阅读说明：本技术 一种绝热保温轻集料及其制备方法 (Heat-insulating light aggregate and preparation method thereof ) 是由 栾玉成 秦军 周涛 于 2020-05-27 设计创作，主要内容包括：一种绝热保温轻集料,由介孔材料、填料等组分组成。本发明制备的介孔轻集料堆积密度在150-700kg/m<Sup>3</Sup>、导热系数最低可达0.030W/(m.k)、筒压强度最高可达8MPa,相比与传统的轻集料,同类别中具有更优异的保温隔热效果和更高的强度,可广泛应用于保温砂浆、保温板材、自保温混凝土等领域,具有非常可观的应用前景。(A heat-insulating light aggregate is composed of mesoporous material and filler. The bulk density of the mesoporous light aggregate prepared by the invention is 150-700kg/m 3 The thermal conductivity coefficient can reach 0.030W/(m.k) at the lowest, the barrel pressure strength can reach 8MPa at the highest, compared with the traditional light aggregate, the composite material has more excellent heat preservation and insulation effects and higher strength in the same category, can be widely applied to the fields of heat preservation mortar, heat preservation plates, self-insulation concrete and the like, and has very considerable application prospect.)

1. The heat-insulation light aggregate is characterized by comprising the following components in parts by weight:

10-100 parts of mesoporous material

0.01-90% of filler

2. A heat insulating lightweight aggregate according to claim 1, wherein said filler is at least one of clay, bentonite, attapulgite, silica fume, sepiolite powder and halloysite.

3. The heat insulating lightweight aggregate according to claim 1, wherein the mesoporous material is ordered mesoporous material, silicon-based and non-silicon-based ordered mesoporous material.

4. The heat insulation lightweight aggregate according to claim 1, wherein the mesoporous material and the filler are powder.

5. The preparation method of the heat-insulating light aggregate is characterized by comprising the following steps:

(1) uniformly mixing the powder mesoporous material with one or more powder fillers;

(2) putting the mixed powder material into a double-roller granulator for tabletting;

(3) crushing and screening the tabletted materials into particles with different sizes;

(4) and carrying out surface treatment modification on the particles.

Technical Field

The invention belongs to the field of materials, and particularly relates to a heat-insulating light aggregate and a preparation method thereof.

Background

The light aggregate is also called lightweight aggregate, generally refers to porous aggregate with loose volume weight less than 1000kg/m3, and is mainly used for preparing light aggregate concrete, thermal insulation mortar, heat insulation refractory castable and the like. The light aggregate is divided into the following raw materials according to the raw material sources: (1) natural lightweight aggregates such as pumice, scoria, porous tuff, and the like; (2) artificial light aggregate, such as ceramsite, expanded perlite, expanded vermiculite, zeolite light aggregate, etc. The light aggregate has wide application in the fields of construction, heat insulation, fire resistance and the like. However, the traditional lightweight aggregates have certain defects, and the commonly used vitrified micro bubbles, expanded perlite, expanded vermiculite and the like have relatively low heat conductivity coefficients, but low cylinder pressure strength; the ceramsite cylinder has high compressive strength, but also has high heat conductivity coefficient and poor heat insulation performance. With the development of society, the traditional lightweight aggregate can not meet the requirements of people more and more, and a novel lightweight aggregate which not only has lower heat conductivity coefficient but also has higher strength is urgently needed.

Disclosure of Invention

Aiming at the problems of the existing aggregate, the invention mainly solves the technical problem of obtaining higher particle strength on the premise of keeping lower heat conductivity coefficient. For example, on the premise that the heat conductivity coefficient of the mesoporous lightweight aggregate is the same as or slightly lower than that of the traditional lightweight aggregate, the cylinder pressure strength is obviously higher than that of the traditional lightweight aggregate; or on the premise that the strength of the mesoporous lightweight aggregate is the same as that of the traditional lightweight aggregate, the heat conductivity coefficient is obviously lower than that of the traditional lightweight aggregate.

A heat insulation lightweight aggregate comprises the following components in parts by weight:

10-100 parts of mesoporous material

0.01-90% of filler

Wherein the filler is at least one of clay, bentonite, attapulgite, silica fume, sepiolite powder and halloysite.

The mesoporous material is ordered mesoporous material, silicon-based and non-silicon-based ordered mesoporous material.

The mesoporous material and the filler are both powder.

The invention has no optimal proportion, such as less mesoporous materials, more fillers, higher bulk density, slightly higher heat conductivity coefficient (namely slightly poor heat preservation and insulation effect), but high strength; and on the contrary, the composite material has low thermal conductivity, low bulk density and slightly poor strength, can be applied to different occasions, but has better comprehensive performance compared with the traditional materials of the same class. After granulation by roll extrusion, a surface treatment (e.g., hydrophobic treatment) is performed.

A preparation method of heat-insulating lightweight aggregate comprises the following steps:

(1) uniformly mixing the powder mesoporous material with one or more powder fillers;

(2) putting the mixed powder material into a double-roller granulator for tabletting;

(3) crushing and screening the tabletted materials into particles with different sizes;

(4) and carrying out surface treatment modification on the particles.

According to the actual working condition requirement, the composite powder material can be tabletted once or repeatedly by adopting a double-roller granulator to perform the tabletting process so as to obtain higher particle strength.

The light aggregate can realize internal humidity regulation and control and reduce the self-shrinkage of concrete due to the structural characteristics of the light aggregate, and can reduce the thermal expansion coefficient of the concrete, thereby being beneficial to improving the cracking problem of the solid structure caused by temperature shrinkage and self-shrinkage in the early construction period.

The bulk density of the mesoporous light aggregate prepared by the invention is 150-700kg/m³The thermal conductivity coefficient can reach 0.030W/(m.k) at the lowest, the barrel pressure strength can reach 8MPa at the highest, compared with the traditional light aggregate, the composite material has more excellent heat preservation and insulation effects and higher strength in the same category, can be widely applied to the fields of heat preservation mortar, heat preservation plates, self-insulation concrete and the like, and has very considerable application prospect.

Such as 150-300kg/m³The particles can be applied to the preparation of inorganic heat-insulating mortar and heat-insulating plates, and can replace some applications of the traditional vitrified micro bubbles, expanded perlite and expanded vermiculite; 300-700kg/m³The particles can be applied to occasions requiring certain strength for materials, such as self-insulation concrete, floor heat preservation and the like.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION