阅读说明：本技术 一种固相硅凝胶sg泡沫材料的改性方法 (Modification method of solid-phase silica gel SG foam material ) 是由 胡涛 朱瑞 胡兴元 于 2021-10-26 设计创作，主要内容包括：本发明公开了一种硅凝胶SG泡沫材料的改性方法。由高含氢硅油与甲醇与渗透剂复配的改性液,经喷涂至固相硅凝胶SG泡沫材料上,经过静置,SG泡沫材料充分吸收改性液,并完成部分反应,之后再经高温完全反应。经上述改性的SG泡沫裸板由冻融循环5次以上,提升到50次以上。(The invention discloses a modification method of a silica gel SG foam material. The modified liquid compounded by the high hydrogen-containing silicone oil, the methanol and the penetrating agent is sprayed on the solid-phase silica gel SG foam material, the SG foam material fully absorbs the modified liquid after standing, partial reaction is completed, and then the high-temperature complete reaction is carried out. The modified SG foam bare board is improved to more than 50 times by freeze-thaw cycle for more than 5 times.)

1. A modification method of solid-phase silicone gel SG foam material is characterized in that 1mol of hydrogen-containing silicone oil, 2-5 mol of methanol and 0.1-0.9 wt% of penetrant are uniformly mixed to prepare modification liquid, the modification liquid is coated, sprayed, cleaned and soaked in the solid-phase silicone gel SG foam material to be modified, the suction amount of the modification liquid is 1.5-7.5 wt% of the mass of the foam material, the standing time is not less than 6h, the SG foam material after the standing is placed in a high-temperature environment of 130-260 ℃ for not less than 20min, and the SG foam material is naturally cooled to complete modification; the hydrogen-containing silicone oil can also be high hydrogen-containing silicone oil, polyhydrogen silicone oil, or a mixture of more than two of the above silicone oils; the methanol is industrial pure methanol; the penetrating agent is one of CF and quick T, LS15, or the mixture of two or more; the standing is performed in an outdoor environment or an indoor environment; the high temperature is provided by far infrared or near infrared light wave radiation or hot air.

Technical Field

Belongs to the field of inorganic silicon oxide and silicate materials. And (3) material surface modification technology.

Background

Chinese patent CN104174341A "A preparation method of solid-phase silica gel" discloses a solid-phase silica gel prepared from quartz sand, which explains that the solid-phase silica gel is a complex synthesized by manpower, the normal temperature environment is a stable solid-phase object, when the temperature is higher than 108 ℃, the solid-phase to liquid-phase transfer is started, and the special physical and chemical properties and the processability of the material are established due to the wide critical interval. Chinese patent CN112934133A, a preparation method of modified solid-phase silica gel, discloses a preparation method of modified solid-phase silica gel, which uses calcium-neutralized trichlorosilane solid waste as partial raw material to replace quartz sand, reduces raw material cost, simplifies formula and prepares modified solid-phase silica gel. The method comprises the following steps: simplified formulation, mild reaction and easy control. The solid phase silica gel product prepared by the method has the product characteristics of obviously improved water resistance. Chinese patent CN104177115A, a method for preparing foam material from solid-phase silica gel, discloses that solid-phase silica gel is softened by infrared irradiation under the action of nucleating agent, foam stabilizer, surfactant, foaming agent, etc., foamed by microwave irradiation, and cured at high temperature to obtain solid-phase silica gel foam material.

Disclosure of Invention

The technical scheme aims to effectively improve the times of freeze-thaw resistance cycle of the SG foam material and achieve the goal that the SG foam bare board is subjected to cyclic freeze-thaw for more than 50 times. The inventor selects hydrogen-containing silicone oil and methanol as the modifying liquid and researches the reaction mechanism and the reaction condition of the hydrogen-containing silicone oil and the methanol. The catalytic property of the alkaline environment on the reaction of hydrogen-containing silicone oil and methanol is researched, and the adhesive property of the SG foam wall and a reaction product and the influence of the SG foam wall on the cold and hot environments are researched. The reaction of ethanol, propanol, isopropanol with hydrogen-containing silicone oil was investigated, with methanol being preferred. The reaction differences of the polyhydrogen silicone oil, the hydrogen-containing silicone oil and the high-hydrogen-containing silicone oil are tested, and a mixing ratio with a proper reaction speed is preferably obtained by blending 1mol of the hydrogen-containing silicone oil and 2-5 mol of methanol. A plurality of penetrants, preferably CF and fast T, LS15 penetrants, are tried, the mass ratio of the penetrants in the modified liquid is preferably 0.1-0.9%, which belongs to an optimized parameter, and the modified liquid is prepared by simple equipment. A method for penetrating the solid-phase silica gel SG foam material to be modified by brushing, spraying, cleaning and soaking technology is tried, and a proper method can be selected according to the shape of the material and the preparation of a workshop, wherein the main point is the absorption amount of the modifying solution. And obtaining a relevant conclusion that the suction amount of the modified liquid is guaranteed and the circulating freeze-thaw resistance of the product can be guaranteed. The ratio of the absorption amount of the modifying liquid in the mass of the foam material is preferably 1.5-7.5%. Preferably, the permeation and reaction time is more than or equal to 6 hours of standing. And the SG foam material after standing is subjected to a complete reaction for more than or equal to 20min in a high-temperature environment of between 130 and 260 ℃. The far infrared, near infrared and hot air are tried to provide heat sources, and the associated conclusion that the method can effectively guarantee the product quality under the premise of guaranteeing the high-temperature environment of 130-260 ℃ for more than or equal to 20min is obtained. And naturally cooling the SG foam material to finish modification. The SG foam material modified by the later process is obtained, the circulating freeze-thaw resistance times of the SG foam material are greatly improved, and the SG foam bare board is detected by circulating freeze-thaw for more than 50 times.

Detailed description of the preferred embodiment 1

Now, taking actual production as an example, the following is elaborated in detail: modification method of solid-phase silica gel SG foam material

Raw materials: SG3.0 foam board 1m³The mass is 110Kg, the foam opening rate is more than or equal to 86 percent, the high hydrogen silicone oil is 3Kg, the methanol is 3.8Kg, LS 1520 g, CF10g and quick T10 g

Preparing a modified solution: adding the weighed high hydrogen-containing silicone oil, methanol, CF, LS15 and sodium chloride into a 5L emulsifying machine, stirring, stopping stirring after 10min, and introducing the mixed solution into a liquid tank of a spraying box for later use

SG foam modification: placing SG foam plates in a spraying box, 1 block at a time, starting an air compressor, closing a box door, starting a spray gun, spraying 10s each block, stopping 10s each block, filtering and refluxing a modified liquid, putting the modified liquid into a spraying box liquid tank, weighing the residual materials in the spraying box liquid tank after the spraying operation is completed, keeping the residual materials at 260g, stacking and standing the sprayed SG foam plates for 12 hours, putting the standing SG foam plates into a near-infrared drying production line, setting a high-temperature section at 260 ℃, setting an inlet section at 160 ℃, setting a tail section at 130 ℃, and beginning to flow out the modified SG foam plates after 30 min. Fourthly, the SG foam material is modified after natural cooling.