High-weather-resistance rock wool product for external thermal insulation of building exterior wall and preparation method of high-weather-resistance rock wool product

A technology of building exterior walls and high weather resistance, applied in thermal insulation, building components, etc., can solve problems such as limited use, no reflection, and difficulty in achieving satisfactory results

Active Publication Date: 2022-04-12
潍坊三禄经贸有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still compatibility and compatibility problems between dust-proof oil and low-order phenolic resin and water repellent, which limits the application of dust-proof oil
[0010] The outer diameter of the droplets formed when the adhesive aqueous solution is sprayed is generally on the micron scale, so after spraying, the low-order phenolic resin, water-repellent agent and optional dust-proof oil on the rock wool fiber are not uniform, and the viscosity and surface diffusion of each component The difference in speed leads to uneven distribution of the low-order phenolic resin, water repellent and optional dustproof oil on the surface of the rock wool fiber after heat curing, which makes the moisture absorption and water resistance of the rock wool board obtained The performance is not consistent, and it is not easy to reach a satisfactory level, so it is not easy to obtain rock wool boards and rock wool strip products with high weather resistance, which reduces their long-term use value as external wall insulation materials
The use of modified low-order phenolic resin can improve the above defects to a certain extent, but it will increase the cost of the adhesive, and it is not easy to be accepted by rock wool board manufacturers, thus limiting its use.
[0011] Weather resistance is the main durability performance index of rock wool products, but it is not reflected in the national standard GB / T 25975-2018 main index requirements and test methods of rock wool products for external insulation of building exterior walls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Prepare thermosetting phenolic resin A according to the following method: use a 100L stirred reactor with a condenser and vacuum distillation, the distillate gas during vacuum distillation is first condensed by the condenser, the condensate enters the liquid storage tank, and the condenser is connected in series Wash the bottle to detect the condensation effect; pump the reactor to an absolute pressure of 20kPa, fill it with 99.9% nitrogen to 300 kPa, repeat the evacuation and nitrogen filling operation 3 times to test the density and replace the air; while continuously stirring, add water in sequence 8kg, 1.0kg of acetic acid aqueous solution with concentration of 40m%, 15kg of aqueous solution of formaldehyde with concentration of 37m%, and 10kg of phenol. Close the reactor and heat immediately. After 40 minutes, the temperature of the feed liquid is raised to 65°C, and the temperature is raised to 85°C after stirring for 20 minutes and maintained at 85-90°C. React unde...

Embodiment 2

[0045] The condensate (15.0kg, containing 1.0m% formaldehyde, 2.8m% phenol, and 2.6m% acetic acid) collected during vacuum distillation in Example 1 was subjected to secondary vacuum distillation through a set of 25L vacuum distillation device, and the condensate Before adding, it is also evacuated to an absolute pressure of 20kPa, filled with 99.9% nitrogen to 300 kPa, and repeated the evacuation and nitrogen filling operations for 3 times to test the density and replace the air; the conditions for the second vacuum distillation include: the temperature of the condensate is 50°C , pumping vacuum degree absolute pressure 12kPa, condensation temperature 25 ℃, time 60min. Condensation collected 8.9kg of recovered concentrate, which contained 1.6m% formaldehyde, 4.7m% phenol, and 4.3m% acetic acid; 6.0kg of remaining water in the distillation tank after the vacuum distillation was completed, and the total organic components were measured to be ≤0.3m%. The automatic valve at the i...

Embodiment 3

[0049] Basically repeat the method of Example 1 to prepare heat-curable phenolic resin C, the difference is that the water in the feed is changed to 7kg, the amount of 40m% acetic acid aqueous solution is changed to 2kg, and the formaldehyde aqueous solution with a concentration of 37m% is changed to 16kg.

[0050] Results During the operation, the resin concentration before vacuum distillation was detected to be 32.6m%, the residual formaldehyde concentration was 0.52m%, and the residual phenol concentration was 1.0m%. The resin quality was stable for about 3 months. Distilled under reduced pressure and cooled the obtained heat-cured phenolic resin A with a solid content concentration of 44.5m%, residual formaldehyde 0.004m%, residual phenol 0.009m%, acetic acid 0.005m%, resin viscosity 1360mPa.s, average molecular weight 1100, quality stability period ≥ 6 months. 14.9kg of condensate collected during vacuum distillation contained 1.2m% formaldehyde, 2.3m% phenol, and 5.3m% a...

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Abstract

The invention provides a high-weather-resistance rock wool product for external thermal insulation of a building external wall and a preparation method of the high-weather-resistance rock wool product. The high-weather-resistance rock wool product is prepared by spraying a composite adhesive aqueous solution on rock wool fibers, the composite adhesive aqueous solution comprises phenolic resin which can be polymerized and cured at 180-250 DEG C, and sodium methyl silicate and / or potassium methyl silicate; on the basis of the dry weight of the rock wool product, 0.8-1.2% of phenolic resin solids and 0.08-0.15% of sodium methyl silicate and / or potassium methyl silicate are coated; according to the prepared rock wool board, the rock wool fibers are stable in strength and water and moisture absorption capacity, the water and moisture absorption capacity is low, the index requirements of GB / T 25975-2018 are met, and the long-term performance, especially the weather resistance, of the rock wool board is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials for building exterior walls, and in particular relates to a highly weather-resistant rock wool product for external thermal insulation of building exterior walls and a preparation method thereof. Background technique [0002] In most parts of my country, there are significant seasonal temperature changes and temperature differences between day and night. In order to ensure suitable and stable indoor temperature conditions, reduce energy consumption and cost of temperature control, long-term thermal insulation materials are installed on the exterior walls of many houses, especially rock wool boards and rock wool strips with better fire resistance. The main insulation material. At the same time, because the absolute humidity and relative humidity of the air inside and outside the exterior wall often have significant and regular changes, the exterior wall materials will also abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/12C03C25/14C03C25/34E04B1/76
CPCY02A30/244
Inventor 赵娟
Owner 潍坊三禄经贸有限公司
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