阅读说明：本技术 一种防潮缓冲材料的制备方法 (preparation method of damp-proof buffer material ) 是由 马少婷 于 2019-08-06 设计创作，主要内容包括：本发明具体涉及一种防潮缓冲材料的制备方法,属于功能材料制备技术领域。本发明将防水缓冲层和植物纤维发泡层用粘结层作为中间层粘合后热压,再打蜡处理表面得到防潮缓冲材料,本发明所用三甲基甲氧基硅烷中甲氧基易发生水解,会与蛋白类粘合剂中胺类物质反应生成甲基氨烷类物质,甲基氨烷类物质可与草木灰中钾离子发生取代反应,形成甲基硅酸钾,有利于提高缓冲材料的防潮性能,纸浆纤维干燥后在泡棉中膨化可以提高粘结层的缓冲性能,在拉膜过程中,液体石蜡与粘胶纤维中羟基发生交联,使胶膜的表面液体石蜡的致密性提升,阻碍纸浆纤维吸水,另外氧化钙在水和二氧化碳的环境下会形成部分碳酸钙,提高缓冲材料的使用强度,具有广阔的应用前景。(The invention particularly relates to a preparation method of a damp-proof buffer material, and belongs to the technical field of functional material preparation. The waterproof buffer layer and the plant fiber foaming layer are bonded by the bonding layer as the middle layer and then are hot-pressed, and then the surface is waxed to obtain the damp-proof buffer material, methoxy in trimethyl methoxy silane used by the invention is easy to hydrolyze and can react with amine substances in protein adhesives to generate methyl amino alkane substances, the methyl amino alkane substances can perform substitution reaction with potassium ions in plant ash to form methyl potassium silicate, the damp-proof performance of the buffer material is improved, the buffer performance of the bonding layer can be improved by swelling the pulp fiber in foam after drying, in the film drawing process, the liquid paraffin and the hydroxyl in the viscose fiber are crosslinked, so that the compactness of the liquid paraffin on the surface of the adhesive film is improved, the water absorption of the paper pulp fiber is hindered, in addition, calcium oxide can form partial calcium carbonate in the environment of water and carbon dioxide, so that the use strength of the buffer material is improved, and the buffer material has a wide application prospect.)

1. a preparation method of a damp-proof buffer material is characterized by comprising the following specific preparation steps:

(1) Putting 60-70 g of SBS rubber powder and 30-40 g of plant ash into an oven, heating, preheating for 5-7 min, putting into a rubber mixing mill, smelting to obtain a hot-melt mixture, and infiltrating the hot-melt mixture into a damp-proof buffer material to obtain a waterproof buffer layer;

(2) Bonding the waterproof buffer layer and the plant fiber foaming layer by using the bonding layer as an intermediate layer, putting the bonding layer into a hot press for hot pressing for 5-6 min, and then waxing the surface of the waterproof buffer layer to obtain the damp-proof buffer material;

The plant fiber foaming layer is prepared by the following specific steps:

mixing cationic starch and 30% polyvinyl alcohol solution in a mass ratio of 1: 2, heating to 80-90 ℃, keeping the temperature and gelatinizing for 45-50 min, cooling to room temperature, discharging to obtain a pasty substance, adding plant fibers and calcium stearate into the pasty substance, uniformly stirring, adding sodium bicarbonate, uniformly mixing, injecting into a mold, placing into a microwave reactor, performing microwave foaming for 4-5 min at a power of 800-1000W, and naturally drying to obtain a plant fiber foaming layer after molding and demolding;

the preparation steps of the bonding layer are as follows:

(1) Putting dry paper pulp into a standard dissociator, adding deionized water into the standard dissociator until the paper pulp is defibered into paper pulp suspension with the mass fraction of 5%, mixing the paper pulp suspension with hydroxymethyl cellulose, standing for 10-12 h, adding EVA (ethylene vinyl acetate) for soaking cotton, and soaking for 20-22 h to obtain a plastic base material;

(2) mixing viscose fibers and liquid paraffin, placing the mixture in a film drawing machine, drawing a film at a film drawing speed of 60-80 cm/min to obtain a glue film, placing a plastic base material in 20% by mass of lime water for soaking for 40-45 min, placing the plastic base material in an oven with a set temperature of 70-80 ℃, drying for 20-25 min to obtain a cotton-shaped waterproof base material, performing film coating treatment on the cotton-shaped waterproof base material by using the glue film, placing the cotton-shaped waterproof base material in a molding machine for hot pressing for 20-25 min, controlling the hot pressing temperature to be 100-120 ℃, and controlling the hot pressing pressure to be 0.5-0.6 MPa to obtain a bonding layer;

The preparation method of the fiber sponge plate comprises the following steps:

mixing the soybean protein powder and the sepiolite fibers, placing the mixture into a high-speed dispersion machine, dispersing the mixture at a high speed of 2000-2500 r/min for 10-15 min to obtain dispersion slurry, carrying out vacuum filtration on the dispersion slurry, removing filtrate to obtain fiber sponge, soaking the fiber sponge in acetone solution of trimethyl methoxy silane for 4-5 h, drying and pressing to obtain the fiber sponge plate.

2. The method for preparing a moisture-proof cushioning material according to claim 1, wherein: the specific preparation step (1) of the damp-proof buffer material is characterized in that the preheating temperature is controlled to be 120-130 ℃, and the set temperature of the rubber mixing machine is 160-200 ℃.

3. The method for preparing a moisture-proof cushioning material according to claim 1, wherein: the moisture-proof buffer material is prepared in the step (2) by controlling the hot-pressing pressure to be 1.20-1.25 MPa and the hot-pressing temperature to be 50-55 ℃.

4. The method for preparing a moisture-proof cushioning material according to claim 1, wherein: the plant fiber foaming layer comprises, by weight, 40-50 parts of plant fibers, 30-40 parts of calcium stearate, 80-100 parts of paste and 8-10 parts of sodium bicarbonate.

5. The method for preparing a moisture-proof cushioning material according to claim 1, wherein: in the specific preparation step of the plant fiber foaming layer, the plant fiber is one of ramie fiber, flax fiber, jute fiber or sugarcane fiber.

6. The method for preparing a moisture-proof cushioning material according to claim 1, wherein: the bonding layer is prepared from the main raw materials of the plastic base material in the step (1) in parts by weight, 50-55 parts of dry paper pulp, 25-35 parts of hydroxymethyl cellulose and 20-25 parts of EVA foam.

7. The method for preparing a moisture-proof cushioning material according to claim 1, wherein: the adhesive layer is prepared in the step (2) in a specific manner, wherein the mixing mass ratio of the viscose fibers to the liquid paraffin is 5: 1.

8. The method for preparing a moisture-proof cushioning material according to claim 1, wherein: in the preparation step of the fiber sponge plate, the mixing mass ratio of the soybean protein powder to the sepiolite fiber is 1: 5, and the mass fraction of the acetone solution of the trimethyl methoxysilane is preferably 10%.

Technical Field

The invention particularly relates to a preparation method of a damp-proof buffer material, and belongs to the technical field of functional material preparation.

Background

with the rapid development of industrial production, vibration and noise have become serious problems in various fields: the method can reduce the operation precision, influence the product quality and shorten the product service life, so that a high-precision instrument cannot normally work, the safety is threatened, and especially some electronic products bring threat to the personal safety. Therefore, the development of a cushioning material with vibration-proof and noise-reducing functions has become a major issue in the development of industries in various countries.

in the field of cushioning packaging, foamed plastic products such as EPS (polystyrene foam) have become cushioning materials widely used in recent times due to their excellent cushioning properties, shock-absorbing properties and low cost. The foamed plastic has the advantages of light weight, easy processing, good protective performance, wide adaptability, low price, good quality and the like, but also has the defects of large volume, poor high and low temperature resistance, easy aging and invalidation, no natural weathering of wastes, harmful gas generation in incineration treatment and the like. Under the conditions of serious environmental pollution and deficient natural resources, great attention is paid to the harm of the foamed plastic to the environment. Therefore, the research of replacing the foam plastic buffer material with the novel and recyclable or naturally degradable green packaging material has very important engineering application value. Paper cushioning packaging materials are one such category. The existing paper buffer packaging materials used in the market are corrugated boards, honeycomb paperboards, pulp molding and the like. Compared with plastic foam, the material is easy to degrade, but the material has the advantages of high brittleness, high weight, poor compression resilience, small buffer coefficient, high cost and large influence of environmental humidity on structural performance. In addition, a large amount of water pollution is caused in the process of manufacturing pulp, and secondary treatment is required even if waste paper is used as a raw material, so that a large amount of industrial waste water is generated, and secondary pollution is caused.

The plant fiber buffer material is developed under the condition of fully utilizing natural resources, is a novel green buffer material different from a pulp molding product and a honeycomb paperboard, takes plant fibers as main raw materials, is added with an auxiliary agent and is subjected to foaming treatment, so that a spatial three-dimensional net-shaped structure is formed inside the material, and therefore, the plant fiber buffer material has good buffer performance and ensures the structural stability of the buffer material. Such materials have been developed to date as: the crop straw cushion packaging material, the polylactic acid foaming material, the waste paper and the starch are used for preparing the foam filling for packaging. The plant fiber buffer material utilizes renewable natural resources, is an environment-friendly material which is easy to degrade and beneficial to processing and forming, and is more important to research and develop under the condition that human resources are increasingly tense.

however, the raw material sources of the plant fiber foaming buffer material are wide, and different raw materials are adopted, so that the prepared buffer material has different buffering performances, and further, the bubble nucleation rate is low and the distribution is very uneven in the forming process, and the industrial development is difficult to realize; the other is that the buffer material is of an open-pore space structure, the specific surface area is large, and the plant fiber and the starch have extremely strong hydrophilicity, so that the material is easy to absorb moisture and soften in an environment with high humidity, and the buffer performance is greatly influenced. Chinese patent publication No. CN1250066 discloses a straw fiber foaming damping buffer packaging material and a production method thereof. The packaging material adopts crushed crop straws and adhesives as raw materials, but the raw materials have poor tensile property and are easy to absorb moisture to influence the structural performance of the product. And the traditional oven is adopted for high-temperature baking and foaming, so that the heat transfer speed is low, a foaming system contains a large amount of water vapor and cannot escape in time, the foaming effect is not ideal, the most outstanding problem is that the outer surface of a sample is dried quickly, the interior is difficult to dry sufficiently, the mechanical property of the buffer material is greatly influenced, the resilience is poor, and the preparation method is only suitable for preparing the small-particle foam buffer material.

Therefore, the buffer material which has high mechanical strength, good compression resilience, difficult water absorption, environmental protection and low cost is provided, and has important significance.

Disclosure of Invention

The invention mainly solves the technical problem, and provides a preparation method of a damp-proof buffer material aiming at the defects that the existing plant fiber type buffer material has a spatial structure with openings, the specific surface area is large, and plant fibers and starch have extremely strong hydrophilicity, so that the material is easy to absorb moisture and soften in a high-humidity environment, the buffer performance is greatly influenced, and the strength of the buffer material is reduced in use.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the moisture-proof buffer material comprises the following specific preparation steps:

(1) Putting 60-70 g of SBS rubber powder and 30-40 g of plant ash into an oven, heating, preheating for 5-7 min, putting into a rubber mixing mill, smelting to obtain a hot-melt mixture, and infiltrating the hot-melt mixture into a damp-proof buffer material to obtain a waterproof buffer layer;

(2) bonding the waterproof buffer layer and the plant fiber foaming layer by using the bonding layer as an intermediate layer, putting the bonding layer into a hot press for hot pressing for 5-6 min, and then waxing the surface of the waterproof buffer layer to obtain the damp-proof buffer material;

The plant fiber foaming layer is prepared by the following specific steps:

Mixing cationic starch and 30% polyvinyl alcohol solution in a mass ratio of 1: 2, heating to 80-90 ℃, keeping the temperature and gelatinizing for 45-50 min, cooling to room temperature, discharging to obtain a pasty substance, adding plant fibers and calcium stearate into the pasty substance, uniformly stirring, adding sodium bicarbonate, uniformly mixing, injecting into a mold, placing into a microwave reactor, performing microwave foaming for 4-5 min at a power of 800-1000W, and naturally drying to obtain a plant fiber foaming layer after molding and demolding;

The preparation steps of the bonding layer are as follows:

(1) putting dry paper pulp into a standard dissociator, adding deionized water into the standard dissociator until the paper pulp is defibered into paper pulp suspension with the mass fraction of 5%, mixing the paper pulp suspension with hydroxymethyl cellulose, standing for 10-12 h, adding EVA (ethylene vinyl acetate) for soaking cotton, and soaking for 20-22 h to obtain a plastic base material;

(2) mixing viscose fibers and liquid paraffin, placing the mixture in a film drawing machine, drawing a film at a film drawing speed of 60-80 cm/min to obtain a glue film, placing a plastic base material in 20% by mass of lime water for soaking for 40-45 min, placing the plastic base material in an oven with a set temperature of 70-80 ℃, drying for 20-25 min to obtain a cotton-shaped waterproof base material, performing film coating treatment on the cotton-shaped waterproof base material by using the glue film, placing the cotton-shaped waterproof base material in a molding machine for hot pressing for 20-25 min, controlling the hot pressing temperature to be 100-120 ℃, and controlling the hot pressing pressure to be 0.5-0.6 MPa to obtain a bonding layer;

Preparing a fiber sponge board body:

Mixing the soybean protein powder and the sepiolite fibers, placing the mixture into a high-speed dispersion machine, dispersing the mixture at a high speed of 2000-2500 r/min for 10-15 min to obtain dispersion slurry, carrying out vacuum filtration on the dispersion slurry, removing filtrate to obtain fiber sponge, soaking the fiber sponge in acetone solution of trimethyl methoxy silane for 4-5 h, drying and pressing to obtain the fiber sponge plate.

the specific preparation step (1) of the damp-proof buffer material is characterized in that the preheating temperature is controlled to be 120-130 ℃, and the set temperature of the rubber mixing machine is 160-200 ℃.

The moisture-proof buffer material is prepared by controlling the hot-pressing pressure to be 1.20-1.25 MPa and the hot-pressing temperature to be 50-55 ℃ in the hot-pressing process of the hot press in the step (2).

the raw materials in the specific preparation step of the plant fiber foaming layer comprise, by weight, 40-50 parts of plant fiber, 30-40 parts of calcium stearate, 80-100 parts of paste and 8-10 parts of sodium bicarbonate.

the plant fiber in the specific preparation step of the plant fiber foaming layer is one of ramie fiber, flax fiber, jute fiber or sugarcane fiber.

The bonding layer is prepared from the main raw materials of the plastic base material in the step (1) in parts by weight, 50-55 parts of dry paper pulp, 25-35 parts of hydroxymethyl cellulose and 20-25 parts of EVA foam.

The adhesive layer is prepared in step (2) by mixing viscose fiber and liquid paraffin at a mass ratio of 5: 1.

In the preparation step of the fiber sponge plate, the mixing mass ratio of the soybean protein powder to the sepiolite fiber is 1: 5, and the mass fraction of the acetone solution of the trimethyl methoxysilane is preferably 10%.

The invention has the beneficial effects that:

(1) The invention mixes cationic starch and polyvinyl alcohol, heats and gelatinizes, adds plant fiber and calcium stearate into the gelatinized substance, injects into the mould to foam, obtains the plant fiber foaming layer, mixes the dry paper pulp after defibering in the standard dissociator with hydroxymethyl cellulose, adds EVA foam cotton, soaks to obtain the plastic base material, mixes the viscose fiber and modified emulsified liquid paraffin, draws the film to obtain the glue film, puts the plastic base material into lime water for soakage, dries, uses the glue film to coat, puts into the moulding machine for hot pressing to obtain the bonding layer, melts SBS rubber powder, flows through the wooden stone fiber sponge to obtain the waterproof buffer layer, finally uses the bonding layer as the middle layer to bond the waterproof buffer layer and the plant fiber foaming layer, hot presses, and then polishes the surface to obtain the dampproof buffer material The invention relates to a waterproof buffer layer, which comprises a bonding layer and a plant fiber foaming layer, wherein a sepiolite fiber sponge board is used as a waterproof buffer layer material, so that the affinity of the buffer material and concrete can be improved, the waterproof buffer layer material is applied to indoor decoration, and the application field of the waterproof buffer layer is enlarged, a plastic EVA foam material is used as a base material of the bonding layer, the waterproof buffer layer and the plant fiber foaming layer are bonded, so that the buffer performance can be further improved, methoxy in trimethyl methoxy silane in the bonding layer is easy to hydrolyze and can react with amine substances in a protein adhesive to generate methyl amino alkane substances, the methyl amino alkane substances can perform substitution reaction with potassium ions in plant ash serving as an additive of the waterproof buffer layer to form methyl potassium silicate, the methyl potassium silicate is a mineral waterproof agent and can react with carbon dioxide in air in humid air to form a waterproof mineral film on the surface of the waterproof buffer layer of the buffer material, the moisture resistance of the buffer material is improved;

(2) The invention uses EVA foam cotton material to obtain plastic base material by dipping paper pulp, to fill paper pulp fiber into the plastic base material, then uses lime water to dip the plastic base material, because the solidification function of the dried lime water calcium hydroxide makes the paper pulp fiber fixed in the base body, the paper pulp fiber is swelled in the foam cotton after being dried to improve the buffer performance of the bonding layer, in addition, the calcium hydroxide can generate calcium oxide after being dried and solidified, the calcium oxide can react with carbon dioxide and water in the air again to play the role of isolating gas and absorbing water, the liquid paraffin in the bonding layer has a large amount of methyl and methylene, the bond energy of which is larger and is hydrophobic group, which is beneficial to improving the waterproof performance, therefore, the adhesive film of the bonding layer is prepared by using the liquid paraffin and the viscose fiber drawing film, in the drawing film process, the liquid paraffin and the hydroxyl in the hygroscopic viscose fiber are crosslinked, to improve the compactness of the surface protection layer liquid paraffin of the adhesive, and the adhesive film is a hydrophobic protective diaphragm for the adhesive layer, so that moisture in air can be prevented from permeating into the plant fiber foaming layer, and in addition, calcium oxide can form partial calcium carbonate in the environment of water and carbon dioxide, so that the use strength of the buffer material is improved, and the adhesive film has a wide application prospect.

Detailed Description

Mixing cationic starch and a polyvinyl alcohol solution with the mass fraction of 30% according to a mass ratio of 1: 2, heating to 80-90 ℃, keeping the temperature for gelatinization for 45-50 min, cooling to room temperature, discharging to obtain a paste, adding 40-50 parts by weight of plant fiber and 30-40 parts by weight of calcium stearate into 80-100 parts by weight of the paste, uniformly stirring, adding 8-10 parts by weight of sodium bicarbonate, uniformly mixing, injecting into a mold, placing into a microwave reactor, performing microwave foaming for 4-5 min at the power of 800-1000W, and naturally drying after molding and demolding to obtain a plant fiber foaming layer, wherein the plant fiber is one of ramie fiber, flax fiber, jute fiber or sugarcane fiber; taking 50-55 parts by weight of dry paper pulp, putting the dry paper pulp into a standard dissociator, adding deionized water into the standard dissociator until the paper pulp is defibered into a paper pulp suspension liquid with the mass fraction of 5%, mixing the paper pulp suspension liquid with 25-35 parts by weight of hydroxymethyl cellulose, standing for 10-12 hours, adding 20-25 parts by weight of EVA (ethylene vinyl acetate) foam, and performing soaking treatment for 20-22 hours to obtain a plastic base material; mixing viscose fibers and liquid paraffin according to a mass ratio of 5: 1, placing the mixture in a film drawing machine, drawing a film at a film drawing speed of 60-80 cm/min to obtain a glue film, placing a plastic substrate into lime water with a mass fraction of 20% for soaking for 40-45 min, placing the plastic substrate in a drying oven with a set temperature of 70-80 ℃, drying for 20-25 min to obtain a cotton-shaped waterproof substrate, performing film coating treatment on the cotton-shaped waterproof substrate by using the glue film, placing the cotton-shaped waterproof substrate in a molding machine for hot pressing for 20-25 min, controlling the hot pressing temperature to be 100-120 ℃, and controlling the hot pressing pressure to be 0.5-0.6 MPa to obtain a bonding layer; mixing soybean protein powder and sepiolite fibers according to a mass ratio of 1: 5, placing the mixture into a high-speed dispersion machine, dispersing the mixture at a high speed of 2000-2500 r/min for 10-15 min to obtain dispersion slurry, carrying out vacuum filtration on the dispersion slurry, removing filtrate to obtain fiber sponge, soaking the fiber sponge in acetone solution of 10% by mass of trimethyl methoxysilane for 4-5 h, drying and pressing to obtain a fiber sponge plate; putting 60-70 g of SBS rubber powder and 30-40 g of plant ash into an oven, heating to 120-130 ℃, preheating for 5-7 min, putting into a rubber mixing mill with a set temperature of 160-200 ℃ for smelting to obtain a hot-melt mixture, and infiltrating the hot-melt mixture into a fiber sponge plate to obtain a waterproof buffer layer; bonding the waterproof buffer layer and the plant fiber foaming layer by using the bonding layer as an intermediate layer, putting the bonded waterproof buffer layer and the plant fiber foaming layer into a hot press for hot pressing for 5-6 min, controlling the hot pressing pressure to be 1.20-1.25 MPa and the hot pressing temperature to be 50-55 ℃, and then waxing the surface of the waterproof buffer layer to obtain the damp-proof buffer material.