongy products by the method of extrusion or molding.
A known method for producing a spongy thermoplastic material is by supplying gas under pressure to the mass of molten polymer. Upon subsequent release of the molten mass into a medium with reduced pressure, foaming occurs and the sponge material 1J is formed.
According to a known method, gas is supplied under a pressure of 35-211 kg / cm, which requires complex instrumentation .20
The closest to the proposed technical essence is the method of obtaining a spongy thermoplastic material by introducing into the molten thermoplastic material.
a gas meter, homogenizing the resulting composition, creating an overpressure in the composition of from 7 to kg / cm and extruding the composition into the flash zone 2.
However, the half-life of the composition based on the polymer melt and gas is very small, which leads to gas loss during the sponge process.
The purpose of the invention is to increase the viability of the composition and simplify the production technology.
This goal is achieved in that upon receipt of a spongy thermoplastic material by introducing a gas into a molten thermoplastic polymer, homogenizing the resulting composition, creating an overpressure in the composition from 7 to kg / cm and extruding the composition into a sudden discharge zone into a molten thermoplastic poly

权利要求:
Claims (1)
[1]
A method of producing a spongy thermoplastic material by introducing gas into the molten thermoplastic polymer, homogenizing the resulting composition, creating an excess pressure in the composition of 7 to 141 kg / cm ² and extruding the composition into a flash zone, characterized in that, in order to increase the viability of the composition and simplification of the production technology, from 0.1 to 1.1% of the weight of the polymer of the surfactant in the form of a solution or finely ground is preliminarily introduced into the molten thermoplastic polymer the corresponding state with a decomposition temperature higher than or equal to ₄₅ 2 ° C.

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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US05/791,338|US4156754A|1977-04-27|1977-04-27|Method of making foamed thermoplastic adhesive materials and adhesive process therefor|

---