TWI738496B - Fireproof insulation material manufacturing method - Google Patents

Abstract

A method for preparing fireproof insulation materials. Firstly, PVC resin, NBR rubber, foaming agent, bridging agent, flame retardant, smoke suppressant and foaming auxiliary agent are uniformly mixed into a foaming raw material, and then the uniformly mixed foaming raw material is firstly mixed. One-time foaming to prepare a foamed crude embryo. The temperature of the first foaming is controlled at 145°C to 160°C, the foaming time is 30-40 minutes, and the expansion ratio is controlled at 12 times that of the original foaming material. Then, the foamed crude embryo is foamed for the second time. The temperature of the second foaming is controlled at 160°C to 170°C, the foaming time is 10 to 20 minutes, and the expansion ratio is controlled at 18 to 25 times that of the original foaming material. , The finished product of the fireproof and thermal insulation material of the present invention can be obtained.

Description

Fireproof insulation material manufacturing method

The present invention is related to a foaming processing method, and particularly refers to a method for preparing a foamed product with excellent heat preservation and temperature insulation effects, and at the same time has the characteristics of fire prevention and non-water absorption.

According to, in recent years, stainless steel pipes have been widely used in building piping and equipment pipe fittings. In order to improve the service function and life, the bare pipe will be covered with a foam material. For example, when used on hot water pipes, through The coating of the foam material can effectively heat insulation to avoid rapid heat dissipation, and can also provide a protective effect on the outside of the pipe, buffer the pipe and the surrounding extrusion, so as to extend the service life of the pipe. In addition, foaming materials are also commonly used in the coating of home separated air-conditioning copper pipes, so that the air-conditioning can be kept cold during the transportation process. However, in actual use, the general foaming materials will be affected by the long-term influence of the sun and rain. It begins to pulverize, resulting in the loss of its insulation and protection.

Generally, the foaming material is based on polymer, and has many pores inside, which reduces its density and obtains the effect of weight reduction. Currently, it is widely used for thermal insulation. The method of preparing foaming materials is mainly to heat the polymer raw materials and use appropriate processing methods to uniformly distribute the gas in the polymer raw materials. After the polymer raw materials are cured, the gas can form pores in the polymer, and according to The distribution of the pores can be further divided into open-cell foam materials and closed-cell foam materials. The open-cell foam materials have better water absorption, air permeability and sound absorption because the pores are connected to the pores. The closed-cell foam material has better heat insulation, specific strength and resilience because the pores and pores are isolated from each other.

Phenolic resin is a common raw material used to make thermal insulation foaming materials. Most of the pores of phenolic foaming materials are closed cells and have the characteristics of honeycomb structure. It has a corrosive effect, so it is usually used in cement partitions or wood insulation layers of building materials, and is not suitable for covering the insulation of building piping or equipment pipe fittings.

In addition, the foamed material made of polystyrene (PS), most of its pores are closed-cell type, which has good water resistance and heat insulation effect, and is widely used in insulation materials, but the foamed polystyrene The processing method of ethylene, whether it is the molding method (EPS) or the extrusion method (XPS), the foaming agent used is a low-boiling solvent, so it has the disadvantage of being flammable. It is used in the fire-resistant (flame-resistant) specifications of household-related items Gradually paid attention to, and now that the standard specifications are constantly improving, its flammable characteristics obviously cannot meet the current standard requirements.

Polyurethane (PU) foaming materials are generally regarded as excellent heat insulation materials, mainly made of isocyanates, polyols, water, catalysts, additives, etc. through the foaming reaction. The material also has thermal insulation properties, and has better strength and hardness. It is widely used in freezer boards and household refrigerators. However, due to its high strength and hardness, it will greatly increase the difficulty of pipe fittings. Therefore, it is not suitable for the coating of pipe insulation.

Another example is the Chinese patent application No. 201710947820, which uses the addition of coal-based solid (fly ash) waste to polyvinyl chloride (PVC) resin to make foamed insulation materials, but most of the pores of the PVC foamed materials are Open-cell type, so the temperature insulation and heat preservation effect is still not ideal, and the structure of the foamed material is easy to tear, which has the problem of not being durable.

In view of this, how to solve the above-mentioned problems is the primary problem to be solved by the present invention.

The main purpose of the present invention is to provide a method for preparing a fireproof thermal insulation material, which has excellent thermal insulation and temperature insulation effects, and at the same time has the effects of fireproofing, non-water absorption, large foaming ratio, low density, light weight and softness.

In order to achieve the foregoing objective, the present invention provides a method for preparing a fireproof and thermal insulation material, which includes: A. Evenly mix PVC resin, NBR rubber, foaming agent, bridging agent, flame retardant, smoke suppressant and foaming auxiliary agent into a foaming raw material. The weight parts of each component of the foaming raw material are: PVC resin 50 parts, 50 parts of NBR rubber, 5 to 15 parts of foaming agent, 1 to 3 parts of bridging agent, 2 to 6 parts of flame retardant, 1 to 5 parts of smoke suppressant, and 1 to 3 parts of foaming aid; B. Place the homogeneously mixed foaming materials in a mold for the first foaming to obtain a foamed crude embryo. The temperature of the first foaming is controlled at 145°C to 160°C, and the foaming time is 30 to 30°C. In 40 minutes, the foaming ratio is controlled at 12 times of the original foaming material; C. Take out the foamed crude embryo after the first foaming, and then place it in another mold for the second foaming. The temperature of the second foaming is controlled at 160°C to 170°C, and the foaming time is 10 to In 20 minutes, the foaming ratio is controlled at 18 to 25 times of the original foaming material to obtain the finished fireproof and thermal insulation material of the present invention.

Preferably, the foaming raw material further contains 5 to 10 parts by weight of a high temperature resistant stabilizer, 2 to 5 parts of an active agent, 1 to 3 parts of a crosslinking agent and 0.1 to 0.3 parts of an accelerator.

It is not difficult to obtain an in-depth understanding of the above-mentioned objects and advantages of the present invention from the detailed description of the selected embodiments and the accompanying drawings.

First of all, please refer to Figures 1 to 5, which is a method for preparing fireproof and thermal insulation materials provided by the present invention, which mainly includes the following steps:

A. Preparation of foaming raw materials: uniformly mix PVC (polyvinyl chloride) resin, NBR rubber (Nitrile Butadiene Rubber), foaming agent, bridging agent, flame retardant, smoke suppressant and foaming aids into one Foam raw material, the weight parts of each composition of the foam raw material are as follows: 50 parts of PVC resin; 50 parts of NBR rubber; 5 to 15 parts of foaming agent; 1 to 3 parts of bridging agent; 2 to 6 parts of flame retardant; 1 to 5 parts of smoke suppressant; 1 to 3 parts of foaming aid. And preferably, 5 to 10 parts by weight of high temperature resistant stabilizer, 2 to 5 parts of active agent, 1 to 3 parts of auxiliary crosslinking agent and 0.1 to 0.3 parts by weight can be added to the foaming raw material. Accelerator. Among them, PVC (polyvinyl chloride) resin has the characteristics of low cost, good thermal insulation, and B1 flame retardant (self-extinguishing from fire) and stable properties; NBR rubber (Nitrile Butadiene Rubber,) is a synthetic rubber, Copolymer polymerized by acrylonitrile and butadiene monomer, excellent oil resistance (especially alkane oil), high abrasion resistance, good air tightness, good heat resistance, strong adhesion and aging resistance Advantages such as better performance. The foaming agent can be the foaming agent of Thorpe’s model AC6000, the bridging agent can be the bridging agent of Hunan Yixiang model BIPB; the flame retardant can be an environmentally friendly composite phosphorus-nitrogen flame retardant; the smoke suppressant can be molybdenum Any one or a combination of ammonium acid, molybdenum oxide, ferrocene, iron oxide, and copper oxide; the foaming aid adopts Thorpe’s model CX-A foaming aid; the high temperature resistant stabilizer can adopt active Magnesium oxide; zinc oxide can be used as the active agent; crosslinking aid can be used as the crosslinking aid of Guizhou Zunyi Model Double 25; and the accelerator can be used as the promoter of Aoze Silicon Fluorine Model TXB Platinum PL-50. And according to the formula weight parts of the above components, PVC resin, NBR rubber, foaming agent, bridging agent, flame retardant, smoke suppressant, foaming aid, high temperature stabilizer, active agent, crosslinking aid And the accelerator are put into an internal mixer and mixed evenly to prepare the foaming raw materials required for the subsequent foaming operation.

B. Then place the homogeneously mixed foaming materials in a mold for the first foaming to prepare a foamed crude embryo. The temperature of the first foaming is controlled at 145°C to 160°C, and the foaming time is 30°C. To 40 minutes, the foaming ratio is controlled at 12 times of the original foaming material.

C. Take out the foamed crude embryo after the first foaming, and then place it in another mold for the second foaming. The temperature of the second foaming is controlled at 160°C to 170°C, and the foaming time is 10 to In 20 minutes, the foaming ratio is controlled at 18 to 25 times that of the original foaming material to obtain the finished product of the fireproof insulation material of the present invention. Finally, after the foamed product is naturally cooled, the foamed product can be stored in the warehouse or proceed to follow-up. Cutting processing.

The fireproof insulation material prepared by the above-mentioned manufacturing method of the present invention, through the addition of NBR rubber to the PVC resin, makes the PVC resin in the foaming process, and the NBR rubber itself has good air tightness, good heat resistance, and adhesion. The characteristics of strong strength and good aging resistance are complementary, so that most of the foamed foam products of the present invention can be closed-cell type, have excellent waterproof performance, and can improve their heat preservation and temperature insulation effects, and further With the two foaming process, the foaming ratio can be fully increased, and the thermal shrinkage rate is very small at high temperature, which can achieve the characteristics of large foaming ratio, small density, light weight and softness, which can be beneficial to building piping or equipment The coating operation of pipe insulation is further improved by adding flame retardant and smoke suppressant to greatly improve its fire performance, and it can indeed meet the increasingly stringent fire protection standards.

Next, referring to Figure 2 in conjunction with the present invention, the fireproof and thermal insulation material made by the above-mentioned manufacturing method is compared with the foamed material made of conventional PE (polyethylene). It can be further seen that the present invention is through The fireproof and thermal insulation material produced by the above-mentioned manufacturing method can not only show closed-cell pores on the cut surface, but also dense and small pores, which increases the structure of the separation wall connecting the bubbles with the bubbles, and can greatly improve its thermal insulation and temperature insulation. Effect.

However, the disclosure of the above embodiments is only used to illustrate the present invention, and not to limit the present invention. Therefore, any change in numerical values or replacement of equivalent elements should still belong to the scope of the present invention.

In summary, when it is possible for those who are familiar with this technique to understand that this invention can clearly achieve the aforementioned purpose, it has actually complied with the provisions of the Patent Law, so they file an application in accordance with the law.

(without)

Figure 1 is a schematic diagram of the manufacturing process of the present invention. Figure 2 is a schematic diagram of the cross-sectional comparison between the finished product of the fireproof insulation material of the present invention and the finished product of the conventional PE foam material.

Claims (2)

A method for preparing fireproof insulation materials, the steps include: A. uniformly mixing PVC resin, NBR rubber, foaming agent, bridging agent, flame retardant, smoke suppressant and foaming auxiliary agent into a foaming raw material, the foaming raw material The parts by weight of each composition are: 50 parts of PVC resin, 50 parts of NBR rubber, 5 to 15 parts of foaming agent, 1 to 3 parts of bridging agent, 2 to 6 parts of flame retardant, 1 to 5 parts of smoke suppressant, and 1 to 3 parts of foaming aid; B. Place the homogeneously mixed foaming materials in a mold for the first foaming to prepare a foamed crude embryo. The temperature of the first foaming is controlled at 145℃ To 160℃, the foaming time is 30-40 minutes, and the foaming ratio is controlled at 12 times of the original foaming material; C. Take out the foamed crude embryo after the first foaming, and then place it in another mold for the second time. For secondary foaming, the temperature of the second foaming is controlled at 160°C to 170°C, the foaming time is 10 to 20 minutes, and the expansion ratio is controlled at 18 to 25 times that of the original foaming material to prepare the fireproof and thermal insulation of the present invention The finished product, and the cut surface of the finished product shows pores in the form of closed cells. The method for preparing a fireproof insulation material according to claim 1, wherein the foaming raw material further contains 5 to 10 parts by weight of a high-temperature resistant stabilizer, 2 to 5 parts of an active agent, and 1 to 3 parts of a crosslinking aid And 0.1 to 0.3 parts of accelerator.

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