Stable pentane eco-friendly foaming agent used for polyurethane foaming

Abstract

The invention provides a stable pentane eco-friendly foaming agent used for polyurethane foaming. The foaming agent is characterized by comprising, by weight part, 11-19 parts of cyclopentane, 16-28 parts of pentane, 23-36 parts of isopentane, 0.5-5 parts of oleic acid, 31-47 parts of deionized water and 0.5-2 parts of an emulsifier. The scheme of the preparation technology comprises: weighing cyclopentane, pentane and isopentane according to the design formula, carrying out mechanical stirring for mixing for 5 min, adding oleic acid and the emulsifier, performing stirring for 10-20 min, adding deionized water, allowing the obtained product to enter a homogenizer, performing homogenization at a low temperature in the protection of nitrogen, and canning the obtained product for standby to obtain the eco-friendly foaming agent. The foaming agent has prominent feature that many kinds of pentane and oleic acid are emulsified, with the assistance of water, so that defects that pentane is flammable and explosive and is not prone to store are overcome. In a polyurethane foamed system, the foaming agent is uniform in dissolution dispersity, stable and uniform in forming and stable in foaming size.

Description

technical field [0001] The invention belongs to the technical field of foaming thermal insulation materials, and in particular relates to a stable pentane-based environmentally friendly foaming agent for polyurethane foaming. Background technique [0002] As one of the six most concerned synthetic materials in the world, the polyurethane (TPU) industry has expanded rapidly in recent years. According to the "2016-2022 China Polyurethane Industry Market Trend Forecast and Trend Forecast Research Report", the global output of polyurethane (TPU) products has exceeded 21 million tons, and it is expected to reach 28.6 million tons in 2018. There are currently more than 2,000 polyurethane companies in my country. Foam companies, of which foam system and non-foam system products account for half of the country, have attracted much attention for their huge growth potential. [0003] Polyurethane foam is a foam product made of polyether polyol and isocyanate under the action of a blow...

AI Technical Summary

Problems solved by technology

There are disadvantages in each of the three blowing agents: when cyclopentane is used, the safety of the blowing agent should be considered, and the foam density prepared at the same time is relatively high, and the dimensional stability of the foam is slightly poor; when using HFC-245fa to prepare foam When using HFC-365mfc to prepare foam, the temperature of the combined material needs to be lowered appropriately, generally 15-18°C; when using HFC-365mfc to prepare foam, there is also the problem of flash point, and the safety performance of the blowing agent is not good.

The price of raw materials of HFC-245fa and HFC-365mfc is relatively high, and the cost of the prepared foam increases significantly

On the other hand, in order to reduce the cost of foam and improve the low thermal conductivity of foam, the technology of mixing cyclopentane and HFC-245fa as blowing agent has been reported, but there is no mention of foam formulation technology

Simultaneously above-mentioned prior art also has the problem of following generality: because the boiling range of blowing agent is less, can be subjected to the influence of environmental conditions when foaming bigger, as geographical environment, weather condition (humidity), influences the diffusion or hair of foam Foam, also reduces the operability of foaming, and ultimately affects the overall performance of the foam

However, condensation occurs due to the high boiling point of existing cyclopentane, and the dissolution and erosion of the matrix by cyclopentane itself increases the density of foamed plastics, and the foaming effect is not ideal.

Technicians try to improve by other pentane, but due to its instability and difficulty in uniform dispersion, it is not ideal in how to combine, how to store and how to use