阅读说明：本技术 一种阻燃疏水喷胶棉的制备方法 (Preparation method of flame-retardant hydrophobic spray-bonded cotton ) 是由 崔大祥 陈超 王敬锋 林琳 金彩虹 于 2019-12-02 设计创作，主要内容包括：本发明公开了一种阻燃疏水喷胶棉的制备方法,以提高气相空隙率,降低导热系数和传导系数为研发导向,为了兼顾使用现场的防火和防水、防潮要求,本发明在普通喷胶棉的工艺基础上进行了大幅度的改动,选用阻燃的聚丙烯中空纤维作为胶棉,黏合剂中加入了珍珠岩、蛭石和空心微珠等传统防火隔热材料并加以疏水改性,纳米氧化锌还起到了抗菌防霉的作用,且在黏合剂乳化聚合的过程中粉体直接参与单体反应,在成品黏合剂乳液中得到充分良好的分散,有利于喷胶棉性能的均一性。(The invention discloses a preparation method of flame-retardant hydrophobic spray bonded cotton, which aims to improve gas phase void ratio and reduce heat conductivity and conductivity as research and development guide, and in order to meet the requirements of fire prevention, water prevention and moisture prevention of a use site.)

1. A preparation method of flame-retardant hydrophobic spray bonded cotton is characterized by comprising the following steps:

weighing zinc oxide, perlite, vermiculite and glass beads, mixing according to a ratio of (5-20) to (50: 50: 100), adding into water, modifying by using a coupling agent, dispersing and modifying by using high-speed shearing equipment at a modification temperature of 60-80 ℃ for 2-8 hours, finally spray-drying, slightly crushing, and sieving by using a 120-mesh sieve to obtain hydrophobic powder;

adding a certain amount of hydrophobic powder into a mixed monomer (methyl methacrylate, styrene and ethyl acrylate) for high-speed shearing and dispersion, slowly adding the obtained dispersion into the dispersion of water and an emulsifier for continuous high-speed shearing and emulsification, then adding an initiator, a cross-linking agent and other auxiliaries for emulsion polymerization, wherein the polymerization temperature is less than or equal to 80 ℃, the high-speed shearing helps the polymerization and dispersion, and sieving the mixture through a 100-mesh sieve after the reaction is finished to obtain a composite adhesive emulsion, wherein the proportion of the hydrophobic powder in the dry weight of the composite adhesive is 1-5%;

and (3) spraying glue on the polypropylene non-glue cotton laid into the net by using the composite adhesive, and then baking and forming to obtain a finished product of the flame-retardant hydrophobic glue-sprayed cotton.

2. The method for preparing the flame-retardant hydrophobic spray-bonded cotton according to claim 1, wherein the zinc oxide is nano zinc oxide, the perlite is expanded perlite, the vermiculite is expanded vermiculite, and the glass beads are hollow beads.

3. The method for preparing the flame-retardant hydrophobic spray-bonded cotton according to claim 1, wherein the polypropylene cotton is hollow fiber, and a flame retardant is added into the spinning raw material to realize the flame-retardant function of the fiber.

4. The method for preparing the flame-retardant hydrophobic spray bonded cotton according to claim 1, wherein the coupling agent is silane coupling agent KH-550.

5. The method of claim 1, wherein the initiator is ammonium persulfate, the dispersant is tween 80, and the cross-linking agent is N-methylol acrylamide.

6. The method for preparing hydrophobic spray-bonded cotton wool with flame retardance as claimed in claim 1, wherein the emulsifier used is a mixture of tween 80 and sodium dodecyl sulfate.

7. The preparation method of the flame-retardant hydrophobic spray bonded cotton according to any one of claims 1 to 6, wherein 5g of zinc oxide, 50g of perlite, 50g of vermiculite and 100g of glass beads are weighed, mixed and then put into water, 4.1g of coupling agent KH-550 is added, the mixture is dispersed and modified by high-speed shearing equipment, the modification temperature is 80 ℃, the modification time is 2 hours, finally, the mixture is subjected to spray drying, slightly crushed and sieved by a 150-mesh sieve to obtain hydrophobic powder;

adding 100g of hydrophobic powder into 9000g of mixed solution of methyl methacrylate, styrene and ethyl acrylate, carrying out high-speed shearing dispersion, slowly adding the obtained dispersion into 18kg of water and 270g of emulsifier (a dispersion of a mixture of Tween 80 and sodium dodecyl sulfate, carrying out high-speed shearing emulsification, then adding 45g of ammonium persulfate and 135g of N-hydroxymethyl acrylamide, carrying out emulsion polymerization at the polymerization temperature of 80 ℃, simultaneously carrying out high-speed shearing to assist polymerization and dispersion, sieving by a sieve of 100 meshes after the reaction is finished to obtain a composite adhesive emulsion, drying and weighing part of the emulsion, and measuring and calculating to obtain the hydrophobic powder with the dry weight ratio of 1.2%;

and spraying glue on the polypropylene non-glue cotton which is laid into a net by using the composite adhesive, and then baking and forming to obtain a finished product of the flame-retardant hydrophobic sprayed glue cotton.

8. The method for preparing the flame-retardant hydrophobic spray bonded cotton according to any one of claims 1 to 6, wherein:

weighing 12g of zinc oxide, 50g of perlite, 50g of vermiculite and 100g of glass beads, mixing, putting into water, adding 4.24g of coupling agent KH-550, performing dispersion modification on the mixture by using high-speed shearing equipment, performing modification at the modification temperature of 72 ℃ for 4 hours, finally performing spray drying, slightly crushing, and sieving by using a 150-mesh sieve to obtain hydrophobic powder;

adding 100g of hydrophobic powder into a mixed solution of 4500g of methyl methacrylate, styrene and ethyl acrylate, shearing and dispersing at a high speed, slowly adding the obtained dispersion into a dispersion of 9000g of water and 180g of an emulsifier, continuously shearing and emulsifying at a high speed, then adding 31.5g of ammonium persulfate and 90g of N-hydroxymethyl acrylamide, carrying out emulsion polymerization at the polymerization temperature of 77 ℃, simultaneously shearing at a high speed to help polymerization and dispersion, sieving by a 100-mesh sieve after the reaction is finished to obtain a composite adhesive emulsion, drying and weighing part of the emulsion, and calculating to obtain the hydrophobic powder with the dry weight ratio of 2.5%;

and spraying glue on the polypropylene non-glue cotton which is laid into a net by using the composite adhesive, and then baking and forming to obtain a finished product of the flame-retardant hydrophobic sprayed glue cotton.

9. The method for preparing the flame-retardant hydrophobic spray bonded cotton according to any one of claims 1 to 6, wherein:

weighing 18g of zinc oxide, 50g of perlite, 50g of vermiculite and 100g of glass beads, mixing, adding into water, adding 4.36gKH-550, dispersing and modifying by using high-speed shearing equipment at the modification temperature of 63 ℃ for 7 hours, finally spray drying, slightly crushing, and sieving by using a 150-mesh sieve to obtain hydrophobic powder;

adding 100g of hydrophobic powder into a mixed solution of 3000g of methyl methacrylate, styrene and ethyl acrylate, shearing and dispersing at a high speed, slowly adding the obtained dispersion into a dispersion of 6000g of water and 120g of an emulsifier, continuously shearing and emulsifying at a high speed, then adding 24g of ammonium persulfate and 90g of N-hydroxymethyl acrylamide, carrying out emulsion polymerization at a polymerization temperature of 75 ℃, simultaneously shearing at a high speed to help polymerization and dispersion, sieving by a 100-mesh sieve after the reaction is finished to obtain a composite adhesive emulsion, drying and weighing part of the emulsion, and calculating to obtain the dry weight of the hydrophobic powder accounting for 3.9%;

and spraying glue on the polypropylene non-glue cotton which is laid into a net by using the composite adhesive, and then baking and forming to obtain a finished product of the flame-retardant hydrophobic sprayed glue cotton.

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a preparation method of flame-retardant hydrophobic spray-bonded cotton.

Background

In recent years, the interest of the whole society on energy-saving and environment-friendly buildings is continuously increased, and building heat insulation materials are also receiving more and more attention. The traditional heat-insulating material is mainly used for improving gas phase void ratio and reducing heat conductivity coefficient and conduction coefficient. The fiber heat-insulating material needs a thicker coating layer to increase the convective heat transfer and the radiant heat transfer in the use environment; the section inorganic heat-insulating material needs to be assembled and constructed, and has the defects of more seams, attractive appearance, poor waterproofness, short service life and the like. Therefore, a new material capable of greatly improving the heat preservation and insulation performance is continuously sought and researched.

The production method of the glue-spraying cotton is that the adhesive is uniformly sprayed on the surface of a certain amount of fiber web, and the fiber web has certain strength after being dried. The glue-sprayed cotton is sprayed with adhesive and is not soaked, and after spraying, it is no longer pressed by pressure and solidified. Therefore, in the bonded state of the fibers, the cross-point contact is more, and the adhesive bridges less clumps, which is the main reason why the cotton wool can keep loose, soft and warm. The purpose of flame retardation and heat preservation can be achieved as long as the functional powder can be uniformly and stably dispersed in the adhesive emulsion and attached to the surface of the fiber web along with the adhesive. Meanwhile, along with the increase of the production area of Chinese sunlight greenhouse facilities, the heat-insulating covering material is changed and improved for many times, wherein the heat insulation at night of the traditional sunlight greenhouse is mainly realized by covering a straw mat, a paper quilt, a cotton quilt, a felt and the like, but the defects of the straw mat and the paper quilt are increasingly prominent, in addition, the heat insulation performance of the needled felt after long-term use is lost due to the fact that the interior of the needled felt is affected with damp. The heat-insulating covering material also needs to meet the requirements of intensive and large-scale greenhouse development, and the development of a hydrophobic function is suitable for internal and external heat-insulating covering required by greenhouse development in China.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a preparation method of flame-retardant hydrophobic spray bonded cotton, which realizes the flame-retardant hydrophobic effect of the spray bonded cotton by modifying a formula and a process.

The purpose of the invention is realized by the following scheme: a preparation method of flame-retardant hydrophobic spray bonded cotton comprises the following steps:

weighing zinc oxide, perlite, vermiculite and glass beads, mixing the zinc oxide, the perlite, the vermiculite and the glass beads in a ratio of 5-20: 50:50:100, adding the mixture into water, adding a certain amount of coupling agent, dispersing and modifying the mixture by using high-speed shearing equipment, wherein the modification temperature is 60-80 ℃, the modification time is 2-8 hours, finally performing spray drying, slightly crushing, and sieving by using a 120-mesh sieve to obtain hydrophobic powder; adding a certain amount of hydrophobic powder into mixed monomers (methyl methacrylate, styrene and ethyl acrylate) for high-speed shearing and dispersion, slowly adding the obtained dispersion into the dispersion of water and an emulsifier for continuous high-speed shearing and emulsification, then adding an initiator, a dispersant, a cross-linking agent and other auxiliaries for emulsion polymerization, wherein the polymerization temperature is less than or equal to 80 ℃, simultaneously carrying out high-speed shearing to help polymerization and dispersion, and sieving by a 100-mesh sieve after the reaction is finished to obtain a composite adhesive emulsion; and spraying glue on the polypropylene non-glue cotton which is laid into a net by using the composite adhesive, and then baking and forming to obtain a finished product of the flame-retardant hydrophobic sprayed glue cotton.

The zinc oxide is nano zinc oxide, the perlite is expanded perlite, the vermiculite is expanded vermiculite, and the glass beads are hollow beads.

The proportion of the hydrophobic powder in the dry weight of the composite adhesive is 1-5%.

The polypropylene cotton is hollow fiber, and flame retardant is added into the spinning raw material to realize the flame retardant function of the fiber.

The coupling agent is silane coupling agent KH-550.

The initiator is ammonium persulfate, the dispersant is Tween 80, and the cross-linking agent is N-hydroxymethyl acrylamide.

The emulsifier is a mixture of tween 80 and sodium dodecyl sulfate.

The invention discloses a preparation method of flame-retardant hydrophobic spray bonded cotton, which aims to improve gas phase void ratio and reduce heat conductivity and conductivity as research and development guide, and in order to meet the requirements of fire prevention, water prevention and moisture prevention of a use site.

Detailed Description

The present invention is described in detail by the following specific examples, but the scope of the present invention is not limited to these examples.