JPS6096616A - Production of lightweight asphalt foam - Google Patents

Abstract

PURPOSE:To produce the titled lightweight foam of excellent durability, by adding a specified urethane prepolymer and PS resin pellets containing a blowing agent to an aqueous asphalt emulsion and foaming the resulting mixture. CONSTITUTION:An aqueous asphalt (A) is obtained by dispersing 1pt.wt. asphalt in 0.3-2.0pts.wt. water containing a cationic or anionic surfactant. 100pts.wt. component A is mixed with 5-250pts.wt. (B) urethane prepolymer obtained by reacting a polyetherpolyol of an ethylene oxide content >=15wt% with an organic isocyanate, (C) PS resin pellets containing a blowing agent, and (D), optionally, fillers, foam stabilizers, pigments, etc., and the resulting mixture is foamed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method of manufacturing a lightweight asphalt foam.

Joint materials used in houses, vehicles, or civil engineering work are required to have the basic properties of water repellency and softness.One of these joint materials is the water repellency and foaming of asphalt. It has been known for some time that it utilizes the body's physical strength (hereinafter referred to as asphalt foam). However, because conventional asphalt foams are manufactured by impregnating urethane foams with open bubbles with bath-molten asphalt or asphalt emulsion, there are problems such as unevenness in impregnation and the inability to obtain uniform quality. There were ingredients. However, the asphalt attached to the air bubbles of the foam due to impregnation is relatively easy to detach, so if it is repeatedly compressed, the impregnated asphalt will gradually be lost and the quality will deteriorate. there were.

Therefore, we have previously proposed a method for preparing asphalt foam that does not cause unevenness or deterioration of quality. That is, this production method involves adding a urethane prepolymer obtained by reacting a polyether polyol with an ethylene oxide loading rate of 15% or more with an organic incyanate to an aqueous emulsion of asphalt, water, silicone oil, etc. as necessary. It is made by adding and mixing the regular c-packet R[1], fillers, and other additives to make it light weight. In the asphalt foam produced in this manner, the asphalt itself has dried up as a foam base, so the asphalt is not separated from the base and quality does not deteriorate. Because the asphalt emulsion is uniformly dispersed by the foaming action, mechanical stirring, and stirring, there is no unevenness in quality. In this way, the problems of uneven quality and deterioration of crystalline C1 in conventional asphalt foams have been solved by the asphalt foam manufacturing method previously proposed by Ig.

By the way, asphalt foam has a high ratio of 1F (asphalt), so its weight is small.

Therefore, 4 general trades are occupied, and 1 prefecture is involved in civil engineering work, and 1 prefecture is involved in construction work for large-scale works that are reused once every 11 years.
．． There were 4.

The present invention is directed to asphalt foam 1ltz i7. l
This was the result of intensive research aimed at developing a Y-type asphalt foam, and the applicant discovered a method for producing a Y-shaped asphalt foam by improving the method for producing an asphalt foam that the applicant had previously proposed.

That is, the present invention uses a urethane prepolymer obtained by reacting a polyether polyol containing 1415% or more of ethylene oxide with an isocyanate, a polystyrene containing a blowing agent, and an aqueous emulsion of asphalt. A month pellets, water as needed, alcohol (foaming agent, filling 4 years old, and other additives are added and mixed to form a 14-sided asphalt foam)
;a) fM method.

As mentioned above, 1,1 (the invention differs from the asphalt foam manufacturing method previously proposed by the applicant in that it uses polystyrene resin pellets containing a blowing agent, and
According to this requirement, the transformation of asphalt foam into a monster was achieved. This '11';I polystyrene containing a private agent, 'jA)f'i as a parent, propane, butane or petroleum ether.
You can use a commercially available 7 days a week containing foamed MIJ once a month.

The aqueous emulsion of asphalt used in the present invention uses cationic or anionic threads as a surfactant, and asphalt is mechanically immersed in water.

Fourth, it can be obtained by emulsion technology of "dispersion, dispersion, public lighting". In this case, the asphalt can be natural asphalt, or straight asphalt obtained as a residue from distillation of crude oil. Alternatively, blown asphalt, which is oxidized and polymerized by introducing heated air therein, may be used.

Also, the ratio of asphalt to water # - Ha asphalt 1
It is a shame to use 0.3 to 2.0 parts by weight of water per 1Ws of water. When the water content is less than 0.3 parts by weight, it is difficult to obtain a uniform emulsion;
: If the asphalt is exceeded, there will be less asphalt and the asphalt foam with the desired properties will not be formed.

The urethane prepolymer used in the present invention not only serves as a blowing agent, but also remains in the asphalt foam and functions as a connecting material or filler. As such a urethane prepolymer, in particular, a reaction product of a polyether polyol having an ethylene oxide L-4 ratio of 15% or more and an organic incyanate is used! The reason for using 1zu is as follows. That is, since the asphalt component is added as an aqueous emulsion as described above, the urethane prepolymer in this case is required to have good affinity with water, and the urethane prepolymer meets this requirement. It is.

This urethane prepolymer is entangled in a wide range of 5 to 250:a-itJ parts per 100 parts of asphalt emulsion, which indicates 0T7+. In other words, if the amount of urethane pre r
:I'L'L. On the other hand, addition of urethane prepolymer:
fF<? 4, a foam-rich asphalt foam is obtained. In any case, the joint (A, the older brother, & the asphalt form to be visited is 1;
I can do something. In particular, when asphalt-rich asphalt foam is used in a molded form, it is possible to improve workability and joint effects. Of course, the name Asphal I Foam can also be used as a casting type only, or as a mold type.

In the background, when the above-mentioned water-based asphalt emulsion, urethane prepolymer base, and polystyrene resin pellets containing the blowing agent are mixed and stirred, the urethane prepolymer undergoes a polymerization reaction to form a polyurethane linkage. At the same time, the free isocyanate groups in the urethane prepolymer react as described below to generate carbon dioxide gas, resulting in a foaming action.

N''' C= O+ H20-+N H2+C02 On the other hand, due to the reaction heat of the =+i4 combination reaction and foaming reaction of the urethane prepolymer, the former 13α foamed All It becomes foamed polystyrene.In this way, a perforated asphalt foam with foamed polystyrene pieces embedded inside is obtained.In addition,) due to insufficient reaction, the juice of the polystyrene resin pellets is generated. You can forcefully heat it using an oven rack. When the water contained in the aqueous asphalt emulsion is insufficient for the foaming action of the urethane prepolymer, a necessary amount of water may be added and mixed. In fact, q, 8: silicone oil as a coating agent can form more uniform AI capsules. water 1d aluminum, clay,
It is needless to say that 7/i≦additives such as fillers such as calcium carbonate, preservatives, rust preventives, anti-corrosion agents, etc. can also be added to the composition.

According to the above-mentioned manufacturing method of the present invention, an asphalt foam is obtained in which pieces of styrene with extremely low specific gravity are embedded inside, and the contribution of these pieces of styrene makes the entire asphalt foam. Q le li
d+4i can be achieved. The styrofoam is relatively cheap! I! Because of the high degree of asphalt foam, according to the invention
1, and it is possible to create an asphalt foam fJ that is particularly suitable as a joint material for concrete and as a base material for construction.

By the way, book-j? 3 Ming is out 4! 1 of the asphalt foam that was proposed earlier by I'i. '! Since it utilizes a waiting method, it is possible to achieve uniform quality and quality (unprecedented durability without causing deterioration) due to uniform dispersion of asphalt particles.

The following ζ uninvented ′ξ/+′l:i 1ull is 1. I'll explain.

Example 1 50% aqueous emulsion of blown asphalt 100
Polyether polyol with 60% ethylene oxide content (molecules -13000,
Urethane prepolymer 60 containing 9.5% free isocyanate obtained by heating and mixing trifunctional) and tolylene diisocyanate, M t? > 25 weight polystyrene pellets containing i+6 and foaming agent @So? Mixed (k
When the mixture was stirred and foamed, an asphalt foam having a density of 0.29 was obtained.

Comparative Example In Example 1, the polystyrene resin pellets were removed and foaming was performed to obtain an asphalt foam with e: W 0.4.

As mentioned above, in the four actual examples, we were able to achieve lighter stitching by over 27% compared to the comparative example.

As described in detail above, the present invention has six advantages, such as being able to produce an asphalt foam with uniform quality and a tight fit.

Claims (4)

[Claims] (1) A urethane polymer obtained by reacting an aqueous asphalt emulsion with a polyether isocyanate having an ethylene oxyleaide content of 15% or more, and a blowing agent. A method for producing light asphalt foam, characterized in that polystyrene fat pellets are mixed with additives and foamed. (2) A method for producing an asphalt foam as described in Patent No. 11, characterized in that forced heating is performed to promote foaming of the polystyrene A resin pellets containing the foam field. (3) A watch characterized in that the water in the stream is combined with the water necessary for the foaming action of the ethylene prepolymer. How to use the lightweight asphalt foam described. (4) Claim (1) characterized in that necessary enhancing agents such as fillers, foam stabilizers, and pigments are added and mixed together.
Section, younger brother L2) 'ffi or younger brother (3) Section 61r/Kai's method for manufacturing lightweight asphalt foam.